Tumor radiotherapy setup errors. Medical search. Frequent questions

Despite intensive multi-modality treatment including tumor resection, post-operative radiotherapy and frequently adjuvant chemotherapy, the prognosis of malignant glioma continues to be poor. (biomedcentral.com)
All patients had received previous involved-field radiotherapy with 45 to 61 Gy and 94% of patients had been pretreated with chemotherapy, most often nimustine (ACNU) and teniposide, a combination protocol favored by the Neuro-Oncology Working Group of the German Cancer Society [ 9 ]. (biomedcentral.com)
Other clinical studies from the United States, Europe, and Asia have also influenced the treatment strategies for operable rectal cancer, as various approaches using preoperative or postoperative radiotherapy, with or without chemotherapy, have been examined. (biomedcentral.com)
increased FDG uptake may be seen in a variety of other benign conditions such as inflammation, treatment-related effects such as thymic hyperplasia after chemotherapy, sarcoid-like reaction after immunotherapy, and inflammatory response after radiotherapy. (auntminnieeurope.com)
Preparation includes correct timing of PET/CT (more than 14 days after chemotherapy and three months after radiotherapy), fasting status in FDG-PET/CT, and interventions to reduce brown fat activity and hyperglycemia in diabetic patients. (auntminnieeurope.com)
Delivering oncologically specific treatment that involves multimodality management (surgery, chemotherapy, radiotherapy), particularly in a resource-constrained community, is a significant challenge. (binayfoundation.org)
Serah Yugh had undergone eight sessions of chemotherapy, 25 rounds of radiotherapy and a single mastectomy on her left breast before realizing one shocking fact: she did not have breast cancer as misdiagnosed by the doctor! (com.ng)
She had asked them how she would cope with the side effects of the chemotherapy, radiotherapy and drugs she was taking. (com.ng)

In radiotherapy, radiation treatment planning (RTP) is the process in which a team consisting of radiation oncologists, radiation therapist, medical physicists and medical dosimetrists plan the appropriate external beam radiotherapy or internal brachytherapy treatment technique for a patient with cancer. (wikipedia.org)
We enrolled 15 patients with 17 retroperitoneal recurrent carcinomas after external beam radiotherapy (EBRT). (biomedcentral.com)
Images show initial anteroposterior (AP, left) and lateral (right) fields used for postoperative adjuvant pelvic external-beam radiotherapy in a patient with stage IC grade 2 adenocarcinoma of the endometrium who underwent hysterectomy. (medscape.com)

The X1 machine has been cleared for the delivery of stereotactic body radiotherapy (SBRT), stereotactic radiosurgery (SRS), and intensity-modulated radiotherapy (IMRT). (nvscc.com)
By comparison conventional IMRT (intensity modulated radiotherapy) treatment sessions would have taken 8-15 minutes, according to Dr. Mison Chun, chairperson of the hospital's department of radiation oncology. (hhmglobal.com)
RapidArc delivers a precise and efficient treatment in single or multiple arcs of the treatment machine around the patient and makes it possible to deliver advanced image-guided intensity modulated radiotherapy (IMRT) up to eight times faster than is possible with conventional IMRT. (hhmglobal.com)
Conventional IMRT treatments are slower and more difficult for radiotherapists because they target tumors using a complex sequence of fixed beams from multiple angles. (hhmglobal.com)
Jimmy Lee, Varian's regional sales manager, says, 'Ajou University Hospital is well known for its pioneering approach, routinely using techniques such as IMRT, image-guided radiotherapy, respiratory gating and radiosurgery in order to offer its patients the most modern treatments possible. (hhmglobal.com)
This 41-bed off-site facility has been treating up to 45 patients a day using SRS, SBRT, and IMRT for a wide range of tumors. (varian.com)
IMRT allows for the computer-controlled radiation dose to conform precisely to the shape of the tumor by modulating (adjusting) the intensity of the radiation beams. (mspca.org)
IMRT also improves the ability to conform the treatment to tumor shapes, for example when a tumor is wrapped around a vulnerable structure such as the spinal cord, a major organ, or blood vessel. (mspca.org)
Radiation therapy, including IMRT, stops cancer cells from dividing and growing, thus slowing or stopping tumor growth. (mspca.org)

