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https://www.readbyqxmd.com/read/28048932/th-b-204-03-tg-199-implanted-markers-for-radiation-treatment-verification
#1
Z Wang
: Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048898/mo-fg-brc-03-design-and-construction-of-a-dielectiric-wall-accelerator
#2
D Westerly
Experimental research in medical physics has expanded the limits of our knowledge and provided novel imaging and therapy technologies for patients around the world. However, experimental efforts are challenging due to constraints in funding, space, time and other forms of institutional support. In this joint ESTRO-AAPM symposium, four exciting experimental projects from four different countries are highlighted. Each project is focused on a different aspect of radiation therapy. From the USA, we will hear about a new linear accelerator concept for more compact and efficient therapy devices...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048478/th-b-204-01-real-time-tracking-with-implanted-markers
#3
Q Xu
: Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048255/su-d-brb-04-nomogram-for-prediction-comparison-and-evaluation-of-dose-to-normal-tissue-in-srs-planning
#4
A Templeton, Y Liao, A Diaz, J Turian
PURPOSE: Radiosurgery of brain metastases is a unique treatment planning subset in which the treatment approach, high conformality and steep dose gradients are relatively invariant with varying location, size and shape of the target. Prescription doses are generally limited by the size of tumor or amount of surrounding normal brain receiving intermediate doses. We tabulated our treatment plans to establish a nomogram which provides planning expectations, useful for patient scheduling, planning efficiency, and training purposes...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048246/mo-fg-brc-04-ionacoustic-imaging-for-particle-range-verification
#5
K Parodi
Experimental research in medical physics has expanded the limits of our knowledge and provided novel imaging and therapy technologies for patients around the world. However, experimental efforts are challenging due to constraints in funding, space, time and other forms of institutional support. In this joint ESTRO-AAPM symposium, four exciting experimental projects from four different countries are highlighted. Each project is focused on a different aspect of radiation therapy. From the USA, we will hear about a new linear accelerator concept for more compact and efficient therapy devices...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048209/su-f-p-55-testicular-scatter-dose-determination-during-prostate-sbrt-with-and-without-pelvic-lymph-nodes
#6
C Venencia, A Germanier, E Garrigo, P Castro Pena, J Torres, S Zunino
PURPOSE: The elective irradiation of pelvis lymph node for prostate cancer is still controversial. Including pelvic lymph node as part of the planning target volume could increase the testicular scatter dose, which could have a clinical impact. The objective of this work was to measure testicular scatter dose for prostate SBRT treatment with and without pelvic lymph nodes using TLD dosimetry. METHODS: A 6MV beam (1000UM/min) produce by a Novalis TX (BrainLAB-VARIAN) equipped HDMLC was used...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047909/tu-fg-201-07-development-of-srs-conical-collimator-collision-prediction-software-for-radiation-treatment-safety
#7
V Gutti, A Morrow, S Kim, M Patel
PURPOSE: Stereotactic radiosurgery (SRS) treatments using conical collimators can potentially result in gantry collision with treatment table due to limited collision-clear spaces. An in-house software was developed to help the SRS treatment planner mitigate potential SRS conical collimator (Varian Medical System, Palo Alto, CA) collisions with the treatment table. This software was designed to remove treatment re-planning secondary to unexpected collisions. METHODS: A BrainLAB SRS ICT Frameless Extension used for SRS treatments in our clinic was mathematically modelled using surface points registered to the 3D co-ordinate space of the couch extension...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047905/su-f-t-493-an-investigation-into-the-feasibility-of-using-pipspro-software-with-film-for-linac-qa
#8
R Underwood
PURPOSE: To determine the feasibility of using radiochromic and radiographic film with Pipspro software for quality assurance of linear accelerators with no on-board imaging. METHODS: The linear accelerator being used is a Varian Clinac 21EX. All IGRT is performed using the BrainLab ExacTrac system. Because of the lack of on board imaging, certain monthly and annual TG-142 quality assurance tests are more difficult to perform and analyze to a high degree of accuracy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047824/th-b-204-02-application-of-implanted-markers-in-proton-therapy
