[Comparison of setup errors between two immobilization methods in prostate cancer radiotherapy based on cone-beam computed tomography].

Conventional carbon fiber human body fixator combined with thermoplastic film can significantly reduce the setup error. However, the carbon fiber whole-body fixator in the lithotomy position demonstrated larger setup errors in the <i>X</i>, <i>Y</i>, and <i>Z</i> directions compared with the conventional fixator combined with a thermoplastic mask, indicating the need for further workflow optimization. Given that the lithotomy position is essential for transperineal ultrasound-guided techniques, further research and improvements are required to achieve higher positioning accuracy.