Dec 7, 2019

MRIgRT Head and Neck Anthropomorphic QA Phantom: Design, Development, Reproducibility and Feasibility Study

Medical Physics
Angela SteinmannDavid S Followill

Abstract

The purpose of this paper was to design, manufacture, and evaluate a tissue equivalent, dual MR/CT visible anthropomorphic Head and Neck (H&N) phantom. This phantom was specially designed as an end-to-end quality assurance (QA) tool for magnetic resonance (MR) imaging guided radiotherapy (MRIgRT) systems participating in NCI-sponsored clinical trials. The MRIgRT H&N phantom was constructed using a water-fillable acrylic shell and a custom insert that mimics an organ at risk (OAR) and target structures. The insert consists of a primary and secondary PTV manufactured of a synthetic Clear Ballistic gel, an acrylic OAR and surrounding tissue fabricated using melted Superflab. Radiochromic EBT3 film and TLDs were used to measure the dose distribution and absolute dose, respectively. The phantom was evaluated by conducting an end-to-end test that included: imaging on a GE Lightspeed CT simulator, planning on Monaco treatment planning software (TPS), verifying treatment setup with MR and irradiating on Elekta's 1.5T Unity MR linac system. The phantom was irradiated three times using the same plan to determine reproducibility. Three institutions, equipped with either ViewRay MRIdian 60 Co or ViewRay MRIdian Linac, were used to conduct ...Continue Reading

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Mentioned in this Paper

Computer Software
Radiosurgery, Linear Accelerator
Study
Magnetic Resonance Imaging
Acrylic Dental Material
Cardiovascular Risk Factor
Institution
Axial
GG2-1 protein, human
Clinic/Center - Oncology, Radiation

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