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https://www.readbyqxmd.com/read/28170300/effect-of-radiation-dose-reduction-and-reconstruction-algorithm-on-image-noise-contrast-resolution-and-detectability-of-subtle-hypoattenuating-liver-lesions-at-multidetector-ct-filtered-back-projection-versus-a-commercial-model-based-iterative-reconstruction
#1
Justin Solomon, Daniele Marin, Kingshuk Roy Choudhury, Bhavik Patel, Ehsan Samei
Purpose To determine the effect of radiation dose and iterative reconstruction (IR) on noise, contrast, resolution, and observer-based detectability of subtle hypoattenuating liver lesions and to estimate the dose reduction potential of the IR algorithm in question. Materials and Methods This prospective, single-center, HIPAA-compliant study was approved by the institutional review board. A dual-source computed tomography (CT) system was used to reconstruct CT projection data from 21 patients into six radiation dose levels (12...
February 7, 2017: Radiology
https://www.readbyqxmd.com/read/28144112/clinical-implementation-of-an-electron-monitor-unit-dosimetry-system-based-on-task-group-71-report-and-a-commercial-calculation-program
#2
Huijun Xu, Mariana Guerrero, Shifeng Chen, Xiaocheng Yang, Karl Prado, Colleen Schinkel
Many clinics still use monitor unit (MU) calculations for electron treatment planning and/or quality assurance (QA). This work (1) investigates the clinical implementation of a dosimetry system including a modified American Association of Physicists in Medicine-task group-71 (TG-71)-based electron MU calculation protocol (modified TG-71 electron [mTG-71E] and an independent commercial calculation program and (2) provides the practice recommendations for clinical usage. Following the recently published TG-71 guidance, an organized mTG-71E databook was developed to facilitate data access and subsequent MU computation according to our clinical need...
October 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/28132850/increasing-faculty-participation-in-resident-education-and-providing-cost-effective-self-assessment-module-credit-to-faculty-through-resident-generated-didactics
#3
Hyun Kim, Theresa M Malatesta, Pramila R Anné, John McAna, Voichita Bar-Ad, Adam P Dicker, Robert B Den
PURPOSE/OBJECTIVE(S): Board certified radiation oncologists and medical physicists are required to earn self-assessment module (SAM) continuing medical education (CME) credit, which may require travel costs or usage fees. Data indicate that faculty participation in resident teaching activities is beneficial to resident education. Our hypothesis was that providing the opportunity to earn SAM credit in resident didactics would increase faculty participation in and improve resident education...
December 16, 2016: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28060423/famous-medical-physicists-often-get-more-credit-for-discoveries-due-to-their-fame-than-less-prominent-scientists-who-may-have-contributed-as-much-or-earlier-to-these-developments
#4
Clive Baldock, L John Schreiner, Colin G Orton
Medical physics is a rapidly developing, technologically dependent, field. New discoveries are being made almost daily, as demonstrated by papers in this and other similar journals. Many of the authors are early in their careers. Some are concerned, however, that more famous medical physicists often get credit for discoveries due to their fame rather than less prominent scientists who may have, in fact, contributed more to the development in question. This is the claim debated in this month's Point/Counterpoint...
