Measurement tomography. Medical search. Frequent questions

We hypothesized that three-dimensional models created from cone-beam computed tomography (CBCT) scans could be used to calculate bone volume changes following maxillary sinus lift procedures. (umich.edu)
To identify the average number of dental implants that can be placed in the lower anterior region to support a fixed mandibular prosthesis based on the distance between the mental foramina, using a cone beam computed tomography (CBCT) scan through a new method of measurement. (bvsalud.org)

To report the frequency and severity of optical coherence tomography (OCT) retinal thickness measurement errors and to describe parameters that predict these errors. (nih.gov)
Background/aims To assess the reproducibility and repeatability of foveal avascular zone (FAZ) area measurements using optical coherence tomography angiography (OCT-A) in healthy subjects. (bmj.com)
We advance studies of subretinal treatments by developing a microscope-integrated optical coherence tomography (MIOCT) image-based method for measuring the volume of therapeutics delivered into the subretinal space. (arvojournals.org)
Association between Optical Coherence Tomography Measurements and Clinical Parameters in Idiopathic Intracranial Hypertension. (bvsalud.org)
To correlate optical coherence tomography (OCT) measurements with clinical parameters in idiopathic intracranial hypertension (IIH). (bvsalud.org)
SIGNIFICANCE: High density diffuse optical tomography (HD-DOT) as applied in functional near-infrared spectroscopy (fNIRS) is largely limited to continuous wave (CW) data. (birmingham.ac.uk)
Slit-lamp microscopy, corneal topography, and optical coherence tomography were performed for the clinical examination of the patient's eye. (molvis.org)
PURPOSE: To evaluate optical coherence tomography (OCT) in the measurement of donor corneas in preparation for endothelial keratoplasty. (elsevierpure.com)
To compare the central corneal thickness (CCT),minimum corneal thickness (MCT) and corneal power measured using theScheimpflug-Placido device and optical coherence tomography (OCT) in healthy eyes. (org.pk)
CCT and MCT measurements were carried out using spectral-domain optical coherence tomography (Optovue) and a Scheimpflug-Placido topographer (Sirius).The agreement between the two approaches was assessed using Bland-Altman analysis in this study. (org.pk)
Corneal Parameters Measurement in Healthy Subjects Using Scheimpflug and Anterior Segment Optical Coherence Tomography: Doi: 10.36351/pjo.v39i4.1666. (org.pk)
We present in vivo normal human volumetric retinal flow measurement using Fourier domain Doppler optical coherence tomography. (elsevierpure.com)
In this way, the multiparameter estimation problem in fluorescent tomography is transformed into two independent single-coefficient determined schemes of diffusion optical tomography (DOT). (hindawi.com)
Non-invasive measurements of breast tissue optical properties using frequency-domain photon migration," Philosophical Transactions of the Royal Society of London Series B Biological Sciences , vol. 352, no. 1354, pp. 661-668, 1997. (hindawi.com)
Recent literature on multiple sclerosis (MS) demonstrates the growing implementation of optical coherence tomography-angiography (OCT-A) to discover potential qualitative and quantitative changes in the retina and optic nerve. (biomedcentral.com)
Optical coherence tomography (OCT), which uses low-coherence light to capture cross-sectional and high-resolution images from the retinal and choroidal layers, has been broadly employed [ 16 ]. (biomedcentral.com)

A variety of imaging modalities, including structural and functional magnetic resonance imaging (MRI) and positron emission tomography (PET) studies of cerebral metabolism, have shown characteristic changes in the brain of patients with Alzheimer disease in prodromal and even presymptomatic states. (medscape.com)
Second-tier imaging with molecular methods, preferably with fluorodeoxyglucose positron emission tomography (FDG-PET) (or single-photon emission CT [SPECT] if PET is unavailable), can provide greater diagnostic specificity. (medscape.com)
Positron emission tomography (PET) using F-18-3'-deoxy-3'-fluorothymidine ([F-18]FLT) allows noninvasive monitoring of tumour proliferation. (amsterdamumc.org)

ABSTRACT This cross-sectional study of 1283 healthy children (681 boys, 602 girls) aged 6-11 years tested the degree of correlation between waist circumference measurements and adiposity. (who.int)

