Patient-bounded extrapolation using low-dose priors for volume
... (Received 2 September 2014; revised 29 November 2014; accepted for publication 11 December 2014; published 20 March 2015) Purpose: Three-dimensional (3D) volume-of-interest (VOI) imaging with C-arm systems provides anatomical information in a predefined 3D target region at a considerably low x-ray d ...
... (Received 2 September 2014; revised 29 November 2014; accepted for publication 11 December 2014; published 20 March 2015) Purpose: Three-dimensional (3D) volume-of-interest (VOI) imaging with C-arm systems provides anatomical information in a predefined 3D target region at a considerably low x-ray d ...
Enlarged Lymph Nodes of the Neck
... false-negative lymph nodes, and 3 patients with both false-positive and false-negative lymph nodes. The number and location of falsely diagnosed nodes in parallel-scanned EFOV-US sequences are listed in Table 2. The majority of false-negative nodes were located cranial to the carotid bifurcation. Re ...
... false-negative lymph nodes, and 3 patients with both false-positive and false-negative lymph nodes. The number and location of falsely diagnosed nodes in parallel-scanned EFOV-US sequences are listed in Table 2. The majority of false-negative nodes were located cranial to the carotid bifurcation. Re ...
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... • Cardiac MRI provides unrivaled cardiac imaging quality • A complete non-invasive cardiac anatomic and physiologic evaluation can be accomplished • Anesthesia is needed for infants and children but can be accomplished with rare adverse events ...
... • Cardiac MRI provides unrivaled cardiac imaging quality • A complete non-invasive cardiac anatomic and physiologic evaluation can be accomplished • Anesthesia is needed for infants and children but can be accomplished with rare adverse events ...
Equilibrium-Phase High Spatial Resolution Contrast
... magnetic resonance angiography (CE-MRA) at 1.5T using a blood pool contrast agent for the preoperative evaluation of deep inferior epigastric artery perforator branches (DIEP), and (ii) to compare image quality with conventional first-pass CEMRA. Methods: Twenty-three consecutive patients were inclu ...
... magnetic resonance angiography (CE-MRA) at 1.5T using a blood pool contrast agent for the preoperative evaluation of deep inferior epigastric artery perforator branches (DIEP), and (ii) to compare image quality with conventional first-pass CEMRA. Methods: Twenty-three consecutive patients were inclu ...
Sternoclavicular Joint: MR Imaging-Anatomic
... joint are mare, and only infrequently is it injured in sports and accidents. The stemnoclavicular joint can be affected, however, infections ...
... joint are mare, and only infrequently is it injured in sports and accidents. The stemnoclavicular joint can be affected, however, infections ...
SPECT in Acute Pulmonary Embolism
... Collart et al. showed the same sensitivity with SPECT perfusion imaging and planar V/Q imaging, 12 of 15 (80%), but showed a higher specificity with SPECT perfusion imaging, 49 of 51 (96%), than with planar V/Q imaging, 40 of 51 (78%) (20). The diagnosis of PE on SPECT was based on visualization of ...
... Collart et al. showed the same sensitivity with SPECT perfusion imaging and planar V/Q imaging, 12 of 15 (80%), but showed a higher specificity with SPECT perfusion imaging, 49 of 51 (96%), than with planar V/Q imaging, 40 of 51 (78%) (20). The diagnosis of PE on SPECT was based on visualization of ...
SBRT: AAPM Task Group 101 Report
... potential inaccurate dose computation due to: 1. Use of conditions that require extrapolation of data beyond measurement range 2. Use of large grid size resulting in unexpected results for small structures Recommendation (TG 101): SBRT commonly includes extremely high-dose gradients near the bound ...
... potential inaccurate dose computation due to: 1. Use of conditions that require extrapolation of data beyond measurement range 2. Use of large grid size resulting in unexpected results for small structures Recommendation (TG 101): SBRT commonly includes extremely high-dose gradients near the bound ...
ACR–NASCI–SPR Practice Parameter
... American Society for Cardiovascular Imaging (NASCI), and the Society for Pediatric Radiology (SPR). Magnetic resonance angiography (MRA) is a proven and useful tool for the evaluation, assessment of severity, and follow-up of diseases of the vascular system. Contrast-enhanced magnetic resonance angi ...
... American Society for Cardiovascular Imaging (NASCI), and the Society for Pediatric Radiology (SPR). Magnetic resonance angiography (MRA) is a proven and useful tool for the evaluation, assessment of severity, and follow-up of diseases of the vascular system. Contrast-enhanced magnetic resonance angi ...
Brain perfusion imaging: How does it work and what should I use?
... response to therapy. Multi-institutional efforts such as ...
... response to therapy. Multi-institutional efforts such as ...
