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Shear wave propagation maps obtained using transient elastography VCTE technique in a normal liver (top) and a cirrhotic liver (bottom). The liver stiffness is significantly higher in the cirrhotic liver. Transient elastography was initially called time-resolved pulse elastography [15] when it was introduced in the late 1990s. The technique ...
Tomoelastography of the abdomen; upper a healthy state, lower with malignancy.. Tomoelastography (from ancient Greek τόμος tomos, “slice” and elastography – imaging of viscoelastic properties) is a medical imaging technique that provides quantitative maps of the mechanical properties of biological soft tissues with high spatial resolution (called elastograms).
MR elastography for detection of liver fibrosis in two patients. The left column shows the anatomy, with the liver outlined. The middle row shows images of propagating shear waves in the liver, captured with the MRE technique. The right column shows elastograms computed from the wave images, with tissue stiffness depicted with on color scale.
Magnetic resonance elastography (MRE) is a method for studying the properties of biological materials in living organisms by propagating shear waves at desired frequencies throughout the desired organic tissue. [10] This method uses a vibrator to send the shear waves into the tissue and magnetic resonance imaging to view the response in the ...
Other modalities have been introduced which are incorporated into ultrasonagraphy systems. These include 2-dimensional shear wave elastography and point shear wave elastography which uses acoustic radiation force impulse imaging. [16] Rarely are diseases of the bile ducts, such as primary sclerosing cholangitis, causes of cirrhosis. [45]
The current imaging protocol for a hepatogram is magnetic resonance elastography for fibrosis and inflammation assessment, and proton density fat fraction for steatosis measurement. A hepatogram is seen as a more accurate and noninvasive alternative to liver biopsy, and has emerged as "the reference standard for non-invasive diagnosis of liver ...
In linear elasticity, the P-wave modulus, also known as the longitudinal modulus, or the constrained modulus, is one of the elastic moduli available to describe isotropic homogeneous materials. It is defined as the ratio of axial stress to axial strain in a uniaxial strain state.
Elastography has been proven feasible for characterization of ocular tissues. [ 11 ] Tissue exhibits varying degrees of viscoelasticity (time-dependent response to a load), poroelasticity (presence of fluid-filled pores or channels), and anisotropy, as well as a nonlinear relationship between elasticity and the applied load.