Bentley Ellison, Miller Paul E, Diehl Kathryn A
Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706-1102, USA.
J Am Vet Med Assoc. 2003 Dec 1;223(11):1617-22, 1599. doi: 10.2460/javma.2003.223.1617.
The recent development of a 20-MHz, high-frequency ultrasound probe has allowed tissue to be visualized at resolutions of 20 to 80 microm, which is similar to a low-power histologic view. This high degree of resolution, however, limits tissue penetration to 5 to 10 mm, which is ideal for examination of the anterior segment of the eye. The detail provided by high-resolution ultrasound readily permits the clinician to distinguish between various anterior segment entities that may appear similar but are treated quite differently, such as anterior uveal tumors, iridociliary cysts, and iris bombé. High-frequency ultrasound is also a valuable aid in creating a surgical plan for treatment of ocular disorders in which the cornea is opaque, such as feline corneal sequestrum and tumor invasion into the cornea. Other applications of this technology include elucidation of the pathogenesis of glaucoma in veterinary patients and evaluation of regions of the lens that are difficult to examine directly.
近期研发的一款20兆赫兹高频超声探头能够以20至80微米的分辨率对组织进行成像，这类似于低倍组织学观察。然而，这种高分辨率限制了组织穿透深度至5至10毫米，这对于眼前节检查而言是理想的。高分辨率超声所提供的细节使临床医生能够轻易区分各种看似相似但治疗方法截然不同的眼前节病变，如前葡萄膜肿瘤、虹膜睫状体囊肿和虹膜膨隆。高频超声在为角膜混浊的眼部疾病制定手术治疗方案时也是一项有价值的辅助手段，比如猫角膜腐骨和肿瘤侵犯角膜。该技术还可用于阐明兽医患者青光眼的发病机制以及评估晶状体中难以直接检查的区域。
