Finet G, Liénard J
Cardiology Hospital, Lyon, France.
Int J Card Imaging. 1996 Dec;12(4):271-87. doi: 10.1007/BF01797741.
The limited resolution of any imaging system causes edge blurring of objects acquired with X-ray. In digital angiography, this effect combined with noise gives rise to systematic and random errors in the determination of vessel dimensions. The influence of bandwidth limitation on the estimation of tube diameter is established by a theoretical approach: it leads to over and underestimations of catheter and vessel diameter dimensions. Therefore a correction is proposed that counterbalances the point spread function (PSF) offset. The residual inaccuracy and the variability of measurement of phantom tubes are analyzed and evaluated in controlled conditions. Some of the parameters which govern their extent are identified: field-of-view, catheter size, concentration of contrast agent.
任何成像系统有限的分辨率都会导致通过X射线获取的物体边缘模糊。在数字血管造影中，这种效应与噪声相结合，会在血管尺寸的测定中产生系统误差和随机误差。通过理论方法确定了带宽限制对管径估计的影响：它会导致对导管和血管直径尺寸的高估和低估。因此，提出了一种校正方法，以抵消点扩散函数（PSF）偏移。在受控条件下分析和评估了体模管测量的残余误差和变异性。确定了一些控制其范围的参数：视野、导管尺寸、造影剂浓度。