Methods Sixty healthy volunteers (60 eyes) were subjected to FAZ area measurements by means of high speed and high resolution spectral-domain OCT (SD-OCT) XR Avanti with the split-spectrum amplitude decorrelation angiography algorithm by two experienced examiners in two different sessions. (bmj.com)
A software platform was developed for the joint evaluation, display, and fusion of data from the non-destructive testing methods of computed tomography (CT), ultrasonics and thermography. (fraunhofer.de)
Structural anisotropy of two-phase materials can be evaluated through global measurements, as volume orientation or mean-intercept length methods do, or through statistics performed on a set of individual measurements. (enea.it)
Experimentally soil, fabric can be quantified by non-destructive methods such as image microscopy and X-ray computed tomography. (researchgate.net)
non-destructive methods such as image microscopy and X-ray computed tomography. (researchgate.net)

X-ray micro-tomography (XMT) is increasingly used for the quantitative analysis of the volumes of features within the 3D images. (strath.ac.uk)
Some structural and hydrodynamic properties of a flat rectangular sheet (0.4x0.4x 0.02 m 3 ) of RCM-NCX-1116, a Ni-Cr metallic foam manufactured by Recemat International B.V. (The Netherlands) are investigated using X-ray radiography at 420 kV and X-ray micro tomography at 100 kV. (isipt.org)

Since its development in the 1950s, muon tomography has taken many forms, the most important of which are muon transmission radiography and muon scattering tomography. (wikipedia.org)

Physiological Measurement. (wikipedia.org)
Physiological Measurement 2016;37(6):727-750. (ge.com)
Physiological Measurement 2016;37(6):938-950. (ge.com)

Ultrasonic measurement of velocity through the bone has also been used to determine bone density. (medscape.com)
It is a sensitive technique and can detect changes in bone density only 6-12 months after a previous measurement is obtained. (medscape.com)
Density measurements of the spine or hip are used. (medscape.com)
The second experiment entails the direct measurement of the Dirac distribution (a phase-space quasi-probability distribution informationally equivalent to the density matrix), demonstrating that the direct measurement procedure is applicable to general (that is, potentially mixed) quantum states. (nature.com)
Kohda, E & Shigematsu, N 1989, ' Measurement of Lung Density by Computed Tomography: Implication for Radiotherapy ', the keio journal of medicine , vol. 38, no. 4, pp. 454-463. (elsevierpure.com)
Nodule morphometric measurements (maximum and mean diameter, volume, mass, density) and total nodule count per scan irrespective of size were automatically generated by the CIRRUS software. (diagnijmegen.nl)
S. R. Arridge and M. Schweiger, "Photon-measurement density functions. (hindawi.com)
This systematic review and meta-analysis of the studies reporting OCT-A measurements of people with MS confirmed the tendency of MS eyes to exhibit reduced vessel density in the macular and optic disc areas, mainly in SCP, DCP, and RPC vessel densities. (biomedcentral.com)

Lung volumes derived from computed tomography (CT) scans can include estimates of abnormal lung tissue volumes, in addition to normal lung tissue volumes and the volume of gas within the lungs. (ersjournals.com)
Numerous studies are under way to identify specific imaging markers for different types of dementia, including cerebral volumetric measurements, diffusion imaging, spectroscopy, very-high-field MRI scans of senile plaques, and PET scan markers of senile plaques. (medscape.com)
The doctor may also use imaging studies including x-rays, computerized tomography (CT) scans, or magnetic resonance imaging (MRI) to see structures inside the body. (medlineplus.gov)

One of the problems in Electrical Impedance Tomography (EIT) is the ill-possed problem occurred in the reconstruction process. (omicsonline.org)
Absolute Conductivity Reconstruction in Magnetic Induction Tomography Using a Nonlinear Method" (PDF). (wikipedia.org)
The method to measure the space between the foramina was developed using the BlueSky Plan3 software in Dicom format and the axial reconstruction views were chosen for measurements. (bvsalud.org)

The aim of this study was to investigate the measurements of the mandibular canal in different patterns of reabsorbed alveolar ridges, using multidetector computed tomography in order to evaluate the relationship of the mandibular canal with the cortex of the mandible remains. (bvsalud.org)
Central cross-sectional slice of 30 edentulous alveolar ridges in the mandibular first molar region of otherwise healthy patients using multidetector computed tomography were analyzed. (bvsalud.org)

