10 Virtual Touch Applications
Instructions for Use 10 - 15
Virtual Touch IQ
Caution: Using the appropriate amount of scanning pressure is an important factor in achieving
reliable and repeatable results with Virtual Touch IQ. Minimal to mild compression is
recommended for best results. Excessive pressure on the body with the transducer may
artificially elevate shear wave velocities and result in unreliable measurements.
Caution: In breast applications of Virtual Touch IQ, shear wave imaging may have limitations in
adequately visualizing regions of very high stiffness, for example, in certain breast cancers.
Siemens recommends using the Quality image display setting to verify that the shear wave
velocity and elasticity image represents adequate shear wave formation. Shear wave velocity
and elasticity measurements should be made only in regions with high shear wave quality,
represented in green when the Quality image display setting is selected.
Caution: In lesions where multiple or extensive areas of low shear wave quality are
encountered, shear wave velocity and elasticity estimates in the lesion should be interpreted
with caution.
Note: Measurement values for shear wave velocity, elasticity, and other image display settings are
relative indexes intended only for the purpose of comparison with other measurements performed
using the ACUSON S2000 ultrasound system and the ACUSON S3000 ultrasound system. Absolute
values for shear wave velocity and elasticity measurements may vary among different manufacturers
due to multiple system-dependent factors, including shear wave frequency, excitation beam (push
beam) frequency, shear wave detection techniques, and shear wave velocity and elasticity estimation
methods. The system displays the following message on the screen during Virtual Touch IQ imaging
and in the report if measurements are saved to the report: "Shear wave speed and elasticity values
may vary among manufacturers!"
Virtual Touch IQ quantitatively depicts tissue stiffness for a selected region of interest and
provides a quantitative measurement of shear wave velocity (Vs) or elasticity (E) for any point
within the region of interest. You can adjust the size and depth of the region of interest (ROI)
where shear wave information will be acquired. The maximum depth for the ROI is 6 cm, the
effective limit to acquire shear wave images in the intended applications under normal scanning
conditions.
In a full-screen format, the system displays the shear velocity or elasticity data as a
transparent color overlay on the 2D image.
In a dual-screen format, the system displays the 2D image on the left side and the ROI with
the shear velocity or elasticity data on the right side.
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