| Prior to coronary angioplasty, the size of the device to be used needs to be measured by quantitative coronary artery analysis. We published the first report on the benefits of the IVR-shot calibration method using a triple rotational axis arm with an on-line system, compared with the calibration method of using catheter size, in a vessel phantom and 11 clinical cases. In this report, by using the same IVR-shot method with an off-line system, we found that the result was closer to the actual value. From the measurement of clinical cases, we obtained a 0.3 ± 0.2 mm error by both the catheter method and IVR-shot method. To examine precision, we measured the size of a 40 mm lead ball image by both the catheter method and IVR-shot method. The error of the catheter method was 1.1 ± 0.5 mm, while that of IVR-shot was 0.5 ± 0.3 mm, indicating that IVR-shot was significantly more precise(p < 0.01). More precise results were obtained by off-line calibration with a triple rotational axis. |
