A feasibility study on reequipping multi-channel coils for simulation in head and neck radiotherapy(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第4期
- Page:
- 397-401
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- A feasibility study on reequipping multi-channel coils for simulation in head and neck radiotherapy
- Author(s):
- CHEN Xinyuan; YAN Xuena; ZHANG Kaixuan; CAO Ying; ZUO Lijing; DAI Jianrong
- National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
- Keywords:
- Keywords: head and neck; 16-channel flexible coil; radiotherapy; magnetic resonance imaging; parallel acquisition technique
- PACS:
- R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.04.001
- Abstract:
- Abstract: Objective To propose a scanning scheme based on reequipped two-piece 16-channel (16ch) flexible coils for the simulation in head and neck radiotherapy, and to evaluate its feasibility. Methods Two-piece 16ch flexible coils were reequipped with a wrap-around shape that matched the auxiliary positioning device in head and neck radiotherapy for sequence acquisition. The acceleration factors were set at 2 and 3. The image obtained in sequence acquisition using standard 6-channel (6ch) coils and the maximum support acceleration factor of 2 was used as the reference image for the comparison of image quality. Various indicators were quantitatively analyzed, including percentage of geometric distortion (%GD), slice position (SP), slice thickness (ST), percent image uniformity (PIU), ghosting ratio (GR), signal-to-noise ratio (SNR) and high-contrast spatial resolution (HCSR). Moreover, the scanning time was recorded when adopting different coils and acceleration factors. Results For ACR standard sequences T1WI and T2WI, PIU obtained using 16ch coils was 17.1% higher than that obtained using 6ch coils, and the differences in the other indicators were trivial. With the same acceleration factor (=2) and the same scanning parameters, SNR and PIU which were obtained using 16ch coils were higher than those obtained using 6ch coils, with an increase of about 21.9% and about 10.3%, respectively, and there were small differences in scanning time and other image indicators. Compared with those obtained using 6ch coils with an acceleration factor of 2, the scanning time obtained using 16ch coil with an acceleration factor of 3 for sequence acquisition was shortened by 24.4%, and PIU was increased by 8.56%, but SNR was decreased by 10.86%. Conclusion The reequipped multi-channel coils for radiotherapy simulation which can meet clinical requirements can significantly improve image SNR without increasing the scanning time and support the parallel acquisition technique while maintaining image quality, thereby greatly shortening scanning time.
Last Update: 2020-04-29