Patients with Stage III NSCLC may be deemed inoperable because of patient factors (the patient's respiratory function or co-morbidities may preclude operative intervention or the patient may choose not to proceed with surgery) or tumour factors (the extent or location of gross disease might make surgical resection technically impossible, for example left sided tumours with mediastinal nodes to the right of the aorta, N3 nodal involvement and most T4 tumours). (cancer.org.au)
In addition, stereotactic radiotherapy is increasingly used for secondary management of recurrent or residual disease (ie, in patients in whom gross tumor resection is accomplished but microscopic tumor residual is specifically left on vital structures such as cranial nerves in order to minimize risk of functional deficit). (medscape.com)
Within this range, there is complex decision making to maximize safe resection whilst minimizing morbidity which depends on two main factors: tumor type (influencing propensity for recurrence, metastasis, overall survival and the need for adjuvant therapies), and tumor location (proximity to eloquent areas of brain and vital neurovascular, or neuroendocrine structures). (frontiersin.org)
Software can be used to mark out the tumor extent and a resection plan which can be used intraoperatively to navigate to the tumor. (frontiersin.org)
Tracts may be for example within tumor, abutting the tumor, or split by the tumor, which may impact the decision of both resection extent and direction of approach (Figure 1 ). (frontiersin.org)

Brain Tumor Research and Treatment, the official journal of KSNO, in April 2019. (bvsalud.org)
of tumorigenesis for some brain tumor entities, raising the However, it is a critical point that circumferences of treating possibility that such an understanding may contribute to patients with WHO grade III gliomas in Korea are much dif- new classification of these tumors [4]. (bvsalud.org)
Fifty-one adult patients with nasopharyngeal carcinoma and brain tumor were studied. (ijrr.com)

3DCRT uses MLCs to shape the radiotherapy beam to closely match the shape of a target tumour, reducing the dose to healthy surrounding tissue. (wikipedia.org)
Plans are often assessed with the aid of dose-volume histograms, allowing the clinician to evaluate the uniformity of the dose to the diseased tissue (tumor) and sparing of healthy structures. (wikipedia.org)
In forward planning, the planner places beams into a radiotherapy treatment planning system that can deliver sufficient radiation to a tumour while both sparing critical organs and minimising the dose to healthy tissue. (wikipedia.org)
Depending on the location of the tumor, the magnitude of the ITV margin extends from 1 to 3 cm, which increases substantially the volume of the irradiated normal tissue, hence resulting in an increase in normal tissue complication probability (NTCP). (korea.ac.kr)
According to RefleXion Medical, the X1 is the first machine to combine high-quality computed tomography (otherwise known as ct) scans with a linear accelerator to deliver precise radiation to a cancerous tumor while avoiding healthy tissue. (nvscc.com)
RapidArc is a very effective way of delivering advanced radiotherapy treatments to many tumors more quickly while reducing the dose to surrounding healthy tissue,' said Dr. Chun. (hhmglobal.com)
In traditional EBRT, the field or treatment area is defined by the size and shape of the collimator, and several portals or fields are used to direct the radiation beam to the tumor and the surrounding tissue. (medscape.com)
Because healthy tissues are typically more resistant to the effects of radiation, tumor cells are killed while the surrounding tissue eventually recovers. (medscape.com)
The goal of preparation is to minimize tracer uptake in normal tissue while maintaining uptake in target tumor tissue," she said. (auntminnieeurope.com)
The radiation dose intensity is elevated at the tumor, while radiation among neighboring normal tissue is decreased or avoided completely. (mspca.org)
This is a unique machine that is able to pin-point radiation directly at a tumor bypassing the normal tissue around a person's body, so they don't have all the typical side effects from radiation treatment," adds Dr. Dunlop. (cyberknifemiami.com)
2020) Proposals of models for new formulations of the current complication-free cure (P+) and uncomplicated tumor control probability (UTCP) concepts, and total normal tissue complication probability of late complications. (ijrr.com)

