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Elastography

Elastography

View anatomy differently with Elastography imaging from Sonix.

Elastography imaging is paving the way toward better diagnosis of tumors and lesions, with encouraging advances in breast imaging, prostate imaging, and endocrinology. This is an optional module available on any Sonix system with a specific set of transducers*.

Clinical Application of Elastography

Many diseases cause changes in the mechanical properties of tissues. These changes cannot be directly imaged by current medical imaging devices such as computed tomography (CT), traditional ultrasound (US), and magnetic resonance imaging (MRI). Elastography as a new imaging technique has been well established in the literature as a promising technology to identify tissue stiffness. To acquire elastography images, the ultrasound technician applies slight compression to the tissue while the system acquires regular ultrasound images. The system then processes these images, generates the corresponding strain images, and displays them in real time beside conventional ultrasound images. Normal tissue and benign tumors are typically elastic or soft and will deform easily, whereas malignant tumors are typically stiffer and do not deform as much.

Technical Background

In real-time elastography, RF frames are acquired continuously and strain images (also known as elastograms) are generated in real time by estimating the strain between sequential frames. Fast algorithms are key to enabling this kind of imaging. Relative strains between frames are typically very small, therefore the sensitivity of the algorithms is very important.

 

 

Compression

Shearwave

Output

Relative Stiffness

Absolute Stiffness

Frame rate

Up to 30 FPS

Up to 2 FPS

Energy in patient

Low/Negligible

High-frame rate slowed

 

Freehand Elastography Imaging Offers Real-Time Feedback of Tissue Stiffness

The Sonix Elastography module uses fast and sensitive algorithms to generate images showing tissue stiffness by measuring strain distributions in tissues in response to external compression. Strain ratio measurements are used to quantify the relative stiffness between the lesion and surrounding tissue.

Custom Thresholds

Color threshold control will help isolate tissue structures. This is done by confining the color map as seen on the vertical bar above.

2D Color Maps

Another quality assurance feature, this mode will overlay (absent) areas in the raw ultrasound image to the elastography image. This will provide you more information to locally confirm your results.

Custom Color Maps

To help visualize areas of interest, the color map can be customized to various configurations.

Get the Best Image with the Elastography Quality Feedback Indicator from Sonix

To help the operator acquire the best possible image, Sonix has designed a real-time feedback indicator that tells the operator when the correct amount of compression or relaxation is being applied to the area being scanned. The system displays more or less green as the operator applies pressure during scanning.

*Elastography is not supported on the PA7-4/12 and SA4-2/24 Phased Array Transducers.