title: Improved setup and positioning accuracy using a three-point customized cushion/mask/bite-block immobilization system for stereotactic reirradiation of head and neck cancer.
abstract: 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.
authors.affiliation: The University of Texas MD Anderson Cancer Center. hewang@mdanderson.org.
authors.forename: He
authors.initials: H
authors.lastname: Wang
authors.forename: Congjun
authors.initials: C
authors.lastname: Wang
authors.forename: Samuel
authors.initials: S
authors.lastname: Tung
authors.forename: Andrew Wilson
authors.initials: AW
authors.lastname: Dimmitt
authors.forename: Pei Fong
authors.initials: PF
authors.lastname: Wong
authors.forename: Mark A
authors.initials: MA
authors.lastname: Edson
authors.forename: Adam S
authors.initials: AS
authors.lastname: Garden
authors.forename: David I
authors.initials: DI
authors.lastname: Rosenthal
authors.forename: Clifton D
authors.initials: CD
authors.lastname: Fuller
authors.forename: Gary B
authors.initials: GB
authors.lastname: Gunn
authors.forename: Vinita
authors.initials: V
authors.lastname: Takiar
authors.forename: Xin A
authors.initials: XA
authors.lastname: Wang
authors.forename: Dershan
authors.initials: D
authors.lastname: Luo
authors.forename: James N
authors.initials: JN
authors.lastname: Yang
authors.forename: Jennifer
authors.initials: J
authors.lastname: Wong
authors.forename: Jack
authors.initials: J
authors.lastname: Phan
mesh_terms: D006258:Head and Neck Neoplasms / Q000601:surgery*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D007103:Immobilization; D056888:Patient Positioning; D016634:Radiosurgery; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D061106:Radiotherapy Setup Errors / Q000517:prevention & control*; D061089:Radiotherapy, Image-Guided; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods; D000069475:Re-Irradiation