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Transplanted Kidney Function Evaluation
... obtained at predetermined times after renal transplantation, and these are called protocol biopsies.5 The rationale behind the protocol biopsies is the potential benefit of early recognition of allograft pathologies, thus their earlier treatment resulting in a better long-term outcome. However, there ...
... obtained at predetermined times after renal transplantation, and these are called protocol biopsies.5 The rationale behind the protocol biopsies is the potential benefit of early recognition of allograft pathologies, thus their earlier treatment resulting in a better long-term outcome. However, there ...
The concept and challenges of TomoTherapy accelerators
... In the 1970s, the invention and subsequent medical use of the x-ray computed tomography (CT) led to 2D radiotherapy, and 20 years later, advances in computer technology made 3D conformal radiotherapy possible. Currently, image-guided radiation therapy (IGRT) refers to many techniques, which apply va ...
... In the 1970s, the invention and subsequent medical use of the x-ray computed tomography (CT) led to 2D radiotherapy, and 20 years later, advances in computer technology made 3D conformal radiotherapy possible. Currently, image-guided radiation therapy (IGRT) refers to many techniques, which apply va ...
Radiofrequency Ablation of Aldosteronomas (Conns Syndrome): A New Application of IR
... I-131 meta-iodobenzylguanidine (MIBG) assesses medullary function I-131 6-beta-iodomethyl-19-norcholesterol (NP-59) assesses cortex Leah Hawkins, MSIII Gillian Lieberman, MD ...
... I-131 meta-iodobenzylguanidine (MIBG) assesses medullary function I-131 6-beta-iodomethyl-19-norcholesterol (NP-59) assesses cortex Leah Hawkins, MSIII Gillian Lieberman, MD ...
evaluation of elegp collimator with resolution recovery for spect/ct
... electrons are then amplified by a chain of dynodes, and an electrical pulse can be measured. By knowing the size of the electrical pulse it is possible to calculate where the light photons originated. The electrical pulses are then processed in a matrix of electronics. It can be shown both mathemati ...
... electrons are then amplified by a chain of dynodes, and an electrical pulse can be measured. By knowing the size of the electrical pulse it is possible to calculate where the light photons originated. The electrical pulses are then processed in a matrix of electronics. It can be shown both mathemati ...
Magnetic Resonance Imaging - American College of Radiology
... Resonance Imaging Equipment [Res. 34–2014]. The committee has applied these principles to describe which personnel are responsible for which specific tasks and delineate methods for evaluating equipment performance with many tests using the American College of Radiology’s magnetic resonance imaging ...
... Resonance Imaging Equipment [Res. 34–2014]. The committee has applied these principles to describe which personnel are responsible for which specific tasks and delineate methods for evaluating equipment performance with many tests using the American College of Radiology’s magnetic resonance imaging ...
3D and 4D Fetal Ultrasound Advances Spark Research
... May features a video interview with Laurence Clarke, Ph.D., discussing the role of quantitative imaging in cancer as a means of predicting and measuring response to cancer therapy and a video of the 3D fetal ultrasound technology that offers researchers more detailed views of the fetus and parents a ...
... May features a video interview with Laurence Clarke, Ph.D., discussing the role of quantitative imaging in cancer as a means of predicting and measuring response to cancer therapy and a video of the 3D fetal ultrasound technology that offers researchers more detailed views of the fetus and parents a ...
An X-ray Source Model and Characterization Method for Computing
... phantoms for radiographic imaging procedures. We then measured imaging doses in homogeneous cylindrical and heterogeneous anthropomorphic phantoms for default CBCT protocols. The percent dose difference between measurement and computation was generally ≤ 3% in homogeneous and ≤ 6% in heterogeneous g ...
... phantoms for radiographic imaging procedures. We then measured imaging doses in homogeneous cylindrical and heterogeneous anthropomorphic phantoms for default CBCT protocols. The percent dose difference between measurement and computation was generally ≤ 3% in homogeneous and ≤ 6% in heterogeneous g ...
Diffusion-weighted magnetic resonance imaging of the temporal bone
... and motion artefacts [3]. With the use of higher magnetic fields, these artefacts and image distortions on EP DW imaging are even more pronounced. Due to the low incidence of movement artefact, the high brain homogeneity and high signal-to-noise ratio research at the onset was mainly focused on the ...
