Hospital Trolley Ultrasound Scanner Equipment 125 * 40 * 76cm
Stable Performance
1. Multi-gate Doppler and 3D Spectrum Display
Introduction
Multi-gate Doppler is a patented Saset technology that
offers visualization of the velocity profile in the
velocity/depth plane and of the 3D spectrum with the
additional axis of axial depth.
The result offers never-before-seen information
regarding the hemodynamics of vessels, and
significantly improves the accuracy of volume flow
estimation.
Method
The method subdivides the axial gate into multiple
smaller sub-gates. Spectrum is computed for each subgate,
and the resulting velocity distribution may be
plotted in the velocity/axial distance axis as a velocity
profile. Additionally, the full 3D data, consisting of
velocity, time, and depth axes, is displayed.
As an example of the clinical significance, the central
collapse of the velocity profile after systole is related to
the elasticity of the vessel wall.
Improved volume flow estimation
The Doppler gate is widened to the entirety of the
vessel. By assuming radial symmetry, the volume flow
can be estimated from the numerous sub-gates.
This is an improvement over conventional single-gate
Doppler which assumes the velocity distribution is
laminar over the entirety of the gate, which is clearly
false.
We verify the increase in accuracy by flow phantom
experiments, using both conventional and multi-gate
Doppler to estimate volume flow.
2. Elasticity Imaging in Healthcare
Introduction
Tissue elasticity offers clinically significant information on
tumor and lesion growth, including early state characterization
that may greatly assist early diagnosis. We present
visualization of tissue elasticity through two methods:
1) Freehand elastography using manual probe compression
2) Sound-Push© elastography & shear wave speed
estimation using ARFI
Freehand elastography
Motion tracking of manual compression or breathing
induced movement generates a strain image
representing the elasticity of the underlying tissue. Saset
has one issued patent and our lab in collaboration with
Sichuan University has 17 published academic papers
and 7 PhD theses.
Wave Speed estimation
Saset introduces Sound-Push© elastography, with two pending
patents, which does not require manual compression as it is
based on transmitting high energy pulses to acoustically push
the tissue. This technique results in more accurate strain
images. Moreover, Saset offers shear wave speed estimation
which can diagnosis liver fibrosis diseases quantitatively.
Figure 4. ARFI image of the edema (the white spot in the
right picture) in early Achilles tendon injury
Experimental verification and accuracy analysis
In our lab, we have verified our Sound-Push© elastography using
Model 049, CIRS Elasticity QA phantom, with results between
1.25% and 4.44% error using four types of hard/soft lesions.
Additionally, we verified shear wave speed estimation using
Model 039, CIRS Shear Wave Liver Fibrosis Phantom, with
1.61% to 6.37% error (from 4 to 44.4 kPa Young’s modulus)
