medical physics 2012/13
... 15. The trainee is at the centre of the STP, supported on the one hand by the national oversight role taken by the NSHCS, working closely with local quality monitoring and performance processes currently undertaken by SHAs and on the other by the day-today delivery of training in the workplace, faci ...
... 15. The trainee is at the centre of the STP, supported on the one hand by the national oversight role taken by the NSHCS, working closely with local quality monitoring and performance processes currently undertaken by SHAs and on the other by the day-today delivery of training in the workplace, faci ...
Patient Dose in common CT examinations-2003
... widely used CT Dose Quantity is the computed tomography dose index (CTDI), which integrates the long axis dose profile resulting from a single slice rotation of the x-ray tube. Another important dose quantity is the Dose Length Product (DLP), which includes the patient, or the phantom volume irradia ...
... widely used CT Dose Quantity is the computed tomography dose index (CTDI), which integrates the long axis dose profile resulting from a single slice rotation of the x-ray tube. Another important dose quantity is the Dose Length Product (DLP), which includes the patient, or the phantom volume irradia ...
Contents
... In this thesis the focus will be on another area of use for the EPID, namely that of dosimetric verification of treatment fields. The idea is to calibrate the detector to give pixel values proportional to dose, so that a portal dose image (PDI) is obtained. To calibrate the EPID for dosimetry requir ...
... In this thesis the focus will be on another area of use for the EPID, namely that of dosimetric verification of treatment fields. The idea is to calibrate the detector to give pixel values proportional to dose, so that a portal dose image (PDI) is obtained. To calibrate the EPID for dosimetry requir ...
Computed Tomography Radiation Safety Issues in Ontario
... results is provided in Appendix 2. Interviews and Site Visits For each of the four 64-slice CT scanner manufacturers, a site visit was made to a healthcare institution that installed at least one of their 64-slice CT scanners. Interviews were also conducted with radiologists, interventional radiolog ...
... results is provided in Appendix 2. Interviews and Site Visits For each of the four 64-slice CT scanner manufacturers, a site visit was made to a healthcare institution that installed at least one of their 64-slice CT scanners. Interviews were also conducted with radiologists, interventional radiolog ...
Quality assurance for computed-tomography simulators and the
... rather establishes a set of QA procedures that are applicable to scanners used for CT-simulation regardless of their location and primary purpose. It is the responsibility of the respective diagnostic and therapy physicists to determine how the QA program is implemented and how the responsibilities ...
... rather establishes a set of QA procedures that are applicable to scanners used for CT-simulation regardless of their location and primary purpose. It is the responsibility of the respective diagnostic and therapy physicists to determine how the QA program is implemented and how the responsibilities ...
clinical studies - Neurochirurgisch Centrum Amsterdam
... showed full spontaneous recovery; the other two had avulsions of C7 and lesions in continuity of the superior trunk. Intraoperative direct SSEPs from C7 roots in the operative patients showed five positive recordings, even in two confirmed avulsions (Patients 1 and 5) (Tables 2 and 5). Direct electr ...
... showed full spontaneous recovery; the other two had avulsions of C7 and lesions in continuity of the superior trunk. Intraoperative direct SSEPs from C7 roots in the operative patients showed five positive recordings, even in two confirmed avulsions (Patients 1 and 5) (Tables 2 and 5). Direct electr ...
International Workshop on Monte Carlo Techniques in Medical
... artificial implants from CAD modeling (screws, hip replacements, brachytherapy seeds, etc) or anatomical details extracted from other imaging modalities, such as for example MRI (arteries, spinal cord, atheroma, etc). A potential solution based on the use of smaller voxels for modeling complex objec ...
... artificial implants from CAD modeling (screws, hip replacements, brachytherapy seeds, etc) or anatomical details extracted from other imaging modalities, such as for example MRI (arteries, spinal cord, atheroma, etc). A potential solution based on the use of smaller voxels for modeling complex objec ...
Cone Beam Computed Tomography for Adaptive
... (14.5%) observed for head and neck patients [4]. For bone inhomogeneities, the difference in dose goes up to 20% for two different beam energies [16]. Other approaches for using CBCT datasets generate specific HU-density tables [4]. HU values of PCT have been mapped with CBCT geometry using pixel co ...
... (14.5%) observed for head and neck patients [4]. For bone inhomogeneities, the difference in dose goes up to 20% for two different beam energies [16]. Other approaches for using CBCT datasets generate specific HU-density tables [4]. HU values of PCT have been mapped with CBCT geometry using pixel co ...
