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https://www.readbyqxmd.com/read/29235120/two-dimensional-antiscatter-grid-a-novel-scatter-rejection-device-for-cone-beam-computed-tomography
#1
Timur Alexeev, Brian Kavanagh, Moyed Miften, Cem Altunbas
PURPOSE: Scattered radiation remains to be a major cause of image quality degradation in Flat Panel Detector (FPD) based Cone-beam computed tomography (CBCT). We have been investigating a novel two dimensional antiscatter grid (2D-ASG) concept to reduce scatter intensity, and hence improve CBCT image quality. We present the first CBCT imaging experiments performed with the 2D-ASG prototype, and demonstrate its efficacy in improving CBCT image quality. METHODS: A 2D-ASG prototype with septa focused to x-ray source was additively manufactured from tungsten and mounted on a Varian TrueBeam CBCT system...
December 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/28766904/technical-note-trog-15-01-spark-trial-multi-institutional-imaging-dose-measurement
#2
Kimberley Legge, Peter B Greer, Paul J Keall, Jeremy T Booth, Sankar Arumugam, Trevor Moodie, Doan T Nguyen, Jarad Martin, Daryl John O'Connor, Joerg Lehmann
PURPOSE: The Trans-Tasman Radiation Oncology Group (TROG) 15.01 Stereotactic Prostate Adaptive Radiotherapy utilizing Kilovoltage intrafraction monitoring (SPARK) trial is a multicenter trial using Kilovoltage Intrafraction Monitoring (KIM) to monitor prostate position during the delivery of prostate radiation therapy. KIM increases the accuracy of prostate radiation therapy treatments and allows for hypofractionation. However, an additional imaging dose is delivered to the patient. A standardized procedure to determine the imaging dose per frame delivered using KIM was developed and applied at four radiation therapy centers on three different types of linear accelerator...
August 2, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28432806/rapid-acceptance-testing-of-modern-linac-using-on-board-mv-and-kv-imaging-systems
#3
Sridhar Yaddanapudi, Bin Cai, Taylor Harry, Steven Dolly, Baozhou Sun, Hua Li, Keith Stinson, Camille Noel, Lakshmi Santanam, Todd Pawlicki, Sasa Mutic, S Murty Goddu
PURPOSE: The purpose of this study was to develop a novel process for using on-board MV and kV Electronic Portal Imaging Devices (EPIDs) to perform linac acceptance testing (AT) for two reasons: (a) to standardize the assessment of new equipment performance, and (b) to reduce the time to clinical use while reducing physicist workload. METHODS AND MATERIALS: In this study, Varian TrueBeam linacs equipped with amorphous silicon-based EPID (aS1000) were used. The conventional set of AT tests and tolerances were used as a baseline guide...
July 2017: Medical Physics
https://www.readbyqxmd.com/read/28429391/technical-note-direct-measurement-of-continuous-tmr-data-with-a-1d-tank-and-automated-couch-movements
#4
Nels C Knutson, Matthew C Schmidt, Matthew D Belley, Ngoc B Nguyen, H Harold Li, Erno Sajo, Michael J Price
PURPOSE: Real-time dynamic control of the linear accelerator, couch, and imaging parameters during radiation delivery was investigated as a novel technique for acquiring tissue maximum ratio (TMR) data. METHODS: TrueBeam Developer Mode (Varian Medical Systems, Palo Alto, CA, USA) was used to control the linear accelerator using the Extensible Markup Language (XML). A single XML file was used to dynamically manipulate the machine, couch, and imaging parameters during radiation delivery...