Although adjuvant radiotherapy is commonly used to manage advanced or metastatic cervical and endometrial cancer, it is sometimes administered as adjuvant therapy for ovarian cancer. (medscape.com)
The depth of tumoral invasion and the histopathologic grade of the tumor influence the recommendations for adjuvant postoperative therapy. (medscape.com)

Palliative radiation therapy consists of less, larger fractions of radiation therapy with the intent to alleviate pain and clinical signs associated with the tumor. (mspca.org)
CyberKnife by Accuray, also known as SBRT or Stereotactic Body Radiation Therapy is a robotic device used to treat tumors, non-invasively any where in the body, including the prostate, breast, lung, brain, spine, liver, pancreas and kidney. (cyberknifemiami.com)
Dr. Goenka is board-certified in radiation oncology and physics and has extensive experience with proton radiotherapy, intensity modulated radiation therapy, stereotactic body radiation therapy and brachytherapy applications. (connected-culture.com)

Varian Medical Systems, Inc., of Palo Alto, California, is the world's leading manufacturer of medical devices and software for treating cancer and other medical conditions with radiotherapy, radiosurgery, proton therapy, and brachytherapy. (hhmglobal.com)

Pancreatic ductal adenocarcinoma (PDAC) is characterized by a very dense and highly organized tumor microenvironment (TME) consisting of extracellular matrix (ECM) proteins, cancer-associated fibroblasts (CAFs), pancreatic stellate cells (PSCs), and immune cells. (mdpi.com)
The immunosuppressive microenvironment of solid tumors, in particular, creates a favorable niche for systemically administered bacteria to engraft and release therapeutic payloads. (nature.com)

PURPOSE: To investigate the dosimetric effects of translational and rotational patient positioning errors on the treatment of spinal and paraspinal metastases using computed tomography image-guided stereotactic body radiotherapy. (duke.edu)
To simulate the dosimetric effects of residual setup uncertainties, 36 additional plans (total, 756 plans) were generated for each isocenter (total, 21 isocenters) on the planning computed tomography images, which included isocenter lateral, anteroposterior, superoinferior shifts, and patient roll, yaw, and pitch rotations. (duke.edu)
To analyze setup deviations using daily megavoltage computed tomography (MVCT) and to evaluate three MVCT frequency reducing protocols for gynecologic cancer patients treated with helical tomotherapy. (biomedcentral.com)
Modern linear accelerator-based radiosurgical systems are now equipped with on-board computed tomography (CT) scanning capabilities to assist in the localization of tumors. (appliedradiationoncology.com)

