2015-2016 Digest of Council Actions
... 8. Standardization of Relative Exposure Unit of Measure for Digital Diagnostic Radiologic Equipment ... 25 ...
... 8. Standardization of Relative Exposure Unit of Measure for Digital Diagnostic Radiologic Equipment ... 25 ...
3D dose verification for advanced radiotherapy
... overview on the use of electronic portal imaging devices (EPIDs) for (pre-)treatment dosimetry is presented in Chapter 2, where a review of published methods of performing dosimetry with EPIDs is given. This review focuses on the dosimetric characteristics of EPIDs, the various ways of calibrating a ...
... overview on the use of electronic portal imaging devices (EPIDs) for (pre-)treatment dosimetry is presented in Chapter 2, where a review of published methods of performing dosimetry with EPIDs is given. This review focuses on the dosimetric characteristics of EPIDs, the various ways of calibrating a ...
PDF hosted at the Radboud Repository of the Radboud University
... In the early 1930s, conventional frontal and lateral cephalometric radiographs were added 3,4 to the orthodontic record collection, which provided insight into the underlying bony structures and superseded the need for impressions for facial plaster casts. The original idea of measuring faces came f ...
... In the early 1930s, conventional frontal and lateral cephalometric radiographs were added 3,4 to the orthodontic record collection, which provided insight into the underlying bony structures and superseded the need for impressions for facial plaster casts. The original idea of measuring faces came f ...
the quantification of cr and dr image quality and patient dose for
... 1-10 Imaged and reconstructed planes in multi-slice CT. ................................................15 1-11 Image contrast. .........................................................................................................16 1-12 Linear response of input exposure to pixel value........... ...
... 1-10 Imaged and reconstructed planes in multi-slice CT. ................................................15 1-11 Image contrast. .........................................................................................................16 1-12 Linear response of input exposure to pixel value........... ...
Lecture 8 - Mammography and tomosynthesis
... inherent contrast, but 100 μm or less in diameter – Demonstrate low contrast masses within the breast tissue – these may be relatively large, but are often very low contrast as glandular and adipose tissue have very similar atomic number (7.4 and 6.5, respectively) ...
... inherent contrast, but 100 μm or less in diameter – Demonstrate low contrast masses within the breast tissue – these may be relatively large, but are often very low contrast as glandular and adipose tissue have very similar atomic number (7.4 and 6.5, respectively) ...
Mammography and tomosynthesis
... inherent contrast, but 100 μm or less in diameter – Demonstrate low contrast masses within the breast tissue – these may be relatively large, but are often very low contrast as glandular and adipose tissue have very similar atomic number (7.4 and 6.5, respectively) ...
... inherent contrast, but 100 μm or less in diameter – Demonstrate low contrast masses within the breast tissue – these may be relatively large, but are often very low contrast as glandular and adipose tissue have very similar atomic number (7.4 and 6.5, respectively) ...
Biologically conformal radiation therapy and Monte
... The development of radiation therapy treatment planning has always relied strongly on the available imaging technologies. Anatomical imaging techniques like computed tomography (CT) can visualize spatial changes in physical properties within patients. Additionally, tumor biology plays an important r ...
... The development of radiation therapy treatment planning has always relied strongly on the available imaging technologies. Anatomical imaging techniques like computed tomography (CT) can visualize spatial changes in physical properties within patients. Additionally, tumor biology plays an important r ...
portal dosimetry in radiotherapy
... Diodes, thermoluminescent dosimeters (TLDs) and metal oxide semiconductor field‐effect transistors (MOSFETs)15‐18 are point detectors, only allowing a single point measurement. However, these detectors have a long history of clinical use, their dosimetric characteristics are ...
... Diodes, thermoluminescent dosimeters (TLDs) and metal oxide semiconductor field‐effect transistors (MOSFETs)15‐18 are point detectors, only allowing a single point measurement. However, these detectors have a long history of clinical use, their dosimetric characteristics are ...
European Guidelines on DRLs for Paediatric Imaging
... Diagnostic reference levels (DRLs) have been recommended by the International Commission on Radiological Protection (ICRP) (ICRP, 1991; 1996; 2001; 2007a; 2007b; 2013) as an advisory measure to improve optimization of patient protection, by identifying high patient dose levels which might not be jus ...
