The zero point of the density scale is defined by having no specimen in the densitometer.
定义密度计内没有样品时的密度为密度尺标的零点。
Objective To evaluate the feasibility and the value of video density scale (VDS) for assessing myocardial microperfusion.
目的探讨视频密度阶差（VDS）评价冠脉造影时心肌微灌注的可行性及应用价值。
Materials and Methods: Video density scale and CTFC were calculated and compared on 98 cases off coronary catheter angiography.
材料和方法：计算98例冠脉造影者的CTFC和视频密度阶差。
Materials and Methods: Video density scale and CTFC were calculated and compared on 98 cases off coronary catheter angiography.
材料和方法：计算98例冠脉造影者的CTFC和视频密度阶差。
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