PubMed journal article: Computer-aided polyp detection on CT colonography: comparison of three systems in a high-risk human population. Download Prime PubMed App to iPhone, iPad, or Android
October 15, 2012 -- The European Society of Gastrointestinal and Abdominal Radiology (ESGAR) has published its first update on CT colonography (CTC) guidelines since 2007. Its working group on CTC has endorsed 86 statements, reaching near-complete agreement on 71 of the 86 items relating to critical practice areas affecting CTC.. Agreement was most consistent in the areas of colon distension, scan parameters, use of intravenous contrast agents, patient preparation, and the role of computer-aided detection (CAD) and lesion measurement. Less than unanimous accord was seen in the use of spasmolytics, decubitus positioning and the number of CT data acquisitions, fecal tagging, 2D versus 3D reading, and reporting.. Over the last five years, expansion of the CT colonography literature has continued and several important studies, including multicenter studies, have been published, wrote Dr. Emanuele Neri and colleagues from six EU countries on behalf of the ESGAR CTC working group. These new data ...
We read with interest the article by Ginnerup Pedersen et al (Gut 2003;52:1744-7) investigating the frequency and diagnostic consequences of extracolonic findings at multidetector computed tomography (MDCT) colonography.. The authors noted extracolonic findings in 65% of cases, with the need for further workup in 12% and surgery in 3%. The authors concluded that the high prevalence of extracolonic findings may make MDCT colonography a problematic colorectal cancer screening tool for both ethical and economic reasons.. We would like to comment on the question raised by Ginnerup Pedersen et al-namely, whether MDCT colonography should be regarded as a colon examination or a sort of Pandoras box (if used for abdominal screening).. Notably, a recent article has emphasised that one of the major potential advantages of MDCT colonography in comparison with all other existing colorectal diagnostic tests is its ability to detect disease outside the colon.1 Indeed, the possibility that extracolonic ...
The team compared primary computed tomographic colonography screening in 3120 consecutive adults with primary optical colonoscopy screening in 3163 consecutive adults.. The main outcome measures included the detection of advanced neoplasia, and the total number of harvested polyps.. Referral for polypectomy during optical colonoscopy was offered for all computed tomographic colonography-detected polyps of at least 6 mm in size.. Patients with 1 or 2 small polyps also were offered the option of computed tomographic colonography surveillance.. During primary optical colonoscopy, nearly all detected polyps were removed, regardless of size, according to established practice guidelines.. The researchers found 123 advanced neoplasms including 14 invasive cancers during computed tomographic colonography.. Optical colonoscopy screening identified 121 advanced neoplasms including 4 invasive cancers.. The researchers noted that the referral rate for optical colonoscopy in the primary computed tomographic ...
CT colonography has been developed as a less invasive alternative to colonoscopy to decrease perforation-related morbidity and mortality and potentially to increase population adherence with colorectal cancer screening. However, we demonstrate that primary screening with CT colonography is more expensive and leads to more overall deaths than colonoscopy. Our conclusions are sensitive to CT colonographys test performance characteristics, the malignancy risk of missed adenomas, the perforation risk and perforation-related mortality estimates for colonoscopy, the procedural costs, and differences in screening adherence.. It is difficult to know what the test performance characteristics of CT colonography will ultimately be in routine clinical practice. However, even if they rival those of colonoscopy, we have shown that the cost of a CT colonography strategy prohibits recommending it as a primary method for colorectal cancer screening. Even in the best-case scenario, the cost per life-year gained ...
TY - JOUR. T1 - CT colonography with intravenous contrast material. T2 - Varied appearances of colorectal carcinoma. AU - Silva, Alvin C. AU - Hara, Amy K.. AU - Leighton, Jonathan A. AU - Heppell, Jacques P.. PY - 2005/9. Y1 - 2005/9. N2 - Computed tomographic (CT) colonography is a noninvasive, rapidly evolving technique that has been shown in some studies to be comparable with conventional colonoscopy for the screening of colorectal cancer. Because colorectal cancer has a widely varying appearance at both endoscopy and CT colonography, familiarity with the gamut of morphologic appearances can help improve interpretation of the results. The addition of intravenous contrast material to CT colonography can aid differentiation of true colonic masses from pseudolesions such as residual stool and improves the depiction of enhancing masses that might otherwise be obscured by residual colonic fluid. In contrast to staging of most other tumors, staging of colorectal carcinoma depends more on the depth ...