Cone beam computed tomography functionalities in dentistry
... bone tissues.”[103] While MRI is recommended for evaluation of TMJ soft tissues, CBCT has lower radiation dose. However, it is emphasized that CBCT technique, unlike CT and MRI, does not reveal the details of soft tissues. The aforementioned advantages made the CBCT the best imaging tool for incurre ...
... bone tissues.”[103] While MRI is recommended for evaluation of TMJ soft tissues, CBCT has lower radiation dose. However, it is emphasized that CBCT technique, unlike CT and MRI, does not reveal the details of soft tissues. The aforementioned advantages made the CBCT the best imaging tool for incurre ...
The Clinical Value of Diffusion-Weighted Imaging in Combination
... problems in odds calculations for studies with sensitivities or specificities of 100%. Positive and negative likelihood ratios (LRs) were derived as functions of these summary estimates. We also used the derived estimates of sensitivity, specificity, and respective variances to construct a summary r ...
... problems in odds calculations for studies with sensitivities or specificities of 100%. Positive and negative likelihood ratios (LRs) were derived as functions of these summary estimates. We also used the derived estimates of sensitivity, specificity, and respective variances to construct a summary r ...
Magnetic resonance imaging in canine spontaneous - E
... with the permission of the Faculty of Veterinary Medicine, for public criticism in Auditorium Maximum, Hämeentie 57, 00580 Helsinki on the 13 th of June 2000 at 12 o´clock. ...
... with the permission of the Faculty of Veterinary Medicine, for public criticism in Auditorium Maximum, Hämeentie 57, 00580 Helsinki on the 13 th of June 2000 at 12 o´clock. ...
Perfusion and vascular permeability: Basic concepts and
... Techniques to analyse the tissue microcirculation were originally developed in physiology [16—18] and nuclear medicine [19,20] and then, in the early 1980s, it was shown, based on the work of Meier and Zierler [21], that computed tomography (CT) could be used to study the microcirculation during the ...
... Techniques to analyse the tissue microcirculation were originally developed in physiology [16—18] and nuclear medicine [19,20] and then, in the early 1980s, it was shown, based on the work of Meier and Zierler [21], that computed tomography (CT) could be used to study the microcirculation during the ...
Patch based Reconstruction Of Under-sampled Data
... the particular balance chosen between undersampling artifacts, signal to noise ratio (SNR), volume coverage, spatial resolution and temporal fidelity. TRACER (13), a nonlinear parallel imaging reconstruction (14) of golden ratio ordered variable density spiral acquisition, allows the reconstruction ...
... the particular balance chosen between undersampling artifacts, signal to noise ratio (SNR), volume coverage, spatial resolution and temporal fidelity. TRACER (13), a nonlinear parallel imaging reconstruction (14) of golden ratio ordered variable density spiral acquisition, allows the reconstruction ...
Magnetic resonance imaging and ultrasound in hepatosplenic
... accentuation of periportal signal in T2-weighted sequences, and hypointense signal in relation to the normal liver parenchyma in T1weighted sequences with fat suppression. T1-weighted sequences showed accentuation of periportal signal after contrast administration. It has been suggested that the hyp ...
... accentuation of periportal signal in T2-weighted sequences, and hypointense signal in relation to the normal liver parenchyma in T1weighted sequences with fat suppression. T1-weighted sequences showed accentuation of periportal signal after contrast administration. It has been suggested that the hyp ...
Diffusion-weighted imaging (DWI) in musculoskeletal MRI: a critical
... Magnetic resonance imaging (MRI) is the mainstay of diagnosis, staging and follow-up of many musculoskeletal disorders. Conventional spin-echo, proton density and short tau inversion recovery (STIR) MRI sequences rely on the differing T1 and T2 relaxation characteristics of various pathological proc ...
... Magnetic resonance imaging (MRI) is the mainstay of diagnosis, staging and follow-up of many musculoskeletal disorders. Conventional spin-echo, proton density and short tau inversion recovery (STIR) MRI sequences rely on the differing T1 and T2 relaxation characteristics of various pathological proc ...
Principles of CT: Multislice CT
... z-direction and provide all submillimeter detector elements: 64 · 0.625 mm (total z-axis length of 40 mm) for the Philips and GE Healthcare models and 64 · 0.5 mm (total z-axis length of 32 mm) for the Toshiba model. The design approach of Siemens was quite different. The detector array of the Sieme ...
... z-direction and provide all submillimeter detector elements: 64 · 0.625 mm (total z-axis length of 40 mm) for the Philips and GE Healthcare models and 64 · 0.5 mm (total z-axis length of 32 mm) for the Toshiba model. The design approach of Siemens was quite different. The detector array of the Sieme ...
Digital radiography with large-area flat
... CCD by some kind of optics reducing the size of the image. This demagnifying system can consist of lenses or optical fibres, and sometimes an image intensifier is used. Whereas CCDs are very sensitive detector systems, any of these optical systems reduces the number of photons that reaches the CCD, ...
