MEASUREMENT OF VESSEL TORTUOSITY ON FUNDUS PHOTOGRAPHS
MEASUREMENT OF VESSEL TORTUOSITY ON FUNDUS PHOTOGRAPHS
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DOI：
10.1007/bf00414653
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发表时间：
1979-01-01
期刊：
影响因子：
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通讯作者：
BRACHER, D
中科院分区：
文献类型：
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作者：
LOTMAR, W;FREIBURGHAUS, A;BRACHER, D
定量测量人类视网膜血管弯曲及其在眼底照片上的变化是获得新生儿窒息事件过程信息的一种敏感手段，几乎与摄影过程产生的偏差无关。将一条曲折的血管细分为单条弧线，测量弦长，并在胶片的投影图像上测量每条弧线的箭头高度。从这些图中，可以通过一个简单的近似公式来推导出与弦相比，圆弧的相对长度增加的相当准确的值。忽略了在普通照片上看不到的第三维，只会带来一个小错误。训练有素的观察员实现了相对长度变化约1%的重复性结果。[观察到与高血压、缩窄和其他心血管畸形有关的视网膜血管异常弯曲。]
Quantitative measurement of human retinal blood vessel tortuosity and its variation on fundus photographs is a sensitive means of obtaining information about the course of an asphyctic event in newborns, virtually independent of bias produced by the photographic process. A tortuous vessel was subdivided into single arcs, the chord length was measured and the arrow height of every arc was on a projected image of the film. From these figures, a fairly accurate value for the relative length increase of the arc, as compared with the chord, can be derived by a simple approximation formula. Neglect of the 3rd dimension, not visible on an ordinary photograph, entails only a small error. Trained observers achieve results reproducible to about 1% in relative length variation. [Abnormal tortuosity of retinal vessels has been observed in connection with hypertension coarctation and other cardiovascular malformations.].