April 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28422401/mlc-based-penumbra-softener-of-edw-borders-to-reduce-junction-inhomogeneities
#5
Stanislaw Szpala, Kirpal Kohli
Junctions of fields are known to be susceptible to developing cold or hot spots in the presence of even small geometrical misalignments. Reduction of these dose inhomogeneities can be accomplished through decreasing the dose gradients in the penumbra, but currently it cannot be done for enhanced dynamic wedges (EDW). An MLC-based penumbra softener was developed in the developer mode of TrueBeam linacs to reduce dose gradients across the side border of EDWs. The movement of each leaf was individually synchronized with the movement of the dynamic Y jaw to soften the penumbra in the same manner along the entire field border, in spite of the presence of the dose gradient of the EDW...
April 19, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297306/epid-based-dosimetry-to-verify-imrt-planar-dose-distribution-for-the-as1200-epid-and-fff-beams
#6
Narges Miri, Peter Keller, Benjamin J Zwan, Peter Greer
We proposed to perform a basic dosimetry commissioning on a new imager system, the Varian aS1200 electronic portal imaging device (EPID) and TrueBeam 2.0 linear accelerator for flattened (FF) and flattening filter-free (FFF) beams, then to develop an image-based quality assurance (QA) model for verification of the system delivery accuracy for intensity-modulated radiation therapy (IMRT) treatments. For dosimetry testing, linearity of dose response with MU, imager lag, and effectiveness of backscatter shielding were investigated...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28048909/su-f-p-36-automation-of-linear-accelerator-star-shot-measurement-with-advanced-xml-scripting-and-electronic-portal-imaging-device
#7
N Nguyen, N Knutson, M Schmidt, M Price
PURPOSE: To verify a method used to automatically acquire jaw, MLC, collimator and couch star shots for a Varian TrueBeam linear accelerator utilizing Developer Mode and an Electronic Portal Imaging Device (EPID). METHODS: An XML script was written to automate motion of the jaws, MLC, collimator and couch in TrueBeam Developer Mode (TBDM) to acquire star shot measurements. The XML script also dictates MV imaging parameters to facilitate automatic acquisition and recording of integrated EPID images...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048763/su-g-brc-10-feasibility-of-a-web-based-monte-carlo-simulation-tool-for-dynamic-electron-arc-radiotherapy-dear
#8
A Rodrigues, D Sawkey, Q Wu
PURPOSE: DEAR is a radiation therapy technique utilizing synchronized motion of gantry and couch during delivery to optimize dose distribution homogeneity and penumbra for treatment of superficial disease. Dose calculation for DEAR is not yet supported by commercial TPSs. The purpose of this study is to demonstrate the feasibility of using a web-based Monte Carlo (MC) simulation tool (VirtuaLinac) to calculate dose distributions for a DEAR delivery. METHODS: MC simulations were run through VirtuaLinac, which is based on the GEANT4 platform...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048603/tu-h-bra-03-performance-of-a-clinical-gridded-electron-gun-in-magnetic-fields-implications-for-mri-linac-therapy
#9
B Whelan, M Bazalova-Carter, B Oborn, D Constantin, L Holloway, R Fahrig, P Keall
PURPOSE: Recent advances towards MRI Linac radiotherapy have motivated a wide range of studies characterizing electromagnetic interactions between the two devices. One of the most sensitive components is the linac electron gun. To data, only non gridded (diode) guns have been investigated however, most linac vendors utilize gridded (triode) guns, which enable efficient and robust beam gating. The purpose of this study was to develop a realistic model of a gridded gun used clinically, and to characterize its performance in magnetic fields...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048602/su-f-t-262-commissioning-varian-portal-dosimetry-for-epid-based-patient-specific-qa-in-a-non-aria-environment
#10
M Schmidt, N Knutson, J Herrington, M Price
PURPOSE: Development of an in-house program facilitates a workflow that allows Electronic Portal Imaging Device (EPID) patient specific quality assurance (QA) measurements to be acquired and analyzed in the Portal Dosimetry Application (Varian Medical Systems, Palo Alto, CA) using a non-Aria Record and Verify (R&V) system (MOSAIQ, Elekta, Crawley, UK) to deliver beams in standard clinical treatment mode. METHODS: Initial calibration of an in-house software tool includes characterization of EPID dosimetry parameters by importing DICOM images of varying delivered MUs to determine linear mapping factors in order to convert image pixel values to Varian-defined Calibrated Units (CU)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048583/su-f-t-503-trajectory-modulated-arc-therapy-of-intracranial-lesions-development-of-a-standardized-path-based-technique-for-fully-dynamic-couch-gantry-modulated-treatments
