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KMID : 1164220140260010069
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 1 p.69 ~ p.76
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Analysis of target volume motion followed by induced abdominal compression in tomotherapy for prostate cancer
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Oh Jeong-Hun
Jeong Geon-A
Jung Won-Seok
Jo Jun-Young
Kim Gi-Chul
Choi Tae-Gu
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Abstract
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Purpose : To evaluate the changes of the motion of abdominal cavity between interfraction and intrafraction by using
abdominal compression for reducing abdominal motion.
Materials and Methods : 60 MVCT images were obtained before and after tomotherapy from 10 prostate cancer patients
over the whole radiotherapy period. Shift values ( X -lateral Y -longitudinal Z -vertical and Roll ) were measured and from it , the correlation of between interfraction set up change and intrafraction target motion was analyzed when applying abdominal compression.
Results : The motion changes of interfraction were X- average 0.65±2.32mm, Y-average 1.41±4.83mm, Z-average 0.73±
0.52mm and Roll-average 0.96±0.21mm. The motion changes of intrafraction were X-average 0.15±0.44mm, Y-average 0.13 ±0.44mm, Z-average 0.24±0.64mm and Roll- average 0.1±0.9mm. The average PTV maximum dose difference was minimum for 10% phase and maximum for 70% phase. The average Spain cord maximum dose difference was minimum for 0% phase and maximum for 50% phase. The average difference of V20, V10, V5 of Lung show bo certain trend.
Conclusion : Abdominal compression can minimize the motion of internal organs and patients. So it is considered to be able to get more ideal dose volume without damage of normal structures from generating margin in small in producing PTV.
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KEYWORD
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interfraction, intrafraction, tomotherapy
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