TY - JOUR. T1 - The future of colorectal imaging. T2 - Computed tomographic colonography. AU - Hara, Amy K.. PY - 2002/12/1. Y1 - 2002/12/1. N2 - The development of colorectal cancer screening alternatives that are attractive to patients and effective for screening is critical for reducing this too-common and deadly disease. CTC is an exciting technique that is the only imaging alternative developed since the barium enema for colon screening. In the past few years, many obstacles to clinical implementation of CTC have been eliminated. For example, there is no longer any post-processing time, which was previously as long as 8 to 10 hours, and the interpretation time has been drastically reduced from 4 hours to 15 to 20 minutes. The majority of studies have demonstrated excellent results for detection of lesions ≥1 cm., with few false positives. This examination will continue to improve with the development of automated (computer) detection programs and automated 3D rendering algorithms. In ...
RATIONALE: New diagnostic procedures such as computed tomographic colonography may improve the ability to detect colorectal cancer and may provide a les
The purpose of this paper was to investigate the effect of radiologist experience and increasing exposure to CT colonography on reader performance. Three radiologists of differing general experience (consultant, research fellow, trainee) independently analysed 100 CT colonographic datasets. Readers had no prior experience of CT colonography and received feedback and training after the first 50 cases from an independent experienced radiologist. Diagnostic performance and reporting times were compared for the first and second 50 datasets and compared with the results of a radiologist experienced in CT colonography. Before training only the consultant reader achieved statistical equivalence with the reference standard for detection of larger polyps. After training, detection rates ranged between 25 and 58% for larger polyps. Only the trainee significantly improved after training ( P=0.007), with performance of other readers unchanged or even worse. Reporting times following training were reduced ...
Ill refer to the article in Radiology, Volume 247, where they use gentle laxative and Dulcolax tablets as the laxative in bowel preparation. The second is a noncathartic CT colonography where they did not use laxative. Again reported in AJR 2008. So lets go through one at a time. The study that used limited bowel preparation for CT colonography, they used low fiber diet for two days, and patients did not take any oral laxative except for Dulcolax tablets. And they were given two doses. The patients given high density barium over a certain time period, and they were also given Telebrix as the agent to tag the liquid that may be left behind. So this is just to show you a summary of what theyd done in terms of the fecal tagging agents and the laxative. The results showed the patients who had polyps more than 10 mm or larger, with limited bowel preparation, the sensitivity was very good, 82%. Again, just to show you an image that they showed in the article, they showed large volume of stool in ...
INTRODUCTION. Computed tomography colonography (CTC), or virtual colonoscopy, is an imaging method based on the acquisition of multiple sections obtained by multidetector computed tomography (MDCT), generating sectional views of the colon that later can be reformatted in multiple planes and also processed in to allow endoluminal navigation, as in optical colonoscopy (OC)(1) . Among its main advantages, this method is fast, as the examination is performed in less than 15 minutes, without requiring sedation. For over a decade, CTC has been utilized in the investigation of colonic polyps and colorectal cancer (CRC). Developments in the clinical and epidemiological knowledge on CRC and the many technological advances incorporated by CTC have transformed the method from an investigation tool into a viable option for CRC screening(2 4) .. The method is less invasive than OC for the screening of polyps and may preferably be utilized in asymptomatic individuals with low risk for development of CRC, in ...
Colorectal cancer is the second leading cause of cancer death in the United States and fourth worldwide. Colorectal cancer often develops from precancerous polyps which, when found early, may be easily and safely removed. Colorectal polyps are often asymptomatic and are typically detected through routine optical colonoscopy (OC) screening. While there have been many advancements in polyp detection and OC, roughly 22% of polyps still go undetected during an OC screen and 4-6% of diagnosed colorectal cancers are thought to have been missed on prior colonoscopies. Because the incidence and mortality of colorectal cancer decreases with early detection, it is important to reduce the rates of undetected polyps. Researchers at Arizona State University in collaboration with Dr. Gurudu of the Mayo Clinic have developed two novel systems for computer-aided detection of polyps in optical colonoscopy images. The first system detects polyps by using boundary classifiers and a voting scheme to automatically ...