January 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28048913/mo-de-bra-02-simac-a-simulation-tool-for-teaching-linear-accelerator-physics
#5
M Carlone, N Harnett, W Harris, B Norrlinger, M MacPherson, M Lamey, R Anderson, M Oldham
PURPOSE: The first goal of this work is to develop software that can simulate the physics of linear accelerators (linac). The second goal is to show that this simulation tool is effective in teaching linac physics to medical physicists and linac service engineers. METHODS: Linacs were modeled using analytical expressions that can correctly describe the physical response of a linac to parameter changes in real time. These expressions were programmed with a graphical user interface in order to produce an environment similar to that of linac service mode...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048892/su-f-j-116-clinical-experience-based-verification-and-improvement-of-a-4dct-program
#6
P Fogg, M West, T Aland
PURPOSE: To demonstrate the role of continuous improvement fulfilled by the Medical Physicist in clinical 4DCT and CBCT scanning. METHODS: Lung (SABR and Standard) patients' 4D respiratory motion and image data were reviewed over a 3, 6 and 12 month period following commissioning testing. By identifying trends of clinically relevant parameters and respiratory motions, variables were tested with a programmable motion phantom and assessed. Patient traces were imported to a motion phantom and 4DCT and CBCT imaging were performed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048891/th-e-209-00-radiation-dose-monitoring-and-protocol-management
#7
Matthew Palmer
: Radiation dose monitoring solutions have opened up new opportunities for medical physicists to be more involved in modern clinical radiology practices. In particular, with the help of comprehensive radiation dose data, data-driven protocol management and informed case follow up are now feasible. Significant challenges remain however and the problems faced by medical physicists are highly heterogeneous. Imaging systems from multiple vendors and a wide range of vintages co-exist in the same department and employ data communication protocols that are not fully standardized or implemented making harmonization complex...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048885/mo-d-brb-03-quality-assurance-of-sbrt
#8
J Roper
: Increased use of SBRT and hypofractionation in radiation oncology practice has posted a number of challenges to medical physicist, ranging from planning, image-guided patient setup and on-treatment monitoring, to quality assurance (QA) and dose delivery. This symposium is designed to provide current knowledge necessary for the safe and efficient implementation of SBRT in various linac platforms, including the emerging digital linacs equipped with high dose rate FFF beams. Issues related to 4D CT, PET and MRI simulations, 3D/4D CBCT guided patient setup, real-time image guidance during SBRT dose delivery using gated/un-gated VMAT/IMRT, and technical advancements in QA of SBRT (in particular, strategies dealing with high dose rate FFF beams) will be addressed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048871/mo-f-204-00-preparing-for-the-abr-diagnostic-and-nuclear-medical-physics-exams
#9
Nicholas Bevins
: Adequate, efficient preparation for the ABR Diagnostic and Nuclear Medical Physics exams is key to successfully obtain ABR certification. Each part of the ABR exam presents its own challenges: Part I: Determine the scope of basic medical physics study material, efficiently review this material, and solve related written questions/problems. Part II: Understand imaging principles, modalities, and systems, including image acquisition, processing, and display. Understand the relationship between imaging techniques, image quality, patient dose and safety, and solve related written questions/problems...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048826/su-f-p-03-management-of-time-to-treatment-inititation-case-for-an-electronic-whiteboard
#10
N Adnani
PURPOSE: To determine if data mining of an electronic whiteboard improves the management of the Time to Treatment Initiation (TTI) in radiation oncology. METHODS: An electronic whiteboard designed to help in managing the planning workflow and improves communication regarding patient planning progress was used to record the dates at which each phase of the planning process began or completed. These are CT Sim date, Plan Start, Physician Review, Physicist Review, Approval for Treatment Delivery, Setup or Verification of Simulation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048799/mo-f-201-02-panel-member
#11
L Padilla
: The goal of this session is to provide guidance to medical physicists undergoing the American Board of Radiology certification process in therapeutic medical physics. This panel discussion will focus on parts 2 (computer-based) and 3 (oral) of the examination. Unlike the latter portions of the exam which are specialty-driven, part 1 is universal for all medical physics fields and will not be addressed. This session is structured into different topics that aim to guide the participants on how to successfully prepare for the board exams...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048796/mo-fg-campus-jep2-04-comparison-study-for-ct-and-mr-only-prostate-imrt-treatment-planning-a-framework-for-the-estimation-of-relative-contribution-of-body-contour-discrepancies-tissue-stratification-and-hu-red-conversion-to-the-overall-dose-difference
#12
M Maspero, P R Seevinck, G Schubert, M Hoesl, G J Meijer, M A Viergever, Jjw Lagendijk, Cat van den Berg
