Improved setup and positioning accuracy using a three-point customized cushion/mask/bite-block immobilization system for stereotactic reirradiation of head and neck cancer
| Autor: | Vinita Takiar, Xin A. Wang, Dershan Luo, He Wang, S. Tung, Gary Brandon Gunn, David I. Rosenthal, Clifton D. Fuller, James N Yang, Adam S. Garden, Andrew Wilson Dimmitt, Congjun Wang, Jennifer Wong, Jack Phan, Mark A. Edson, Pei Fong Wong |
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| Rok vydání: | 2016 |
| Předmět: |
medicine.medical_treatment
Planning target volume Radiotherapy Setup Errors Radiosurgery Patient Positioning Re-Irradiation 030218 nuclear medicine & medical imaging ExacTrac Immobilization 03 medical and health sciences Imaging Three-Dimensional 0302 clinical medicine Radiation Oncology Physics Humans Medicine PTV margin Radiology Nuclear Medicine and imaging Point (geometry) Head and neck Instrumentation Radiation business.industry Pitch direction Radiotherapy Planning Computer-Assisted Head and neck cancer Radiotherapy Dosage Ptv margin medicine.disease Head and Neck Neoplasms 030220 oncology & carcinogenesis head and neck cancer stereotactic radiotherapy Radiotherapy Intensity-Modulated Bite block business Nuclear medicine Radiotherapy Image-Guided |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| Popis: | The purpose of this study was to investigate the setup and positioning uncertainty of a custom cushion/mask/bite‐block (CMB) immobilization system and determine PTV margin for image‐guided head and neck stereotactic ablative radiotherapy (HN‐SABR). We analyzed 105 treatment sessions among 21 patients treated with HN‐SABR for recurrent head and neck cancers using a custom CMB immobilization system. Initial patient setup was performed using the ExacTrac infrared (IR) tracking system and initial setup errors were based on comparison of ExacTrac IR tracking system to corrected online ExacTrac X‐rays images registered to treatment plans. Residual setup errors were determined using repeat verification X‐ray. The online ExacTrac corrections were compared to cone‐beam CT (CBCT) before treatment to assess agreement. Intrafractional positioning errors were determined using prebeam X‐rays. The systematic and random errors were analyzed. The initial translational setup errors were −0.8±1.3 mm, −0.8±1.6 mm, and 0.3±1.9 mm in AP, CC, and LR directions, respectively, with a three‐dimensional (3D) vector of 2.7±1.4 mm. The initial rotational errors were up to 2.4° if 6D couch is not available. CBCT agreed with ExacTrac X‐ray images to within 2 mm and 2.5°. The intrafractional uncertainties were 0.1±0.6 mm, 0.1±0.6 mm, and 0.2±0.5 mm in AP, CC, and LR directions, respectively, and 0.0∘±0.5°, 0.0∘±0.6°, and −0.1∘±0.4∘ in yaw, roll, and pitch direction, respectively. The translational vector was 0.9±0.6 mm. The calculated PTV margins mPTV(90,95) were within 1.6 mm when using image guidance for online setup correction. The use of image guidance for online setup correction, in combination with our customized CMB device, highly restricted target motion during treatments and provided robust immobilization to ensure minimum dose of 95% to target volume with 2.0 mm PTV margin for HN‐SABR. PACS number(s): 87.55.ne |
| Databáze: | OpenAIRE |
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