X-ray-based attenuation correction for positron emission
... energies corresponding to the ejection of specific innershell electrons from the atom following photon absorption. In comparison, the linear attenuation coefficient for Compton scattering is directly proportional to Z and has a slight inverse dependence (albeit nonlinear) on photon energy between 10 ...
... energies corresponding to the ejection of specific innershell electrons from the atom following photon absorption. In comparison, the linear attenuation coefficient for Compton scattering is directly proportional to Z and has a slight inverse dependence (albeit nonlinear) on photon energy between 10 ...
Image Quality and Dose Evaluation of Filtered Back Projection
... edge-spread function.(b) Simulated degraded-output images showing raw image data used for the measurements of the PSF, LSF and ESF. The blurring seen in these functions is due to the imperfect resolution properties of the imaging system being characterized.(c) Graphs showing the actual PSF, LSF and ...
... edge-spread function.(b) Simulated degraded-output images showing raw image data used for the measurements of the PSF, LSF and ESF. The blurring seen in these functions is due to the imperfect resolution properties of the imaging system being characterized.(c) Graphs showing the actual PSF, LSF and ...
- University of Salford Institutional Repository
... types, children are more susceptible than adults, and for 20% of tumour types the data is inconclusive5. It has been estimated that a one year old child is as much as ten times more susceptible to radiation-induced cancer than an adult4. In recent years, based on the steadily increasing use of CT, m ...
... types, children are more susceptible than adults, and for 20% of tumour types the data is inconclusive5. It has been estimated that a one year old child is as much as ten times more susceptible to radiation-induced cancer than an adult4. In recent years, based on the steadily increasing use of CT, m ...
Novel Techniques for Integrating Video Augmented X
... I would like to express special thanks to our medical collaboration partners, in particular Dr. med. Simon Weidert for his active collaboration, insightful medical advice and invaluable contribution, resulting in many joint publications throughout my entire PhD work; Dr. med. Sandro M. Heining for i ...
... I would like to express special thanks to our medical collaboration partners, in particular Dr. med. Simon Weidert for his active collaboration, insightful medical advice and invaluable contribution, resulting in many joint publications throughout my entire PhD work; Dr. med. Sandro M. Heining for i ...
Synchrotron x-ray imaging of pulmonary alveoli in respiration in live
... therefore limited to alveoli at lung apices or subpleural alveoli under open thorax conditions. Here we report direct and real-time visualization of alveoli of live intact mice during respiration using tracking X-ray microscopy. Our studies, for the first time, determine the alveolar size of normal ...
... therefore limited to alveoli at lung apices or subpleural alveoli under open thorax conditions. Here we report direct and real-time visualization of alveoli of live intact mice during respiration using tracking X-ray microscopy. Our studies, for the first time, determine the alveolar size of normal ...
Progeny Vantage Panoramic X-ray System
... Setting the Height of the Vantage System .............................................................................................. 66 Inserting the Chin Rest and Bite Guide .................................................................................................. 67 Inserting the TMJ Po ...
... Setting the Height of the Vantage System .............................................................................................. 66 Inserting the Chin Rest and Bite Guide .................................................................................................. 67 Inserting the TMJ Po ...
International Workshop on Monte Carlo Techniques in Medical
... animals, enabling the study of models for radiation response of normal tissue and tumors. Novel image-guided precision irradiators are now available that greatly facilitate this. They also enable studies of synergies of e.g. drugs and radiation. In this work we will give an overview of the role of M ...
... animals, enabling the study of models for radiation response of normal tissue and tumors. Novel image-guided precision irradiators are now available that greatly facilitate this. They also enable studies of synergies of e.g. drugs and radiation. In this work we will give an overview of the role of M ...
Evaluation of the Three Dimensional Localization
... mm. With the dosimetric accuracy of treatment delivery, the average minimum dose, mean dose, and maximum dose in PTV of the original plans and the CBCT-based plans were 95.45% ± 3.80% and 92.88% ± 3.25%, 110.59% ± 1.81% and 110.11%±2.40%, 116.55%±3.11% and 115.93%±2.78%, respectively. In the origin ...
... mm. With the dosimetric accuracy of treatment delivery, the average minimum dose, mean dose, and maximum dose in PTV of the original plans and the CBCT-based plans were 95.45% ± 3.80% and 92.88% ± 3.25%, 110.59% ± 1.81% and 110.11%±2.40%, 116.55%±3.11% and 115.93%±2.78%, respectively. In the origin ...
-1 - 1. Introduction: The specialty of radiology has grown enormously
... By completion of the educational program, the graduate physician will be competent to function as a specialist in Diagnostic Radiology. The physician will be able to advise on, supervise, and perform the imaging procedures to such a level of competence, and across a broad range of radiological pract ...
