Journal of Yeungnam Medical Science

Original Articles

Cone-Beam CT Image-Guided Radiosurgery of Brain Metastasis : Technical Note and Clinical Application: Sei-One Shin, Sang Mo Yun; Yeungnam Univ J Med. 2007;24(2 Suppl):S591-597. Published online December 31, 2007; DOI: https://doi.org/10.12701/yujm.2007.24.2S.S591

Abstract PDF: Background
：This study was performed to test feasibility of CBCT(cone-beam computerized tomography) guided radiosurgery. Materials and Methods：We used CBCT which was mounted on a retractable arm at 90° to the treatment source. CBCT images were overlapped on the digitally reconstructed images from simulation CT scan. Then, 3 dimensional volumetric CT image matching was performed. If there were any positioning errors, automated patient re-positioning was done.
Results
：A radiosurgery treatment plan was carried out with a set of specially designed multiple non-coplanar arcs. The goal of plan was to deliver single session 18 Gy at periphery of the target. We treated a patient with a solitary brain metastasis from left upper lung cancer. Serial imaging study for treatment response revealed a satisfactory result with no remarkable treatment related side effects.
Conclusion
：CBCT image guided radiosurgery system is very simple and could be a convenient image guiding modality for stereotactic radiosurgery or fractionated radiotherapy with an acceptable geometric accuracy and radiation exposure.

The Dosimetry of Radiosurgery using of Rando Phantom.: Sung Kyu Kim, Sei One Shin, Myung Se Kim; Yeungnam Univ J Med. 1990;7(1):113-119. Published online June 30, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.1.113

Abstract PDF: The stereotactic radiosurgery using ionizing radiation of high energy is a technique for exadicating intracranial small tumors, which are inaccessible or unsuitable for open surgical technique. For such a small field radiosurgery, TLD or film dosimetry is essential. The three dimensional dose planning of radiosurgery was performed with dose planning computer system (Therac 2300). The target dose distribution and its error according to patient position were discussed. And were measured of circular cone which specially designed in our Hospital. The position error of Rando Phantom compared with CT were 0.4 mm in the AP-LAT section and in the AP-VERT section, 1.0 mm in the AP-VERT 45°section. The ratio of accuracy of the gantry and couch rotation were 1.5 mm diameter for central axis of 18MeV linear accelerator. Our study suggested that radiosurgery of small field in out department will be appropriate for clinical application.

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