The Clinical Value of Diffusion-Weighted Imaging in Combination
... correlation coefficient (between the logit of sensitivity and logit of specificity) for T2WI combined with DWI. If no threshold effect existed in the meta-analysis, metaregression analysis was then performed to explore other sources of heterogeneity in the studies for T2WI combined with DWI. We appl ...
... correlation coefficient (between the logit of sensitivity and logit of specificity) for T2WI combined with DWI. If no threshold effect existed in the meta-analysis, metaregression analysis was then performed to explore other sources of heterogeneity in the studies for T2WI combined with DWI. We appl ...
25 Image-Guided/Adaptive Radiotherapy
... a consistent discrepancy between the patient/organ shape and position appearing in pre-treatment simulation/planning and that at treatment delivery; therefore, it is also called treatment preparation error (Van Herk et al. 2000). The random component represents patient/organ shape and position varia ...
... a consistent discrepancy between the patient/organ shape and position appearing in pre-treatment simulation/planning and that at treatment delivery; therefore, it is also called treatment preparation error (Van Herk et al. 2000). The random component represents patient/organ shape and position varia ...
Measurement of Subfoveal Choroidal Thickness Using Spectral
... for age. However, this result was not statistically significant due to the high standard error. This is probably best explained by the very strong relationship that both AMD and choroidal thickness have with age. Thus, a higher powered study may prove AMD and age to be additive in the future. Eyes w ...
... for age. However, this result was not statistically significant due to the high standard error. This is probably best explained by the very strong relationship that both AMD and choroidal thickness have with age. Thus, a higher powered study may prove AMD and age to be additive in the future. Eyes w ...
Technical assessment of a cone-beam CT scanner
... mSv) and to permit comparison to other systems for which results have been reported only in terms of effective dose (mSv), we used the tissue conversion factor for the head (kHead = 0.0023 mSv/mGy/cm) given by ICRP Publication 10326 and computed DE = kHead · DLP. The limitation and approximation of ...
... mSv) and to permit comparison to other systems for which results have been reported only in terms of effective dose (mSv), we used the tissue conversion factor for the head (kHead = 0.0023 mSv/mGy/cm) given by ICRP Publication 10326 and computed DE = kHead · DLP. The limitation and approximation of ...
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 ...
MEDICAL IMAGING/ RADIOGRAPHY STUDENT HANDBOOK 2016
... Becoming a Radiographer is a challenging but rewarding process. This Radiography Student Handbook has been prepared by the CSCC Medical Imaging Program to guide you through your training in class and clinical, and to orient you to the services available as a student at Columbus State. This handbook ...
... Becoming a Radiographer is a challenging but rewarding process. This Radiography Student Handbook has been prepared by the CSCC Medical Imaging Program to guide you through your training in class and clinical, and to orient you to the services available as a student at Columbus State. This handbook ...
Incidence, Morphology, Angiographic Findings, and
... novo lesions. The location of the hematomas was the right coronary artery in 47% (34 of 72), left anterior descending artery in 29% (21 of 72), and left circumflex artery in 24% (17 of 72). In 3 right coronary arteries, there were 2 separate intramural hematomas. The hematoma was located in the prox ...
... novo lesions. The location of the hematomas was the right coronary artery in 47% (34 of 72), left anterior descending artery in 29% (21 of 72), and left circumflex artery in 24% (17 of 72). In 3 right coronary arteries, there were 2 separate intramural hematomas. The hematoma was located in the prox ...
PDF - Medical Journal of Australia
... Attempts at histological characterisation can be problematic in patients with cancer. The availability of anatomical information from PET/CT can assist in selecting the most accessible mass for biopsy. After treatment, residual masses may not contain any active tumour, and the presence of residual u ...
... Attempts at histological characterisation can be problematic in patients with cancer. The availability of anatomical information from PET/CT can assist in selecting the most accessible mass for biopsy. After treatment, residual masses may not contain any active tumour, and the presence of residual u ...
Tomographic Imaging on a Cobalt Radiotherapy Machine Matthew Brendon Marsh
... tungsten or depleted uranium, and is exposed by moving the source into alignment with an opening in the shield. Sources are typically replaced after approximately one half-life. Most modern teletherapy equipment does not use radioactive sources. Rather, a particle accelerator– usually a linear accel ...
... tungsten or depleted uranium, and is exposed by moving the source into alignment with an opening in the shield. Sources are typically replaced after approximately one half-life. Most modern teletherapy equipment does not use radioactive sources. Rather, a particle accelerator– usually a linear accel ...
1452 K - Iranian Journal of Nuclear Medicine
... Manuscripts are considered with the understanding that they are submitted solely to the "Iran J Nucl Med" and have not been published elsewhere previously either in print or electronic format, and are not under consideration by another publication or electronic medium. Submission of an article for p ...
