Performance characterization of an integrated cone-beam CT system for dedicated gamma radiosurgery.
Med Phys
; 2018 Jun 29.
Article
em En
| MEDLINE
| ID: mdl-29959780
ABSTRACT
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.
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MEDLINE
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article