Radiation Dose Accuracy at the Isocenter: Standard Stereotactic Radiosurgery Technique Developed at Seoul National University Hospital .
- Author:
Seong Soo SHIN
1
;
Il Han KIM
;
Sung Whan HA
;
Charn Il PARK
;
Wee Saing KANG
;
Sun Nyung HUR
Author Information
1. Department of Therapeutic Radiology, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea. ihkim@snu.ac.kr
- Publication Type:Original Article
- Keywords:
Stereotactic radiosurgery;
Multi-purpose phantom;
Isocenter dose
- MeSH:
Head;
Radiometry;
Radiosurgery*;
Rage;
Seoul*;
Silicon
- From:The Journal of the Korean Society for Therapeutic Radiology and Oncology
2002;20(4):391-395
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To confirm the accuracy of the radiation dose at the isocenter by the standard linear accelerator-based stereotactic radiosurgery technique which was developed at Seoul National University Hospital. MATERIALS AND METHODS: Radiation dosimetry was undertaken during standard 5-arc radiosurgery using 6 MV X-ray beam from CL2100C linac. The treatment head was attached with circular tertiary collimators of 10 and 20 mm diameter. We measured the absorbed dose at the isocenter of a multi-purpose phantom using two kinds of detector : a 0.125 cc ionization chamber and a silicon diode detector. RESULTS: The dose differences at each arc plane between the planned dose and the measured dose at the isocenter raged from -0.73% to -2.69% with the 0.125 cc ion chamber, and from -1.29% to -2.91% with the diode detector during radiosurgery with the tertiary collimator of 20 mm diameter. Those with the 10-mm tertiary collimator ranged from -2.39% to -4.25% with the diode. CONCLUSION: The dose accuracy at the isocenter was +/-3%. Therefore, further efforts such as modification in processing of the archived image through DICOM3.0 format are required to lessen the dose difference.
