2304-2305 / 3107
Basic Dose Calculation Principles
DD(d)
%
=D
max
• (
f
+d
m
/
f
+d)
2
•e
-(
µ
• d)
•K
s
DD is dependent on f=SSD, so data (tables) required for all SSD’s
= not practical for isocentric techniques
Different approaches for omitting the distance effect
for manual dose calculations
–
TAR - tissue air ratio
–
TMR – tissue maximum ratio
–
TPR – tissue phantom ratio