Measurements of isocenter path characteristics of the gantry rotation axis with a smartphone application

Medical Physics
H SchieferL Plasswilm

Abstract

For stereotactic radiosurgery, the AAPM Report No. 54 [AAPM Task Group 42 (AAPM, 1995)] requires the overall stability of the isocenter (couch, gantry, and collimator) to be within a 1 mm radius. In reality, a rotating system has no rigid axis and thus no isocenter point which is fixed in space. As a consequence, the isocenter concept is reviewed here. It is the aim to develop a measurement method following the revised definitions. The mechanical isocenter is defined here by the point which rotates on the shortest path in the room coordinate system. The path is labeled as "isocenter path." Its center of gravity is assumed to be the mechanical isocenter. Following this definition, an image-based and radiation-free measurement method was developed. Multiple marker pairs in a plane perpendicular to the assumed gantry rotation axis of a linear accelerator are imaged with a smartphone application from several rotation angles. Each marker pair represents an independent measuring system. The room coordinates of the isocenter path and the mechanical isocenter are calculated based on the marker coordinates. The presented measurement method is by this means strictly focused on the mechanical isocenter. The measurement result is available...Continue Reading

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Citations

Mar 21, 2016·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Juan Francisco Calvo OrtegaJoan Casals
Mar 21, 2017·Physics in Medicine and Biology·Hwiyoung KimSung-Joon Ye

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