RT Journal Article
SR Electronic
T1 A Relationship Between Cervical Vertebrae Twisting and Cranial Angle in Head and Neck Radiotherapy
JF In Vivo
JO In Vivo
FD International Institute of Anticancer Research
SP 2401
OP 2406
DO 10.21873/invivo.12053
VO 34
IS 5
A1 TAKAHIRO AOYAMA
A1 HIDETOSHI SHIMIZU
A1 KOJI SASAKI
A1 MIO ANDO
A1 NAOKI KANEDA
A1 HIROYUKI TACHIBANA
A1 KOJIRO SUZUKI
A1 TAKESHI KODAIRA
YR 2020
UL http://iv.iiarjournals.org/content/34/5/2401.abstract
AB Background/Aim: Because current image-guided radiotherapy systems can only correct six axes, it is impossible to correct the twisting of cervical vertebrae. The purpose of this study was to clarify the relationship between cervical vertebrae twisting and cranial angle. Materials and Methods: Nineteen patients who underwent intensity-modulated radiation therapy were retrospectively reviewed. Twisting of cervical vertebrae was analysed using planning computed tomography (CT) and megavoltage CT images for image-guided radiotherapy. Results: Although the cranial angle during planning CT was not strongly correlated with twisting (correlation coefficient <0.7), when the patients were divided into two groups by cranial angle, the twisting of the small-angle group was significantly reduced. Specifically, cranial angles of <25° significantly and efficiently reduced the twisting of the upper cervical vertebra compared with those of the other groups. Conclusion: Twisting of the upper cervical vertebrae is reduced by using a cranial angle of <25° during planning CT.