VDO MG 2100 Dokumentacja Strona 210

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210 VisualSonics Vevo 2100 Imaging System Operator Manual Rev 1.1
Chapter 34: Analyzing B-Mode images
Related information
Analyzing image data (page 156)
Protocol measurements (page 167)
Lens radius measurement
The lens radius measurement is only available in the Ophthalmology
measurement package for B-Mode images. Lens radius is measured in mm.
f To place a lens radius measurement:
1. Open an existing eye image or begin acquiring an eye ultrasound image and
then press
Scan/Freeze
.
2. Press
Measure
.
3. In the drop-down list of measurement packages select Ophthalmology.
4. In the list of measurements click Lens Radius.
5. Click on your image to place the initial caliper at one end of the radius.
6. Trackball along the contour of the lens to the center of your radius and then
click to place the center caliper.
7. Trackball to the end of the radius and click to place the caliper.
The system instantly transforms the angle rays to a curve. When you complete
the measurement the system stores it.
8. If you need to move the entire measurement, click on a measurement line and
then drag and drop it.
Creating pressure-volume loop measurements in B-Mode
Pressure-volume (PV) loop measurements provide a graphical method of
identifying and evaluating LV pressure-volume relationship changes related to
dynamic levels of cardiac stress.
You can generate PV loops from LV area measurements on both B-Mode and
M-Mode images that are accompanied by a continuous blood pressure trace.
These traces are typically acquired from a blood pressure catheter.
f To obtain PV loops from a B-Mode image:
1. Create a B-Mode cine loop of the heart in a long-axis orientation.
2. Complete a B-Mode LV Area measurement (page 205) that includes at least
two cardiac cycles.
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