Assessment of the error of measurement technique on DSA / 中华放射学杂志

ABSTRACT

Objective To explore the creation and control of measurement technique error on digital subtraction angiography (DSA). Methods The data was obtained from Advantx LCV Plus DSA system made by GE Corporation. We divided the screen into three areas, per area account for 1/3, ie, central area, middle area and outlying area. The enlargement rate or reduction rate of the target object was respectively calculated according to the different calibration, different height of the bed and different X-ray source to image distance (SID). Results The target object was enlarged gradually from the central area to the outlying area, and the lengthwise enlargement rate was more obvious than transverse. The different of target object measured by coin (diameter was 20.4 mm) with steel ball (diameter was 7.7 mm) was not significance, but the target object was underestimated significantly used the calibration by 4F catheter. When the target object was measured by the calibration in same area and same axis, the error of measurement technique was controlled rang from 1.0% to-2.5%. Conclusion This systematic investigation suggest that the screen was divided into the central area, middle area and outlying area will be beneficial to control DSA measurement error for the interventional physician. The target object was close to real size when it measured by transverse of the calibration, and the error was better controlled when the calibration was in the same area and same axis as the target object.