THE EFFECTS OF MOTION ON QUANTITATIVE VESSEL MEASUREMENTS
THE EFFECTS OF MOTION ON QUANTITATIVE VESSEL MEASUREMENTS
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DOI：
10.1118/1.595651
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发表时间：
1985-01-01
期刊：
影响因子：
3.8
通讯作者：
GUSTAFSON, DE
中科院分区：
文献类型：
--
作者：
PARKER, DL;CLAYTON, PD;GUSTAFSON, DE
使用数字放射成像系统对心脏和冠状动脉等运动结构进行最佳可视化是一个难题，可能涉及时间、空间和密度分辨率之间的权衡。给出了血管尺寸的四种血管造影测量的运动依赖性并通过实验证明。尽管光密度横截面积显示与运动无关，但光密度厚度（对比度）会减小，表观宽度（边缘之间的距离）和光密度都会随着运动而增加。了解速度可以校正表观宽度，但不能校正光密度宽度。研究还表明，当前的限制导致 kVp 和 X 射线脉冲持续时间之间的权衡，严重损害了在冠状动脉成像中使用小焦点的优势。
Optimal visualization of moving structures such as the heart and coronary arteries using digital radiographic imaging systems is a difficult problem that can involve tradeoffs between temporal, spatial, and density resolution. The motion dependence of four angiographic measures of vessel dimensions is given and demonstrated experimentally. Although the densitometric cross-section area is shown to be independent of motion, densitometric thickness (contrast) decreases and the apparent width (distance between edges) and densitometric with both increase with motion. Knowledge of the velocity allows the apparent width but not the densitometric width to be corrected. It is also shown that current limitations which result in tradeoffs between kVp and X-ray pulse duration seriously compromise the advantages of using small focal spots in coronary artery imaging.