在轻和黑之间的变化的水准在一幅图像或者在他们最大之间的比率内估价领域以及最小价值。
The level of variation between light and dark values areas in an image, or the ratio between their maximum and minimum values.
结论：多方位、多角度摄取图像，SA软件、RS软件及目测法综合运用可提高冠脉狭窄的评估价值。
Conclusion: To acquire the accuracy of assessment of coronary narrowing by multidimensional images and combined using of SA software, RS software and eyeballing.
提出用重建的图像的质量来估价运动参数误差，并给出了误差面积和轮廓转折率误差二个函数。
A method of estimation of motion parameter error based on the quality of reconstructed image is suggested. That area error and contour transition turn error is used to be quality criteria.
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