Koning G, van Meurs B A, Haas H, Reiber J H
Department of Diagnostic Radiology and Nuclear Medicine, University Hospital, Leiden, The Netherlands.
Cathet Cardiovasc Diagn. 1995 Feb;34(2):175-85. doi: 10.1002/ccd.1810340421.
Digital coronary and left ventricular angiography demand high transfer rates and very large data storage if all the clinical data are to be achieved. If appropriate compression schemes were available without compromising the quality and resolution of the image data, such demands could be lessened. In this study we compared the influence of different compression factors of the Adaptive Real Time Image Compression (ARTIC) scheme used on the Philips DCI-SX systems on coronary measurements assessed with the Automated Coronary Analysis (ACA) package. Loss-free acquired images of size 512(2) x 8 bits, which had been stored digitally on tape, were reloaded into the DCI with compression factors of 2, 3, and 4; only the factor 2 is loss free. To evaluate the effect of the different data compressions on the accuracy of the measurements, the diameters of a vessel phantom (tube sizes ranging from 0.687 to 5.062 mm) were determined. To evaluate the reproducibility of the results, the intraobserver variability was determined for the different compression factors from 40 coronary obstructions. The differences in the reference diameter measurements of the vessel phantom were -0.03 +/- 0.06 mm, 0.01 +/- 0.07 mm, and 0.04 +/- 0.08 mm for the compression factors 2 (loss free), 3, and 4, respectively. The results were not statistically significantly different. The intraobserver variabilities in the obstruction diameter measurements of the coronary obstructions were -0.04 +/- 0.13 mm, 0.00 +/- 0.14 mm, and 0.02 +/- 0.13 mm for the compression factors 2, 3 and 4, respectively. The intraobserver variabilities in the reference diameter measurements were -0.02 +/- 0.12 mm, 0.01 +/- 0.09 mm, and 0.03 +/- 0.09 mm for the compression factors 2, 3, and 4, respectively. The intraobserver variabilities of the percent diameter stenosis were 0.96 +/- 4.19%, -0.01 +/- 4.88% and -0.04 +/- 4.68% for the compression factors 2, 3, and 4, respectively. None of these differences were statistically significant. Both from a qualitative and quantitative point of view, data compression factors 3 and 4 are acceptable in digital coronary arteriography.
如果要获取所有临床数据，数字冠状动脉造影和左心室造影需要高传输速率和非常大的数据存储量。如果能有合适的压缩方案而不影响图像数据的质量和分辨率，这样的需求就可以减轻。在本研究中，我们比较了飞利浦DCI-SX系统上使用的自适应实时图像压缩（ARTIC）方案的不同压缩因子对使用自动冠状动脉分析（ACA）软件包评估的冠状动脉测量的影响。将已以数字方式存储在磁带上的大小为512(2)×8位的无损采集图像，以压缩因子2、3和4重新加载到DCI中；只有因子2是无损的。为了评估不同数据压缩对测量准确性的影响，测定了血管模型（管尺寸范围为0.687至5.062毫米）的直径。为了评估结果的可重复性，测定了40个冠状动脉狭窄处不同压缩因子的观察者内变异性。血管模型参考直径测量的差异，对于压缩因子2（无损）、3和4分别为-0.03±0.06毫米、0.01±0.07毫米和0.04±0.08毫米。结果在统计学上无显著差异。冠状动脉狭窄处狭窄直径测量的观察者内变异性，对于压缩因子2、3和4分别为-0.04±0.13毫米、0.00±0.14毫米和0.02±0.13毫米。参考直径测量的观察者内变异性，对于压缩因子2、3和4分别为-0.02±0.12毫米、0.01±0.09毫米和0.03±0.09毫米。狭窄百分比直径的观察者内变异性，对于压缩因子2、3和4分别为0.96±4.19%、-0.01±4.88%和-0.04±4.68%。这些差异均无统计学意义。从定性和定量的角度来看，数据压缩因子3和4在数字冠状动脉造影中是可以接受的。
