Evaluation of kidney motion and target localization in abdominal SBRT patients.

Evaluation of kidney motion and target localization in abdominal SBRT patients. J Appl Clin Med Phys. 2016 Nov 08;17(6):6406 Authors: Sonier M, Chu W, Lalani N, Erler D, Cheung P, Korol R Abstract The purpose of this study was to evaluate bilateral kidney and target translational/rotational intrafraction motion during stereotactic body radiation therapy treatment delivery of primary renal cell carcinoma and oligometastatic adrenal lesions for patients immobilized in the Elekta BodyFIX system. Bilateral kidney motion was assessed at midplane for 30 patients immobilized in a full-body dual-vacuum-cushion system with two patients immobilized via abdominal compression. Intrafraction motion was assessed for 15 patients using kilovoltage cone-beam computed tomography (kV-CBCT) datasets (n = 151) correlated to the planning CT. Patient positioning was corrected for translational and rotational misalign-ments using a robotic couch in six degrees of freedom if setup errors exceeded 1mm and 1°. Absolute bilateral kidney motion between inhale and exhale 4D CT imaging phases for left-right (LR), superior-inferior (SI), and anterior-posterior (AP) directions was 1.51 ± 1.00 mm, 8.10 ± 4.33 mm, and 3.08 ± 2.11 mm, respec-tively. Residual setup error determined across CBCT type (pretreatment, intrafrac-tion, and post-treatment) for x (LR), y (SI), and z (AP) translations was 0.63 ± 0.74 mm, 1.08± 1.38 mm, and 0.70 ± 1.00 mm; while for x (pitc...
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research