Discusses virtual colonoscopy (computed tomographic colonography). Covers why and how it is done. Explains how it differs from a regular colonoscopy. Covers things to think about when choosing virtual colonoscopy.
Virtual colonoscopy (VC) is a noninvasive method for colonic polyp screening, by reconstructing three-dimensional models of the colon using computerized tomography (CT). In virtual colonoscopy fly-through navigation, it is crucial to generate an optimal camera path for efficient clinical examination. In conventional methods, the centerline of the colon lumen is usually used as the camera path. In order to extract colon centerline, some time consuming pre-processing algorithms must be performed before the fly-through navigation, such as colon segmentation, distance transformation, or topological thinning. In this paper, we present an efficient image-based path planning algorithm for automated virtual colonoscopy fly-through navigation without the requirement of any pre-processing. Our algorithm only needs the physician to provide a seed point as the starting camera position using 2D axial CT images. A wide angle fisheye camera model is used to generate a depth image from the current camera ...
As Americans celebrate National Colorectal Cancer Awareness Month, the Colon Cancer Alliance, COLONTOWN-a survivor/patient support group for colorectal disease, including cancer-and the American College of Radiology call on Congress to pass the CT Colonography Screening for Colorectal Cancer Act (H.R. 991). Introduced recently by Representatives Ralph Hall (R-TX) and Danny Davis (D-IL), H.R. 991 would require Medicare to cover beneficiaries for CT colonography (virtual colonoscopy).. Colorectal cancer is the third leading cause of death from cancer in the United States. However, thousands of Americans, particularly minorities, who are at risk for developing the disease, forgo screening every year. Increasing screening compliance is vitally important in the fight against colorectal cancer, and virtual colonoscopy can attract those who cant or wont choose other forms of screening. I urge Congress to act now and support passage of H.R. 991, said Andrew Spiegel, Chief Executive Officer of the ...
The study by Rockey et al prospectively evaluated ACBE, CTC, and colonoscopy for the diagnosis of colonic neoplasia in high risk patients. The study showed the accuracy of colonoscopy to be higher than that of ACBE or CTC. Overall, the study was well designed and well done. All investigators were adequately trained to do the tests being evaluated. Each test was interpreted blind, with segmental unblinding during the colonoscopy and independent blinded review of discordant results on any of the 3 tests. All tests were repeated in the event of continued disagreement. This rigorous method minimises bias in favour of colonoscopy.. The study has 2 limitations. Firstly, no barium stool tagging was used for CTC. Because colonic lesions can be obscured by untagged fluid and stool, this lowers the accuracy of CTC. Secondly, the Vitrea software used in the study has limited 3 dimensional reconstruction, with lower resolution for polyp conspicuity and less similarity to optical colonoscopy than the ...
Potentially precancerous polyps detected with CT colonography (CTC) need to be removed subsequently, using an optical colonoscope (OC). Due to large colonic deformations induced by the colonoscope, even very experienced colonoscopists find it difficult to pinpoint the exact location of the colonoscope tip in relation to polyps reported on CTC. This can cause unduly prolonged OC examinations that are stressful for the patient, colonoscopist and supporting staff. We developed a method, based on monocular 3D reconstruction from OC images, that automatically matches polyps observed in OC with polyps reported on prior CTC. A matching cost is computed, using rigid point-based registration between surface point clouds extracted from both modalities. A 3D printed and painted phantom of a 25 cm long transverse colon segment was used to validate the method on two medium sized polyps. Results indicate that the matching cost is smaller at the correct corresponding polyp between OC and CTC: the value is 3.9 ...
