GE Precision 500D, Руководство оператора

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om 5184516-100 Rev. 5 6-29
18-2Size
This function allows you to measure the width of any place along the vessel, or a
length of balloon needed for a particular lesion.
1. You should be in On–Line Review or Review mode at the desired image, and
the system should be calibrated as given in the steps above.
2. The Stenosis feature buttons should be shown in the menu portion of the
screen. If not select the Stenosis option from the cursor selection pull down list.
3. If necessary, select the magnifying glass icon to zoom in on the image.
4. Select the Size button from the menu portion of the screen.
5. Use the pointing device to position the cursor at the edge of the vessel area
you want to measure.
6. Click and hold the left button on the pointing device.
7. Drag the cursor to the other side of the vessel (you can extend the line
beyond the vessel edge). As you move the cursor a line is shown on the
screen.
8. Release the pointing device button when the line shown on the screen spans
the width of the vessel. The Edge Detection Profile – Size menu will appear
over the image.
9. The size of the vessel, based on the calibration performed earlier, is given on
the image and in the menu window. If necessary, you can change the bound-
aries of the vessel by selecting either of the small squares on the vertical lines
shown in the graph. These lines represent the end points for the vessel area
based on the line drawn in step 7.
10. Select the OK button to close this window. The measurement value and line
will remain on the screen.
18-3Reference
This option allows you to quickly establish the size of a normal part of the vessel.
This value will be used as a reference for a normal vessel size when calculating
percent stenosis values.
1. You should be in On–Line Review or Review mode at the desired image, and
the system should be calibrated.
2. The Stenosis feature buttons should be shown in the menu portion of the
screen. If not select the Stenosis option from the cursor selection pull down
list. Select the Reference button from the menu portion of the screen.
3. Position the cursor at the edge of the vessel section you want to use as a ref-
erence measurement.
4. Click and hold the left button on the pointing device.
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