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https://www.readbyqxmd.com/read/28048823/mo-fg-brb-04-debater
#1
J Seibert
: Building on the energy and excitement of Washington DC in a presidential election year, AAPM will host its own Presidential Debate to better understand the views of the AAPM membership! Past presidents of the AAPM, Drs. Bayouth, Hazle, Herman, and Seibert, will debate hot topics in medical physics including issues facing education, professional practice, and the advancement of science. The moderators, Drs. Brock and Stern, will also draw in topics from Point-Counterpoint articles from the Medical Physics Journals...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048743/mo-fg-brb-00-aapm-presidential-debate
#2
Kristy Brock, Robin Stern
: Building on the energy and excitement of Washington DC in a presidential election year, AAPM will host its own Presidential Debate to better understand the views of the AAPM membership! Past presidents of the AAPM, Drs. Bayouth, Hazle, Herman, and Seibert, will debate hot topics in medical physics including issues facing education, professional practice, and the advancement of science. The moderators, Drs. Brock and Stern, will also draw in topics from Point-Counterpoint articles from the Medical Physics Journals...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048700/tu-d-bra-00-treatment-planning-system-commissioning-and-qa
#3
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/28048659/tu-fg-201-03-automatic-pre-delivery-verification-using-statistical-analysis-of-consistencies-in-treatment-plan-parameters-by-the-treatment-site-and-modality
#4
S Liu, Y Wu, X Chang, H Li, D Yang
PURPOSE: A novel computer software system, namely APDV (Automatic Pre-Delivery Verification), has been developed for verifying patient treatment plan parameters right prior to treatment deliveries in order to automatically detect and prevent catastrophic errors. METHODS: APDV is designed to continuously monitor new DICOM plan files on the TMS computer at the treatment console. When new plans to be delivered are detected, APDV checks the consistencies of plan parameters and high-level plan statistics using underlying rules and statistical properties based on given treatment site, technique and modality...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048531/we-f-204-02-a-research-career-in-medical-physics-from-student-to-faculty
#5
M Giger
: In recent years heavy focus has been placed on clinical careers in medical physics, and the pathways to such careers are well-known and well-described. For the future advancement of the field of medical physics, it is necessary the focus also include research-oriented careers. It is important for the younger generation of medical physicists to know that there are many career opportunities in research, and that it is quite possible to build a successful career in which research is a major component...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048438/th-ab-bra-01-a-novel-doubly-focused-multileaf-collimator-design-for-mr-guided-radiation-therapy
#6
H Li, S Mutic, D Low, O Green, G Fought, I Kawrakow, A Sharma, S Shvartsman, J Dempsey
PURPOSE: To describe the physical and dosimetric properties of a novel double-stack multileaf collimator (MLC). METHODS: One of the compromises made in the MLC design has been to employ linear-motion singly-divergent shapes. Because the MLC leading edge moves linearly, it is rounded to provide a consistent, albeit compromised penumbra. The MLC employed in the new linac-based MR-IGRT unit is designed to be doubly focused in that each leaf moves in an arc centered at the source, and the sides of the leaves are machined such that they lie parallel to a line between the leaf edge and the source...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048331/su-f-j-110-mri-guided-single-session-simulation-online-adaptation-and-treatment
#7
P Hill, M Geurts, K Mittauer, J Bayouth
PURPOSE: To develop a combined simulation and treatment workflow for MRI-guided radiation therapy using the ViewRay treatment planning and delivery system. METHODS: Several features of the ViewRay MRIdian planning and treatment workflows are used to simulate and treat patients that require emergent radiotherapy. A simple "pre-plan" is created on diagnostic imaging retrieved from radiology PACS, where conformal fields are created to target a volume defined by a physician based on review of the diagnostic images and chart notes...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048318/we-h-brc-06-a-unified-machine-learning-based-probabilistic-model-for-automated-anomaly-detection-in-the-treatment-plan-data