There are few morphobiometric reports on these rings in different Testudines species, and we performed ultrasound (US) and computed tomography (CT) of the scleral ossicle rings in one green turtle (Chelonia mydas), one black-bellied slider (Trachemys dorbigni) and one red-footed tortoise (Chelonoidis carbonarius). (scielo.br)

Thereafter, comparative 3D volumetric measurements of the syndesmotic joint were also calculated: (1) from the tibial plafond extending until 3 cm proximally, (2) 5 cm proximally, and (3) 10 cm proximally. (nih.gov)
Volumetric measurements of the right ventricle are helpful in patients with atrial septal defects (ASDs) in estimating the degree of right ventricular (RV) failure. (elsevierpure.com)

A MIOCT image-based volume measurement method was developed and assessed for accuracy and reproducibility by imaging an object of known size in model eyes. (arvojournals.org)
Validation of the image-based volume measurement method showed accuracy to ±1.0 μL (6.0% of measured volume) with no statistically significant variation under different imaging settings. (arvojournals.org)
Magnetic induction tomography is an imaging technique used to image electromagnetic properties of an object by using the eddy current effect. (wikipedia.org)
Structural imaging, preferably with MRI when possible and with computed tomography (CT) when not, should be performed as a first-tier approach. (medscape.com)
We show that combining CW and FD measurements and multiple modulation frequencies increases imaging performance in fNIRS. (birmingham.ac.uk)
Measured values on 3D and 2-dimensional imaging using a conventional CT scanner may slightly underestimate true measurements. (beaumont.org)
Electrical Impedance Tomography (EIT) is an imaging technology that uses the electrical properties within an anatomic structure derived from measurements made on the structure's surface. (ge.com)
Traditional imaging modalities used to obtain such measurements have had limitations in measuring the complex shape of the right ventricle. (elsevierpure.com)
Benign bone lesions may be incidentally detected on radiographs and are increasingly found on computed tomography (CT) or magnetic resonance imaging (MRI) performed for other clinical indications. (medscape.com)
increased uptake was seen on single-photon emission computed tomography (SPECT) imaging but not on conventional planar imaging. (medscape.com)

Bone microarchitecture of the distal non-dominant radius and tibia was measured by high-resolution peripheral quantitative computed tomography (HR-pQCT). (frontiersin.org)
The purpose of the present study was to evaluate the reproducibility of quantitative [F-18]FLT measurements. (amsterdamumc.org)
Quantitative [F-18]FLT measurements are reproducible in both NSCLC and HNC patients. (amsterdamumc.org)
PubMed and EMBASE were systematically searched to identify articles that applied OCT-A to evaluate the retinal microvasculature measurements in patients with MS. Quantitative data synthesis was performed on all measurements which were evaluated in at least two unique studies with the same OCT-A devices, software, and study population compared to controls. (biomedcentral.com)

The objectives of the study were to compare the measurements from human skulls and their images from cephalometric radiographs and computed tomography (CT) scanograms in order to gauge the potential use of CT in routine clinical practice. (apospublications.com)

This especially holds for the quantum values that prevail between two measurements. (nature.com)
In standard quantum theory, where only measurement makes a value valid, such "unmeasured values" seem to be meaningless. (nature.com)
Historically, determination of the quantum state has been performed indirectly through the use of tomography. (nature.com)
Our work has applications to measurements in foundational quantum mechanics, quantum information and quantum metrology. (nature.com)
Resch, K. J., Walther, P. & Zeilinger, A. Full characterization of a three-photon Greenberger-Horne-Zeilinger state using quantum state tomography. (nature.com)
Lundeen, J. S. & Bamber, C. Procedure for direct measurement of general quantum states using weak measurement. (nature.com)
Leonhardt, U. Quantum-state tomography and discrete Wigner function. (nature.com)
With reference to question on how to do quantum tomography on two qubits , I would like to ask you for help again. (stackexchange.com)
Measurements that occur within the internal layers of a quantum circuit-midcircuit measurements-are a useful quantum-computing primitive, most notably for quantum error correction. (sandia.gov)
Midcircuit measurements have both classical and quantum outputs, so they can be subject to error modes that do not exist for measurements that terminate quantum circuits. (sandia.gov)
Here we show how to characterize midcircuit measurements, modeled by quantum instruments, using a technique that we call quantum instrument linear gate set tomography (QILGST). (sandia.gov)