Scholars@Duke publication: Dosimetric effect of translational and rotational errors for patients undergoing image-guided stereotactic body radiotherapy for spinal metastases. (duke.edu)
METHODS AND MATERIALS: The data from 20 patients treated for metastatic spinal cancer using image-guided stereotactic body radiotherapy were investigated in this study. (duke.edu)
Rotational correction is very important for patients with multiple targets and for the setup of paraspinal patients when the isocenter is away from bony structures. (duke.edu)
Patients should be simulated in the treatment position using an immobilisation device to ensure random and systematic set-up errors are minimised. (cancer.org.au)
We developed a simple and handy method which can reduce ITV margins in patients with moving tumors: the respiratory motion reduction device system (RMRDs). (korea.ac.kr)
Methods: The patient's clinical database was structured for moving tumor patients and patient set-up error measurement and immobilization device effects were investigated. (korea.ac.kr)
This algorithm was evaluated for 18 locally‐advanced lung cancer patients, each with 4 to 7 weekly on‐treatment CT scans having physician‐delineated gross tumor volumes (GTV). (wustl.edu)
This combination will be able to target multiple tumors at once, which will be a critical advancement in the treatment of cancer, especially for advanced-stage patients. (nvscc.com)
however, these curative treatments cannot be applied in all patients with early stage HCCs considering the baseline liver function, availability of donor organs, and tumor location. (e-cmh.org)
Korea's leading university hospital has begun treatments using a new, faster form of radiotherapy that potentially enables doctors to improve outcomes while extending modern care to more patients. (hhmglobal.com)
Hypofractionated stereotactic radiotherapy (HFSRT) is one salvage treatment option in previously irradiated patients with recurrent malignant glioma. (biomedcentral.com)
Between 1997 and 2003, 19 patients were treated with hypofractionated stereotactic radiotherapy (HFSRT) for recurrent malignant glioma at the University of Würzburg, Germany. (biomedcentral.com)
Table 1 Clinical characteristics of n = 19 consecutive patients treated with hypofractionated stereotactic radiotherapy (HFSRT) for recurrent malignant glioma. (biomedcentral.com)
Table 2 Treatment details of hypofractionated stereotactic radiotherapy (HFSRT) in n = 19 consecutive patients with recurrent malignant glioma. (biomedcentral.com)
The Varian IDENTIFY™ system is incorporated within the Varian technology portfolio and helps ensure that all patients gets the treatment meant for them-from patient check-in through setup and treatment. (varian.com)
As more and more research indicated improved patient outcomes and minimal cognitive impairment from brain SRS treatments compared to regular radiotherapy, we decided to offer our patients this type of treatment closer to home," says Dr. Calvin McAllister, radiation oncologist with Intermountain Radiation Oncology. (varian.com)
IDENTIFY has proven an important tool in our SRS program as it provides the assurance that our daily setups are accurate and that the patients are appropriately positioned for treatment. (varian.com)
In addition to the surface-guided setup, positioning, and motion monitoring features in IDENTIFY, the Welcome Desk feature is proving to be a valuable tool at the clinic for checking in patients and saving time previously spent verifying patient details. (varian.com)
Their first project involved delivering radiotherapy treatment without masks for palliative patients. (varian.com)
We consider the following scenario: A radiotherapy clinic has a limited number of proton therapy slots available each day to treat cancer patients of a given tumor site. (nsf.gov)
The clinic's goal is to minimize the expected number of complications in the cohort of all patients of that tumor site treated at the clinic, and thereby maximize the benefit of its limited proton resources. (nsf.gov)
We recorded the setup errors of 56 patients with gynecological cancer observed throughout their whole course by matching their daily MVCT with the planning CT. (biomedcentral.com)
In this study we investigated the feasibility of reducing the frequency of MVCT scans for patients with gynecological tumors by determining patient and population based systematic and random errors. (biomedcentral.com)
Pelvic radiotherapy was delivered in 48 cases, 8 patients were treated with pelvic and extended field radiotherapy because of paraaortic lymph node metastases. (biomedcentral.com)
As a result, stereotactic radiation has become a viable and useful primary management alternative for patients with cerebellopontine angle and/or skull base tumors , including acoustic neuromas (also known as vestibular schwannomas), meningiomas , and paragangliomas. (medscape.com)
Patients usually do not seek counseling until the tumors are large because small tumors cause little distress and may not be noticed by the patient. (cdc.gov)
In this video, watch as two of our patients receive an advanced form of radiotherapy. (mspca.org)
50% (N-15) of the patients had a diagnosis of oral cancer and were enrolled for tumor board discussion. (binayfoundation.org)
2019) Impact of setup and range uncertainties on TCP and NTCP following VMAT or IMPT of oropharyngeal cancer patients. (ijrr.com)
The Radiation Planning Assistant (RPA) is a system developed for the fully automated creation of radiotherapy treatment plans, including volume-modulated arc therapy (VMAT) plans for patients with head/neck cancer and 4-field box plans for patients with cervical cancer. (jove.com)
In radiotherapy clinics, the International Atomic Energy Agency (IAEA) recommends 1 treatment planner per 300 patients, and 1 radiation physicist per 400 patients treated annually 1 . (jove.com)
The 95th percentile absolute errors (e 95 ) in phantom tracking results did not exceed 1.7 mm in either imager dimension, while e 95 in the patients was 3.3 mm or less. (elsevierpure.com)
Accurate phase-binned trajectories were reconstructed in each case, with 3D maximum errors of no more than 1.0 mm in the phantoms and 2.0 mm in the patients. (elsevierpure.com)
Le protocole utilisé dans le traitement du myélome multiple a été le VMCD-REV à 76,92% avec pour réponse thérapeutique complète chez 6 patients, 3 réponses partielles et 4 en cours de traitement. (bvsalud.org)

