ICRP PUBLICATION 121: Radiological Protection in Paediatric
... not sufficiently efficacious, is contrary to good medical practice and not sound radiological protection. Justification is also a key principle in medical exposures. Publication 105 describes three levels of justification, one of which is justification of individual exposures. This is particularly importan ...
... not sufficiently efficacious, is contrary to good medical practice and not sound radiological protection. Justification is also a key principle in medical exposures. Publication 105 describes three levels of justification, one of which is justification of individual exposures. This is particularly importan ...
Manchester Grand Hyatt | San Diego
... The meeting offers 54.75 AMA PRA Category 1 CreditsTM, and is designed to meet your educational requirements including ABR maintenance of certification SAM requirements. This meeting offers 15 SAM credits in the following subspecialties: abdominal imaging, breast imaging, cardiac imaging, chest imag ...
... The meeting offers 54.75 AMA PRA Category 1 CreditsTM, and is designed to meet your educational requirements including ABR maintenance of certification SAM requirements. This meeting offers 15 SAM credits in the following subspecialties: abdominal imaging, breast imaging, cardiac imaging, chest imag ...
Dose and image quality for a cone-beam C-arm
... All dose values herein represent in-phantom doses in units of air kerma 共f-factor= 0.876兲. The dose was measured in the phantom midplane at the isocenter and also at eight peripheral positions in the 16 cm Perspex® dosimetry phantom at 1 cm depth from the surface. The C-arm was placed headside and r ...
... All dose values herein represent in-phantom doses in units of air kerma 共f-factor= 0.876兲. The dose was measured in the phantom midplane at the isocenter and also at eight peripheral positions in the 16 cm Perspex® dosimetry phantom at 1 cm depth from the surface. The C-arm was placed headside and r ...
Ultrasound vs MRI in Diagnosis of Fetal and
... Ultrasound is the screening modality of choice for the fetal imaging. However, there are circumstances in which an alternative imaging technique is needed for additional information regarding fetal anatomy and pathology as well as different maternal conditions. Magnetic resonance imaging (MRI) is be ...
... Ultrasound is the screening modality of choice for the fetal imaging. However, there are circumstances in which an alternative imaging technique is needed for additional information regarding fetal anatomy and pathology as well as different maternal conditions. Magnetic resonance imaging (MRI) is be ...
Full Text - Diagnostic and Interventional Radiology
... overlying the vessel of interest. In addition, US is highly operator dependent. Because the present patient was in a post-traumatic setting, Doppler US was not performed. Supra-aortic arterial and venous structures may be visualized with a high imaging quality using MDCT technology, which offers a r ...
... overlying the vessel of interest. In addition, US is highly operator dependent. Because the present patient was in a post-traumatic setting, Doppler US was not performed. Supra-aortic arterial and venous structures may be visualized with a high imaging quality using MDCT technology, which offers a r ...
Non-invasive imaging techniques in assessing
... The CT evaluation of non-alcoholic fatty liver disease depends on the value of Hounsfield Units (HUs), which represents the attenuation parameters of hepatic parenchyma [12,14,15,38]. The normal hepatic tissue has an attenuation value of around 50-65 HU, 8-10 HU higher than a normal spleen [11]. Fat ...
... The CT evaluation of non-alcoholic fatty liver disease depends on the value of Hounsfield Units (HUs), which represents the attenuation parameters of hepatic parenchyma [12,14,15,38]. The normal hepatic tissue has an attenuation value of around 50-65 HU, 8-10 HU higher than a normal spleen [11]. Fat ...
Fat-Suppression Techniques for 3-T MR Imaging of the Musculo
... resolution and improve the visibility of lesions to determine their lipid content and remove some artifacts. In musculoskeletal MR imaging, fat suppression is specifically used to improve depiction of bone-marrow edema (ie, lesions), confirm or exclude the presence of fat in softtissue tumors, diffe ...
... resolution and improve the visibility of lesions to determine their lipid content and remove some artifacts. In musculoskeletal MR imaging, fat suppression is specifically used to improve depiction of bone-marrow edema (ie, lesions), confirm or exclude the presence of fat in softtissue tumors, diffe ...
