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KMID : 1164220130250020159
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Journal of Korean Society for Radiotherapeutic Technology
2013 Volume.25 No. 2 p.159 ~ p.165
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Study of Dynamic Variation Aspect in Lung Volume due to Respiration in Stereotactic Body Radiotherapy Using Abdominal Compressor
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Park Kwang-Soon
Kim Joo-Ho
Park Hyo-Kuk
Baek Jong-Geal
Lee Sang-Kyu
Yoon Jong-Won
Cho Jung-Heui
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Abstract
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Purpose: Abdominal compressor is used to control breathing in stereotactic body radiotherapy for lung tumors
frequently. We evaluated the dynamic variation aspect of internal tumor volume by breathing.
Materials and Methods: We reviewed 20 lung cancer patients (7 upper lung patients, 4 middle lung patients, 9
lower lung patients) who received stereotactic body radiotherapy using abdominal compressor between April 2012
to April 2013. Coordinate shift values were obtained by using four-dimensional cone-beam CT (4D-CBCT) to
investigate treatment set-up error and moving tumor position error. To investigate how much difference of each
part, we compared 95% confidence interval, maximum values and minimum values of three-dimensional vector
value and analyzed conformity degree through the Pearson square correlation coefficient.
Results: 95% confidence interval of three-dimensional vector value of each part is 1.8∼2.9 mm in upper lobe, 2.3
∼5.4 mm in middle lobe and 2.2∼4.0 mm in lower lobe. Conformity degree was the result that respectively is LR
direction 0.75, SI direction 0.68 and AP direction 0.63 in upper lobe, LR direction 0.82, SI direction 0.51 and AP
direction 0.92 in middle lobe and LR direction 0.63, SI direction 0.50 and AP direction 0.34 in lower lobe.
Conclusion: We showed difference by each site in lung tumor due to respiration by using abdominal compressor.
Therefore, we must correct treatment set-up error as well as moving tumor position error by breathing. It is also
considered to be useful that it is the use of 4D-CBCT when correcting the error due to various dynamic variation.
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KEYWORD
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stereotactic body radiotherapy (SBRT), 4D-cone beam CT, abdominal compressor
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