ConferenceNeuro-Oncology · November 11, 2025
AbstractStereotactic radiosurgery (SRS) is standard of care for brain metastases, yet the selection criteria for performing upfront craniotomy are inconsistently defined. Among 1172 patients from two inst ...
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ConferenceJournal of Physics Conference Series · January 1, 2024
A comprehensive 3D dosimetry system consisting of the ClearView™ 3D dosimeter, VistaScan™ optical CT scanner, and VistaAce™ analysis software is commercially available and has the potential to be a strong verification tool with widespread applications. The ...
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ConferenceJournal of Physics Conference Series · January 24, 2022
We report our progress towards developing a clinical application of NIPAM kV-CBCT dosimetry. The goal is to develop a practical kV-MV isocenter verification test for which the measurement and analysis can be carried out quickly (within an hour), and that e ...
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ConferenceCancer Epidemiology, Biomarkers & Prevention · July 1, 2021
AbstractPurpose: The transition from 2-dimensional (2D) to 3-dimensional (3D) external beam radiation therapy (EBRT) can dramatically improve the quality of radiotherapy in low and middle-income countries (L ...
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ConferenceJournal of Physics Conference Series · August 29, 2019
We investigated the feasibility of using N-isopropylacrylamide (NIPAM) dosimeters with x-ray CT to verify radiosurgery dose. Dosimeters were prepared at one facility and shipped to a second facility for irradiation. A simulation CT was acquired and plans p ...
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ConferenceMedical Physics · June 2016
Purpose:Flattening filter free photon energies are commonly used for high dose treatments such as SBRT, where localization accuracy is essential. Often, MV cine imaging may be employed to verify correct localizati ...
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ConferencePract Radiat Oncol · 2016
OBJECTIVE: Our purpose was to address challenges associated with single-isocenter radiosurgery for multiple intracranial targets (SIRMIT) including increased sensitivity to rotational uncertainties (resulting from distance of the targets from isocenter) as ...
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ConferenceMed Phys · June 2013
PURPOSE: To evaluate the accuracy and sensitivity of a patient clinical objective IMRT QA tool using a 3D diode array. METHODS: A 3D QA device (Delta4, Scandidos Inc.) with 2 orthogonal diode array planes was used for IMRT QA. The diode spacing is 5mm in c ...
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ConferenceMed Phys · June 2013
PURPOSE: Volumetric modulated arc therapy (VMAT) is a relatively new treatment modality for dynamic photon radiation therapy. Pre-treatment quality assurance (QA) is necessary and many efforts have been taken to apply electronic portal imaging device (EPID ...
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ConferenceMed Phys · June 2013
PURPOSE: Correct MLC modeling is essential to the accurate IMRT delivery. Most TPSs use simplified models with parameters of leaf transmission (LT) and dynamic leaf gap (DLG). The common way to determine them is through extrapolation from measurements. In ...
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ConferenceJ Phys Conf Ser · 2013
We describe a method to directly measure the radial dose and anisotropy functions of brachytherapy sources using polyurethane based dosimeters read out with optical CT. We measured the radial dose and anisotropy functions for a Cs-137 source using a PRESAG ...
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ConferenceMedical Physics · January 1, 2011
Purpose: In VMAT, the dose rate, MLC position, and gantry angle change simultaneously, it is important they follow their predefined trajectories to ensure correct dose delivery. Our purpose is to develop an efficient VMAT QA strategy using EPID that is cap ...
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ConferenceMedical Physics · January 1, 2010
Purpose: To propose a novel method of acquiring Maximum Intensity Projection (MIP) images using multi‐slice cine MRI, termed as MRI‐MIP, and to evaluate its feasibility in quantifying motion magnitude. Materials and Methods: MRI‐MIP images are acquired usi ...
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ConferenceMedical Physics · January 1, 2010
Purpose: A 15–30s Breath Hold (BH) is often used in radiation therapy for breast cancer patients to minimize heart dose, however its effect on tumor oxygenation and radiosensitivity is unknown. The purpose of this study is to utilize published data on the ...
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ConferenceMedical Physics · January 1, 2009
Purpose: Many dosimetric evaluations of prostate intrafraction motion disregard effects of treatment duration and translations of the surrounding body per fraction. However the probability of motion has been shown to increase with time and image guidance s ...
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ConferenceMedical Physics · January 1, 2009
Purpose: Prostate intrafraction motion has been shown to be patient specific; however most current compensation strategies are population wide. We evaluate the feasibility of applying margins based on a subpopulation of patients with similar intrafraction ...
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ConferenceMedical Physics · January 1, 2008
Purpose: Recent studies of prostate intrafraction motion have been inconclusive. One cine‐MRI study demonstrated that pre‐treatment rectal filling status is a significant predictor of intrafraction motion magnitude. However, studies using the Calypso syste ...
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ConferenceMedical Physics · January 1, 2008
Purpose: Commercially available gantry mounted kV imagers are currently restricted to manual fluoroscopy acquisitions with fixed mAs & frame rate, limiting use of fluoroscopy for prostate intrafraction motion measurement. For consideration in future acquis ...
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ConferenceMed Dosim
This study aimed to report hippocampal dose from single-fraction stereotactic radiosurgery (SRS) for 4 to 10 brain metastases and determine feasibility of hippocampal-sparing SRS. Patients with 4 to 10 brain metastases receiving single-isocenter, multi-tar ...
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