Ultrasound is often the first line of imaging used to investigate SH.1, 2, 5Although operator dependent, it can be used to make a diagnosis of SH in a large proportion of patients. In addition, a Valsalva manoeuvre can be used in supine and erect sonography to determine the presence of SH.3. There is a slightly higher incidence of SH in women than in men; in adults, it usually occurs during the fourth and seventh decades.1, 2, 6It may occur on either side of the body, or occasionally bilaterally.1There are several known predisposing factors: obesity, chronic obstructive airways disease, previous surgery or laparoscopy, peritoneal dialysis, multiple pregnancies, and rapid weight loss, for example.2, 6, 7. Clinical presentation varies, depending on the content of the hernial sac. In obese individuals, detection of SH may be particularly difficult as the hernia may not be palpable on clinical examination. Some patients may complain of pain, but no lump is palpable.6Omentum and/or segments of the ...
Virtual colonoscopy. Discover more here from Bupa about what a virtual colonoscopy is and why its used, for example, to check for polyps or bowel cancer.
For colorectal cancer screening, does computed tomography have a cost advantage relative to optical colonoscopy for the commercially insured U.S. population?
According to the up-to-date statistics from American Cancer Society [ 1 ], colon and rectum cancer ranks the third most common occurrence of both
The use of CT colonography (CTC) as both a diagnostic and screening examination for colon cancer is steadily increasing. It also is valuable as a prognostic ...
The most renowned CT Colonography course in Europe, imitated by many. The only course where workstations of several vendors are simultaneously available. Initiated in 2003, it underwent numerous complete revolutions in teaching approach, trying to improve the educational needs of the attendees. In order to maximize time devoted to hands-on training, another major change was implemented starting in 2016, i.e., the combination of the on-site workshop with webinars. Most of the lectures will be available on the ESGAR website for reviewing before the workshop, leaving more time for on-site case-based training. Televoting is further implemented for a more interactive experience of the attendees ...
Learn more about CT Colonography at Portsmouth Regional Hospital DefinitionReasons for TestPossible ComplicationsWhat to ExpectCall Your Doctorrevision ...
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CT virtual colonoscopy with the use of a three-dimensional approach is an accurate screening method for the detection of colorectal neoplasia in asymptomatic average-risk adults and compares favorably with optical colonoscopy in terms of the detection of clinically relevant lesions.
Health, ...Providing computed tomography colonography (CTC) otherwise known as v...CRC is the second leading cause of cancer in the U.S. While colonosco...The study performed at the National Naval Medical Center in Bethesda... Had CTC not been an available option 91 of the 250 patients would h...,Virtual,colonoscopy,option,could,improve,colorectal,cancer,screening,rates,,patient,survey,suggests,medicine,medical news today,latest medical news,medical newsletters,current medical news,latest medicine news
PURPOSE: To prospectively evaluate the effects of z-axis spatial resolution and tube current on the sensitivity of a commercially available computed tomographic (CT) colonography computer-aided diagnosis (CAD) system for polyp detection by using pig colon phantoms. MATERIALS AND METHODS: Ninety-six polyps were created and analyzed in 14 pig colon phantoms. CT colonography was performed by using a 16-detector CT scanner at 0.75-mm collimation; 10, 50, 100, and 160 mAs; and a pitch of 1.5. At each milliampere-second setting, the CT images were reconstructed with a section thickness (ST) of 1.5 mm and a reconstruction increment (RI) of 1.3 mm. To evaluate the effect of z-axis spatial resolution, CT images were also reconstructed at 100 mAs with various SI and RI combinations (respectively: 1.0 and 0.7 mm, 3.0 and 2.0 mm, 3.0 and 3.0 mm, 5.0 and 5.0 mm). The phantom data were then analyzed by using a CAD program. CAD performance with different CT parameters was calculated and compared in terms of ...
