BreAking the trend of increAsed rAdiAtion exposure to pAtients
... duced burn, mainly driven by the increase in complex interventional fluoroscopy procedures which have led to long exposure times and direct skin damage [7]. Secondly, and probably even more discussed, is the long-term danger of radiation elevating a person’s lifetime risk of cancer. Although the can ...
... duced burn, mainly driven by the increase in complex interventional fluoroscopy procedures which have led to long exposure times and direct skin damage [7]. Secondly, and probably even more discussed, is the long-term danger of radiation elevating a person’s lifetime risk of cancer. Although the can ...
CdTe and CdZnTe detectors in nuclear medicine
... contrast. Spatial localisation of the primary photon's source in SP studies is achieved by the use of a collimator, basically a slab of lead absorber containing long thin, typically parallel, bores. The bore con"nes the detector's "eld of view to a narrow, forward cone at each position of its surfac ...
... contrast. Spatial localisation of the primary photon's source in SP studies is achieved by the use of a collimator, basically a slab of lead absorber containing long thin, typically parallel, bores. The bore con"nes the detector's "eld of view to a narrow, forward cone at each position of its surfac ...
Risks and benefits of cardiac imaging: an analysis of risks
... effects are unlikely to be caused directly by tissue heating.18 Among possible mechanical effects of ultrasound, a potential risk is cavitation: formation and rhythmic oscillation of microbubbles produced from gasses dissolved in living tissue. The mechanical index has been developed as predictor of ...
... effects are unlikely to be caused directly by tissue heating.18 Among possible mechanical effects of ultrasound, a potential risk is cavitation: formation and rhythmic oscillation of microbubbles produced from gasses dissolved in living tissue. The mechanical index has been developed as predictor of ...
Molecular imaging using positron emission tomography in
... response to treatment with cytotoxics. At 2 hours following pulse treatment with 5fluorouracil, (and before changes in cell numbers and cell cycle phase were seen), a dose dependent increase in 18F-FLT uptake was seen. No change was observed with 18F-FDG nor following Cisplatin treatment. This adapt ...
... response to treatment with cytotoxics. At 2 hours following pulse treatment with 5fluorouracil, (and before changes in cell numbers and cell cycle phase were seen), a dose dependent increase in 18F-FLT uptake was seen. No change was observed with 18F-FDG nor following Cisplatin treatment. This adapt ...
Article (Published version)
... to x-ray CT, MRI signals are not correlated with electron density and photon attenuating properties of tissues, but rather to proton density and magnetic relaxation properties. Therefore, there is no unique global mapping technique to convert MRI intensities to attenuation coefficients. Similar to e ...
... to x-ray CT, MRI signals are not correlated with electron density and photon attenuating properties of tissues, but rather to proton density and magnetic relaxation properties. Therefore, there is no unique global mapping technique to convert MRI intensities to attenuation coefficients. Similar to e ...
Near-Infrared Resonant Nanoshells for Combined
... tissue compared to normal tissue. This study used a commercially available OCT imaging system (Niris Imaging System, Imalux, Cleveland, OH). The axial and transverse resolutions were measured to be approximately 10 and 15 µm, respectively. OCT images of the tumor and normal tissue was taken after 20 ...
... tissue compared to normal tissue. This study used a commercially available OCT imaging system (Niris Imaging System, Imalux, Cleveland, OH). The axial and transverse resolutions were measured to be approximately 10 and 15 µm, respectively. OCT images of the tumor and normal tissue was taken after 20 ...
2016 Medicare Nuclear Medicine
... serious adverse events such as myocardial infarction, arrhythmia, hypotension, bronchoconstriction and cerebrovascular events. • CARDIOLITE® has been rarely associated with acute severe allergic and anaphylactic events of angioedema and generalized urticaria. In some patients the allergic sy ...
... serious adverse events such as myocardial infarction, arrhythmia, hypotension, bronchoconstriction and cerebrovascular events. • CARDIOLITE® has been rarely associated with acute severe allergic and anaphylactic events of angioedema and generalized urticaria. In some patients the allergic sy ...
Radiation protection in the cathlab
... Rule of thumb: For every 1000 photons reaching the patient, about 100-200 are scattered, about 20 reach the image detector, and the rest are absorbed (contributing to patient dose) ...
