17 Positron Emission Tomography in Head and Neck Cancer
... ing device. A positron transverses a few millimetres through the tissue until it combines with an electron in the surrounding media. This generates a pair of photons which travel in nearly opposite directions (180° apart) with an energy of 511 KeV each. These opposed photons can be detected by detec ...
... ing device. A positron transverses a few millimetres through the tissue until it combines with an electron in the surrounding media. This generates a pair of photons which travel in nearly opposite directions (180° apart) with an energy of 511 KeV each. These opposed photons can be detected by detec ...
Current concepts on imaging in radiotherapy
... underlined before its introduction into routine clinical practice. For example, an important disadvantage of 1H MRS is that the signals from metabolites are relatively small, so the in-vivo resolution is poor (large voxels are required to obtain an adequate signal to noise ratio): the current state ...
... underlined before its introduction into routine clinical practice. For example, an important disadvantage of 1H MRS is that the signals from metabolites are relatively small, so the in-vivo resolution is poor (large voxels are required to obtain an adequate signal to noise ratio): the current state ...
Multidetector CT/CTA
... lasts for a few minutes. Occasionally, a patient will develop itching and hives, which can be relieved with medication. If you become light‐headed or experience difficulty breathing, you should notify the technologist or nurse, as it may indicate a more severe allergic reaction. A radiologist or ...
... lasts for a few minutes. Occasionally, a patient will develop itching and hives, which can be relieved with medication. If you become light‐headed or experience difficulty breathing, you should notify the technologist or nurse, as it may indicate a more severe allergic reaction. A radiologist or ...
Simultaneous Multiparametric PET/MRI with Silicon Photomultiplier
... in numerous studies in terms of understanding the underlying mechanism of human diseases and elucidating the efficacy of new therapeutic approaches. Among the in vivo small-animal imaging modalities, which are scaled down to dedicated devices from clinical ones, PET is the most-sensitive technique t ...
... in numerous studies in terms of understanding the underlying mechanism of human diseases and elucidating the efficacy of new therapeutic approaches. Among the in vivo small-animal imaging modalities, which are scaled down to dedicated devices from clinical ones, PET is the most-sensitive technique t ...
Combined MRI-PET Scanner: A Monte Carlo Evaluation of the
... accomplished. Combining these two modalities into a single scanner would facilitate meaningful comparisons between PET and MRI data. In addition, the combination of these two imaging procedures could improve the in-plane resolution of the PET images due to the effects of a magnetic field on positron ...
... accomplished. Combining these two modalities into a single scanner would facilitate meaningful comparisons between PET and MRI data. In addition, the combination of these two imaging procedures could improve the in-plane resolution of the PET images due to the effects of a magnetic field on positron ...
PaX-i - Dentalair
... "i" stands for ‘innovation’, one of the core values of VATECH, which aims to expand accessibility of medical solutions to more people. ...
... "i" stands for ‘innovation’, one of the core values of VATECH, which aims to expand accessibility of medical solutions to more people. ...
Applications of Tomographic Imaging in Nuclear Medicine
... The overwhelming majority of imaging systems in nuclear medicine is still based on photon detection use scintillation crystals coupled to photomultiplier tubes. The advantage of inorganic scintillators that are used lies in their greater stopping power thanks to their high density and atomic number ...
... The overwhelming majority of imaging systems in nuclear medicine is still based on photon detection use scintillation crystals coupled to photomultiplier tubes. The advantage of inorganic scintillators that are used lies in their greater stopping power thanks to their high density and atomic number ...
Energy selective computed tomography: a potential revolution for
... Computed tomography (CT) imaging is a technique where a series of X-ray images, acquired at many different angles around the patient, are processed mathematically to generate a 3D map of the patient anatomy. This contributed to a revolution in diagnostic medicine, as doctors had a non-invasive techn ...
... Computed tomography (CT) imaging is a technique where a series of X-ray images, acquired at many different angles around the patient, are processed mathematically to generate a 3D map of the patient anatomy. This contributed to a revolution in diagnostic medicine, as doctors had a non-invasive techn ...
Computed tomography and MRI
... working on the concept of scanning slices of the body from various angles and rotations. But it was Hounsfield’s work on pattern recognition and the use of computers to analyse readings that made the ...
... working on the concept of scanning slices of the body from various angles and rotations. But it was Hounsfield’s work on pattern recognition and the use of computers to analyse readings that made the ...
Diagnostics
... world and became very public, and scientific fancy. Scientists everywhere would dublicate his experiment because the cathode tube was very well known in early 1896. There was then concern of potential danger, but not enough experiment was performed to suggest that X-rays would in any way be hazardou ...
... world and became very public, and scientific fancy. Scientists everywhere would dublicate his experiment because the cathode tube was very well known in early 1896. There was then concern of potential danger, but not enough experiment was performed to suggest that X-rays would in any way be hazardou ...
Free Full Text - Hellenic Society of Nuclear Medicine
... from the transmission measurement may contribute to loss of contrast on AC PET images, Inhomogeneity of data transmission may lead to a noisy background and decreasing the signal to noise ratio [19]. Furthermore, the absolute background for lesions on NAC PET images is variable, showing higher uptak ...
... from the transmission measurement may contribute to loss of contrast on AC PET images, Inhomogeneity of data transmission may lead to a noisy background and decreasing the signal to noise ratio [19]. Furthermore, the absolute background for lesions on NAC PET images is variable, showing higher uptak ...
Introducing Biograph mCT.