... Manuscripts are considered with the understanding that they are submitted solely to the "Iran J Nucl Med" and have not been published elsewhere previously either in print or electronic format, and are not under consideration by another publication or electronic medium. Submission of an article for p ...
The American College of Radiology, with more than 30,000
... The practice of medicine involves not only the science, but also the art of dealing with the prevention, diagnosis, alleviation, and treatment of disease. The variety and complexity of human conditions make it impossible to always reach the most appropriate diagnosis or to predict with certainty a p ...
... The practice of medicine involves not only the science, but also the art of dealing with the prevention, diagnosis, alleviation, and treatment of disease. The variety and complexity of human conditions make it impossible to always reach the most appropriate diagnosis or to predict with certainty a p ...
Developmental nasal midline masses in children: neuroradiological
... or fibrous stalk is tested negative for ectodermal or neurogenic elements on multiple histological sections [24, 25]. Obviously, these results cannot exclude non-connected coexisting intracranial components; therefore, the consequences of these considerations are that the false-positive MRI findings ...
... or fibrous stalk is tested negative for ectodermal or neurogenic elements on multiple histological sections [24, 25]. Obviously, these results cannot exclude non-connected coexisting intracranial components; therefore, the consequences of these considerations are that the false-positive MRI findings ...
ACR Practice Guideline for Performing FDG
... practice and are not intended, nor should they be used, to establish a legal standard of care. For these reasons and those set forth below, the American College of Radiology cautions against the use of these guidelines in litigation in which the clinical decisions of a practitioner are called into q ...
... practice and are not intended, nor should they be used, to establish a legal standard of care. For these reasons and those set forth below, the American College of Radiology cautions against the use of these guidelines in litigation in which the clinical decisions of a practitioner are called into q ...
Techniques and Applications of Automatic Tube Current Modulation
... rotates around the patient, emitting x-rays that traverse through a cross section of the body to generate attenuation profiles (image raw data) at the detectors. Thus, incident x-ray beam projections from multiple directions around the region of interest are used to reconstruct each cross-sectional ...
... rotates around the patient, emitting x-rays that traverse through a cross section of the body to generate attenuation profiles (image raw data) at the detectors. Thus, incident x-ray beam projections from multiple directions around the region of interest are used to reconstruct each cross-sectional ...
Multidetector CT-generated virtual bronchoscopy: an illustrated review
... from the inside of an anatomical structure, such as the inner wall of the colon, trachea or abdominal aorta. This insideview is generated step by step, creating a film at the end-point. The thickness of each step is 2 mm. The images are orientated with the posterior side at 12 o9clock, the left side ...
... from the inside of an anatomical structure, such as the inner wall of the colon, trachea or abdominal aorta. This insideview is generated step by step, creating a film at the end-point. The thickness of each step is 2 mm. The images are orientated with the posterior side at 12 o9clock, the left side ...
molecular imaging center, nirs
... Molecular imaging is a discipline that enables the non-invasive visualization of molecular behavior in the living body. It is a newly emerging field of study that combines molecular biology techniques for the investigation of molecular functions in the living body and the technology for the visualiz ...
... Molecular imaging is a discipline that enables the non-invasive visualization of molecular behavior in the living body. It is a newly emerging field of study that combines molecular biology techniques for the investigation of molecular functions in the living body and the technology for the visualiz ...
Neutron capture therapy of cancer
Neutron capture therapy (NCT) is a noninvasive therapeutic modality for treating locally invasive malignant tumors such as primary brain tumors and recurrent head and neck cancer. It is a two step procedure: first, the patient is injected with a tumor localizing drug containing a non-radioactive isotope that has a high propensity or cross section (σ) to capture slow neutrons. The cross section of the capture agent is many times greater than that of the other elements present in tissues such as hydrogen, oxygen, and nitrogen. In the second step, the patient is radiated with epithermal neutrons, which after losing energy as they penetrate tissue, are absorbed by the capture agent which subsequently emits high-energy charged particles, thereby resulting in a biologically destructive nuclear reaction (Fig.1).All of the clinical experience to date with NCT is with the non-radioactive isotope boron-10, and this is known as boron neutron capture therapy (BNCT). At this time, the use of other non-radioactive isotopes, such as gadolinium, has been limited, and to date, it has not been used clinically. BNCT has been evaluated clinically as an alternative to conventional radiation therapy for the treatment of malignant brain tumors (gliomas), and more recently, recurrent, locally advanced head and neck cancer.