Attenuation, Scatter, and Spatial Resolution Compensation in SPECT
... for the left-anterior oblique view, and 2.21 for the left lateral view. Photons undergoing classical scattering do not change energy during the interaction; thus they can not be separated from transmitted photons on the basis of their energy. At the photon energies of interest in SPECT imaging, clas ...
... for the left-anterior oblique view, and 2.21 for the left lateral view. Photons undergoing classical scattering do not change energy during the interaction; thus they can not be separated from transmitted photons on the basis of their energy. At the photon energies of interest in SPECT imaging, clas ...
QIBA DWI Profile
... thickness, quantity of slices) to accommodate a range in patient body habitus. The DWI phantom physical characteristics and imaging protocol can be designed for similarity with the clinical study protocol, but range in all acquisition settings must be minimized. A small parameter range for DWI phant ...
... thickness, quantity of slices) to accommodate a range in patient body habitus. The DWI phantom physical characteristics and imaging protocol can be designed for similarity with the clinical study protocol, but range in all acquisition settings must be minimized. A small parameter range for DWI phant ...
Gradual transition
... the report is to examine whether task sharing between radiographers and radiologists is a practical method by which to solve bottlenecks within diagnostic imaging. The report is based on a systematic search of national and international literature in the field, on interviews with practitioners invol ...
... the report is to examine whether task sharing between radiographers and radiologists is a practical method by which to solve bottlenecks within diagnostic imaging. The report is based on a systematic search of national and international literature in the field, on interviews with practitioners invol ...
The value of single-shot turbo spin-echo diffusion
... Recently, two reports have discussed the use of a nonEPI-based DW sequence instead of DW EPI in the evaluation of middle ear cholesteatoma [8, 9]. Both sequences appear to be DW fast SE sequences having clearly fewer susceptibility artifacts and a higher resolution than DW EPI. Remarkably, in the st ...
... Recently, two reports have discussed the use of a nonEPI-based DW sequence instead of DW EPI in the evaluation of middle ear cholesteatoma [8, 9]. Both sequences appear to be DW fast SE sequences having clearly fewer susceptibility artifacts and a higher resolution than DW EPI. Remarkably, in the st ...
Artifacts and pitfalls in diffusion MRI
... The second major source of artifacts, which is still related to the use of strong gradient pulses, is patient motion. While any MRI sequence is more or less prone to motion artifacts, diffusion MRI is exquisitely sensitive to motion. In the presence of the long and strong gradient pulses, microscopi ...
... The second major source of artifacts, which is still related to the use of strong gradient pulses, is patient motion. While any MRI sequence is more or less prone to motion artifacts, diffusion MRI is exquisitely sensitive to motion. In the presence of the long and strong gradient pulses, microscopi ...
Cone-beam x-ray phase-contrast tomography for the observation of
... For medical diagnostics, x-ray imaging is of great importance as the interactions with matter are so small that internal structures in oblique objects like the human body can be observed in a non-destructive way. Even shortly after the discovery of x-rays in 1895, the technique was used to image bon ...
... For medical diagnostics, x-ray imaging is of great importance as the interactions with matter are so small that internal structures in oblique objects like the human body can be observed in a non-destructive way. Even shortly after the discovery of x-rays in 1895, the technique was used to image bon ...
dynamic contrast-enhanced breast mri - Stacks
... detecting tumors, but has suffered from low specificity. Accuracy of tumor detection and characterization is enhanced by high-quality images with high temporal resolution. This thesis presents imaging techniques for improving DCE breast MRI in terms of image quality and imaging speed. Bilateral brea ...
... detecting tumors, but has suffered from low specificity. Accuracy of tumor detection and characterization is enhanced by high-quality images with high temporal resolution. This thesis presents imaging techniques for improving DCE breast MRI in terms of image quality and imaging speed. Bilateral brea ...
Diffusion Tensor Imaging in the Cervical Spinal Cord
... Diffusion tensor magnetic resonance imaging (DT-MRI or DTI) is an imaging technique that is sensitive to the diffusion movement of water contained in tissue. It is used to quantify parameters such as the diffusivity and its directionality. Because diffusion is intimately connected to the tissue micr ...
