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Abstract
Purpose
On-line setup procedure was performed before treatment for lung cancer patient for stereotactic radiation surgery (SRS) using recently introduced Cone Beam CT.
Materials and Methods:
Cone Beam CT was performed for 10 patients who did SRS during 18 July and 1 September, 2006 using On Board Imager (OPB) system made by Varian, USA. The treatment position of patient was corrected comparing Images obtaining from CBCT and used in treatment planning.
Results:
Comparing the CBCT images and CT images used in treatment planning, the movement of the couch is 2,3±2+3 mm, 1.8士 2.8 mm, 0.3±3.5 mm for vertical, lateral, and longitudinal direction. It took about 1 hr for conventional treatment procedure in image acquisition of CT before treatment and image registration. But it took about 4-7 minute in on-line setup using CBCT (1 〜2 min for image acquisition using CBCT, 2~3 miri for CT reconstruction of 2.5 mm slice thickness, 1 -2 min for on-line setup using image registration).
REFERENCES
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2.Lee SW., Choi EK: Park HJ, et al. Stereotactic body frame based fractionated radiosurgery on consecutive days for primary or metastatic tumors in the lung. Lung Cancer. 2003. 40:309–315. ,.
3.Choi WS: Song SY., Kim JH, et al. Clinical results of stereotactic body frame based radiation therapy for primary or metastatic tumors in the lung. The 24th Annual Meeting of the Korean Society for Therapeutic Radiology and Oncology 2006,.
4.Song SY., Park SH., Shin SS, et al. Image-guided radiation therapy for stereotactic radiosurgery in lung tumor. The 24th Annual Meeting of the Korean Society for Therapeutic Radiology and Oncology. 2006.
Fig. 1.
On Board Imager (OBI) system installed on the conventional Unac. A X-ray generator is shown in the left side, and the detector is shown in the right side.
Fig. 2.
Cone Beam CT (CBCT) images obtained using On Board Imager (OBI) system. The original planned CT images are shown in the right upper, and the other images are CBCT images with gross tumor volume (GTV), planning target volume (PTV) contoured in the planned CT images. The correction shift value of the couch are shown in the lower part.
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