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Natural Dose-Volume Histogram
4.0
5.0
dV/d(u)
×
10
6
u(D) = D
–3/2
Two-plane breast implant, SSDS optimized
Ref. Air Kerma = 0.3206 cGy.m
2
( cm
3
.cGy
3/2
)
Uniformity Index = 2.26
Quality Index = 3.40
The Natural Dose Volume Histogram (NDVH)
0.0
1.0
2.0
3.0
360
1000
380 400
500
600 700 800
Dose (cGy)
LD HD
PD
NPD
point source
Natural dose-volume histogram of an optimized two-plane breast implant. The
prescription dose PD is defined as 90% of the mean dose in the basal dose points, i.e.
90% of the peak dose value. The prescription dose PD coincides with the natural
prescription dose NPD which lies at the base of the peak at the Low Dose side.