The company supplies informatics software for managing comprehensive cancer clinics, radiotherapy centers and medical oncology practices. (hhmglobal.com)
Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology. (au.dk)
While FDG-PET/CT has been widely adopted for staging and therapy response assessment in a variety of malignant tumors, greater demand for these studies means an increasing number of radiologists -- and oncologists -- without hybrid imaging training are now involved in interpretation of PET/CT scans on tumor boards or in routine reporting of other oncology imaging such as CT and MRI. (auntminnieeurope.com)

It has been shown that, when organs at risk (OARs) are located within or near the tumor, the optimal multi-modality treatment uses protons to hypofractionate parts of the target volume and photons to achieve near-uniform fractionation in dose-limiting healthy tissues, thus exploiting the fractionation effect. (nsf.gov)

BACKGROUND/AIM: To compare heart, left ventricle (LV) and coronary artery dose-sparing with three-dimensional conformal radiotherapy (3D-CRT) vs. helical tomotherapy (HT) in left-sided breast cancer (BC). (bvsalud.org)

However, the BgRT converts that technology to treat tumors instead. (nvscc.com)

Although traditional EBRT is useful for certain tumors, in the past, results using traditional EBRT were often complicated by adverse effects associated with treatment, particularly loss of function of adjacent healthy tissues. (medscape.com)
There are certain tumors that respond better to this type of protocol. (mspca.org)

Purpose: To implement and evaluate a block matching registration (BMR) algorithm for automatic registration of locally advanced lung tumors during image‐guided radiotherapy. (wustl.edu)
Adaptive image-guided radiotherapy (IGRT) corrects for target position and volume variations, reducing the risk of biochemical failure while yielding acceptable rates of gastrointestinal (GI)/genitourinary (GU) toxicities. (urotoday.com)

However, for women with distant metastatic disease at presentation, cure is unlikely, although palliative radiotherapy frequently improves a patient's quality of life when used to relieve symptoms. (medscape.com)

Tumor location appears to be important in rectal cancer, with low-lying tumors having a greater propensity for local recurrence. (biomedcentral.com)
Postoperative radiotherapy is reserved for cases in which histopathologic analysis of the removed specimen reveals features suggesting a high risk for local recurrence. (medscape.com)