#9
S Park
: Implanted markers as target surrogates have been widely used for treatment verification, as they provide safe and reliable monitoring of the inter- and intra-fractional target motion. The rapid advancement of technology requires a critical review and recommendation for the usage of implanted surrogates in current field. The symposium, also reporting an update of AAPM TG 199 - Implanted Target Surrogates for Radiation Treatment Verification, will be focusing on all clinical aspects of using the implanted target surrogates for treatment verification and related issues...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047703/su-f-p-31-dosimetric-effects-of-roll-and-pitch-corrections-using-robotic-table
#10
M Mamalui, Z Su, S Flampouri, Z Li
PURPOSE: To quantify the dosimetric effect of roll and pitch corrections being performed by two types of robotic tables available at our institution: BrainLabTM 5DOF robotic table installed at VERO (BrainLab&MHI) dedicated SBRT linear accelerator and 6DOF robotic couch by IBA Proton Therapy with QFixTM couch top. METHODS: Planning study used a thorax phantom (CIRSTM), scanned at 4DCT protocol; targets (IGTV, PTV) were determined according to the institutional lung site-specific standards...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047688/su-f-t-622-comparative-analysis-of-pencil-beam-and-anisotropic-analytical-algorithm-aaa-for-stereotactic-body-radiation-therapy-sbrt-of-thoracic-spine
#11
R Badkul, W Nicolai, D Pokhrel, T Ramanjappa, H Jiang, F Wang, C Lominskac
PURPOSE: To compare the impact of Pencil Beam(PB) and Anisotropic Analytic Algorithm(AAA) dose calculation algorithms on OARs and planning target volume (PTV) in thoracic spine stereotactic body radiation therapy (SBRT). METHODS: Ten Spine SBRT patients were planned on Brainlab iPlan system using hybrid plan consisting of 1-2 non-coplanar conformal-dynamic arcs and few IMRT beams treated on NovalisTx with 6MV photon. Dose prescription varied from 20Gy to 30Gy in 5 fractions depending on the situation of the patient...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047668/su-f-t-577-comparison-of-small-field-dosimetry-measurements-in-fields-shaped-with-conical-applicators-on-two-different-accelerating-systems
#12
B Muir, M McEwen, J Belec, E Christiansen, E Vandervoort
PURPOSE: To investigate small field dosimetry measurements and associated uncertainties when conical applicators are used to shape treatment fields from two different accelerating systems. METHODS: Output factor measurements are made in water in beams from the CyberKnife radiosurgery system, which uses conical applicators to shape fields from a (flattening filter-free) 6 MV beam, and in a 6 MV beam from the Elekta Precise linear accelerator (with flattening filter) with BrainLab external conical applicators fitted to shape the field...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047613/su-f-t-595-pitfalls-of-the-radiosurgery-conformity-index-reported-by-the-brainlab-treatment-planning-system
#13
N Mensah-Brown, H Saleh
PURPOSE: To propose a new method to more accurately compute the conformity index (CI) for stereotactic radiosurgery patients with multiple lesions planned with the BrainLab iPlan treatment planning system. METHODS: The dose files of the patients being studied were exported from the BrainLab iPlan system to VelocityAI, an imaging informatics software tool that provides an independent method of assessing the quality of treatment plans. An independent method of calculating CI is necessary as BrainLab incorrectly reports CI for multiple lesions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047599/su-f-t-515-increased-skin-dose-in-supine-craniospinal-irradiation-due-to-carbon-fiber-couch-and-vacuum-bag-immobilization-device
#14
D Robertson, Z Zhao, X Wang, J Yang
PURPOSE: To measure the surface dose for supine craniospinal irradiation employing posterior beams, treating through an imaging couch and BlueBag immobilization device. METHODS: The percentage depth dose (PDD) in the buildup region of a clinical 6 MV photon beam was measured using an Advanced Markus parallel plate ionization chamber in a solid water phantom. The PDD from a 10×10 cm(2) anterior beam was measured at 100 cm SSD, simulating a traditional prone craniospinal technique...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047570/su-f-t-618-evaluation-of-a-mono-isocentric-treatment-planning-software-for-stereotactic-radiosurgery-of-multiple-brain-metastases