... Diffusion tensor magnetic resonance imaging (DT-MRI or DTI) is an imaging technique that is sensitive to the diffusion movement of water contained in tissue. It is used to quantify parameters such as the diffusivity and its directionality. Because diffusion is intimately connected to the tissue micr ...
2009 Program - Society for Magnetic Resonance
... It is with great pleasure that we welcome everyone back to Michigan State University for the 21st International Conference in MR Angiography. Since being founded by a team lead by Dr. Jim Potchen in 1989, Michigan State University has been proud to host the annual meeting on three previous occasions ...
... It is with great pleasure that we welcome everyone back to Michigan State University for the 21st International Conference in MR Angiography. Since being founded by a team lead by Dr. Jim Potchen in 1989, Michigan State University has been proud to host the annual meeting on three previous occasions ...
Soft Tissue Tumors
... for either CT or MRI in an attempt to improve the contrast resolution in evaluation of soft tissue tumors. In general, contrast is much more important for CT (several precontrast images should also be obtained for comparison) in differentiating soft tissue tumors from surrounding muscle because of i ...
... for either CT or MRI in an attempt to improve the contrast resolution in evaluation of soft tissue tumors. In general, contrast is much more important for CT (several precontrast images should also be obtained for comparison) in differentiating soft tissue tumors from surrounding muscle because of i ...
Radiation Dose and Safety: Informatics Standards and Tools
... in the CT projections relative to a projection model of the patient CT image, a reduction in the difference between the estimated model and the measured image data is used to improve successive iterative steps such that noise is selectively reduced. A model-based method that takes into account chara ...
... in the CT projections relative to a projection model of the patient CT image, a reduction in the difference between the estimated model and the measured image data is used to improve successive iterative steps such that noise is selectively reduced. A model-based method that takes into account chara ...
A Guide to CT Radiation Dose Management
... Introduced in the early 1970s, computed tomography (CT) has become an invaluable diagnostic tool. Today, approximately 81 million CT scans are performed annually in the United States alone.1 ...
... Introduced in the early 1970s, computed tomography (CT) has become an invaluable diagnostic tool. Today, approximately 81 million CT scans are performed annually in the United States alone.1 ...
Cross Sectional Imaging Nuclear Medicine
... Cross Sectional Imaging • No superimposition of structures • Excellent contrast resolution – can see the difference between 2 similar tissues • For CT – scan can be performed in one plane (usually transverse) and reformatted in the others (sag, dorsal) • CT – good for bone and soft tissue • MRI – b ...
... Cross Sectional Imaging • No superimposition of structures • Excellent contrast resolution – can see the difference between 2 similar tissues • For CT – scan can be performed in one plane (usually transverse) and reformatted in the others (sag, dorsal) • CT – good for bone and soft tissue • MRI – b ...
article in press - The EndoExperience
... Ludlow et al. shows a good overall reproducibility (2.5% variation between repeated identical examinations), although some specific TLD locations showed a large variation [11]. It is clear that effective dose estimations are dependent on many factors which are not standardised, such as the phantom i ...
... Ludlow et al. shows a good overall reproducibility (2.5% variation between repeated identical examinations), although some specific TLD locations showed a large variation [11]. It is clear that effective dose estimations are dependent on many factors which are not standardised, such as the phantom i ...
Optical coherence tomography (OCT) of collagen in
... Department of Dermatology, State University of New York Downstate Medical Center, Brooklyn, NY 11203, USA ...
... Department of Dermatology, State University of New York Downstate Medical Center, Brooklyn, NY 11203, USA ...
Evaluation of the Reliability and Accuracy of Using Cone
... cumulative score for each lesion was documented. The final score for each lesion was a number between 0 and 6 according to the number of positive findings. Evaluation of Diagnostic Criteria For each lesion, we computed a cumulative score 0–6 as explained in the prior section. A score of 1 meant that ...
... cumulative score for each lesion was documented. The final score for each lesion was a number between 0 and 6 according to the number of positive findings. Evaluation of Diagnostic Criteria For each lesion, we computed a cumulative score 0–6 as explained in the prior section. A score of 1 meant that ...
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.