The vertical diffusion of NaI solution from a horizontal fracture into and within the surrounding matrix was tracked and quantified over time using an artificially fractured chalk core (30×5 cm) and a second-generation X-ray computed tomography (CT) scanner. (huji.ac.il)

CONCLUSIONS: The donor corneal measurements by OCT were not as predictable as those by USP. (elsevierpure.com)

Errors of retinal boundary detection and thickness measurement were observed in 92% of eyes, but were severe in only 13.5% of eyes. (nih.gov)
Retinal thickness measurement errors occur frequently with current OCT segmentation and analysis algorithms. (nih.gov)
We believe this is the first demonstration of total retinal blood flow measurement using the OCT technique. (elsevierpure.com)

Conclusions FAZ area measurements by means of OCT-A showed excellent reproducibility and repeatability in healthy eyes. (bmj.com)
CONCLUSIONS: We show that combining CW and FD measurements offers better performance than FD alone, with higher modulation frequencies increasing accuracy. (birmingham.ac.uk)

X-ray scattering tensor tomography provides 3D directional information on unresolved microstructures in large volumes, facilitating the investigation of the microstructural organization in statistically large enough sample portions. (lu.se)
In this Letter, a rapid x-ray scattering tensor tomography acquisition method is proposed. (lu.se)
The main advantage of the presented method is the reduced data acquisition time compared to the existing protocols for x-ray scattering tensor tomography, paving the way toward rapid time-resolved studies. (lu.se)

Objective: The aims of this study were to compare opening and closing angles of normally functioning mechanical aortic valves measured on dual-source computed tomography (CT) with the manufacturers' values and to compare CT-measured opening angles according to valve function. (elsevierpure.com)

This last procedure is encouraged by recent improvements in the spatial resolution of conventional X-ray tomography. (enea.it)
Multislice computed tomography (MSCT) is a technique that provides excellent spatial resolution of the moving heart. (elsevierpure.com)

E. L. Hull, M. G. Nichols, and T. H. Foster, "Localization of luminescent inhomogeneities in turbid media with spatially resolved measurements of cw diffuse luminescence emittance," Applied Optics , vol. 37, no. 13, pp. 2755-2765, 1998. (hindawi.com)

On WBCT scan, 2D measurements of the syndesmosis joint were first measured 1 cm above the joint line in the axial plane via syndesmotic area and distances between the anterior, middle, and posterior quadrants. (nih.gov)
Recently, eddy current sensors has been used to scan additive manufacturing for metal process layer-by-layer, producing eddy current tomography images. (wikipedia.org)

Measurements of absolute lung volumes, residual volume (RV), functional residual capacity (FRC) and total lung capacity (TLC) are technically more challenging, which limits their use in clinical practice. (ersjournals.com)
The role of lung volume measurements in the assessment of disease severity, functional disability, course of disease and response to treatment remains to be determined in infants, as well as in children and adults. (ersjournals.com)
Nevertheless, in particular circumstances, measurements of lung volume are strictly necessary for a correct physiological diagnosis 1 . (ersjournals.com)
In contrast to the relative simplicity of spirometric volumes, a variety of disparate techniques have been developed for the measurement of absolute lung volumes. (ersjournals.com)

As the systematic error in a measurement cannot be eliminated by combining the results from multiple measurements, this paper introduces a procedure for using volume standards to reduce the systematic error, especially for smaller objects where the relative error is larger. (strath.ac.uk)

Rayapudi N, Challa P, Gandikota CS, Yudhistar PV, Tircoveluri S. A comparative study of linear measurements of facial skeleton using computed tomography and traditional cephalometry. (apospublications.com)

There is a sity (whether total or central), and to quan- suggestion that waist circumference alone tify the association of waist circumference may be a more useful and accurate tool in measurements with age and degree of BMI children than DXA etc. [ 6 ]. (who.int)
A geneticist will do a thorough physical examination that may include measurements such as the distance around the head (head circumference), the distance between the eyes, and the length of the arms and legs. (medlineplus.gov)