... CCD by some kind of optics reducing the size of the image. This demagnifying system can consist of lenses or optical fibres, and sometimes an image intensifier is used. Whereas CCDs are very sensitive detector systems, any of these optical systems reduces the number of photons that reaches the CCD, ...
Garba_Idris_MASTERS
... Aim: The aim of this study was to record the values of CTDIw and DLP displayed on the Computed Tomography (CT) scanner monitors of patients undergoing CT examinations of the head as Diagnostic Reference Levels (DRL) for dose optimisation in Northern Nigeria. Background: A brain CT scan is the most c ...
... Aim: The aim of this study was to record the values of CTDIw and DLP displayed on the Computed Tomography (CT) scanner monitors of patients undergoing CT examinations of the head as Diagnostic Reference Levels (DRL) for dose optimisation in Northern Nigeria. Background: A brain CT scan is the most c ...
Radiation Oncology Error Management
... Most of the LINACs are inspected and governed by the state government !! ...
... Most of the LINACs are inspected and governed by the state government !! ...
Ultrasound - Scrotum
... diagnose results of trauma to the scrotal area. diagnose causes of testicular pain or swelling such as inflammation or torsion. evaluate the cause of infertility such as varicocele. look for the location of undescended testis. A sudden onset of pain in the scrotum should be taken very seriously. The ...
... diagnose results of trauma to the scrotal area. diagnose causes of testicular pain or swelling such as inflammation or torsion. evaluate the cause of infertility such as varicocele. look for the location of undescended testis. A sudden onset of pain in the scrotum should be taken very seriously. The ...
report in pdf
... The tongue constitutes a unique anatomical structure among all the organs integrating the human body. It is a specialized organ located in the oral cavity, which plays an important role in respiration, mastication, deglutition, speech production of humans, and also suction in children. The ability o ...
... The tongue constitutes a unique anatomical structure among all the organs integrating the human body. It is a specialized organ located in the oral cavity, which plays an important role in respiration, mastication, deglutition, speech production of humans, and also suction in children. The ability o ...
SMALL ANIMAL RADIoGRAPHY - Saint Francis Veterinary Center
... Making the Move to Digital RaDiogRaphy Have you asked yourself, “Should I make the move to digital radiography?” It’s a question that most practices have considered by now. Fellow practitioners with digital radiography (DR) and digital equipment manufacturers will tell you the benefits are substanti ...
... Making the Move to Digital RaDiogRaphy Have you asked yourself, “Should I make the move to digital radiography?” It’s a question that most practices have considered by now. Fellow practitioners with digital radiography (DR) and digital equipment manufacturers will tell you the benefits are substanti ...
Infimal Convolution of Total Generalized Variation Functionals for
... This way of combining two convex functionals is well-known in convex analysis and is called infimal-convolution due to analogy to the convolution operation in Fourier analysis. A main advantage of this approach is that it allows for a local, adaptive decomposition of the dataset into two image compo ...
... This way of combining two convex functionals is well-known in convex analysis and is called infimal-convolution due to analogy to the convolution operation in Fourier analysis. A main advantage of this approach is that it allows for a local, adaptive decomposition of the dataset into two image compo ...
Imaging techniques in electrophysiology
... ventricular tachycradia (VT), this number decreases to 9%. Fusion of EAM data with cardiac CT and/or MRI, however, is performed in up to 43% of AF ablation procedures. During catheter ablation for VT, the use of EAM is widespread: in ischaemic and dilated cardiomyopathy it is used in 88% of cases, a ...
... ventricular tachycradia (VT), this number decreases to 9%. Fusion of EAM data with cardiac CT and/or MRI, however, is performed in up to 43% of AF ablation procedures. During catheter ablation for VT, the use of EAM is widespread: in ischaemic and dilated cardiomyopathy it is used in 88% of cases, a ...
Positron emission tomography
Positron emission tomography (PET) is a nuclear medicine, functional imaging technique that produces a three-dimensional image of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule. Three-dimensional images of tracer concentration within the body are then constructed by computer analysis. In modern PET-CT scanners, three dimensional imaging is often accomplished with the aid of a CT X-ray scan performed on the patient during the same session, in the same machine.If the biologically active molecule chosen for PET is fluorodeoxyglucose (FDG), an analogue of glucose, the concentrations of tracer imaged will indicate tissue metabolic activity as it corresponds to the regional glucose uptake. Use of this tracer to explore the possibility of cancer metastasis (i.e., spreading to other sites) is the most common type of PET scan in standard medical care (90% of current scans). However, on a minority basis, many other radioactive tracers are used in PET to image the tissue concentration of other types of molecules of interest. One of the disadvantages of PET scanners is their operating cost.