• Basic Procedures for ARFI Imaging
1. Select the proper probe and exam preset. Begin scanning in 2D to locate the desired region.
2. Press the configured key (such as F2) to enter the ARFI mode.
When ARFI is invoked, the system will display a B Mode image with the ARFI region of
interest (ROI) box superimposed and active.
Onscreen Help Bar will provide information on workflow.
3. Move the ROI with the trackball to the desired location
a) Avoid vessels, fluid filled structures, and ribs
b) Supine or shallow LPO patient position
c) Right hand elevated above the head improves intercostal access
d) No deep breaths or long breath holds. Shallow breathing is useful while telling patient to
suspend breathing mid breath.
e) Position ROI deeper than liver capsule, and preferably not deeper than approximately
8cm.
4. Press the Select Key to start acquisition.
5. The image will pause momentarily while the ARFI is fired and then return to live imaging.
6. A results box will appear on the screen with the ARFI data, ROI size, ROI position, and
Quality Factor in one of three forms as shown below:
a) If a site or segment was not selected before pressing Select to start ARFI, generic data
will be displayed.
i. Users can assign this data to a Site or Segment using the OLED controls
to be saved in the worksheet
ii. Users can store the image and data ‘as is’ onscreen without saving to the
worksheet.
b) If a liver segment was selected using the OLED controls before the Select key was
pressed, the results box will reflect the Segment
i. Users can delete the data point by clicking on the onscreen ‘x’
ii. Users can assign to a different segment
iii. Users can ‘Enter’ the data point in the worksheet by pressing the “Enter Data’
OLED.
Figure 8-2: ARFI with Liver Segment Selected
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