The results of this study provide guidance for the treatment planning process and recognition of the dosimetric consequences of daily patient treatment setup errors. (duke.edu)
Compared with the original plans, the daily treatment data indicated that translational adjustments could correct most of the setup errors to mean divergences of -1.4% for tumor volume coverage and -0.3% for the maximal dose to the organs at risk. (duke.edu)
Background: The internal target volume (ITV) for tumors in the abdomen or thorax includes sufficient margin for breathing-related movement of tumor volumes during treatment. (korea.ac.kr)
Radiotherapy treatment involves the delivery of high doses of radiation, targeted at a tumour, but often in close proximity to other critical organs. (physicsworld.com)
The success of the treatment depends on the precision of the dose delivery and this can be affected by a number of factors including the accuracy of the beam model, machine issues, patient setup and physical changes to the patient. (physicsworld.com)
The most simplistic use of this data is to ensure that no gross error has occurred during treatment delivery. (physicsworld.com)
Methods: Small (1 cm 3 ), non‐overlapping image sub‐volumes ("blocks") were identified on the tumor surface of the planning image (13 to 282 blocks per image) and were independently and automatically registered to the on‐treatment image using a rigid transform. (wustl.edu)
Finally, the optimal rigid transform for the on‐treatment image was extracted, providing the patient setup correction. (wustl.edu)
PURPOSE: The aim was to assess the feasibility of online adaptive radiotherapy (oART) for bladder cancer using a focal boost by focusing on the quality of the online treatment plan and automatic target delineation, duration of the workflow and performance in the presence of fiducial markers for tumor bed localization. (bvsalud.org)
CONCLUSIONS: AI-driven CBCT-guided oART aided by fiducial markers is feasible for bladder cancer radiotherapy treatment including a SIB. (bvsalud.org)
Owing to recent advances in radiotherapy techniques and radiosensitive characteristics of HCC, SBRT has shown excellent local tumor control rates as well as minimal treatment-related toxicity, especially for small (≤5 cm) HCCs that are not suitable for curative treatments [ 8 , 9 , 11 - 13 ]. (e-cmh.org)
The treatment went extremely well and it was more comfortable for the patient because she had to lie on the couch for considerably less time,' said Dr. Chun 'Faster treatments mean there is less chance for the patient to move during dose delivery, so RapidArc reduces the possibility of both set-up error and errors due to internal organ motion. (hhmglobal.com)
The system is automated within the Varian ecosystem to integrate within the standard workflow of patient identification, CT acquisition, accessory and patient setup and treatment delivery. (varian.com)
IDENTIFY helps to minimize treatment variables and reduces the opportunity for error over the course of a patient's treatment. (varian.com)
For a curative radiotherapy or chemoradiation an adequate treatment of the CTV is essential. (biomedcentral.com)
The MVCT of HT allows a daily patient setup verification and correction prior to each treatment, but the scan acquisition, matching with the KV-planning CT and patient repositioning takes significant additional time, depending on the image scan length. (biomedcentral.com)
it provides a basic introduction of the technology available, the applications in the management of acoustic neuromas (including the role of the neurotologist/ neurosurgeon in treatment planning), and the controversies regarding the use of radiation for the management of these tumors. (medscape.com)
Furthermore, specialized collimators and treatment plans have been developed for a variety of unusual and rare tumors. (medscape.com)
Furthermore, even when standardized treatment is used and tumors are at the same stage and have similar histologic features, it is difficult to predict the outcome. (cdc.gov)
Radiotherapy definition: related originally to radioactive iodine treatments for thyroid cancer - Most cancer radiotherapy disrupts cellular division (clonogenicity) - Radioablative treatment ALSO disrupts cellular function - Stop production of thyroid hormone - Would have same effect on tumor hormone (e.g. (studyres.com)
It is a combination of specially developed in-house software that uses an application programming interface to communicate with a commercial radiotherapy treatment planning system. (jove.com)
The RPA then generates a complete radiotherapy treatment plan. (jove.com)
The test was to be given before radiotherapy since it determined the next steps of treatment. (com.ng)
This has to be balanced with post-operative plans for further oncological treatment, and the natural history of the tumor in question. (frontiersin.org)
The ability to reconstruct the tumor's average trajectory from a 3D cone-beam CT scan on the day of treatment could allow for better patient setup and quality assurance, while direct tumor tracking in rotational projections could be clinically useful for rotational therapy such as volumetric modulated arc therapy (VMAT). (elsevierpure.com)

Radiotherapy treatments are planned on computers using a combination of a machine beam model and a scanned patient geometry. (physicsworld.com)
Combining these developments may reduce the side effects of radiation treatments by helping doctors locate a tumor, reduce setup errors, and avoid healthy tissues. (nvscc.com)

They also delineate the gross tumor volume. (jove.com)

Conclusion: BMR is a promising approach for automatic lung tumor localization. (wustl.edu)
Fiducial markers were visible on the CBCTs and aided the tumor localization. (bvsalud.org)
The quality of the adaptive plans met the clinical requirements and fiducial markers were visible enabling consistent daily tumor localization. (bvsalud.org)

Stereotactic radiotherapy allows dynamic beam shaping and intensity modulation, providing flexibility and optimal tumor dosing. (medscape.com)

Furthermore, some tumors were said to be resistant to radiation, often because of dose limitations of the surrounding or adjacent tissues. (medscape.com)
Today, through the use of sophisticated imaging devices and 3-dimensional treatmentplanning computers, stereotactic radiotherapy allows much more specific targeting of a lesion, with significantly less radiation delivered to surrounding healthy tissues. (medscape.com)
However, such payloads can be harmful if released outside the tumor in healthy tissues where the bacteria also engraft in smaller numbers. (nature.com)
The current study performed differentially expressed analyses between normal tissues and tumor tissues. (biomedcentral.com)

