Lymphedema: Imaging estimation of tissue elasticity

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Lymphedema: Imaging estimation of tissue elasticity

Postby patoco » Thu Dec 20, 2007 8:01 pm

Imaging and estimation of tissue elasticity by ultrasound.

Ultrasound Q. 2007 Dec

Garra BS.
John P. and Kathryn H. Tampas Green & Gold Professor of Radiology,
Department of Radiology, University of Vermont College of Medicine,
Fletcher Allen Health Care, Burlington, VT.

Ultrasound (US) elasticity imaging is an extension of the ancient art
of palpation and of earlier US methods for viewing tissue stiffness
such as echopalpation. Elasticity images consist of either an image of
strain in response to force or an image of estimated elastic modulus.
There are 3 main types of US elasticity imaging: elastography that
tracks tissue movement during compression to obtain an estimate of
strain, sonoelastography that uses color Doppler to generate an image
of tissue movement in response to external vibrations, and tracking of
shear wave propagation through tissue to obtain the elastic modulus.
Other modalities may be used for elasticity imaging, the most powerful
being magnetic resonance elastography. With 4 commercial US scanners
already offering elastography and more to follow, US-based methods may
be the most widely used for the near future.Elasticity imaging is
possible for nearly every tissue. Breast mass elastography has
potential for enhancing the specificity of US and mammography for
cancer detection. Lesions in the thyroid, prostate gland, pancreas,
and lymph nodes have been successfully imaged using elastography.
Evaluation of diffuse disease including cirrhosis and transplant
rejection is also possible using both imaging and nonimaging methods.
Vascular imaging including myocardium, blood vessel wall, plaque, and
venous thrombi has also shown great potential. Elasticity imaging may
also be important in assessing the progress of ablation therapy.
Recent work in assessing porous materials using elastography suggests
that the technique may be useful in monitoring the severity of
lymphedema. ... d_RVDocSum

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