#15
E Sham, M Sattarivand, L Mulroy, M Yewondwossen
PURPOSE: To evaluate planning performance of an automated treatment planning software (BrainLAB; Elements) for stereotactic radiosurgery (SRS) of multiple brain metastases. METHODS: Brainlab's Multiple Metastases Elements (MME) uses single isocentric technique to treat up to 10 cranial planning target volumes (PTVs). The planning algorithm of the MME accounts for multiple PTVs overlapping with one another on the beam eyes view (BEV) and automatically selects a subset of all overlapping PTVs on each arc for sparing normal tissues in the brain...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047547/su-f-t-647-linac-based-stereotactic-radiosurgery-srs-in-the-treatment-of-trigeminal-neuralgia-detailed-description-of-srs-procedural-technique-and-reported-clinical-outcomes
#16
D Pokhrel, S Sood, R Badkul, H Jiang, T Stepp, P Camarata, F Wang
PURPOSE: SRS is an effective non-invasive alternative treatment modality with minimal-toxicity used to treat patients with medically/surgically refractory trigeminal neuralgia root(TNR) or those who may not tolerate surgical intervention. We present our linac-based SRS procedure for TNR treatment and simultaneously report our clinical outcomes. METHODS: Twenty-eight TNR-patients treated with frame-based SRS at our institution (2009-2015) with a single-fraction point-dose of 60-80Gy to TNR were included in this IRB-approved study...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047496/su-g-brb-17-dosimetric-evaluation-of-the-respiratory-interplay-effect-during-vmat-delivery-using-ipagat-polymer-gel-dosimeter
#17
K Ono, S Fujimoto, S Hayashi, K Hioki, M Miyazawa, Y Akagi, Y Hirokawa
PURPOSE: To evaluate the dosimetric impact of the interplay effect between multileaf collimator (MLC) movement and tumor respiratory motion during delivery of volumetric modulate arc therapy (VMAT) by using customized polymer gel dosimeter. METHODS: Polyacrylamide-based gel dosimeter contained magnesium chloride as a sensitizer (iPAGAT) was used in this study. An excellent gas barrier PAN (BAREX) techno bottle (φ8 cm, 650 mL) filled with iPAGAT was set to the QUASAR™ respiratory motion phantom, and was moved with motion amplitudes of 1 and 2 cm with a 4 second period during VMAT delivery by the Novalis Tx linear accelerator (Varian/BrainLAB)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047462/mo-fg-brc-00-joint-aapm-estro-symposium-advances-in-experimental-medical-physics
#18
Ross Berbeco, Dan Ionascu
Experimental research in medical physics has expanded the limits of our knowledge and provided novel imaging and therapy technologies for patients around the world. However, experimental efforts are challenging due to constraints in funding, space, time and other forms of institutional support. In this joint ESTRO-AAPM symposium, four exciting experimental projects from four different countries are highlighted. Each project is focused on a different aspect of radiation therapy. From the USA, we will hear about a new linear accelerator concept for more compact and efficient therapy devices...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047362/su-f-j-24-setup-uncertainty-and-margin-of-the-exactrac-6d-image-guide-system-for-patients-with-brain-tumors
#19
S Kim, S Oh, J Yea, J Park
PURPOSE: This study evaluated the setup uncertainties for brain sites when using BrainLAB's ExacTrac X-ray 6D system for daily pretreatment to determine the optimal planning target volume (PTV) margin. METHODS: Between August 2012 and April 2015, 28 patients with brain tumors were treated by daily image-guided radiotherapy using the BrainLAB ExacTrac 6D image guidance system of the Novalis-Tx linear accelerator. DUONTM (Orfit Industries, Wijnegem, Belgium) masks were used to fix the head...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047337/su-f-j-42-comparison-of-varian-truebeam-cone-beam-ct-and-brainlab-exactrac-x-ray-for-cranial-radiotherapy
#20
J Li, W Shi, D Andrews, M Werner-Wasik, B Lu, Y Yu, A Dicker, H Liu
PURPOSE: To compare online image registrations of TrueBeam cone-beam CT (CBCT) and BrainLab ExacTrac x-ray imaging systems for cranial radiotherapy. METHOD: Phantom and patient studies were performed on a Varian TrueBeam STx linear accelerator (Version 2.5), which is integrated with a BrainLab ExacTrac imaging system (Version 6.1.1). The phantom study was based on a Rando head phantom, which was designed to evaluate isocenter-location dependence of the image registrations...
June 2016: Medical Physics
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