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, David Sahn

Research output: Contribution to journalArticle

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
Externally publishedYes

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Left Ventricular Function
Stroke Volume
Birds
Diastole
In Vitro Techniques
Systole
Latex
Transducers
Baths
Heart Ventricles
Software
Water

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Accuracy of three-dimensional quantification of left ventricular function using magnetic sensor acquisition : a dynamic in vitro model. / Xu, J.; Wu, Y.; Li, X.; Elsedfy, G.; Li, J.; Lee, J.; Davies, C. H.; Sahn, David.

In: Chinese Medical Journal, Vol. 114, No. 10, 10.2001, p. 1011-1014.

Research output: Contribution to journalArticle

Xu, J, Wu, Y, Li, X, Elsedfy, G, Li, J, Lee, J, Davies, CH & Sahn, D 2001, 'Accuracy of three-dimensional quantification of left ventricular function using magnetic sensor acquisition: a dynamic in vitro model.', Chinese Medical Journal, vol. 114, no. 10, pp. 1011-1014.
Xu, J. ; Wu, Y. ; Li, X. ; Elsedfy, G. ; Li, J. ; Lee, J. ; Davies, C. H. ; Sahn, David. / Accuracy of three-dimensional quantification of left ventricular function using magnetic sensor acquisition : a dynamic in vitro model. In: Chinese Medical Journal. 2001 ; Vol. 114, No. 10. pp. 1011-1014.
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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.",
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