... Diagnostic reference levels (DRLs) have been recommended by the International Commission on Radiological Protection (ICRP) (ICRP, 1991; 1996; 2001; 2007a; 2007b; 2013) as an advisory measure to improve optimization of patient protection, by identifying high patient dose levels which might not be jus ...
1 - Portfoliocommunities
... Computed Tomography (CT) is sometimes called a CAT scan. It was the first digital imaging method, developed in the 1970’s. The images, tomograms, represent slices of tissue, some as thin as a millimeter. ...
... Computed Tomography (CT) is sometimes called a CAT scan. It was the first digital imaging method, developed in the 1970’s. The images, tomograms, represent slices of tissue, some as thin as a millimeter. ...
PDF - IAEA Publications
... FOREWORD Radiotherapy is a key treatment modality for cancer patients. In recent years, there have been major developments in external beam radiotherapy, which has developed from simple two dimensional techniques to three dimensional image based conformal radiotherapy, intensity modulated radiother ...
... FOREWORD Radiotherapy is a key treatment modality for cancer patients. In recent years, there have been major developments in external beam radiotherapy, which has developed from simple two dimensional techniques to three dimensional image based conformal radiotherapy, intensity modulated radiother ...
cone beam ct: non-dental applications
... (white arrows). The sinuses are incompletely visualized and the OMU cannot be assessed. B: CBCT of the sinuses performed 6 weeks later after a sinus lifting procedure was performed on both sides. On the left side the procedure is complicated by infection (black arrow) and the complete sinus is infla ...
... (white arrows). The sinuses are incompletely visualized and the OMU cannot be assessed. B: CBCT of the sinuses performed 6 weeks later after a sinus lifting procedure was performed on both sides. On the left side the procedure is complicated by infection (black arrow) and the complete sinus is infla ...
The Influence of Accurate Attenuation Correction - ORCA
... projection images acquired at a sufficient number of positions around the object being imaged. The projection images are generally acquired along an arc spanning at least 180°. This reconstruction may be carried out using filtered back projection or iterative reconstruction techniques as described i ...
... projection images acquired at a sufficient number of positions around the object being imaged. The projection images are generally acquired along an arc spanning at least 180°. This reconstruction may be carried out using filtered back projection or iterative reconstruction techniques as described i ...
Anniversary Paper: Development of x
... Image artifacts also occupied an important body of early research. The deleterious effect of the polychromatic spectrum of conventional x-ray sources on CT image quality— the so-called beam hardening effect—was recognized and described early in this era, along with a number of correction algorithms. ...
... Image artifacts also occupied an important body of early research. The deleterious effect of the polychromatic spectrum of conventional x-ray sources on CT image quality— the so-called beam hardening effect—was recognized and described early in this era, along with a number of correction algorithms. ...
IOSR Journal of Dental and Medical Sciences (IOSR-JDMS)
... helical-CT units were not originally developed for this purpose. The problems in adapting helical-CT scans for dental use include: high cost, large space requirement, long scanning time, high radiation exposure, and low resolution in the longitudinal direction compared with it‟s relatively high reso ...
... helical-CT units were not originally developed for this purpose. The problems in adapting helical-CT scans for dental use include: high cost, large space requirement, long scanning time, high radiation exposure, and low resolution in the longitudinal direction compared with it‟s relatively high reso ...
Assessing The Clinical Application Of The Van Herk Margin Formula
... Margaret Hospital where I was provided with the resources required to conduct this thesis project. His invaluable advice and experienced opinion was a key necessity in my success and it was a privilege to work for him. ...
... Margaret Hospital where I was provided with the resources required to conduct this thesis project. His invaluable advice and experienced opinion was a key necessity in my success and it was a privilege to work for him. ...
A Monte Carlo based three-dimensional dose reconstruction
... possible differences add up in the total dose delivered. EPIDs can be used for the geometric verification of the patient position, of the multileaf collimator 共MLC兲 setting or of the leaf trajectory control, but also for dosimetry purposes. If the EPID, which is attached permanently to the linear ac ...
