Vascular 7-5
2. Perform the measurement referring to methods in table above.
7.4.2 Calculation Tool Operations
Stenosis D
Function: Measures Normal Diam and Resid Diam, calculates Stenosis D.
1. Select [Stenosis D] in the measurement menu.
2. Use the method of Distance measurement of 2D General Measurements to measure
Normal(D) and Resid(D).
Stenosis D is calculated automatically.
Stenosis A
Function: Measures Normal Area and Resid Area, calculates Stenosis A.
1. Select [Stenosis A] in the measurement menu.
2. Use the method of Area measurement of 2D General Measurements to measure Normal(A)
and Resid(A).
Stenosis A is calculated automatically.
ICA/CCA (PS)
Function: measures the flow velocity ratio between ICA and CCA to calculate the stenosis.
1. Select [ICA/CCA] in the measure menu.
2. Measure PS value of ICA and CCA using 2 PT method in D trace, and the system calculates
the stenosis. Where, ICA value can be measured in proximal, middle and distal end where
CCA adopts the distal PS value by default.
7.4.3 Study Tool Operations
IMT
NOTE: 1. The IMT function is unavailable on the product not configured with IMT.
2. IMT measurement is available on frozen (or history) linear array image only.
Function: IMT (Intima-Media Thickness) measures the distance between LI (Lumen-Intima) and
MA (Media-Adventia).
The IMT values at 4 positions: CCA (common Carotid Artery), ICA (Internal Carotid Artery), ECA
(External Carotid Artery) and Bulb (Bulbillate) need to be measured here.
1. Enter IMT exam mode, scan and freeze the image (or review a history image).
2. Select [IMT] in the measurement menu and enters the IMT measurement.
3. Select the side (Left/ Right), angle and vessel wall (Near/ Far).
4. Select an item such as [ICC IMT], the ROI box displays on screen.
It appears as
when Near is selected;
It appears as when Far is selected;
Tips Make sure that you select the right vessel wall (Near/ Far) before IMT
measurement; otherwise the intima may be recognized incorrectly due to different
algorithm that applied in near/ far wall recognition.
5. Move ROI box to the desired position, press <Set>. Two auto trace lines appear in the box.
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