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KMID : 1164220190310010067
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Journal of Korean Society for Radiotherapeutic Technology
2019 Volume.31 No. 1 p.67 ~ p.74
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An investigation Of IntraFraction Motion Correction For Lung Stereotactic Body Radiation Therapy By Using IntraFraction Cone Beam Computed Tomography
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Song Hyeong-Seok
Cho Kang-Chul
Park Hyo-Kuk
Yoon Jong-Won
Cho Jeong-Hee
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Abstract
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Purpose : The purpose is to correct for position errors caused by long treatment times. By correcting the target motion that can occur during lung SBRT using IntraFraction CBCT.
Methods and materials : We analyzed retrospectively the IFM data of 14 patients with two treatment arc in the treatment plan for lung cancer with stereotactic radiotherapy. An IntraFraction Motion was applied to the Arccheck phantom to acquire the Gamma index data.
Results : IntraFraction Motion during the first treatment arc is in the left-right(LR), superiorinferior(SI), anterior-posterior(AP) directions were 0.16±0.05 cm, 0.72 cm(max error), 0.2±0.14 cm, 1.26 cm, 0.24±0.08 cm, 0.82 cm and rotational directions was 0.84±0.23°, 2.8°(pitch), 0.72±0.23°, 2.5°(yaw), 0.7±0.19°, 2°(roll). IntraFraction Motion during the second treatment arc is in the LR, SI, AP directions were 0.1±0.04 cm, 0.37 cm, 0.14±0.17 cm, 2 cm, 0.12±0.04 cm, 0.5 cm and rotational directions was 0.45±0.12°, 1.3°, 0.37±0.1°, 1°, 0.35±0.1°, 1.2°. Gamma index pass rates were 82.64±10.51 %, 48.4 %.
Conclusions : In this study, we examined the validity of IntraFraction Motion correction in lung SBRT and the efficiency of IntraFraction CBCT. Due to the nature of SBRT treatment, IFM may increase due to the increased treatment time. It is believed that the increase in IFM with the increase in treatment time can be improved with the use of FFF Beam and additional position correction using CBCT during treatment.
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KEYWORD
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SBRT, IntraFraction CBCT, IntraFraction Motion
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