Measurement and Analysis
304 Vivid S5/Vivid S6 User Manual
R2424458-100 Rev. 2
Figure 7-34: IMT measurement (Posterior wall)
IMT Measurement Protocol
The IMT measurement is based on the placement of an ROI
(region of interest) tool to define an area of the vessel where
the IMT will automatically be measured.
There are two methods to position the IMT ROI:
• Arbitrary: Place the ROI at an arbitrary location selected by
the user. The ROI length is also arbitrarily defined by the
user.
• Protocol defined: Place an ROI with predefined length at
a predefined distance (offset) from some vertical marker.
Both ROI offset and length are predefined by the user
according to the user's protocol.
At any time, the users may select if they wish to measure IMT
by the protocol or by the arbitrary method.
IMT Measurement procedure
The following procedure describes the posterior IMT
measurement.
1. Acquire a longitudinal scan of the carotid artery and
optimize the image.
1. Vessel lumen
2. Vessel wall
3. Lumen-Intima boundary
4. Media-Adventitia boundary
5. Multiple IMT measurements
To Next Page
Loading...
