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KMID : 0982820060050020089
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Journal of Lung Cancer
2006 Volume.5 No. 2 p.89 ~ p.91
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On-line Setup for Lung Cancer Patient in Stereotactic Radiation Surgery using CBCT
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Park Sung-Ho
Choi Eun-Kyung
Ahn Seung-Do
Lee Sang-Wook
Shin Seong-Soo
Kim Jong-Hoon
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Abstract
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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?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 min for CT reconstruction of 2.5 mm slice thickness, 1∼2 min for on-line setup using image registration).
Conclution: The accurate treatment could be performed after tumor localization for SRS using CBCT images. And the consumed time for tumor localization was reduced significantly.
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KEYWORD
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Cone beam CT, Stereotactic radiation surgery, Lung cancer, Image guided radiation therapy
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