... unique diagnostic abilities and versatility. It’s a premium CT that provides molecular contrast and the only CT that can do routine whole-body PET·CT scans in 5 minutes. Use it for all your CT needs and for PET when you need it. ...
... unique diagnostic abilities and versatility. It’s a premium CT that provides molecular contrast and the only CT that can do routine whole-body PET·CT scans in 5 minutes. Use it for all your CT needs and for PET when you need it. ...
Radiology basics → Making X-rays Digital Imaging Radiation Safety
... Understand why improved quality control at image acquisition can improve report quality and turnaround time Know the benefits that teleradiology can provide to your practice ...
... Understand why improved quality control at image acquisition can improve report quality and turnaround time Know the benefits that teleradiology can provide to your practice ...
RAD 216 ADVANCED IMAGING MODALITIES
... beams which pass through the patient. There are no moving parts other than the table. ...
... beams which pass through the patient. There are no moving parts other than the table. ...
Three-dimensional (3D) image reconstruction
... image, is a single 2D view of total x-ray absorption through the body along a given axis. Two objects (say, bones) in front of one another will overlap in the image. By contrast, a 3D CT image gives a volumetric representation. (Earlier CT data sets were better thought of as a set of 2D cross sectio ...
... image, is a single 2D view of total x-ray absorption through the body along a given axis. Two objects (say, bones) in front of one another will overlap in the image. By contrast, a 3D CT image gives a volumetric representation. (Earlier CT data sets were better thought of as a set of 2D cross sectio ...
Consumer Guide to Imaging Modalities
... the patient to a lower dose of radiation, and is readily available in most locations. Although the relatively low cost and accessibility may be a benefit, this can potentially lead to inappropriate use with unnecessary radiation exposure and expense. In fact, x-ray imaging is not well-suited for all ...
... the patient to a lower dose of radiation, and is readily available in most locations. Although the relatively low cost and accessibility may be a benefit, this can potentially lead to inappropriate use with unnecessary radiation exposure and expense. In fact, x-ray imaging is not well-suited for all ...
Thomas C. Gerber, MD, PhD PET, SPECT, Stress Echo and MRI
... exercise with interpretable ECG: exercise ECG • Choice of imaging exercise or stress test should depend on patient-specific factors and risk, and local availability and expertise ...
... exercise with interpretable ECG: exercise ECG • Choice of imaging exercise or stress test should depend on patient-specific factors and risk, and local availability and expertise ...
DissertationProposal
... Computed Tomography (CT) and six Magnetic-Resonance (MR) volumes. On a PC, having a 2.40 GHz Intel® Core™ 2 Quad CPUs, and 4 GB DDR2 memory with NVIDIA’s GeForce 9600 GT graphic card. All CT images were registered to the MR images using the MR image as the reference image on PC Run the registration ...
... Computed Tomography (CT) and six Magnetic-Resonance (MR) volumes. On a PC, having a 2.40 GHz Intel® Core™ 2 Quad CPUs, and 4 GB DDR2 memory with NVIDIA’s GeForce 9600 GT graphic card. All CT images were registered to the MR images using the MR image as the reference image on PC Run the registration ...
Slide 1
... Differences in intensity in parts of the image corresponding to different concentrations of activity within the patient ...
... Differences in intensity in parts of the image corresponding to different concentrations of activity within the patient ...
dosgel_sur4 - University of Surrey
... Figure 3(a) shows a selected 2-D slice from the 3-D image data-set obtained from an FXG gel phantom exposed to a cone-beam of X-rays. The silver X-ray tube target was operated at 50kVp, 0.6mA and the exposure time was about 30 minutes. 128 projections, each consisting of a plane of 128128 pixels, w ...
... Figure 3(a) shows a selected 2-D slice from the 3-D image data-set obtained from an FXG gel phantom exposed to a cone-beam of X-rays. The silver X-ray tube target was operated at 50kVp, 0.6mA and the exposure time was about 30 minutes. 128 projections, each consisting of a plane of 128128 pixels, w ...
Metastatic Prostate Cancer Presenting as Acute Appendicitis: A
... their influence on the imaging properties of MRI. Asymmetric or irregular accumulation of these nanoparticles, secondary to tumor infiltration, are therefore visualized on imaging.6 Prospective studies comparing MRI with nanoparticles against a histopathologic gold standard have demonstrated patient ...
... their influence on the imaging properties of MRI. Asymmetric or irregular accumulation of these nanoparticles, secondary to tumor infiltration, are therefore visualized on imaging.6 Prospective studies comparing MRI with nanoparticles against a histopathologic gold standard have demonstrated patient ...
CLINICAL CASE - Oncology Follow-up - Revolution
... Image quality as defined by low contrast detectability. In clinical practice, the use of ASiR-V may reduce CT patient dose depending on the clinical task, patient size, anatomical location,and clinical practice. A consultation with a radiologist and a physicist should be made to determine the approp ...
... Image quality as defined by low contrast detectability. In clinical practice, the use of ASiR-V may reduce CT patient dose depending on the clinical task, patient size, anatomical location,and clinical practice. A consultation with a radiologist and a physicist should be made to determine the approp ...
Musculoskeletal Imaging for the Primary Clinician
... Very sensitive for skeletal pathology Mildly sensitive for soft tissue pathology Usually nonspecific as an isolated test Mostly patient friendly; no significant environmental exposure • Small-moderate expense ...
... Very sensitive for skeletal pathology Mildly sensitive for soft tissue pathology Usually nonspecific as an isolated test Mostly patient friendly; no significant environmental exposure • Small-moderate expense ...
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.