CT Dose
... 0.4% of all cancers in the United States may be attributable to the radiation from CT studies…By adjusting this estimate for current CT use this estimate might now be in the range of 1.5 to 2.0%.” ...
... 0.4% of all cancers in the United States may be attributable to the radiation from CT studies…By adjusting this estimate for current CT use this estimate might now be in the range of 1.5 to 2.0%.” ...
(a) analytic linogram and (b) - Repositório da Universidade Nova de
... Matela. Thank you, not only for your constant assistance and guidance in this study but also for all the support, patience and friendship! It has been great working with you. To Nuno Oliveira, I would like to show my gratitude for all the work developed in the creation and maintenance of Quasimanage ...
... Matela. Thank you, not only for your constant assistance and guidance in this study but also for all the support, patience and friendship! It has been great working with you. To Nuno Oliveira, I would like to show my gratitude for all the work developed in the creation and maintenance of Quasimanage ...
-1 - 1. Introduction: The specialty of radiology has grown enormously
... supervise, and perform the imaging procedures to such a level of competence, and across a broad range of radiological practice, as to function as a consultant to referring general physicians and specialists. Knowledge, technical skills, and communication skills are the three pillars on which a radio ...
... supervise, and perform the imaging procedures to such a level of competence, and across a broad range of radiological practice, as to function as a consultant to referring general physicians and specialists. Knowledge, technical skills, and communication skills are the three pillars on which a radio ...
Quantitative assessment of scatter correction techniques
... and fast acquisition speed. Dual-source CT (DSCT) imaging can now provide anatomical, functional, and quantitative information about the lung. CT technology has rapidly evolved from its introduction in the medical field in the early 1970s, and its development through the decades has produced a profo ...
... and fast acquisition speed. Dual-source CT (DSCT) imaging can now provide anatomical, functional, and quantitative information about the lung. CT technology has rapidly evolved from its introduction in the medical field in the early 1970s, and its development through the decades has produced a profo ...
NYU Radiology Alpine Imaging Symposium 13th Annual
... The essentials presented in this program are meant to be integrated into the participants’ practice in an effort to improve their current knowledge, imaging skills and ultimately to improve patient care. ...
... The essentials presented in this program are meant to be integrated into the participants’ practice in an effort to improve their current knowledge, imaging skills and ultimately to improve patient care. ...
Basics of Magnetic Resonance Imaging
... change in the frequency of precession of the protons arranged along the axis of the applied supplemental gradient (recall that the frequency of a proton’s precession is directly proportional to the magnetic field strength it experiences as related by the gyromagnetic constant). To image a particular ...
... change in the frequency of precession of the protons arranged along the axis of the applied supplemental gradient (recall that the frequency of a proton’s precession is directly proportional to the magnetic field strength it experiences as related by the gyromagnetic constant). To image a particular ...
Volumetric Perfusion CT Using Prototype 256
... must be given to dose minimization (9), high doses are presently unavoidable because the beam width of the 256 – detector row CT is ⬎3 times that of 64 – detector row CT and because radiation scatter increases as beam width widens. Because volumetric perfusion CT imaging results vary widely dependin ...
... must be given to dose minimization (9), high doses are presently unavoidable because the beam width of the 256 – detector row CT is ⬎3 times that of 64 – detector row CT and because radiation scatter increases as beam width widens. Because volumetric perfusion CT imaging results vary widely dependin ...
Stafne bone cavity – Magnetic resonance imaging
... The fact that CT is more specific to bone lesions of the jaws and much less so to soft tissue have led some outhors to advocate MR imaging as the primary diagnostic technique (5-7). Some authors however, have advocated MR imaging only after they had exposed their patients to unnecessary surgical exp ...
... The fact that CT is more specific to bone lesions of the jaws and much less so to soft tissue have led some outhors to advocate MR imaging as the primary diagnostic technique (5-7). Some authors however, have advocated MR imaging only after they had exposed their patients to unnecessary surgical exp ...
Abdominal Aorta, Renal Arteries and Run
... scanner available). Once the contrast medium arrival time has been determined (either by the bolus test or the trigger technique), even when scanning with a high spatial resolution (4×1, 16×0.75) the scan time will not exceed 15 s. This protocol allows ...