... Rule of thumb: For every 1000 photons reaching the patient, about 100-200 are scattered, about 20 reach the image detector, and the rest are absorbed (contributing to patient dose) ...
metomidate positron emission tomography after dexamethasone
... SUVhs and SUVmax (p=0.19; p=0.15). The hormonally silent incidentalomas decreased their average SUVhs to 14.0 and the SUVmax to 15.7 (p=0.21; p=0.26), respectively, after dexamethasone suppression. The normal adrenal glands in the patients with non-functional incidentalomas decreased to SUVhs 10.1 a ...
... SUVhs and SUVmax (p=0.19; p=0.15). The hormonally silent incidentalomas decreased their average SUVhs to 14.0 and the SUVmax to 15.7 (p=0.21; p=0.26), respectively, after dexamethasone suppression. The normal adrenal glands in the patients with non-functional incidentalomas decreased to SUVhs 10.1 a ...
ViewRay™ References
... A commercially-available MRI-IGRT system was used for this investigation. Currently, the system allows real-time planar (2D) imaging at four frames per second. To achieve high-quality, low-noise volumetric images during radiation therapy delivery, an investigation of a novel compressed-sensing algor ...
... A commercially-available MRI-IGRT system was used for this investigation. Currently, the system allows real-time planar (2D) imaging at four frames per second. To achieve high-quality, low-noise volumetric images during radiation therapy delivery, an investigation of a novel compressed-sensing algor ...
Managing the imaging dose during Image-guided Radiotherapy Martin J Murphy PhD
... • not everyone has the same sensitivity – children are 10 times more sensitive than adults; girls are more sensitive than boys, women have different organ sensitivities than men. • Not everyone is in the same risk category – a seventy year old man undergoing image-guided prostate treatments is in an ...
... • not everyone has the same sensitivity – children are 10 times more sensitive than adults; girls are more sensitive than boys, women have different organ sensitivities than men. • Not everyone is in the same risk category – a seventy year old man undergoing image-guided prostate treatments is in an ...
Performance in CT SOMATOM Sensation
... resolution of below 0.4 mm, visualizing the smallest pathology and finest anatomical structures with exceptional quality, whether complex inner-ear bones or the finest vessels of the coronary tree. SOMATOM Sensation provides comprehensive CT Clinical Engines, allowing you to perform everything from ...
... resolution of below 0.4 mm, visualizing the smallest pathology and finest anatomical structures with exceptional quality, whether complex inner-ear bones or the finest vessels of the coronary tree. SOMATOM Sensation provides comprehensive CT Clinical Engines, allowing you to perform everything from ...
Part I - Revising the sellar and parasellar region: normal anatomy
... MRI, due to its high contrast, allows for better depiction of the soft tissue structures which are in direct contact with the bony sella. It is also important to recognize normal MR imaging characteristics of the sellar and parasellar regions. The various sequences in current MRI protocols can help ...
... MRI, due to its high contrast, allows for better depiction of the soft tissue structures which are in direct contact with the bony sella. It is also important to recognize normal MR imaging characteristics of the sellar and parasellar regions. The various sequences in current MRI protocols can help ...
Effects of collimator dependency and correction methods on I
... cardiac cavity, and lungs. Torso region is defined as the background and others as the target regions. ROIs were drawn and image contrasts were calculated in the same way. Results: The measured energy spectra in the striatal phantom are shown for the LE collimator and ME collimator . The magnitude o ...
... cardiac cavity, and lungs. Torso region is defined as the background and others as the target regions. ROIs were drawn and image contrasts were calculated in the same way. Results: The measured energy spectra in the striatal phantom are shown for the LE collimator and ME collimator . The magnitude o ...
Vision 20/20: Magnetic resonance imaging-guided
... to x-ray CT, MRI signals are not correlated with electron density and photon attenuating properties of tissues, but rather to proton density and magnetic relaxation properties. Therefore, there is no unique global mapping technique to convert MRI intensities to attenuation coefficients. Similar to e ...
... to x-ray CT, MRI signals are not correlated with electron density and photon attenuating properties of tissues, but rather to proton density and magnetic relaxation properties. Therefore, there is no unique global mapping technique to convert MRI intensities to attenuation coefficients. Similar to e ...
No Slide Title
... rays. The shorter UV rays can be damaging to life. Beyond UV (still shorter wavelength or higher frequency) are X-rays and the even more powerful gamma rays. Their high energy allows them to penetrate through solid matter. They can cause serious damage to the macromolecules of life. X-rays (also cal ...
