ESTRO 2022 - Abstract Book

S268

Abstract book

ESTRO 2022

3) 68 patients (394 fractions) positioned on device A[2] with SGRT1[1] 4) 55 patients (346 fractions) positioned on device B[4] 4 with SGRT[1]

All feet and knees were indexed to the couch or base plate by cushions. For 301 patients (4213 fractions) 3D vectors were calculated and the residual translations after imaging were analyzed for all groups. ANOVA was performed with p 0,05.

[1] SGRT system is Vision RT, Align RT, London, UK [2] Device A is ThoraxSupport from Macromedics [3] SGRT system is C-RAD, Catalyst HD+, Upsala, Sweden [4] Device B is SBRT plate ™from Orfit

Results The average magnitude of the translations for group 1 were -0,23 (±0,46) cm; -0,11 (±0,55) cm; -0,02 (±0,66) cm; 0,71 (±0,49) , group 2 -0,22 (±0,33) cm ;-0,04 (±0,39) cm; -0,04 (±0,23) cm; 0,57 (±0,32) , group 3 -0,24 (±0,37) cm, -0,02 (±0,67) cm, -0,01 (±0,22) cm, 0,60 (±0,58) and group 4 were -0,22 (±0,37) cm; 0,01(±0,56) cm and 0,00 (±0,31) cm, 0,5 (±0,27) for vertical, longitudinal, lateral online matched values and 3D error respectively. All F values were > F critical threshold and all the p values were below the 0,05 threshold except between group 2&3 (for all residual translational error and calculated 3D values).