... and motion artefacts [3]. With the use of higher magnetic fields, these artefacts and image distortions on EP DW imaging are even more pronounced. Due to the low incidence of movement artefact, the high brain homogeneity and high signal-to-noise ratio research at the onset was mainly focused on the ...
Optimization of image acquisition parameters in chest
... Although new CT technology and reconstruction algorithms have led to possibilities of reducing the resulting radiation dose to the patient from a CT examination [16], most clinical tasks still result in effective doses up to several mSv [7, 17-20], considerably higher than that for a CXR examination ...
... Although new CT technology and reconstruction algorithms have led to possibilities of reducing the resulting radiation dose to the patient from a CT examination [16], most clinical tasks still result in effective doses up to several mSv [7, 17-20], considerably higher than that for a CXR examination ...
MRI Handbook: MR Physics, Patient Positioning, and Protocols
... After the first MR image was acquired in experimental phantom tubes almost 40 years ago, magnetic resonance imaging (MRI) has developed significantly and become one of today’s most interesting and irreplaceable imaging modalities. MRI is used to find answers to medical questions by utilizing various ...
... After the first MR image was acquired in experimental phantom tubes almost 40 years ago, magnetic resonance imaging (MRI) has developed significantly and become one of today’s most interesting and irreplaceable imaging modalities. MRI is used to find answers to medical questions by utilizing various ...
QC PHANTOMS
... assessment of mammoscintigraphy techniques.The Striatal Phantom optimizes quantitative imaging in patients, using PET or SPECT. Myocardial perfusion SPECT is a widely-used, non-invasive method for the diagnosis and management of patients with coronary disease. However, non-uniform photon attenuation ...
... assessment of mammoscintigraphy techniques.The Striatal Phantom optimizes quantitative imaging in patients, using PET or SPECT. Myocardial perfusion SPECT is a widely-used, non-invasive method for the diagnosis and management of patients with coronary disease. However, non-uniform photon attenuation ...
Evaluation of Parotid Gland Function using Equivalent - J
... ECR values (signal intensity on ECRI), maximum uptake rate (MUR) and washout rate (WOR) from salivary gland scintigraphy data at the parotid glands. Second, we investigated correlations between ECR values and each parameter of MUR (uptake function) and WOR (secretory function) obtained by salivary g ...
... ECR values (signal intensity on ECRI), maximum uptake rate (MUR) and washout rate (WOR) from salivary gland scintigraphy data at the parotid glands. Second, we investigated correlations between ECR values and each parameter of MUR (uptake function) and WOR (secretory function) obtained by salivary g ...
Low insertion of a cystic duct into the common bile duct as a cause
... medial insertion. Instead of the CBD, the cystic duct may join the right hepatic duct, left hepatic duct or common hepatic duct. The cystic duct may also join low in the intrapancreatic, intraduodenal CBD or at the ampulla of Vater. Rarely does the cystic duct insert into the duodenum.(2) In additio ...
... medial insertion. Instead of the CBD, the cystic duct may join the right hepatic duct, left hepatic duct or common hepatic duct. The cystic duct may also join low in the intrapancreatic, intraduodenal CBD or at the ampulla of Vater. Rarely does the cystic duct insert into the duodenum.(2) In additio ...
Evaluation of image quality and patient radiation dose in digital
... Only a few years ago, flat-panel detectors with integrated read-out mechanisms became commercially available for implementation in digital radiography applications. The latter detectors provide an instant image display and use a thin-film transistor array for signal transport. Conversion of x-rays i ...
... Only a few years ago, flat-panel detectors with integrated read-out mechanisms became commercially available for implementation in digital radiography applications. The latter detectors provide an instant image display and use a thin-film transistor array for signal transport. Conversion of x-rays i ...
Dental Caries Diagnostic Methods
... examination of every tooth surface, is by far the most commonly applied method in ...
... examination of every tooth surface, is by far the most commonly applied method in ...
December - BIDMC Radiology Alumni
... commitment to the team and our patients, with the recent staffing challenges you have ensured that patient care remains seamless for those requiring combo appointments, on occasion you have worked through your shift to ensure that a “hand off” is not needed ensuring continuity of care for a patient ...
