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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. |
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| 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. |
| Key Words:
Stereotactic radiosurgery, Multi-purpose phantom, Isocenter dose |
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