745 / 1578
Recommendation for reporting
•
Dose homogeneity:
Ø
Characteristically low in SRS/SBRT
Ø
Suggested to report the
Mean Dose to the PTV and its standard
deviation
•
Conformity:
Ø
Characterizes to which degree the high dose region conforms to the
target volume
.
Ø
Paddick Conformity Index:
Ø
The inverse PCI is recommended:
•
Gradient Index:
(“dose fall off”)
SBRT 2017 - D. Verellen
TV
PIV
PIV
×
TV
PIV
TV
TV
×
PIV
TV
PIV
2
PIV
half
PIV
Healthy tissue receiving dose > PIV
Quality of target coverage
TV
PIV:
Target Volume (TV) within
Prescription Isodose Volume (PIV)
Clearly define GTV or PTV!