Publications by authors named "Kazuharu Nishitani"
[Development of Isocenter Measurement Method Considering the Displacement of the Focal-spot Position of a Medical Linear Accelerator].
Nihon Hoshasen Gijutsu Gakkai Zasshi
December 2024
Article Synopsis
- The study focuses on measuring beam alignment in medical linear accelerators, emphasizing the importance of analyzing focal spot positions to ensure accurate radiation delivery.
- The newly developed Quality Control Tool (QCT) device facilitates simultaneous tests of light/radiation field coincidence and isocenter testing, enabling effective analysis of focal spots with specific software.
- Results show that focal spot position varies with gantry angle, showcasing the QCT's capacity to accurately measure displacements and assess beam alignment without interference from the jaw collimator.
Purpose: The in-room laser which is used for patient positioning in radiotherapy is generally projected on the radiation isocenter determined by the Winston-Lutz test and so on. In this study, a couch-mounted verification device was developed that could evaluate all in-room lasers' alignment including the horizontality and verticality at one time. The device has the function to perform the light/radiation field coincidence test and the Winston-Lutz test at the same time.
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