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Radiation Dose Accuracy 81 the Isocenter : Standard Stereotactic Radiosurgery Technique Developed at Seoul National University Hospital  

Shin Seong Soo (Department of Therapeutic Radiology, Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine)
Kim Il Han (Department of Therapeutic Radiology, Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine)
Ha Sung Whan (Department of Therapeutic Radiology, Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine)
Park Charn Il (Department of Therapeutic Radiology, Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine)
Kang Wee-Saing (Department of Therapeutic Radiology, Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine)
Hur Sun Nyung (Department of Therapeutic Radiology, Institute of Radiation Medicine, Medical Research Center, Seoul National University College of Medicine)
Publication Information
Radiation Oncology Journal / v.20, no.4, 2002 , pp. 391-395 More about this Journal
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 co 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 ${\pm}3\%$. Therefore, further efforts such ws modification in processing of the archived image through DICOM3.0 format are required to lessen the dose difference.
Keywords
Stereotactic radiosurgery; Multi-purpose phantom; Isocenter dose;
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