#8
X Chang, A Kalet, S Liu, D Yang
PURPOSE: The purpose of this work was to investigate the ability of a machine-learning based probabilistic approach to detect radiotherapy treatment plan anomalies given initial disease classes information. METHODS: In total we obtained 1112 unique treatment plans with five plan parameters and disease information from a Mosaiq treatment management system database for use in the study. The plan parameters include prescription dose, fractions, fields, modality and techniques...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048085/mo-fg-brb-01-debater
#9
J Bayouth
: Building on the energy and excitement of Washington DC in a presidential election year, AAPM will host its own Presidential Debate to better understand the views of the AAPM membership! Past presidents of the AAPM, Drs. Bayouth, Hazle, Herman, and Seibert, will debate hot topics in medical physics including issues facing education, professional practice, and the advancement of science. The moderators, Drs. Brock and Stern, will also draw in topics from Point-Counterpoint articles from the Medical Physics Journals...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048059/tu-ab-202-06-quantitative-evaluation-of-deformable-image-registration-in-mri-guided-adaptive-radiation-therapy
#10
K Mooney, T Zhao, Y Duan, M Zhang, O Green, S Mutic, D Yang
PURPOSE: To assess the performance of the deformable image registration algorithm used for MRI-guided adaptive radiation therapy using image feature analysis. METHODS: MR images were collected from five patients treated on the MRIdian (ViewRay, Inc., Oakwood Village, OH), a three head Cobalt-60 therapy machine with an 0.35 T MR system. The images were acquired immediately prior to treatment with a uniform 1.5 mm resolution. Treatment sites were as follows: head/neck, lung, breast, stomach, and bladder...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048042/tu-ab-bra-07-distortion-free-3d-diffusion-mri-on-an-mri-guided-radiotherapy-system-for-longitudinal-tumor-response-assessment
#11
Y Gao, Y Yang, N Rangwala, M Cao, D Low, P Hu
PURPOSE: To develop a reliable, 3D distortion-free diffusion MRI technique for longitudinal tumor response assessment and MRI-guided adaptive radiotherapy(RT). METHODS: A diffusion prepared 3D turbo spin echo readout (DP-TSE) sequence was developed and compared with the conventional diffusion-weighted single-shot echo-planar-imaging (DW-ssEPI) sequence in a commercially available diffusion phantom, and one head-and-neck and one brain cancer patient on an MRI-guided RT system (ViewRay)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048038/tu-d-bra-01-tps-commissioning-and-qa-planning-and-monitoring
#12
G 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/28047892/su-c-207b-02-maximal-noise-reduction-filter-with-anatomical-structures-preservation
#13
R Maitree, G Guzman, A Chundury, M Roach, D Yang
PURPOSE: All medical images contain noise, which can result in an undesirable appearance and can reduce the visibility of anatomical details. There are varieties of techniques utilized to reduce noise such as increasing the image acquisition time and using post-processing noise reduction algorithms. However, these techniques are increasing the imaging time and cost or reducing tissue contrast and effective spatial resolution which are useful diagnosis information. The three main focuses in this study are: 1) to develop a novel approach that can adaptively and maximally reduce noise while preserving valuable details of anatomical structures, 2) to evaluate the effectiveness of available noise reduction algorithms in comparison to the proposed algorithm, and 3) to demonstrate that the proposed noise reduction approach can be used clinically...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047872/we-f-204-03-developing-a-corporate-research-and-innovation-laboratory
#14
J Dempsey
: In recent years heavy focus has been placed on clinical careers in medical physics, and the pathways to such careers are well-known and well-described. For the future advancement of the field of medical physics, it is necessary the focus also include research-oriented careers. It is important for the younger generation of medical physicists to know that there are many career opportunities in research, and that it is quite possible to build a successful career in which research is a major component...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047833/th-cd-bra-06-magnetic-field-effects-on-gafchromic-film-response-in-mr-igrt
#15