... rays. The shorter UV rays can be damaging to life. Beyond UV (still shorter wavelength or higher frequency) are X-rays and the even more powerful gamma rays. Their high energy allows them to penetrate through solid matter. They can cause serious damage to the macromolecules of life. X-rays (also cal ...
ADVANCED IMAGING IN PORTOSYSTEMIC SHUNT DIAGNOSIS
... portosystemic shunts (PSS), including ultrasound, transsplenic scintigraphy, computed tomography (CT) and magnetic resonance imaging (MRI), each with unique advantages and disadvantages. • CT angiography provides the best detail of overall shunt anatomy and is also helpful in rechecking patients wit ...
... portosystemic shunts (PSS), including ultrasound, transsplenic scintigraphy, computed tomography (CT) and magnetic resonance imaging (MRI), each with unique advantages and disadvantages. • CT angiography provides the best detail of overall shunt anatomy and is also helpful in rechecking patients wit ...
Fiducial Markers in Image-guided Radiotherapy
... Fiducial markers are emerging as a standard tool for image-guided radiotherapy (IGRT). The markers are implantable devices designed to act as reliable surrogates for imaging anatomic structures of interest. Fiducial marker techniques were originally developed in the preconformal radiotherapy era for ...
... Fiducial markers are emerging as a standard tool for image-guided radiotherapy (IGRT). The markers are implantable devices designed to act as reliable surrogates for imaging anatomic structures of interest. Fiducial marker techniques were originally developed in the preconformal radiotherapy era for ...
Imaging Modalities in Brain Tumors
... increase in the number of visible metastases is achieved by using double or triple doses of Gd [4, 9]. However, increasing the dose of contrast medium unfortunately increases imaging costs. In order to minimize the cost of the contrast agent, new sequences have been introduced as the standard dose m ...
... increase in the number of visible metastases is achieved by using double or triple doses of Gd [4, 9]. However, increasing the dose of contrast medium unfortunately increases imaging costs. In order to minimize the cost of the contrast agent, new sequences have been introduced as the standard dose m ...
Accounting for Imaging Dose: Impact of California Regulation
... High Profile Over-exposures Lead to Growing Concern ...
... High Profile Over-exposures Lead to Growing Concern ...
High-resolution investigation of spinal cord and spine
... vascular and neuronal network of SC [13], it often requires the contrast medium enhancement, it has long acquisition times. Positron Emission Tomography (micro-PET) technique is the valuable research tool for 3D viewing of brain cancers and metastases as well as for mapping normal brain function an ...
... vascular and neuronal network of SC [13], it often requires the contrast medium enhancement, it has long acquisition times. Positron Emission Tomography (micro-PET) technique is the valuable research tool for 3D viewing of brain cancers and metastases as well as for mapping normal brain function an ...
X-ray imaging: Fundamentals and planar imaging - English
... 1 Overview As it can be imagined, planar X-ray imaging has an inherent limitation in resolving overlying structures as everything seen in the images are the result of a projection. It is, however, possible to resolve the 3D distribution of X-ray attenuation from a set of projections. This is actuall ...
... 1 Overview As it can be imagined, planar X-ray imaging has an inherent limitation in resolving overlying structures as everything seen in the images are the result of a projection. It is, however, possible to resolve the 3D distribution of X-ray attenuation from a set of projections. This is actuall ...
The Evolution and Future of Radiology in the United States
... clinical specialists interpreting the same images. Furthermore, the issue of unrelated and incidental findings touches on three fundamental issues in radiologists’ interpretation of medical images that have caused widespread complaints from clinical colleagues. The first is the discovery and listing ...
... clinical specialists interpreting the same images. Furthermore, the issue of unrelated and incidental findings touches on three fundamental issues in radiologists’ interpretation of medical images that have caused widespread complaints from clinical colleagues. The first is the discovery and listing ...
Extended parallel backprojection for standard three
... Phantom definitions were taken from the phantom data base at http://www.imp.uni-erlangen.de/forbild except for the cardiac motion phantom that is defined in Ref. 30. For simulation, a 2⫻2 subsampling was used for the focal spot for the detector; integration time was simulated by subsampling the angu ...
... Phantom definitions were taken from the phantom data base at http://www.imp.uni-erlangen.de/forbild except for the cardiac motion phantom that is defined in Ref. 30. For simulation, a 2⫻2 subsampling was used for the focal spot for the detector; integration time was simulated by subsampling the angu ...
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.