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KMID : 1164220180300010201
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Journal of Korean Society for Radiotherapeutic Technology
2018 Volume.30 No. 1 p.201 ~ p.208
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Evaluation of Combine IGRT using ExacTrac and CBCT In SBRT
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Ahn Min-Woo
Kang Hyo-Seok
Choi Byoung-Joon
Park Sang-Jun
Jung Da-Ee
Lee Geon-Ho
Lee Du-Sang
Jeon Myeong-Su
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Abstract
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Purpose : The purpose of this study is to compare and analyze the set-up errors using the Combine IGRT with ExacTrac and CBCT phased in the treatment of Stereotatic Body Radiotherapy.
Methods and materials : Patient who were treated Stereotatic Body Radiotherapy in the ulsan university hospital from May 2014 to november 2017 were classified as treatment area three brain, nine spine, three pelvis. First using ExacTrac Set-up error calibrated direction of Lateral(Lat), Longitudinal(Lng), Vertical(Vrt), Roll, Pitch, Yaw, after applied ExacTrac moving data in addition to use CBCT and set-up error calibrated direction of Lat, Lng, Vrt, Rotation(Rtn).
Results : When using ExacTrac, the error in the brain region is Lat 0.18±0.25 cm, Lng 0.23±0.04 cm, Vrt 0.30±0.36 cm, Roll 0.36±0.21°, Pitch 1.72±0.62°, Yaw 1.80±1.21°, spine Lat 0.21±0.24 cm, Lng 0.27±0.36 cm, Vrt 0.26±0.42 cm, Roll 1.01±1.17°, Pitch 0.66±0.45°, Yaw 0.71±0.58°, pelvis Lat 0.20±0.16 cm, Lng 0.24±0.29 cm, Vrt 0.28±0.29 cm, Roll 0.83±0.21°, Pitch 0.57±0.45°, Yaw 0.52±0.27° When CBCT is performed after the couch movement, the error in brain region is Lat 0.06±0.05 cm, Lng 0.07±0.06 cm, Vrt 0.00±0.00 cm, Rtn 0.0±0.0°, spine Lat 0.06±0.04 cm, Lng 0.16±0.30 cm, Vrt 0.08±0.08 cm, Rtn 0.00±0.00°, pelvis Lat 0.06±0.07 cm, Lng 0.04±0.05 cm, Vrt 0.06±0.04 cm, Rtn 0.0±0.0°.
Conclusion : Combine IGRT with ExacTrac in addition to CBCT during Stereotatic Body Radiotherapy showed that it was possible to reduce the set-up error of patients compared to single ExacTrac. However, the application of Combine IGRT increases patient set-up verification time and absorption dose in the body for image acquisition. Therefore, depending on the patient’s situation that using Combine IGRT to reduce the patient’s set-up error can increase the radiation treatment effectiveness.
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KEYWORD
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ExacTrac, CBCT, Combine IGRT
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