RT Journal Article
SR Electronic
T1 Potential Pitfalls of Diaphragm Structural Matching in Carbon-ion Radiotherapy for Pancreatic Cancer
JF Anticancer Research
JO Anticancer Res
FD International Institute of Anticancer Research
SP 4351
OP 4356
DO 10.21873/anticanres.13603
VO 39
IS 8
A1 ITABASHI, YUSUKE
A1 KUBOTA, YOSHIKI
A1 OKAMOTO, MASAHIKO
A1 TSUDA, KAZUHISA
A1 SHIBA, SHINTARO
A1 HOSHINO, YOSHIHIKO
A1 SUTO, TAKAYUKI
A1 OHNO, TATSUYA
A1 NAKANO, TAKASHI
YR 2019
UL http://ar.iiarjournals.org/content/39/8/4351.abstract
AB Background/Aim: To evaluate the effectiveness of diaphragm matching (DM) for carbon-ion radiotherapy (CIRT) of pancreatic cancer patients and develop a simple method to estimate tumour position. Patients and Methods: Treatment planning CTs from 27 pancreatic cancer patients treated with CIRT in our facility were used in this study, and 32 other CT image datasets taken on different days were used for measuring tumour and diaphragm displacements. A correction method (SI-correction) was developed using the coefficient x of the regression line formula for the displacements between the diaphragm and tumour in the superior–inferior direction. The tumour positioning errors of bone matching (BM), DM, and SI-correction were measured. Results: Mean (±standard deviation) absolute errors of BM, DM, and SI-correction were 5.10±3.31, 7.48±4.04, and 4.13±2.51 mm, respectively. DM showed significant differences compared to the other correction methods. Conclusion: DM was subject to larger errors than BM. Our correction method improved positional errors.