Premium
Performance characterization of an integrated cone‐beam CT system for dedicated gamma radiosurgery
Author(s) -
Sarfehnia Arman,
Ruschin Mark,
Chugh Brige,
Yeboah Collins,
Becker Nathan,
Cho YoungBin,
Lee Young
Publication year - 2018
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1002/mp.13073
Subject(s) - radiosurgery , scanner , computer science , image quality , image guided radiation therapy , cone beam ct , tilt (camera) , medical physics , computer vision , nuclear medicine , medical imaging , artificial intelligence , physics , medicine , radiation therapy , computed tomography , image (mathematics) , engineering , radiology , mechanical engineering
Purpose This work describes the performance characterization of a cone‐beam CT ‐guided radiosurgery device, the Gamma Knife ® Icon™. Methods The performance tests have been categorized into: (a) image quality and mechanical integrity; (b) image coregistration fidelity; (c) adaptive treatment delivery quality; (d) high definition motion management performance characterization; (e) software communication performance testing of the integrated cone‐beam CT ( CBCT ) system. Results All image quality performance characterization satisfied or exceeded manufacturer specifications. The image quality and mechanical stability of the CBCT system over a 3‐month period was within tolerance with negligible (<0.1°) detector tilt angle. The CBCT definition of the stereotactic space had a measured average discrepancy of 0.15–0.16 mm in x, y, and z directions. On average, the high definition motion management system performance was within 0.05 mm with a residual offset of 0.15 mm when large displacements in a given direction were taken. The adaptive treatment delivery component as measured with CBCT coregistration of daily setups against reference setup images was accurate to within 0.2°. Comprehensive end‐to‐end testing showed a total uncertainty of better than 0.2 mm in positioning and 0.4% in dosimetry for treatment of centrally located lesions. Conclusions A set of system performance characterization tests spanning all aspects of the Gamma Knife Icon are presented. Overall, the system performance was in line with manufacturer specifications.