Accuracy and precision of online quantitative coronary angiography with automatic calibration: a pilot study

Revista Brasileira de Cardiologia Invasiva (English Edition) Pub Date : 2015-01-01 DOI:10.1016/j.rbciev.2015.01.003

Fábio Augusto Pinton, Breno de Alencar Araripe Falcão, José Mariani Jr., Luiz Junya Kajita, Antonio Esteves Filho, Pedro A. Lemos Neto

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引用次数: 1

Abstract

Background

The objective of this study was to evaluate the degree of accuracy, precision, correlation, and agreement between the measurements performed by online Quantitative Coronary Angiography (QCA) software with automatic calibration.

Methods

Pilot study that analyzed angiographic images of ten patients through online QCA software using Auto ISO (automatic calibration isocenter) and Auto TOD (Table-to-Object Distance) automatic calibration. Catheter size was measured by both methods and the reference diameter was computed. These measurements were compared with the measurement of catheter diameter regarding accuracy, precision, and agreement.

Results

The actual average of the catheter diameter was 1.75 ± 0.32 mm (range 1.33 to 2.67 mm). The measurement of catheters by TOD QCA and ISO QCA resulted in mean diameters of 1.78 ± 0.37 mm and 1.88 ± 0.38 mm, respectively. The accuracy/precision of the TOD QCA and the ISO QCA was 0.03 mm/0.21 mm and 0.12 mm/0.20 mm, respectively. The TOD QCA and ISO QCA measures were among the limits of agreement in 96.3 and 94.7% of cases, respectively, and were significantly correlated (rs = 0.93, p < 0.01). However, despite the small difference between the methods (0.10 ± 0.10 mm), the ISO QCA measures were significantly higher than those obtained by the TOD QCA (p < 0.01).

Conclusions

Online QCA with automatic calibration has good accuracy, precision, and correlation, which may represent a promising tool in the catheterization laboratory.

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自动校准在线定量冠状动脉造影的准确性和精密度:一项初步研究

本研究的目的是评估在线定量冠状动脉造影(QCA)软件自动校准测量结果的准确性、精密度、相关性和一致性。方法采用Auto ISO(自动标定等中心)和Auto TOD(表物距离)自动标定，通过在线QCA软件对10例患者的血管造影图像进行分析。两种方法均测量导管尺寸并计算参考直径。将这些测量结果与导管直径测量结果在准确性、精密度和一致性方面进行比较。结果实际平均导管直径为1.75±0.32 mm (1.33 ~ 2.67 mm)。TOD QCA和ISO QCA测量的导管平均直径分别为1.78±0.37 mm和1.88±0.38 mm。TOD QCA和ISO QCA的准确度/精密度分别为0.03 mm/0.21 mm和0.12 mm/0.20 mm。TOD QCA和ISO QCA措施分别在96.3和94.7%的病例中处于一致范围内，并且显著相关(rs = 0.93, p <0.01)。然而，尽管两种方法之间的差异很小(0.10±0.10 mm)，但ISO QCA测量值显著高于TOD QCA测量值(p <0.01)。结论在线QCA自动定标具有良好的准确度、精密度和相关性，是一种有发展前景的导管实验室质量评价工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Brasileira de Cardiologia Invasiva (English Edition)

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