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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/28649722/comparison-of-dvh-based-plan-verification-methods-for-vmat-arccheck-3dvh-system-and-dynalog-based-dose-reconstruction
#3
Masahide Saito, Noriyuki Kadoya, Kiyokazu Sato, Kengo Ito, Suguru Dobashi, Ken Takeda, Hiroshi Onishi, Keiichi Jingu
The purpose of this study was comparing dose-volume histogram (DVH)-based plan verification methods for volumetric modulated arc therapy (VMAT) pretreatment QA. We evaluated two 3D dose reconstruction systems: ArcCHECK-3DVH system (Sun Nuclear corp.) and Varian dynalog-based dose reconstruction (DBDR) system, developed in-house. Fifteen prostate cancer patients (67.6 Gy/26 Fr), four head and neck cancer patient (66 Gy/33 Fr), and four esophagus cancer patients (60 Gy/30 Fr) treated with VMAT were studied...
June 26, 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
#4
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
#5
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/28297327/small-field-detector-correction-factors-effects-of-the-flattening-filter-for-elekta-and-varian-linear-accelerators
#6
Madelaine K Tyler, Paul Z Y Liu, Christopher Lee, David R McKenzie, Natalka Suchowerska
Flattening filter-free (FFF) beams are becoming the preferred beam type for stereotactic radiosurgery (SRS) and stereotactic ablative radiation therapy (SABR), as they enable an increase in dose rate and a decrease in treatment time. This work assesses the effects of the flattening filter on small field output factors for 6 MV beams generated by both Elekta and Varian linear accelerators, and determines differences between detector response in flattened (FF) and FFF beams. Relative output factors were measured with a range of detectors (diodes, ionization chambers, radiochromic film, and microDiamond) and referenced to the relative output factors measured with an air core fiber optic dosimeter (FOD), a scintillation dosimeter developed at Chris O'Brien Lifehouse, Sydney...
May 2016: 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
#7
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/28296305/on-flattening-filter-free-portal-dosimetry
#8
Eduardo Pardo, Juan Castro Novais, María Yolanda Molina López, Sheila Ruiz Maqueda
Varian introduced (in 2010) the option of removing the flattening filter (FF) in their C-Arm linacs for intensity-modulated treatments. This mode, called flattening filter-free (FFF), offers the advantage of a greater dose rate. Varian's "Portal Dosimetry" is an electronic portal imager device (EPID)-based tool for IMRT verification. This tool lacks the capability of verifying flattening filter-free (FFF) modes due to saturation and lack of an image prediction algorithm. (Note: the latest versions of this software and EPID correct these issues...
July 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
#9
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/28048603/tu-h-bra-03-performance-of-a-clinical-gridded-electron-gun-in-magnetic-fields-implications-for-mri-linac-therapy
#10
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
#11
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
#12
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
#13
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
#14
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/28047526/th-ef-brc-00-tg-100-workshop
#15
Peter Dunscombe
This Hands-on Workshop will be focused on providing participants with experience with the principal tools of TG 100 and hence start to build both competence and confidence in the use of risk-based quality management techniques. The three principal tools forming the basis of TG 100's risk analysis: Process mapping, Failure-Modes and Effects Analysis and fault-tree analysis will be introduced with a 5 minute refresher presentation and each presentation will be followed by a 30 minute small group exercise. An exercise on developing QM from the risk analysis follows...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047023/th-ef-brc-03-fault-tree-analysis
#16
B Thomadsen
This Hands-on Workshop will be focused on providing participants with experience with the principal tools of TG 100 and hence start to build both competence and confidence in the use of risk-based quality management techniques. The three principal tools forming the basis of TG 100's risk analysis: Process mapping, Failure-Modes and Effects Analysis and fault-tree analysis will be introduced with a 5 minute refresher presentation and each presentation will be followed by a 30 minute small group exercise. An exercise on developing QM from the risk analysis follows...
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
#17
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/28046870/th-ef-brc-01-process-mapping
#18
P Dunscombe
This Hands-on Workshop will be focused on providing participants with experience with the principal tools of TG 100 and hence start to build both competence and confidence in the use of risk-based quality management techniques. The three principal tools forming the basis of TG 100's risk analysis: Process mapping, Failure-Modes and Effects Analysis and fault-tree analysis will be introduced with a 5 minute refresher presentation and each presentation will be followed by a 30 minute small group exercise. An exercise on developing QM from the risk analysis follows...
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
#19
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/28046572/tu-fg-201-09-predicting-accelerator-dysfunction
#20
C Able, C Nguyen, A Baydush, J Gersh, A Ndlovu, I Rebo, J Booth, M Perez, B Sintay, M Munley
PURPOSE: To develop an integrated statistical process control (SPC) framework using digital performance and component data accumulated within the accelerator system that can detect dysfunction prior to unscheduled downtime. METHODS: Seven digital accelerators were monitored for twelve to 18 months. The accelerators were operated in a 'run to failure mode' with the individual institutions determining when service would be initiated. Institutions were required to submit detailed service reports...
June 2016: Medical Physics
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