... By completion of the educational program, the graduate physician will be competent to function as a specialist in Diagnostic Radiology. The physician will be able to advise on, supervise, and perform the imaging procedures to such a level of competence, and across a broad range of radiological pract ...
Contrast medium administration and image acquisition parameters
... rates have been known to increase the risk of extravasation (30). Injection rates used in renal CTA range between 4–6 mL/s since faster injection rates are necessary with faster scanners. Contrast media volume. Continual efforts have been made to provide patient-specific contrast administration. The ...
... rates have been known to increase the risk of extravasation (30). Injection rates used in renal CTA range between 4–6 mL/s since faster injection rates are necessary with faster scanners. Contrast media volume. Continual efforts have been made to provide patient-specific contrast administration. The ...
Radiation exposure and thyroid cancer: a review
... (3,14). The prevalence of hypothyroidism, thyroid nodules, and thyroid carcinoma in exposed subjects increased with the radiation dose to the thyroid gland. Females were at a higher risk (3.7 fold) of developing a thyroid nodule than males, and the risk decreased with increasing age at exposure. In ...
... (3,14). The prevalence of hypothyroidism, thyroid nodules, and thyroid carcinoma in exposed subjects increased with the radiation dose to the thyroid gland. Females were at a higher risk (3.7 fold) of developing a thyroid nodule than males, and the risk decreased with increasing age at exposure. In ...
ICRP Publication 105
... unique considerations that affect how the fundamental principles are applied. Dose limits are not at all relevant, since ionising radiation, used at the appropriate level of dose for the particular medical purpose, is an essential tool that will cause more good than harm. Justification in radiological ...
... unique considerations that affect how the fundamental principles are applied. Dose limits are not at all relevant, since ionising radiation, used at the appropriate level of dose for the particular medical purpose, is an essential tool that will cause more good than harm. Justification in radiological ...
Breast Microcalcifications - Diagnostic Centers of America
... An ACR Committee on Appropriateness Criteria and its expert panels have developed criteria for determining appropriate imaging examinations for diagnosis and treatment of specified medical condition(s). These criteria are intended to guide radiologists, radiation oncologists, and referring physician ...
... An ACR Committee on Appropriateness Criteria and its expert panels have developed criteria for determining appropriate imaging examinations for diagnosis and treatment of specified medical condition(s). These criteria are intended to guide radiologists, radiation oncologists, and referring physician ...
Reduction of CT dose for CT-based PET attenuation correction
... 1.1 PET/CT for cancer imaging ..............................................................1 1.2 PET quantitation in oncology ............................................................3 1.2.1 Limitations of conventional techniques for evaluation of early response to therapy .................... ...
... 1.1 PET/CT for cancer imaging ..............................................................1 1.2 PET quantitation in oncology ............................................................3 1.2.1 Limitations of conventional techniques for evaluation of early response to therapy .................... ...
radiation medicine qa
... (Dr. Pychlau’s supervisor (annotation of the translator)) in the street. He invited me to have a look at what he had been doing in the meantime and told me about his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friends ...
... (Dr. Pychlau’s supervisor (annotation of the translator)) in the street. He invited me to have a look at what he had been doing in the meantime and told me about his having set up a business for the production of his invention, a dosemeter based on an electrostatic relay. It was out of sheer friends ...
Evaluation of phantoms used in image quality performance testing of
... coronal images. 3D images of the area of interest can be also formed by stacking the reconstructed 2D images. CT is one of the most common imaging procedures requested by physicians in the United States. About 67 million CT scans were performed in the year of 2006 in the United States (NRCP report N ...
... coronal images. 3D images of the area of interest can be also formed by stacking the reconstructed 2D images. CT is one of the most common imaging procedures requested by physicians in the United States. About 67 million CT scans were performed in the year of 2006 in the United States (NRCP report N ...
On the Feasibility of Quantitative Dynamic Whole
... whole-body PET/CT3,4 utilizing short (e.g., 45 seconds/bed) PET scans to obtain whole body (WB) PET images within 5-6 minutes, allowing for serial multi-pass PET imaging. The purpose of this project is to evaluate the feasibility of dynamic WB (DWB) FDG PET/MR, which may have following advantages: ( ...
... whole-body PET/CT3,4 utilizing short (e.g., 45 seconds/bed) PET scans to obtain whole body (WB) PET images within 5-6 minutes, allowing for serial multi-pass PET imaging. The purpose of this project is to evaluate the feasibility of dynamic WB (DWB) FDG PET/MR, which may have following advantages: ( ...
View - OhioLINK ETD
... coronal images. 3D images of the area of interest can be also formed by stacking the reconstructed 2D images. CT is one of the most common imaging procedures requested by physicians in the United States. About 67 million CT scans were performed in the year of 2006 in the United States (NRCP report N ...
