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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
⋅
=
Содержание Pro Focus 2202
Страница 1: ...English BB1279 A June 2005 Pro Focus 2202 Extended User Guide ...
Страница 14: ...14 ...
Страница 15: ...Part 1 Basics ...
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Страница 32: ...32 Chapter 1 ...
Страница 48: ...48 Chapter 2 ...
Страница 49: ...Part 2 Working with the Image ...
Страница 50: ......
Страница 98: ...98 Chapter 5 ...
Страница 117: ...Part 3 Imaging Modes ...
Страница 118: ......
Страница 136: ...136 Chapter 8 ...
Страница 152: ...152 Chapter 10 ...
Страница 164: ...164 Chapter 12 ...
Страница 165: ...Part 4 Setting up and Maintaining Your System ...
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Страница 200: ...200 Chapter 13 ...
Страница 208: ...208 Chapter 14 ...
Страница 209: ...Part 5 Pro Packages ...
Страница 210: ......
Страница 288: ...288 Chapter 19 ...
Страница 313: ...Part 6 Appendixes ...
Страница 314: ......
Страница 344: ...344 Appendix C ...