Accuracy of three-dimensional quantification of left ventricular function using magnetic sensor acquisition: a dynamic in vitro model.

J. Xu, Y. Wu, X. Li, G. Elsedfy, J. Li, J. Lee, C. H. Davies, D. J. Sahn

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Abstract

OBJECTIVE: To evaluate the accuracy of a three-dimensional (3D) magnetic position sensor system in the quantification of ventricular stroke volumes in a dynamic model. METHODS: A latex balloon model of the left ventricle was suspended in a water bath connected to a pump producing 10 different pulsatile stroke volumes (15-65 ml/beat). Scanning was performed using a 5.0 mHz transducer mounted with a Flock of Birds (FOB) magnetic receiver (GE System Five). The probe was scanned to sweep continuously across and over the balloon volume over 3-7 seconds. Digital loops were stored on magneto-optical disks and reviewed retrospectively using 3D Echopac software (GE) based on Simpson's method and compared with a two-dimensional (2D) biplane area-length method (1/2 L x R) measurements at end systole and end diastole. Both 3D and 2D derived stroke volumes were compared with the reference stroke volume calculated by direct measurement of balloon capacity. RESULTS: There was an improved correlation between 3D stroke volume and reference stroke volume (y = 0.91x + 0.41, r = 0.97, SEE = 2.83 ml, P = 0.0001) compared to 2D stroke volume and reference stroke volume (y = 0.49x + 8.68, r = 0.87, SEE = 3.87 ml, P = 0.0011, difference between 2D and 3D P < 0.003). CONCLUSION: 3D magnetic FOB scanning is practical, accurate and should facilitate assessment of left ventricular function.

Original languageEnglish (US)
Pages (from-to)1011-1014
Number of pages4
JournalChinese medical journal
Volume114
Issue number10
StatePublished - Oct 2001

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ASJC Scopus subject areas

  • Medicine(all)

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Xu, J., Wu, Y., Li, X., Elsedfy, G., Li, J., Lee, J., Davies, C. H., & Sahn, D. J. (2001). Accuracy of three-dimensional quantification of left ventricular function using magnetic sensor acquisition: a dynamic in vitro model. Chinese medical journal, 114(10), 1011-1014.