... possible differences add up in the total dose delivered. EPIDs can be used for the geometric verification of the patient position, of the multileaf collimator 共MLC兲 setting or of the leaf trajectory control, but also for dosimetry purposes. If the EPID, which is attached permanently to the linear ac ...
examination handbook
... Exam Disclosure Disclosing exam information using language that is substantially similar to that used in questions and/or answers on the ARRT exams is considered an attempt to subvert the integrity of the exam when such information is gained as a direct result of having been a candidate. This includ ...
... Exam Disclosure Disclosing exam information using language that is substantially similar to that used in questions and/or answers on the ARRT exams is considered an attempt to subvert the integrity of the exam when such information is gained as a direct result of having been a candidate. This includ ...
Reduction of CT dose for CT-based PET attenuation correction
... PET CTAC. The impact of these methods on PET quantitation is evaluated through simulations on different digital phantoms. When CT is not used for diagnostic and anatomical localization purposes, it is shown that ultra-low dose CT for PET/CT is feasible. The noise and bias propagation from DECT acqui ...
... PET CTAC. The impact of these methods on PET quantitation is evaluated through simulations on different digital phantoms. When CT is not used for diagnostic and anatomical localization purposes, it is shown that ultra-low dose CT for PET/CT is feasible. The noise and bias propagation from DECT acqui ...
State Licensing Handbook - The American Registry of Radiologic
... Exam Disclosure Disclosing exam information using language that is substantially similar to that used in questions and/or answers on the ARRT exams is considered an attempt to subvert the integrity of the exam when such information is gained as a direct result of having been a candidate. This includ ...
... Exam Disclosure Disclosing exam information using language that is substantially similar to that used in questions and/or answers on the ARRT exams is considered an attempt to subvert the integrity of the exam when such information is gained as a direct result of having been a candidate. This includ ...
May 2011 - American College of Radiology
... reductions both legislatively and through the regulatory process for several years. These payment reductions are making it increasingly difficult, even impossible, for many radiologists to keep their offices and freestanding imaging centers open in an environment of steadily increasing practice cost ...
... reductions both legislatively and through the regulatory process for several years. These payment reductions are making it increasingly difficult, even impossible, for many radiologists to keep their offices and freestanding imaging centers open in an environment of steadily increasing practice cost ...
Reducing Radiation Dose to the Female Breast During
... spend valuable time discussing ideas, concepts, results, and questions this work would not have been possible. For their constant consultancy along the way, especially their helpful responses to so many questions regarding Monte Carlo simulations and image quality metrics, I thank my friends and men ...
... spend valuable time discussing ideas, concepts, results, and questions this work would not have been possible. For their constant consultancy along the way, especially their helpful responses to so many questions regarding Monte Carlo simulations and image quality metrics, I thank my friends and men ...
American Association of Physicists in Medicine 40th Annual
... A and B. Blocks C and D correspond primarily to the scientific sessions, however there is an occasional symposium in these time blocks as well. Block E is reserved primarily to the afternoon symposia, however occasionally scientific sessions may be in these time blocks as well. In general, Tracks 1 ...
... A and B. Blocks C and D correspond primarily to the scientific sessions, however there is an occasional symposium in these time blocks as well. Block E is reserved primarily to the afternoon symposia, however occasionally scientific sessions may be in these time blocks as well. In general, Tracks 1 ...
Calculation, verification and monitoring of patient dose in Diagnostic
... Routine Coronary Angiography is a relatively high dose diagnostic procedure. The results from a diagnostic procedure may indicate the need for an interventional examination, which has the potential for even higher patient dose. Doses for these procedures are monitored via an integrated dose area pro ...
... Routine Coronary Angiography is a relatively high dose diagnostic procedure. The results from a diagnostic procedure may indicate the need for an interventional examination, which has the potential for even higher patient dose. Doses for these procedures are monitored via an integrated dose area pro ...
Cone Beam Computed Tomography (CBCT) Dosimetry
... MC model of the OBI x-ray tube was built into the system and validated by measurements characterizing the cone beam quality in the aspects of the x-ray spectrum, half value layer (HVL) and dose profiles for both full-fan and half-fan modes. Using the validated MC model, CTDICB, dose profile integral ...
... MC model of the OBI x-ray tube was built into the system and validated by measurements characterizing the cone beam quality in the aspects of the x-ray spectrum, half value layer (HVL) and dose profiles for both full-fan and half-fan modes. Using the validated MC model, CTDICB, dose profile integral ...