... scanner available). Once the contrast medium arrival time has been determined (either by the bolus test or the trigger technique), even when scanning with a high spatial resolution (4×1, 16×0.75) the scan time will not exceed 15 s. This protocol allows ...
MiniMedSchool_Imagin..
... Benjamin M. Ellingson, Ph.D., Dept. of Radiological Sciences, David Geffen School of Medicine at UCLA, 2011 ...
... Benjamin M. Ellingson, Ph.D., Dept. of Radiological Sciences, David Geffen School of Medicine at UCLA, 2011 ...
ORIGINAL ARTICLE ORIG ORIGI CT for upper abdominal pathology
... to reliably predict the presence and extent of any thrombus of the vena cava.24 RCC can appear iso-, hyper-, or hypodense on uncontrasted CT scans, and usually demonstrates a significant contrast enhancement of about 115 HU and intratumoural areas of necrosis. The detection of visceral metastases ap ...
... to reliably predict the presence and extent of any thrombus of the vena cava.24 RCC can appear iso-, hyper-, or hypodense on uncontrasted CT scans, and usually demonstrates a significant contrast enhancement of about 115 HU and intratumoural areas of necrosis. The detection of visceral metastases ap ...
Hypertrophic Columns of Bertin: Imaging Findings
... described that renal cortical substance extends through pyramids in 1774, those cortical substances (septa) that separates the medullary pyramids and extends towards renal pelvis were named as columns of Bertin [1]. This entity was not known well by radiologists until the 1960s, although after the i ...
... described that renal cortical substance extends through pyramids in 1774, those cortical substances (septa) that separates the medullary pyramids and extends towards renal pelvis were named as columns of Bertin [1]. This entity was not known well by radiologists until the 1960s, although after the i ...
Management of pediatric radiation dose using
... generator, automatic exposure control (AEC)). Therefore, information about the exposure parameters for any image (kVp, mA, s, filtration, source-image distance (SID), grid, etc.) must generally be entered into the CR acquisition system manually by the radiographer. This is an infrequent event in norm ...
... generator, automatic exposure control (AEC)). Therefore, information about the exposure parameters for any image (kVp, mA, s, filtration, source-image distance (SID), grid, etc.) must generally be entered into the CR acquisition system manually by the radiographer. This is an infrequent event in norm ...
Notes on Computerized Tomography
... In this chapter we consider systems that provide important tomographic or threedimensional (3D) capability. The tomogram is effectively an image of a slice taken through a 3D volume. Ideally, it is free of the effects of intervening structures, thus providing distinct improvement on the ability to v ...
... In this chapter we consider systems that provide important tomographic or threedimensional (3D) capability. The tomogram is effectively an image of a slice taken through a 3D volume. Ideally, it is free of the effects of intervening structures, thus providing distinct improvement on the ability to v ...
Extratesticular epidermoid cyst mimicking enlarged testis
... T1-weighted images and high signal on T2-weighted images. There may be low-signal-intensity foci in the cyst, representing keratin debris, and no contrast enhancement. Furthermore, MR imaging can depict the atrophic testis which may be missed on sonography. In our case, the valuable information of M ...
... T1-weighted images and high signal on T2-weighted images. There may be low-signal-intensity foci in the cyst, representing keratin debris, and no contrast enhancement. Furthermore, MR imaging can depict the atrophic testis which may be missed on sonography. In our case, the valuable information of M ...
Acceptance testing for nuclear medicine instrumentation
... All test methods and results must be recorded carefully and archived, so that all future quality control tests can be accurately compared with the test data acquired at acceptance. These data form the start of a log-book or digital record for the instrument. ...
... All test methods and results must be recorded carefully and archived, so that all future quality control tests can be accurately compared with the test data acquired at acceptance. These data form the start of a log-book or digital record for the instrument. ...
From Chest Pain to Multiple Myeloma: Radiology in Practice
... MM imaging: FDG PET • FDG (Flourodeoxyglucose): a glucose analogue • PET (Position Emission Tomography): nuclear imaging modality that creates 3D images of functional processes in the body – Detects gamma rays emitted by a positron-emitting radionuclide tracer – Tracer is ligated to biologically act ...