In inverse planning a radiation oncologist defines a patient's critical organs and tumour, after which a planner gives target doses and importance factors for each. (wikipedia.org)

2020) Radiobiological modeling of acute esophagitis following radiotherapy of thorax and head-neck tumors: A comparison of lyman kutcher burman with equivalent uniform dose-based models. (ijrr.com)
Uneétude descriptive, transversale portant sur les patientes traitées en radiothérapie à l'Hôpital Général de Douala pour cancer du col de l'utérus a été réalisée d'octobre 2020 à janvier 2021.Résultats. (bvsalud.org)
A descriptive cross over study of women treated by radiotherapy at the Douala General Hospital from October 2020 to January 2021 was conducted. (bvsalud.org)
Il s'agissait d'une étude rétrospective descriptive d'une durée de 2 ans 3 mois allant du 1er janvier 2018 au 31 Mars 2020 portant sur 80 dossiers de malades porteurs d'hémopathies malignes et prise en charge dans le centre. (bvsalud.org)

Tumor volume coverage and the maximal dose to the organs at risk were compared with those of the original plan. (duke.edu)
The dose distribution in the patient is dependent on the anatomy and beam modifiers such as wedges, specialized collimation, field sizes, tumor depth, etc. (wikipedia.org)
The bladder and pelvic lymph nodes received a total dose of 40 Gy in 20 fractions, the tumor received an additional simultaneously integrated boost (SIB) of 15 Gy. (bvsalud.org)
The median interval from post-operative radiotherapy to HFSRT was 19 (range 3-116) months, the median daily single dose 5 (4-10) Gy, the median total dose 30 (20-30) Gy and the median planning target volume 15 (4-70) ml. (biomedcentral.com)
Stereotactic radiotherapy is the term used to define the method of delivery of a precise dose of high-energy radiation through stereotactically directed narrow beams. (medscape.com)

All other malignant gliomas including WHO sified anaplastic astrocytoma, anaplastic oligodendroglioma, grade II and III gliomas are composed of 10.2% of all prima- ry CNS tumors in the United State [1] and 5.3% in Korea [2]. (bvsalud.org)
Malignant melanoma is an example of such a tumor. (mspca.org)

These plans may be sensitive to range and setup errors, especially misalignments between proton and photon doses. (nsf.gov)
As a consequence, much higher doses can be delivered accurately to the tumor, resulting in greater control and cure rates and decreased complications. (medscape.com)
The net effect is that radiation doses can be "wrapped" around tumors, or "painted" within tumors, far more precisely than was previously possible. (mspca.org)
The accumulation of small daily doses damages rapidly proliferating tumors more than organs at risk (OARs). (appliedradiationoncology.com)

Histological tumor grade is prognostic, with poorly differentiated tumors having a worse prognosis. (biomedcentral.com)
E-mail: [email protected] according to molecular and histological features of tumors. (bvsalud.org)

This type of planning is only sufficiently adept to handle relatively simple cases in which the tumour has a simple shape and is not near any critical organs. (wikipedia.org)

Revised August 22, 2019 system tumor in Korea in the past. (bvsalud.org)
2019) Modern radiotherapy for head and neck cancer. (ijrr.com)

FDG-PET/CT showed asymmetric strong FDG uptake in the left vocal cord due to right recurrent laryngeal nerve palsy from prior surgery and tumor involvement. (auntminnieeurope.com)

In addition, tumour motion is not uniform in three dimensions and the degree of movement may be dependent upon the location of the tumour in the lungs and on the compliance of the thorax and lung parenchyma. (cancer.org.au)

CT attenuation correction, performed in PET/CT to improve diagnosis, is prone to several errors due to methodological shortcomings associated with segmentation scaling methods and also CT transmission measurements, he explained. (auntminnieeurope.com)
Their aim is to support families in the North East who, like them, are dealing with a brain tumour diagnosis. (brainstrust.org.uk)
Following clinical and radiological diagnosis, the surgical management of pediatric brain tumors involves tumor biopsy, tumor excision, and the management of perioperative surgical complications including CSF diversion. (frontiersin.org)