Computed Tomography (CT or CAT scan) is an imaging method that uses x-rays to create pictures of cross-sections of the body.. Electron-beam computed tomography (EBCT) is a test that looks for specks of calcium (called calcifications) in the walls of the coronary arteries.. Magnetic resonance imaging (MRI) uses a large magnet and radio waves to look at organs and structures inside the body.. Magnetic Resonance Angiography (MRA) is a non-invasive technique MRI technique used to diagnose blood vessel patency or blood flow abnormalities.. Multidetector CT (MDCT) scans take images of the beating heart, and show calcium and blockages in the heart arteries.. PET (Positron Emission Tomography) produces high energy, 3-D computer-reconstructed images measuring and determining the function or physiology in a specific organ, tumor, or other metabolically active site.. Virtual colonoscopy (VC) (or Computerized Tomographic Colonography (CTC) uses x rays and computers to produce two- and three-dimensional ...
June 20, 2008 - iCAD Inc. said it has initiated a clinical study for Colon CAD, its virtual colonoscopy CAD product, in partnership with ACR Image Metrix, a subsidiary of the American College of Radiology (ACR).. iCAD and ACR Image Metrix, having completed the development portion of the study, are collaborating on study execution including a multi-reader, multi-case (MRMC) clinical study designed to assess the impact of Colon CAD on the accuracy of interpreting CT Colonography exams also known as virtual colonoscopies. The study will also assess the sensitivity of Colon CAD for detecting polyps and will measure the impact of iCADs CT Colon CAD product on interpretation and workflow.. Virtual colonoscopy offers patients a less invasive option to conventional colonic polyp detection techniques. According to the company, reviewing these images can be tedious and challenging because of the amount of information captured in a CT exam. ICADs colon CAD product uses sophisticated image processing ...
A model predicting complications for colorectal screening options found a greater risk of cancer deaths and procedure-related deaths in virtual colonoscopy as compared to traditional colonoscopy.
An online colonoscopy is definitely an outpatient procedure, but its usually performed inside a hospital.. You will not be looked into in to the hospital and may leave within 24 hours because the test. You will not be sedated either.. The exam takes about ten to fifteen minutes to accomplish. The testing process is really as follows:. If you are getting a CT virtual colonoscopy, you might be requested to consume a liquid contrast agent. In some instances, you might go ahead and take contrast in pill form in your own home.. A skinny, flexible tube is going to be put into your rectum.. For CT procedures, room air or co2 is gradually pumped in to the tube to inflate your rectum and permit for closer examination.. For MRI exams, a contrast agent thats given rectally can be used to enlarge the region.. The table youre laying on will slide in to the CT or MRI machine. Your physician may request you to hold your breath for any couple of moments to get a stable image.. Youll have a minimum of 2 ...
Virtual Colonoscopy, CT exam for detecting polyps and cancer in the colon, Suburban Imaging, board-certified radiologists, radiology centers in Twin Cities Metro Area, Blaine, Maple Grove, Edina, Southdale, Coon Rapids, Minnesota
Virtual colonoscopy (VC) is an imaging or x-ray test that looks for cancer, polyps, or other disease in the large intestine (colon). Learn more about this test.
Question - Painful bowel movements, blood in stools. Virtual colonoscopy recommended. Other options?. Ask a Doctor about diagnosis, treatment and medication for Hemorrhoid, Ask a Gastroenterologist
CT Imaging and Medical Imaging protocols, teaching files, images, lectures, podcasts, vodcasts, 3D CTA cases and Atlas, CT scanning.|CTisus
Doctors give unbiased, helpful information on indications, contra-indications, benefits, and complications: Dr. Tisdale on virtual colonoscopy accuracy: If you are talking about a groin hernia, the answer is no.
Browse the archive of Virtual Colonoscopy Software market reports and research in the United States, European, Asia-Pacific, and Latin American regions.
https://www.immersivecomputinglab.org/wp-content/uploads/2021/01/nyu-logo-1.jpg 0 0 Academic Web Pages https://www.immersivecomputinglab.org/wp-content/uploads/2021/01/nyu-logo-1.jpg Academic Web Pages2014-11-09 14:28:492021-01-31 07:44:58Benefits of 3D Immersion for Virtual Colonoscopy - Article link ...
Care guide for Virtual Colonoscopy (Precare). Includes: possible causes, signs and symptoms, standard treatment options and means of care and support.
Care guide for Virtual Colonoscopy (Aftercare Instructions). Includes: possible causes, signs and symptoms, standard treatment options and means of care and support.