... commitment to the team and our patients, with the recent staffing challenges you have ensured that patient care remains seamless for those requiring combo appointments, on occasion you have worked through your shift to ensure that a “hand off” is not needed ensuring continuity of care for a patient ...
Ms - F6 Publishing Home
... electricity into tissue and it is not limited by charring[2]. Its efficacy has been ...
... electricity into tissue and it is not limited by charring[2]. Its efficacy has been ...
cone beam ct: non-dental applications
... CBCT 3D-cephalometric analysis Conventional lateral cephalograms were used for many years for ortho dontic assessment, treatment and follow-up. On these 2D projection images both the bony structures and the overlying soft tissues could be evaluated and measured prior to surgery or non-surgical orth ...
... CBCT 3D-cephalometric analysis Conventional lateral cephalograms were used for many years for ortho dontic assessment, treatment and follow-up. On these 2D projection images both the bony structures and the overlying soft tissues could be evaluated and measured prior to surgery or non-surgical orth ...
Proton radiography and tomography - Surrey Research Insight Open
... for water, is approximately constant with energy and its slow variation is well-understood.3 It is this fact that makes proton transmission imaging potentially so useful for treatment planning. The goal of pRG/pCT data acquisition is to arrive at a set of values of water-equivalent path-lengths (WEP ...
... for water, is approximately constant with energy and its slow variation is well-understood.3 It is this fact that makes proton transmission imaging potentially so useful for treatment planning. The goal of pRG/pCT data acquisition is to arrive at a set of values of water-equivalent path-lengths (WEP ...
Cone Beam Computed Tomography (CBCT) Dosimetry
... MC model of the OBI x-ray tube was built into the system and validated by measurements characterizing the cone beam quality in the aspects of the x-ray spectrum, half value layer (HVL) and dose profiles for both full-fan and half-fan modes. Using the validated MC model, CTDICB, dose profile integral ...
... MC model of the OBI x-ray tube was built into the system and validated by measurements characterizing the cone beam quality in the aspects of the x-ray spectrum, half value layer (HVL) and dose profiles for both full-fan and half-fan modes. Using the validated MC model, CTDICB, dose profile integral ...
CAR Guidelines and Standards for Cardiac Computed Tomography
... coronary calcification, high heart rate, heart rate variability and body mass index. Higher levels of coronary calcification are associated with poorer 64 detector CCTA diagnostic performance with various authors showing increased number of unassessable segments, lower specificity, lower positive pr ...
... coronary calcification, high heart rate, heart rate variability and body mass index. Higher levels of coronary calcification are associated with poorer 64 detector CCTA diagnostic performance with various authors showing increased number of unassessable segments, lower specificity, lower positive pr ...
Imaging of knee injuries with special focus on tibial plateau
... are often difficult to obtain, and in those patients, radiography is unreliable to rule out fractures. Study II showed that MDCT can serve to evaluate cruciate ligaments as well. MDCT detected intact cruciate ligaments with good specificity, accuracy, and negative predictive value, but the assessme ...
... are often difficult to obtain, and in those patients, radiography is unreliable to rule out fractures. Study II showed that MDCT can serve to evaluate cruciate ligaments as well. MDCT detected intact cruciate ligaments with good specificity, accuracy, and negative predictive value, but the assessme ...
Assessment of acute myocardial infarction: current status and
... Catheter based angiography With the rapid development of primary angioplasty catheter angiography and percutaneous intervention have become central to the diagnostic and treatment of myocardial infarction. Primary PCI (percutaneous coronary intervention) is superior to fibrinolytic therapy in reduci ...
... Catheter based angiography With the rapid development of primary angioplasty catheter angiography and percutaneous intervention have become central to the diagnostic and treatment of myocardial infarction. Primary PCI (percutaneous coronary intervention) is superior to fibrinolytic therapy in reduci ...
CT angiography techniques
... Time-to-peak enhancement differs for different target arteries (PA – coronary – aorta – foot) ...
... Time-to-peak enhancement differs for different target arteries (PA – coronary – aorta – foot) ...
Positron emission tomography
![](https://commons.wikimedia.org/wiki/Special:FilePath/ECAT-Exact-HR--PET-Scanner.jpg?width=300)
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.