Modern Bt Techniques - Florence 2016

Planned dose vs averaged over 3 scans

Planning CT

Average

Mean difference p

V100 (%) V100 (cc) D90 (cGy)

95.5 [94.1-96.9] 32.4 [28.6-36.1]

94.2 [93.0-95.3] 31.8 [28.3-35.4]

-1.2 [-1.9:-0.6] -0.5 [-0.9:-0.1]

NA

0.02 0.00

132.1 [129.6:134.7] 128.9 [126.8:130.9] -3.3 [-4.8:-1.8]

PTV remains constant V100 and D90 lower on follow-up scans No large decrease in V100

A. Dinkla. Radiother Oncol 2013;107: 106-111