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首页> 外文会议>NATO Advanced Study Institute on Optimising Detectors, Imaging and Computing Technologies from Nuclear Physics in General and Securily Applications; 2005 1027-1108; Archamps(FR) >ULTRASONIC ELASTOGRAPHY
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ULTRASONIC ELASTOGRAPHY

机译：超声弹性成像

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摘要

Elastography is a new ultrasound-based imaging technique that provides images (called elastograms) of internal strain in soft tissues under a static compression. The strain is related to the stiffness of the tissues, which is in turn related to the pathological state of tissues. For example, it has been known for long that breast and prostate cancer are stiffer than normal tissues, and palpation is a standard medical practice. Elastography is able to provide new quantitative information about the stiffness of the tissues that would not be obtainable with existing imaging modalities. Elastograms are created by digitizing ultrasonic signals before and after applying a small static compression (usually about 1%) to the tissues being scanned. For small compressions, the displacement and the compression of the tissues induce a displacement and a temporal compression of the ultrasonic signal. These displacements are tracked by locating the position of the maximum of the cross-correlation function between the pre- and post-compression signals. Strain is obtained by taking the gradient of the displacements, and a strain image is formed. Applications include breast, prostate, kidney and intravascular elastography, as well as thermal therapy follow-up. Although elastography is still only used in research today, it is expected that this imaging modality may become available for standard practice within a few years.
机译：弹性成像是一种新的基于超声的成像技术，可在静态压缩下提供软组织中内部应变的图像（称为弹性图）。应变与组织的刚度有关，而硬度又与组织的病理状态有关。例如，长期已知乳腺癌和前列腺癌比正常组织硬，触诊是标准的医学实践。弹性成像能够提供有关组织刚度的新定量信息，而现有的成像方式无法获得这些信息。通过对要扫描的组织进行小的静态压缩（通常约为1％）之前和之后对超声信号进行数字化来生成弹性图。对于小的压缩，组织的位移和压缩引起超声信号的位移和时间压缩。通过在压缩前和压缩后信号之间找到互相关函数最大值的位置来跟踪这些位移。通过获取位移的梯度获得应变，并形成应变图像。应用包括乳房，前列腺，肾脏和血管内弹性成像，以及热疗随访。尽管弹性成像技术仍仅在当今的研究中使用，但预计这种成像方式可能会在几年内用于标准实践。

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