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| Effects of X-ray volume imaging registration methods on position verification for radiotherapy in treatment of middle/lower-segment esophageal cancer |
| LIU Haojia1, WANG Huitao2, XU Hongwei1, ZHENG Anping2, SUN Xiaodong2, ZHU Jinfeng2 |
1. The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou 450000 China;
2. Anyang Tumor Hospital, Anyang 455000 China |
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Abstract Objective To compare the set up errors derived from different registration methods of the X-ray volume imaging (XVI) system for radiotherapy in the treatment of middle/lower-segment esophageal cancer, and to provide a reference for radiation treatment of esophageal cancer. Methods We randomly selected 63 patients with middle/lower-segment esophageal cancer, and obtained their reconstructed XVI images at the first therapy to perform automatic registration with gray-value and bone registration methods. We acquired and compared the three translation errors (along x [left to right], y [head to feet], and z [front to back] axes) and three rotation errors (around the x, y, and z axes) derived from the two registration methods. Results Gray-value registration had significantly smaller translation errors along the x and z axes than bone registration (x azes t = −2.78, z azes t = −2.15, P < 0.05), but there was no significant difference along the y axes (P > 0.05). The rotation errors around the three axes were all smaller than 1°, and were smaller with gray-value registration than with bone registration, but without significant differences (P > 0.05). Conclusion We recommend gray-value registration for radiotherapy in the treatment of middle/lower-segment esophageal cancer. Manual verification or fine-tuning is recommended after automatic registration in clinical practice. Besides translation errors, rotation errors should also be paid attention to.
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Received: 09 March 2022
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