Imaging the Mechanical Properties of Soft Tissue/L'imagerie des caractéristiques mécaniques des tissus mous.

弹性成像是一种相对较新的成像软组织内弹性特性分布的技术。弹性成像提供了可视化弹性对比度的能力，乳腺癌的弹性对比度比X射线对比度大10-100倍，以及组织衰减等复杂属性，能够唯一地诊断肝纤维化。由于没有直接成像内部弹性值的方法，弹性成像依赖于三步法：首先，对组织施加机械驱动(例如振动)，产生依赖于内部弹性结构的应变场；其次，使用数字、超声或磁共振成像等方法来捕捉该应变模式；最后，通过数学反问题从测量的应变场重建弹性特性图像。

Elastography is a relatively new technology for imaging the elastic property distribution within soft tissues. Elastography offers the ability to visualize elastic contrast, 10-100X greater than x-ray contrast for breast cancer, as well complex properties such as tissue attenuation, uniquely able to diagnose liver fibrosis. As no direct method for imaging internal elasticity values exists, elastography relies on a three step approach: first, mechanical actuation (e.g. vibration) is applied to the tissue, generating a strain field that is dependent upon the internal elastic structure; second, methods such as digital, ultrasound or magnetic resonance imaging are used to capture this strain pattern; finally, the elastic property image is reconstructed from the measured strain field by means of a mathematical inverse problem.