A machine learning algorithm helps accurately differentiate benign and premalignant colorectal polyps on CT colonography scans, according to a study publishe
BALTIMORE -- CT colonography for colorectal cancer screening will not be covered under Medicare, the Centers for Medicare and Medicaid Services has confirmed.
syngo Colonography CT is a clinical application dedicated for noninvasive evaluation of the entire colon based on low-dose, high-resolution spiral CT scans.
CTC suffers from errors due to imperfect cleansing of the colon. Retained fluid and stool in the colon lumen hides the colon wall, thus degrades polyp detection performance, manual or computer aided. The standard practice against this is to scan the patient twice, in prone and in supine positions and examine the two sets of data in practice. This requires accurate registration of the datasets. Due to the extreme flexibility of the colon wall, this problem has proven to be very difficult. As a first step towards full registration and as a practical solution to the problem, we have considered to register the central axes of the supine and prone colons. Thus, the MDs will be able to accurately locate themselves in parallel in both datasets along the central axes. This will provide a practical and easy way to confirm polyp detections on two datasets. This study is an improvement over our previously proposed algorithm (RSNA2001 & EMBC2001). Here, we used Dynamic Time Warping algorithm where the time ...
Results: Tagging was optimal in 95.3% of the cases, and reader confidence was high. Sensitivities were 64.1%-66.7% (for the 2 readers) for 5- to 9-mm polyps and 91.7% for larger polyps. The overall specificity was 94.2% and 95%. Sensitivity improved during the study for both 5- to 9-mm polyps (from 54.2%-58.3% to 80%) and polyps larger than 9 mm (from 50% to 100%). Specificity changed nonuniformly ...
The standard on patient information and consent sets out the following minimum acceptable practice and best practice which are still relevant today [6]. • The process of providing patient information must follow an established pathway. • If using local information leaflets, they must comply with national standards. • The writing of information leaflets must be carried out in liaison with patient/service user advisory groups. • National Patient Safety Guidelines (NPSA) must be followed during the prescribing of laxatives for bowel preparation. A narrow window width results in a high con- -1000 HU air trast image. 4. A CT image contains a wide range of X-ray attenuation values, converted into Hounsfield units. But the eye cannot visualise so many grades of signal within the associated greyscale. Thus, the range of tissue attenuations to be visualised on a CT image is narrowed down to a window width of values, centred around an attenuation value which is called the window level. Typical ...
Hi! It was suggested that I start a new thread on this topic so that my post would not be lost. So glad I found this discussion board. History: I have had several bouts of IBS iover my adult life. Typical symtoms - bloating, occassional cramping, sometimes diarrhea and sometimes constipation, noisy GI tract, etc. but never any evidence of blood. Diet seems to be the main contributor. If I stick with lean proteins, fresh fruits & veggies, minimize processed foods, the symptoms go away. Starting several months ago, the symptoms returned. Over the past year, I started taking canned soup to work for lunch, added a snack almost every day from the vending machine, and my husband began relying on making a pasta dish for dinner several times a week.. In others words, a big increase in processed foods. I went to my primary care doctor as the symptoms seemed more extreme than what I remember from about 10 years ago. She suggested the Stanford FODMAP diet, which is basically gluten-free, lactose-free, ...
Hi! It was suggested that I start a new thread on this topic so that my post would not be lost. So glad I found this discussion board. History: I have had several bouts of IBS iover my adult life. Typical symtoms - bloating, occassional cramping, sometimes diarrhea and sometimes constipation, noisy GI tract, etc. but never any evidence of blood. Diet seems to be the main contributor. If I stick with lean proteins, fresh fruits & veggies, minimize processed foods, the symptoms go away. Starting several months ago, the symptoms returned. Over the past year, I started taking canned soup to work for lunch, added a snack almost every day from the vending machine, and my husband began relying on making a pasta dish for dinner several times a week.. In others words, a big increase in processed foods. I went to my primary care doctor as the symptoms seemed more extreme than what I remember from about 10 years ago. She suggested the Stanford FODMAP diet, which is basically gluten-free, lactose-free, ...