597 / 1119
Surrogate for Organ Motion : Online – Offline
matching (Intrafraction)
Mean X
Lateral (mm)
Mean Y
ANT-POST
(mm)
Mean Z
SUP-INF (mm)
Day 5
5.3
7.9
6.4
Day 10
4.9
7.8
7.6
Day 15
4.7
8.8
7.2
Day 20
6.4
7.5
8.7
Day 25
4.7
7
9.6
Parameter
Error (in mm) measured along
X-Axis
(RT – LT )
Y-axis
(ANT-POST)
Z-axis
(SUP-INF)
SD of Random
error (σ)
4.3
5.8
6.6
SD of systematic
error (ξ)
2.2
2.6
3.4
TMH Study; ASTRO 2014
•
Daily CBCT IGRT
•
Nodal CTV matching
•
Mid RT Tumor Regression with MRI
•
Tumor regression: the mean cervical tumor
volume reduced from 58.4 cc at diagnosis to
28.3 cc) at mid treatment
•
Cervical cancer with intact Uterus
•
N = 40 patients with FIGO IIB-IIIB