In vivo measurement of shear modulus of the human cornea using optical coherence elastography.

In vivo measurement of shear modulus of the human cornea using optical coherence elastography.
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DOI:
10.1038/s41598-020-74383-4
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发表时间:
2020-10-15
期刊:
影响因子:
4.6
通讯作者:
Yun SH
Yun SH
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ramier A;Eltony AM;Chen Y;Clouser F;Birkenfeld JS;Watts A;Yun SH

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对于眼压和物理干预而言,角膜僵硬在塑造角膜方面起着至关重要的作用。然而,非侵入性地测量材料的力学性能仍然是困难的。在这里,我们报告了第一次使用基于表面弹性波的光学相干弹性成像(OCE)测量活体人类角膜的剪切模数。在12名年龄在25岁至67岁之间的健康受试者的初步研究中,瑞雷波速度为7.86 ± 0.75m/S,对应的剪切模数为72 ± 14kPa.我们的数据揭示了两个意想不到的趋势:在13-18毫米汞柱范围内,波速与眼压之间没有发现相关性,切变模数随着年龄的增加而下降(每十年− 0.32 ± 0.17m/S)。我们认为剪切硬度是由纤维间基质决定的,而拉伸强度是由胶原纤维决定的。瑞雷波OCE可用于临床诊断、屈光手术和治疗监测。
Corneal stiffness plays a critical role in shaping the cornea with respect to intraocular pressure and physical interventions. However, it remains difficult to measure the mechanical properties noninvasively. Here, we report the first measurement of shear modulus in human corneas in vivo using optical coherence elastography (OCE) based on surface elastic waves. In a pilot study of 12 healthy subjects aged between 25 and 67, the Rayleigh-wave speed was 7.86 ± 0.75 m/s, corresponding to a shear modulus of 72 ± 14 kPa. Our data reveal two unexpected trends: no correlation was found between the wave speed and IOP between 13–18 mmHg, and shear modulus decreases with age (− 0.32 ± 0.17 m/s per decade). We propose that shear stiffness is governed by the interfibrillar matrix, whereas tensile strength is dominated by collagen fibrils. Rayleigh-wave OCE may prove useful for clinical diagnosis, refractive surgeries, and treatment monitoring.
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