L-R

 

 

 

A-P

 

 

 

1st five IGRT

2nd five IGRT

3rd five IGRT

Unshifted

1st five IGRT

2nd five IGRT

3rd five IGRT

Unshifted

Mean (mm)

1.1

0.67

0.48

1.5

0.5

0.1

0.13

1.2

SD (mm)

3.8

3.8

3.6

4.1

6.1

4.6

3.9

6.5
Table 3: Comparison of isoshifts in the L-R and A-P directions in the three successive ‘groups of five’ IGRT fractions.