scholarly journals Recommendations of megavoltage computed tomography settings for the implementation of adaptive radiotherapy on helical tomotherapy units

2020 ◽  
Vol 21 (5) ◽  
pp. 87-92
Author(s):  
Christian Velten ◽  
Robert Boyd ◽  
Kyoungkeun Jeong ◽  
Madhur K. Garg ◽  
Wolfgang A. Tomé
Keyword(s):  
Computed Tomography ◽  
Helical Tomotherapy ◽  
Adaptive Radiotherapy ◽  
Megavoltage Computed Tomography

scholarly journals Fast Megavoltage Computed Tomography: A Rapid Imaging Method for Total Body or Marrow Irradiation in Helical Tomotherapy

2016 ◽  
Vol 96 (3) ◽  
pp. 688-695 ◽  
Author(s):  
Taiki Magome ◽  
Akihiro Haga ◽  
Yutaka Takahashi ◽  
Keiichi Nakagawa ◽  
Kathryn E. Dusenbery ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Helical Tomotherapy ◽  
Imaging Method ◽  
Rapid Imaging ◽  
Megavoltage Computed Tomography ◽  
Total Body

Performance characterization of megavoltage computed tomography imaging on a helical tomotherapy unit

2005 ◽  
Vol 32 (8) ◽  
pp. 2673-2681 ◽  
Author(s):  
Sanford L. Meeks ◽  
Joseph F. Harmon ◽  
Katja M. Langen ◽  
Twyla R. Willoughby ◽  
Thomas H. Wagner ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Helical Tomotherapy ◽  
Computed Tomography Imaging ◽  
Performance Characterization ◽  
Tomography Imaging ◽  
Megavoltage Computed Tomography

scholarly journals Measurement and analysis of the imaging dose with megavoltage computed tomography for helical tomotherapy

2009 ◽  
Vol 28 (8) ◽  
pp. 886-889 ◽  
Author(s):  
Shou-Ping Xu ◽  
Chuan-Bin Xie ◽  
Zhong-Jian Ju ◽  
Xiang-Kun Dai ◽  
Han-Shun Gong ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Helical Tomotherapy ◽  
Measurement And Analysis ◽  
Megavoltage Computed Tomography ◽  
Imaging Dose

scholarly journals The ratio of weight loss to planning target volume significantly impacts setup errors in nasopharyngeal cancer patients undergoing helical tomotherapy with daily megavoltage computed tomography

2016 ◽  
Vol 50 (4) ◽  
pp. 427-432 ◽  
Author(s):  
Wei-Hsien Hou ◽  
Chun-Wei Wang ◽  
Chiao-Ling Tsai ◽  
Feng-Ming Hsu ◽  
Jason Chia-Hsien Cheng
Keyword(s):  
Computed Tomography ◽  
Weight Loss ◽  
Planning Target Volume ◽  
Helical Tomotherapy ◽  
Small Body ◽  
Nasopharyngeal Cancer ◽  
Target Volume ◽  
Body Frame ◽  
Setup Errors ◽  
Megavoltage Computed Tomography

Abstract Background Changes in head and neck anatomy during radiation therapy (RT) produce setup uncertainties of nasopharyngeal cancer (NPC) irradiation. We retrospectively analyzed image guidance data to identify clinical predictors of setup errors. Patients and methods The data of 217 NPC patients undergoing definitive RT on a helical tomotherapy (HT) unit were analyzed. Factors including tumor stage, body mass index, weight loss, and planning target volume (PTV) were assessed as predictors of daily megavoltage computed tomography (MVCT) setup displacements, which were automatically registered using software. Results Mean daily setup displacements (in mm) were 1.2 ± 0.6, 1.8 ± 0.8, 3.4 ± 1.4 in the medial-lateral (ML), superior-inferior (SI), and anterior-posterior (AP) directions, respectively. Mean weight loss was 4.6 ± 3.3 kg (6.8 ± 4.9%). Patients with weight loss > 5% had significantly larger setup displacements in the AP (3.6 ± 1.5 vs. 2.9 ± 1.1 mm, p < 0.001) and SI (1.6 ± 0.7 vs. 1.9 ± 0.9 mm, p = 0.01) direction, but not in the ML direction (p = 0.279). The AP setup error increased 0.06 mm (y = 0.055x + 2.927, x: percentage of weight loss/PTV, y: AP displacement) per one percent increase in weight loss normalized to PTV. Conclusions Patients with weight loss > 5% and smaller PTVs, possibly because of small body frame or neck girth, were more likely to have increased setup errors in the AP direction.

Sign in / Sign up

Export Citation Format

Share Document