... MM imaging: FDG PET • FDG (Flourodeoxyglucose): a glucose analogue • PET (Position Emission Tomography): nuclear imaging modality that creates 3D images of functional processes in the body – Detects gamma rays emitted by a positron-emitting radionuclide tracer – Tracer is ligated to biologically act ...
Imaging Bronchogenic Carcinoma
... elevated alkaline phosphatase).80 Bone radiographs, radionuclide bone scanning with 99 technetium-methylene diphosphonate or MRI are useful modalities for further investigation.49 Occult skeletal metastases are rarely (up to 4%) detected by radionuclide 99 technetium-methylene diphosphonate studies, ...
... elevated alkaline phosphatase).80 Bone radiographs, radionuclide bone scanning with 99 technetium-methylene diphosphonate or MRI are useful modalities for further investigation.49 Occult skeletal metastases are rarely (up to 4%) detected by radionuclide 99 technetium-methylene diphosphonate studies, ...
Spleen Fine Needle Aspiration
... splenic involvement. CT shows an enlarged spleen with hypoattenuating lesions on nonenhanced scans and contrast enhancement is variable. ...
... splenic involvement. CT shows an enlarged spleen with hypoattenuating lesions on nonenhanced scans and contrast enhancement is variable. ...
Each of the six sections of the written examination objectives is
... Each of the six sections of the written examination objectives is designed to provide an ACVR eligible resident with a framework from which to study. The objectives are not all inclusive but should provide a minimum knowledge base needed to pass the written examination. A candidate must obtain a sco ...
... Each of the six sections of the written examination objectives is designed to provide an ACVR eligible resident with a framework from which to study. The objectives are not all inclusive but should provide a minimum knowledge base needed to pass the written examination. A candidate must obtain a sco ...
A New Approach for Motion Correction in SPECT - CEUR
... artefacts. These motion artefacts may significantly affect the diagnostic accuracy [2, 3, 4]. Different methods have been proposed for the correction of motion in SPECT studies. These methods may be divided into three categories. The first two approaches do produce motion corrected projections and t ...
... artefacts. These motion artefacts may significantly affect the diagnostic accuracy [2, 3, 4]. Different methods have been proposed for the correction of motion in SPECT studies. These methods may be divided into three categories. The first two approaches do produce motion corrected projections and t ...
Technical assessment of a cone-beam CT scanner
... of CBCT employ variations of the Feldkamp-Davis-Kress (FDK) algorithm1 for 3D filtered backprojection, although CBCT will similarly benefit from advances in iterative reconstruction techniques and low-dose protocols.2 The scope of application-specific CBCT embodiments include dental/maxillofacial im ...
... of CBCT employ variations of the Feldkamp-Davis-Kress (FDK) algorithm1 for 3D filtered backprojection, although CBCT will similarly benefit from advances in iterative reconstruction techniques and low-dose protocols.2 The scope of application-specific CBCT embodiments include dental/maxillofacial im ...
as a PDF
... problem and underwent a thorough clinical investigation including medical history, cognitive screening (MMSE), physical and neurological examination, laboratory blood tests, apolipoprotein E genotyping, neuropsychological assessment, lumbar puncture, and magnetic resonance imaging/computed tomograph ...
... problem and underwent a thorough clinical investigation including medical history, cognitive screening (MMSE), physical and neurological examination, laboratory blood tests, apolipoprotein E genotyping, neuropsychological assessment, lumbar puncture, and magnetic resonance imaging/computed tomograph ...
Paper - Calvin College
... stated, “The great field strength debate lasted one decade…Increasing field strength was an obvious, and expensive, approach to improve image quality. Although it is unarguable that increasing field strength increases image quality by increasing image signal-to-noise ratios (SNR) achievable during a ...
... stated, “The great field strength debate lasted one decade…Increasing field strength was an obvious, and expensive, approach to improve image quality. Although it is unarguable that increasing field strength increases image quality by increasing image signal-to-noise ratios (SNR) achievable during 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.