The introduction of HPV vaccines has also drawn more attention to the fact that HPV is associated not only with cervical cancer and genital warts but also with other tumors, such as head neck and anogenital cancers ( 3 ). (cdc.gov)

The mucinous variety can be visualized via magnetic resonance imaging (MRI) defined by greater than 50% mucin in the tumor, and this variety has recently been shown to respond less favorably to neoadjuvant chemoradiation. (biomedcentral.com)
Grade 2 and 3 tumors consist of 6-50% and greater than 50% solid growth, respectively. (medscape.com)

abstract = "Algorithms for direct tumor tracking in rotational cone-beam projections and for reconstruction of phase-binned 3D tumor trajectories were developed. (elsevierpure.com)

The 36-year-old was later diagnosed with cancer and offered either a full mastectomy or a lumpectomy, and radiotherapy, on the NHS. (scienceblogs.com)

Pelvic radiotherapy is associated with both an overall higher setup uncertainty in patient positioning and uncertainties due to potential internal organ motion (e.g. uterus, rectum, prostate), thus necessitating wide PTV margins. (biomedcentral.com)

1995). A Method of Head Immobilization for Frameless Fractionated Stereotactic Radiotherapy . (queensu.ca)

It can be deduced that LKB and log-logistic methods make reliable estimations for NTCP of the pituitary gland after radiotherapy. (ijrr.com)

In short, MRI techniques & radiologist expertise have evolved such that preoperative prediction of not only the tumor histology but also molecular subgroup is increasingly accurate ( 1 , 2 ). (frontiersin.org)

setup errors calculated using these 5 or 10 early MVCT scans with the actual errors found with the remaining fractions to to analyze the residual deviations. (biomedcentral.com)

With RapidArc, Varian's Clinac® accelerator can target beams at a tumor while continuously rotating around the patient. (hhmglobal.com)
Median survival in these series was between 7 and 13 months from the time of salvage radiotherapy suggesting a therapeutic benefit in selected patient groups. (biomedcentral.com)
Since Varian's release of the latest version of IDENTIFY earlier this year, a number of clinics in the USA and Europe have adopted the system for patient identification and setup, accessory positioning, and motion monitoring. (varian.com)
Plus, we're learning a lot about why our patient setups may not match the images, for instance, we've noticed that IDENTIFY couch values in setup are sometimes more accurate than tattoos. (varian.com)
Systematic and random errors were calculated on a patient and population basis. (biomedcentral.com)
Nguyen D. AlignRT with Halcyon: From Patient Setup to Monitoring. (visionrt.com)
Its missile guided technology follows the tumor even as the patient moves or breathes naturally," explains Dr. Dunlop. (cyberknifemiami.com)
Patient-specific confidence-limited planning target volumes (cl-PTV) were then constructed, reducing the standard PTV and compensating for geometric variation of the target and setup errors. (urotoday.com)

I tell people that when you breathe, your heart moves, your lungs move, and tumors move, so this machine can uniquely track the movement of tumors in someone's body. (cyberknifemiami.com)

Anatomy1

Analytical, Diagnostic and Therapeutic Techniques and Equipment19

Information Science4

Health Care2

Chemotherapy8

External beam radioth3

IMRT9

Resection5

Brain Tumor3

Tissue12

Adjuvant2

Radiation therapy3

Radiosurgery1

Microenvironment2

Computed tomography4

Patients34

Oncology3

Multi-modality treatment1

Helical tomotherapy1

Treat tumors1

Certain tumors2

Image-guided2

Palliative1

Local recurrence2

Treatment25

Treatments2

Gross1

Localization3

Intensity1

Tissues4

Patient's1

20204

Dose5

Malignant2

Doses4

Histological2

Critical organs1

20192

Recurrent1

Thorax1

Diagnosis3

Head neck1

Greater than 502

Abstract1

Mastectomy1

Pelvic1

Immobilization1

Pituitary1

Preoperative1

Fractions1

Patient8

Lungs1