However, established acquisition protocols such as scanning small angle x-ray scattering and x-ray grating interferometry require long measurement time. (lu.se)

We hypothesized that WBCT volumetric measurement of the distal syndesmosis would be increased on the injured as compared to the contralateral uninjured side and that these 3-dimensional (3D) calculations would be a more sensitive determinant than 2-dimensional (2D) methodology among patients with syndesmotic instability. (nih.gov)
MRI can be considered the preferred neuroimaging examination for Alzheimer disease because it allows accurate measurement of the 3-dimensional (3D) volume of brain structures, especially the size of the hippocampus and related regions. (medscape.com)
Three-Dimensional Computed Tomography Measurement Accuracy of Varying " by Anthony Ho, Michael D Kurdziel et al. (beaumont.org)
Three-Dimensional Computed Tomography Measurement Accuracy of Varying Hill-Sachs Lesion Size. (beaumont.org)
This study aimed to assess the accuracy and reliability of measuring Hill-Sachs lesion sizes using 3-dimensional (3D) computed tomography (CT). (beaumont.org)
Muon tomography or muography is a technique that uses cosmic ray muons to generate two or three-dimensional images of volumes using information contained in the Coulomb scattering of the muons. (wikipedia.org)

The results of the present study show that the measurements for dental implant placement in the posterior region of the mandible are affected by the different patterns of bone resorptions. (bvsalud.org)

Currently, DEXA is the most accurate and recommended method for BMD measurement. (medscape.com)
however, no measurement method has been universally accepted. (beaumont.org)
Computed tomography (CT) scanning is an effective method for detecting regional and distant metastasis from thyroid cancer. (medscape.com)

Objective -To describe the anatomic features of the pituitary gland region in horses via computed tomography (CT) and determine the accuracy of CT for estimating normal equine pituitary gland dimensions. (avma.org)

The interclass correlation coefficient evaluated interobserver and intraobserver variability and percentage error, and Student t-tests assessed measurement accuracy. (beaumont.org)
However, degree of correlation between waist circum- studies on the efficacy of anthropometric ference measurements of a sample of techniques for identifying children with Egyptian schoolchildren with their adipo- high central adiposity are scare. (who.int)

Estimates of height and volume from all CT techniques differed from gross measurements. (avma.org)
The systematic error is the offset between the actual and measured volume which is consistent between different measurements and can therefore be eliminated by appropriate calibration. (strath.ac.uk)

The coefficient of repeatability average measurements of FAZ area were 0.015 mm 2 and 0.013 mm 2 for the first and second observers, respectively. (bmj.com)

Electrical resistivity tomography (ERT) has been widely used to map the ice-containing permafrost by its resistivity contrast compared to the surrounding unfrozen medium. (copernicus.org)
Pigatto A.V., Kao T-J, Mueller J. L. Mueller, Baker C. D., DeBoer E. M. Kupfer O., Electrical impedance tomography detects changes in ventilation after airway clearance in spinal muscular atrophy type I, Respiratory Physiology & Neurobiology 2021 (pending). (ge.com)
Detection of small bleeds in the brain with electrical impedance tomography. (ge.com)

Anatomy24

Organisms3

Diseases19

Chemicals and Drugs27

Analytical, Diagnostic and Therapeutic Techniques and Equipment134

Psychiatry and Psychology2

Phenomena and Processes40

Disciplines and Occupations7

Technology, Industry, Agriculture4

Information Science15

Named Groups1

Health Care40

Cone-Beam Computed Tomography2

Optical16

Positron emission t3

Abstract1

Methods5

Micro-tomography2

Radiography1

Physiological Measurement3

Density8

Scans3

Reconstruction3

Multidetector2

Ultrasound1

Volumetric measurements2

Imaging10

Quantitative4

Radiographs1

Quantum11

Diffusion1

Corneal1

Retinal3

Conclusions2

Tensor3

Aortic1

Spatial resolution2

Diffuse1

Scan2

Lung4

Procedure1

Comparative study1

Circumference2

Interferometry1

Dimensional6

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Method3

Anatomic1

Correlation2

Volume2

Coefficient1

Electrical3