3軸回転アームを用いたQCAキャリブレーションの検討 : 第1報オンラインQCA

概要

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To determine the size of the device used in coronary intervention, quantitative measurement with QCA is required. The authors performed this calibration with a triple-axis rotation arm on a vessel phantom using the IVR-shot methos, and compared the results with 11 clinical images in which catheter calibration and IVUS were used. Measurement of the vessel phantom by the IVR-shot method resulted in the least error, followed in order by IVUS and catheter calibration. We measured the proximal and distal regions of stenosis on clinical images and found differences between catheter calibration and the IVR-shot method : 0.5±0.5 mm in the proximal region and 0.3±0.1 mm in the distal region. To examine accuracy, radiograms of a 40 mmφ lead ball were obtained using both catheter calibration and IVR-shot calibration. The IVR-shot method showed significantly greater accuracy, with an error of 1.0±0.5 mm, compared with 3.4±2.1 mm for catheter calibration (P=0.01). In summary, calibration using the triple-axis rotation arm provides greater accuracy of measurement.
1998-06-20