Dyke W P, Barbour J P, Charbonnier F M
Radiology. 1975 Oct;117(1):159-64. doi: 10.1148/117.1.159.
Depth resolution, a measure of the thinnest layer of tissue which will cast a detectable radiographic shadow, significantly limits visibility in conventional chest technique. Depth resolution, averaged over the chest area, improves with increasing kilovoltage, and thin, soft tissues can be seen more readily. The visibility of calcifications increases with kilovoltage in some areas of the chest and decreases in others, which is again explained by depth resolution. Densitometric data verify the mechanism involved: the latitude of the radiographic image matches that of the conventional film at high kilovoltages, so that more chest images are recorded at high contrast where visibility is best.
深度分辨率是指能够产生可检测到的放射影像阴影的最薄组织层的度量，它在传统胸部检查技术中显著限制了可视性。在整个胸部区域平均计算的深度分辨率会随着千伏数的增加而提高，薄的软组织能更容易被看到。钙化灶的可视性在胸部某些区域随千伏数增加而增加，在其他区域则降低，这同样可以用深度分辨率来解释。密度测量数据证实了其中涉及的机制：在高千伏数时，放射影像的宽容度与传统胶片的宽容度相匹配，因此在可视性最佳的高对比度下能记录更多的胸部影像。