#11
S Khan, E Chin, K Otto, L Xing, D Hristov, B Fahimian
PURPOSE: The integration of couch motion during arc delivery is necessitated to enable irradiation trajectories such as coronal arcs, and to enhance the geometrical sampling for dynamic deliveries to the highest extent. To enable such capability, a platform of Trajectory Modulated Arc Therapy (TMAT) is developed in conjunction with standardized noncollisional dynamic path-set for irradiation of intracranial lesions. METHODS: A generalized path-set was constructed through the combination of sagittal arcs (45 degrees from the CAX), axial arcs, and coronal arcs produced through modulation of the dynamic rotation of couch...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048269/su-f-r-12-prediction-of-truebeam-hardware-issues-using-trajectory-log-analysis
#12
D DiCostanzo, A Ayan, J Woollard, N Gupta
PURPOSE: To predict potential failures of hardware within the Varian TrueBeam linear accelerator in order to proactively replace parts and decrease machine downtime. METHODS: Machine downtime is a problem for all radiation oncology departments and vendors. Most often it is the result of unexpected equipment failure, and increased due to lack of in-house clinical engineering support. Preventative maintenance attempts to assuage downtime, but often is ineffective at preemptively preventing many failure modes such as MLC motor failures, the need to tighten a gantry chain, or the replacement of a jaw motor, among other things...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048072/su-f-t-259-gpr-tables-for-the-estimation-of-mid-plane-dose-using-epid
#13
Gopiraj Annamalai, Yoichi Watanabe
PURPOSE: To develop a simple method for estimating the mid-plane dose (MPD) of a patient using Electronic Portal imaging Device (EPID). METHODS: A Varian TrueBeam with aSi100 EPID was used in this study. The EPID images were acquired for a 30 cm × 30 cm homogeneous slab phantom and a 30 cm diameter 20 cm thick cylindrical phantom in the continuous dosimetry mode. The acquired EPID images in XIM format were imported into in-house MATLAB program for the data analysis...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046968/th-ef-brb-10-dosimetric-validation-of-a-trajectory-based-cranial-srs-treatment-technique-on-a-varian-truebeam-linac
#14
B Wilson, E Gete
PURPOSE: This work investigates the dosimetric accuracy of a trajectory based delivery technique in which an optimized radiation beam is delivered along a Couch-Gantry trajectory that is formed by simultaneous rotation of the linac gantry and the treatment couch. METHODS: Nine trajectory based cranial SRS treatment plans were created using in-house optimization software. The plans were calculated for delivery on the TrueBeam STx linac with 6MV photon beam. Dose optimization was performed along a user-defined trajectory using MLC modulation, dose rate modulation and jaw tracking...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046712/mo-fg-202-03-efficient-data-collection-of-continuous-2d-and-discrete-relative-dosimetric-data-for-annual-linac-qa-using-truebeam-developer-mode-and-a-1d-scanning-tank
#15
N Knutson, M Schmidt, N Nguyen, M Belley, M Price
PURPOSE: To develop a method to exploit real-time dynamic machine and couch parameter control during linear accelerator (LINAC) beam delivery to facilitate efficient performance of TG-142 suggested, Annual LINAC QA tests. METHODS: Varian's TrueBeam Developer Mode (Varian Medical Systems, Palo Alto, CA) facilitates control of Varian's TrueBeam LINAC via instructions provided in Extensible Markup Language (XML) files. This allows machine and couch parameters to be varied dynamically, in real-time, during beam delivery...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27929502/epid-based-dosimetry-to-verify-imrt-planar-dose-distribution-for-the-as1200-epid-and-fff-beams
#16
Narges Miri, Peter Keller, Benjamin J Zwan, Peter Greer
We proposed to perform a basic dosimetry commissioning on a new imager sys-tem, the Varian aS1200 electronic portal imaging device (EPID) and TrueBeam 2.0 linear accelerator for flattened (FF) and flattening filter-free (FFF) beams, then to develop an image-based quality assurance (QA) model for verification of the system delivery accuracy for intensity-modulated radiation therapy (IMRT) treat-ments. For dosimetry testing, linearity of dose response with MU, imager lag, and effectiveness of backscatter shielding were investigated...
