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KMID : 1151820210150020239
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Journal of the Korean Society of Radiology
2021 Volume.15 No. 2 p.239 ~ p.246
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Comparison of Linac-based VMAT Stereotatic Radiosurgery and Conventional Stereotatic Radiosurgeryfor Multiple Brain Lesions
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Jang Eun-Sung
Chang Bo-Seok
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Abstract
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Portal Dosimetry was verified using EPID to secure the clinical application and reliability of the existing research dose evaluation. The dose distribution of Geant4 was compared with the measured value by 360° rotational irradiation with a 2.5 cm cone for stereotactic brain surgery. To confirm the dose distribution of patients with brain metastasis, the dose distribution investigated by inserting a Gafchromic EBT film into the parietal phantom and the dose distribution obtained from the parietal phantom using VMAT are compared and applied to actual patients. As a result of the analysis, it was confirmed that the accuracy of the beam center and the center of the couch coincide accurately with an error within 1mm as a result of QA through a pin ball. In addition, it was confirmed that the EBT3 film has excellent linearity in the range of 0 to 10 Gy according to various dose irradiation. In the same setting as the two cervical phantoms, we confirm that the implementation and simulation results calculations of dose calculations based on Geant4 using photon beams match the experimental data within the treatment planning volume (PTV). Therefore, volume modulated arc treatment (VMAT) 360° rotational irradiation was performed, and the result of iso-dose distribution analysis by rotational irradiation confirmed that it is appropriate to include a virtual tumor.
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KEYWORD
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Geant4 simulation, Alderson rando phantom, SRS(stereotactic radiosurgery), dose distribution, VMAT
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