PURPOSE: To compare dose of prostate IMRT plans on CT vs MR-based pseudo-CT (pCT). A framework is demonstrated to isolate various confounding factors causing dose differences. This approach will be valuable for medical physicists interested in commissioning strategy of MR-only dose planning. METHODS: A retrospective study was conducted on fourteen prostate patients that underwent CT and MRI scans. MR was equipped with an in-house-developed flat table-top and coil support...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048752/tu-a-brb-02-panel-member
#13
L Ma
: Brain stereotactic radiosurgery (SRS) and spine stereotactic body radiation therapy (SBRT) are commonly treated by a multidisciplinary team of neurosurgeons, radiation oncologists, and medical physicists. However the treatment objectives, constraints, and technical considerations involved can be quite different between the two techniques. In this interactive session an expert panel of speakers will present clinical brain SRS and spine SBRT cases in order to demonstrate real-world considerations for ensuring safe and accurate treatment delivery and to highlight the significant differences in approach for each treatment site...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048745/tu-d-brc-01-novel-applications-for-current-epid-technology
#14
J Rottmann
There has been increased deployment of gantry-mounted linacs with onboard kilovoltage x-ray imagers. Despite this trend, most clinics still employ beam's-eye-view (BEV) imaging using flat panel electronic portal imaging devices (EPIDs) as a highly useful means of verifying geometric localization pre- and post-delivery. In recent years, there has been increased interest in the use of EPIDs for a variety of clinical and investigational applications ranging from megavoltage cone-beam CT, in vivo dosimetry, patient-specific QA to real-time target localization for dynamic MLC-based tumor tracking...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048741/mo-g-204-00-the-american-board-of-radiology-maintenance-of-certification-process
#15
G Donald Frey
1. The participants will understand how to comply with the revised ABR MOC requirements 2. The participants be able to utilize the new Participatory PQI into their MOC program 3. The participants will be able to comply with the ABR MOC simplified attestation requirements 4. The participants will be able to meet the requirements for the annual ABR MOC lookback This presentation will update medical physicists about the American Board of Radiology Maintenance of Certification (MOC) process. The MOC process has recently undergone a number of significant changes and this presentation will review these for the attendees...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048739/tu-ab-207a-03-image-quality-dose-and-clinical-applications
#16
F Dong
: Practicing medical physicists are often time charged with the tasks of evaluating and troubleshooting complex image quality issues related to CT scanners. This course will equip them with a solid and practical understanding of common CT imaging chain and its major components with emphasis on acquisition physics and hardware, reconstruction, artifacts, image quality, dose, and advanced clinical applications. The core objective is to explain the effects of these major system components on the image quality...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048733/mo-de-201-02-self-awareness
#17
J Johnson
: Medical physicists possess technical knowledge and problem solving skills required to deliver high quality diagnosis and treatment in the clinic, to provide excellence in research, or to transfer expertise in industrial or regulatory environments. As the healthcare industry rapidly evolves, medical physicists must make a case for ensuring recognition of their value. One of many ways the AAPM is working to ensure stewardship of the profession is through development of the Medical Physics Leadership Academy (MPLA)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048726/tu-d-201-01-2016-economics-update
#18
J Fontenot, W Fuss
The purpose of this session is to introduce attendees to the healthcare reimbursement system and how it applies to the clinical work of a medical physicist. This will include general information about the different categories of payers and payees, how work is described by CPT codes, and how various payers set values for this work in different clinical settings. 2016 is another year of significant changes to the payment system. This presentation will describe the work encompassed in these codes and will give attendees an overview of the changes for 2016 as they apply to radiation oncology...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048700/tu-d-bra-00-treatment-planning-system-commissioning-and-qa
#19
Greg Salomons
INTRODUCTION: Treatment planning systems (TPS) are a cornerstone of modern radiation therapy. Errors in their commissioning or use can have a devastating impact on many patients. To support safe and high quality care, medical physicists must conduct efficient and proper commissioning, good clinical integration, and ongoing quality assurance (QA) of the TPS. AAPM Task Group 53 and related publications have served as seminal benchmarks for TPS commissioning and QA over the past two decades...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048693/tu-fg-204-01-an-overview-of-acr-joint-commission-and-the-aapm-practice-guidelines-on-ct-protocol-optimization
#20
T Szczykutowicz
: The role of a medical physicist involved with clinical CT activities is changing rapidly. No longer is the physicist responsible for simply ensuring scanner QA. This shift is evident by looking at the trend to regulate more and more aspects of what activities must be performed to keep a CT practice within compliance. In this symposium, new guidelines from the ACR, Joint Commission, and several states will be addressed. An overview of these regulations will be provided. Then, three speakers will provide an in-depth account of how their CT protocol Optimization team functions...
June 2016: Medical Physics
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