236 Chapter 16
Volume Formulas
Table 16-5. Urology calculation formulas.
Variable Definitions
Table 16-6. Variables in urology calculation formulas.
PSA Density
Table 16-7. PSA Density formula.
Value
Formula
HWL
Volume = H x W x L x Factor
Planimetry
Empirical
Variable
Definition
HWL
Prostate HWL Factor
0.523
Adenoma HWL Factor 0.523
Testis HWL Factor
0.523
Kidney HWL Factor
0.523
Bladder HWL Factor
0.570
The factor for kidney, testis, prostate, and adenoma implies that the organs have a true
ellipsoid shape. For the bladder, the factor 0.57 is found to be more precise [4].
Planimetry
PA
Area of the recorded parallel section
Stepsize
Distance between parallel sections (default step size is 5mm)
i
Step number
Volume
1
3
---
PA i
( )
PA i 1
–
(
)
PA i
( )
PA i 1
–
(
)
⋅
+
+
(
)
Stepsize
⋅
i
2
=
N
∑
=
Volume
exp 0.8304 0.5635
min AL, AT
[
]
(
)
ln
⋅
0.7211
max AL, AT
[
]
(
)
ln
⋅
+
+
(
)
=
Value
Formula
PSAD
Density
PSA
Prostate Volume
----------------------------------------
PSA factor
⋅
=
Summary of Contents for Pro Focus 2202
Page 1: ...English BB1279 A June 2005 Pro Focus 2202 Extended User Guide ...
Page 14: ...14 ...
Page 15: ...Part 1 Basics ...
Page 16: ......
Page 32: ...32 Chapter 1 ...
Page 48: ...48 Chapter 2 ...
Page 49: ...Part 2 Working with the Image ...
Page 50: ......
Page 98: ...98 Chapter 5 ...
Page 117: ...Part 3 Imaging Modes ...
Page 118: ......
Page 136: ...136 Chapter 8 ...
Page 152: ...152 Chapter 10 ...
Page 164: ...164 Chapter 12 ...
Page 165: ...Part 4 Setting up and Maintaining Your System ...
Page 166: ......
Page 200: ...200 Chapter 13 ...
Page 208: ...208 Chapter 14 ...
Page 209: ...Part 5 Pro Packages ...
Page 210: ......
Page 288: ...288 Chapter 19 ...
Page 313: ...Part 6 Appendixes ...
Page 314: ......
Page 344: ...344 Appendix C ...