Precision of image-guided spinal stereotactic ablative radiotherapy and impact of positioning variables.

ABSTRACT:

Background and purpose

Spinal stereotactic ablative body radiotherapy (SABR) requires high precision. We evaluate the intrafraction motion during cone-beam computed tomography (CBCT) guided SABR with different immobilization techniques.

Material and methods

Fifty-seven consecutive patients were treated for 62 spinal lesions with SABR with positioning corrected in six degrees of freedom. A surface monitoring system was used for patient set up and to ensure patient immobilization in 65% of patients. Intrafractional motion was defined as the difference between the last CBCT before the start of treatment and the first CT afterwards.

Results

For all 194 fractions, the mean intrafractional motion was 0.1 cm (0-1.1 cm) in vertical direction, 0.1 cm (0-1.1 cm) in longitudinal

SUBMITTER: Billiet C 

PROVIDER: S-EPMC9172170 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature