234 Chapter 16
Figure 16-1. Longitudinal outline of organ showing the start position for planimetry
This method was analyzed in a study by Littrup et al [1] of 20 in vitro models and
100 patients. They found it to be an accurate technique for measuring prostate
volume.
Different stepping units to control the spacing between the sections are available for
use with different transducers.
To use this method to calculate the volume of a particular organ, use the Planimetry
(Ellipse) or Planimetry (Freehand) measurements in the submenu for that organ
volume. The planimetry method is only available for the prostate and adenoma.
To make a planimetry calculation:
1
Record a B-mode image at one end of the organ.
2
Advance the transducer one step.
3
Freeze the image.
4
Click Planimetry (Ellipse) or Planimetry (Freehand) and draw an ellipse or
freehand drawing to outline the organ.
5
Repeat 2 through 4 until you have covered the entire organ.
The Volume is displayed (updated after each measurement is drawn) at the
bottom of the data area to the left of the image.
Reset
To reset the volume, press (long)
[
K
]
.
Empirical Method
The empirical method uses 2 orthogonal B-mode area outline measurements
•
transverse (T-area)
•
longitudinal (L-area)
to calculate volume. It is valid only for calculating bladder volume.
Содержание Pro Focus 2202
Страница 1: ...English BB1279 A June 2005 Pro Focus 2202 Extended User Guide ...
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Страница 48: ...48 Chapter 2 ...
Страница 49: ...Part 2 Working with the Image ...
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Страница 117: ...Part 3 Imaging Modes ...
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Страница 165: ...Part 4 Setting up and Maintaining Your System ...
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Страница 209: ...Part 5 Pro Packages ...
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