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J Korean Soc Ther Radiol Oncol > Volume 20(4); 2002 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 2002;20(4): 391-395.
Radiation Dose Accuracy at the Isocenter: Standard Stereotactic Radiosurgery Technique Developed at Seoul National University Hospital
Seong Soo Shin, Il Han Kim, Sung Whan Ha, Charn Il Park, Wee Saing Kang, Sun Nyung Hur
1Department of Therapeutic Radiology, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea. ihkim@snu.ac.kr
2Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine, Seoul, Korea.
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.
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.
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.
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.
Key Words: Stereotactic radiosurgery, Multi-purpose phantom, Isocenter dose
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