... coronal images. 3D images of the area of interest can be also formed by stacking the reconstructed 2D images. CT is one of the most common imaging procedures requested by physicians in the United States. About 67 million CT scans were performed in the year of 2006 in the United States (NRCP report N ...
Structure of the Atom - The American Association of Physicists in
... Q4. The absorbed dose to the ovaries from a limited CT exam of 8 cm length, with a 2 cm thickness contiguous acquisition with the ovaries in the beam, is 8 mGy. If the study is expanded in length to cover 16 cm instead, which of the following descriptors of dose is correct? A. The dose to the ovarie ...
... Q4. The absorbed dose to the ovaries from a limited CT exam of 8 cm length, with a 2 cm thickness contiguous acquisition with the ovaries in the beam, is 8 mGy. If the study is expanded in length to cover 16 cm instead, which of the following descriptors of dose is correct? A. The dose to the ovarie ...
Radiological Protection in Cone Beam Computed Tomography
... recommendations and guidance on application of principles of radiological protection it establishes. This has been done through specific publications on the various uses of ionising radiation in medicine in various imaging and therapeutic modalities. This is in addition to the reports published by t ...
... recommendations and guidance on application of principles of radiological protection it establishes. This has been done through specific publications on the various uses of ionising radiation in medicine in various imaging and therapeutic modalities. This is in addition to the reports published by t ...
PDF - Medical Journal of Australia
... using radioactive sources in a process which increases the duration of the scan by about 30%. Furthermore, as PET images contain limited anatomical information, physiological uptake into the heart, skeletal muscle and gut can cause diagnostic dilemmas. Increased uptake in inflammatory and other non- ...
... using radioactive sources in a process which increases the duration of the scan by about 30%. Furthermore, as PET images contain limited anatomical information, physiological uptake into the heart, skeletal muscle and gut can cause diagnostic dilemmas. Increased uptake in inflammatory and other non- ...
Characterization of the homogeneous tissue mixture approximation
... the use of dose estimates in absolute terms, such as for risk estimates, and may impact some comparative studies, such as when modalities or techniques with different x-ray energies are used. The error introduced by the homogeneous tissue mixture approximation in higher energy x-ray modalities, such ...
... the use of dose estimates in absolute terms, such as for risk estimates, and may impact some comparative studies, such as when modalities or techniques with different x-ray energies are used. The error introduced by the homogeneous tissue mixture approximation in higher energy x-ray modalities, such ...
CONE BEAM COMPUTED TOMOGRAPHY THREE-DIMENSIONAL RECONSTRUCTION FOR EVALUATION OF THE MANDIBULAR CONDYLE
... evaluations, such as computed tomography (CT) and magnetic resonance imaging (MRI), have been utilized to some degree; however, historically, high cost,3,4 large radiation dosage,5,6 large space requirements,3,4 and the high level of skill required for interpretation have kept its use to a minimum. ...
... evaluations, such as computed tomography (CT) and magnetic resonance imaging (MRI), have been utilized to some degree; however, historically, high cost,3,4 large radiation dosage,5,6 large space requirements,3,4 and the high level of skill required for interpretation have kept its use to a minimum. ...
Chapter 11: Computed Tomography - Human Health Campus
... In the back projection methodologies developed for CT reconstruction algorithms, this is generally not implemented • Instead typically a pragmatic solution is to assume where Beer’s law can be applied using one value representing the average photon energy of the X ray spectrum. This assumption cause ...
... In the back projection methodologies developed for CT reconstruction algorithms, this is generally not implemented • Instead typically a pragmatic solution is to assume where Beer’s law can be applied using one value representing the average photon energy of the X ray spectrum. This assumption cause ...
A New Approach for the Enhancement of Dual
... Since its introduction in 1972, CT technology has been improved dramatically, especially in terms of its acquisition speed. However, the main principle of CT which consists in acquiring only density information has not changed at all until recently. Different materials may have the same CT number, w ...
... Since its introduction in 1972, CT technology has been improved dramatically, especially in terms of its acquisition speed. However, the main principle of CT which consists in acquiring only density information has not changed at all until recently. Different materials may have the same CT number, w ...
Backscatter X-ray
Backscatter X-ray is an advanced X-ray imaging technology. Traditional X-ray machines detect hard and soft materials by the variation in transmission through the target. In contrast, backscatter X-ray detects the radiation that reflects from the target. It has potential applications where less-destructive examination is required, and can be used if only one side of the target is available for examination.The technology is one of two types of whole body imaging technologies that have been used to perform full-body scans of airline passengers to detect hidden weapons, tools, liquids, narcotics, currency, and other contraband. A competing technology is millimeter wave scanner. An airport security machine of this type is also referred to as ""body scanner"", ""whole body imager (WBI)"", ""security scanner"", and ""naked scanner"".