F Reynoso, A Curcuru, O Green, S Mutic, I Das, L Santanam
PURPOSE: To investigate the effects of magnetic fields in radiochromic films (RCF). Magnetokinetic changes may affect crystal orientation and polymerization within active layer of RCF, these effects are investigated in Magnetic Resonance Image-guided Radiotherapy (MR-IGRT). METHODS: Gafchromic EBT2 RCF were irradiated in a 30×30×30 cm(3) solid water phantom using a ViewRay MRIdian Co-60 MRI guided radiotherapy system (B=0.35 T). Fifteen 20.3×25.4 cm(2) EBT2 film sheets were placed at three different depths (d=0...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047606/su-g-bra-04-simulation-of-errors-in-maximal-intensity-projection-mip-based-lung-tumor-internal-target-volumes-itv-using-real-time-2d-mri-and-deformable-image-registration-based-lung-tumor-tracking
#16
D Thomas, A Kishan, A Santhanam, Y Min, D O'Connell, J Lamb, M Cao, N Agazaryan, Y Yang, P Lee, D Low
PURPOSE: To evaluate the effect of inter- and intra-fractional tumor motion on the error in four-dimensional computed tomography (4DCT) maximal intensity projection (MIP)-based lung tumor internal target volumes (ITV), using deformable image registration of real-time 2D-sagital cine-mode MRI acquired during lung SBRT treatments. METHODS: Five lung tumor patients underwent free breathing SBRT treatment on the ViewRay, with dose prescribed to PTV (4DCT MIP-based ITV+3-6mm margin)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047426/mo-fg-brb-02-debater
#17
J Hazle
: Building on the energy and excitement of Washington DC in a presidential election year, AAPM will host its own Presidential Debate to better understand the views of the AAPM membership! Past presidents of the AAPM, Drs. Bayouth, Hazle, Herman, and Seibert, will debate hot topics in medical physics including issues facing education, professional practice, and the advancement of science. The moderators, Drs. Brock and Stern, will also draw in topics from Point-Counterpoint articles from the Medical Physics Journals...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047415/su-f-j-17-patient-localization-using-mri-guided-soft-tissue-for-head-and-neck-radiotherapy-indication-for-margin-reduction-and-its-feasibility
#18
X Qi, Y Yang, N Jack, A Santhanam, L Yang, A Chen, D Low
PURPOSE: On-board MRI provides superior soft-tissue contrast, allowing patient alignment using tumor or nearby critical structures. This study aims to study H&N MRI-guided IGRT to analyze inter-fraction patient setup variations using soft-tissue targets and design appropriate CTV-to-PTV margin and clinical implication. METHODS: 282 MR images for 10 H&N IMRT patients treated on a ViewRay system were retrospectively analyzed. Patients were immobilized using a thermoplastic mask on a customized headrest fitted in a radiofrequency coil and positioned to soft-tissue targets...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047402/su-f-i-52-an-approach-to-estimate-noise-in-patient-image-by-computing-the-minimal-difference-in-neighborhoods
#19
R Maitree, A Curcuru, H Gach, D Yang
PURPOSE: To quantitatively evaluate and compare the accuracy of two advanced methods that can estimate the level of noise per voxel in patient images. These noise estimation methods show promises in: 1) assuring the performance of imaging systems and algorithms, 2) guiding image processing tasks for clinical and research applications, i.e. by optimization of the parameters, and 3) quantifying patient image quality and assisting image quality improvements. METHODS: We conducted an experiment of 34 repeated MRI scans (TrueFISP sequence) of a swine head in order to obtain a ground truth noise dataset...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047385/mo-e-brc-02-mri-guided-online-adaptive-radiotherapy-the-ucla-approach-to-quality-management
#20
J Lamb
: Online adaptive radiation therapy has the potential to ensure delivery of optimal treatment to the patient by accounting for anatomical and potentially functional changes that occur from one fraction to the next and over the course of treatment. While on-line adaptive RT (ART) has been a topic of many publications, discussions, and research, it has until very recently remained largely a concept and not a practical implementation. However, recent advances in on-table imaging, use of deformable image registration for contour generation and dose tracking, faster and more efficient plan optimization, as well as fast quality assurance method has enabled the implementation of ART in the clinic in the past couple of years...
June 2016: Medical Physics
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