November 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/26520735/the-development-and-verification-of-a-highly-accurate-collision-prediction-model-for-automated-noncoplanar-plan-delivery
#17
Victoria Y Yu, Angelia Tran, Dan Nguyen, Minsong Cao, Dan Ruan, Daniel A Low, Ke Sheng
PURPOSE: Significant dosimetric benefits had been previously demonstrated in highly noncoplanar treatment plans. In this study, the authors developed and verified an individualized collision model for the purpose of delivering highly noncoplanar radiotherapy and tested the feasibility of total delivery automation with Varian TrueBeam developer mode. METHODS: A hand-held 3D scanner was used to capture the surfaces of an anthropomorphic phantom and a human subject, which were positioned with a computer-aided design model of a TrueBeam machine to create a detailed virtual geometrical collision model...
November 2015: Medical Physics
https://www.readbyqxmd.com/read/26219002/use-of-truebeam-developer-mode-for-imaging-qa
#18
Gilmer Valdes, Olivier Morin, Yanisley Valenciaga, Niel Kirby, Jean Pouliot, Cynthia Chuang
The purpose of this study was to automate regular Imaging QA procedures to become more efficient and accurate. Daily and monthly imaging QA for SRS and SBRT protocols were fully automated on a Varian linac. A three-step paradigm where the data are automatically acquired, processed, and analyzed was defined. XML scripts were written and used in developer mode in a TrueBeam linac to automatically acquire data. MATLAB R013B was used to develop an interface that could allow the data to be processed and analyzed...
July 8, 2015: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/26129174/we-ab-303-10-the-use-of-on-board-kv-imaging-during-respiratory-gated-vmat-delivery-to-determine-the-correlation-and-phase-shift-between-external-marker-motion-and-internal-tumour-motion
#19
I Xhaferllari, O El-Sherif, S Gaede
PURPOSE: To determine the correlation between internal tumor motion and external surrogate motion and any potential phase shifts during respiratory-gated VMAT delivery using on-board kV imaging. METHODS: A respiratory motion phantom was used to trace the motion of an internal target, embedded with a 3 cm moving target, and an external surrogate. On-board kV projections were acquired at 11 frames per second during VMAT delivery on a TrueBeam v.1.6 (Varian Medical Systems, Palo Alto, CA) operating in developer mode...
June 2015: Medical Physics
https://www.readbyqxmd.com/read/26129166/we-ab-303-01-featured-presentation-a-dual-detector-phase-matched-digital-tomosynthesis-dts-imaging-scheme-using-aggregated-kv-and-mv-projections-for-intra-treatment-lung-tumor-tracking
#20
Y Zhang, F Yin, R Mao, R Gao, L Ren
PURPOSE: To develop a dual-detector phase-matched DTS technique for continuous and fast intra-treatment lung tumor localization. METHODS: Tumor localization accuracy of limited-angle DTS imaging is affected by low inter-slice resolution. The dual-detector DTS technique aims to overcome this limitation through combining orthogonally acquired beam's eye view MV projections and kV projections for intra-treatment DTS reconstruction and localization. To aggregate the kV and MV projections for reconstruction, the MV projections were linearly converted to synthesize corresponding kV projections...
June 2015: Medical Physics
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