TY - JOUR
T1 - Accuracy of three-dimensional quantification of left ventricular function using magnetic sensor acquisition
T2 - a dynamic in vitro model.
AU - Xu, J.
AU - Wu, Y.
AU - Li, X.
AU - Elsedfy, G.
AU - Li, J.
AU - Lee, J.
AU - Davies, C. H.
AU - Sahn, D. J.
PY - 2001/10
Y1 - 2001/10
N2 - 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.
AB - 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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M3 - Article
C2 - 11677755
AN - SCOPUS:27244436012
SN - 0366-6999
VL - 114
SP - 1011
EP - 1014
JO - Chinese medical journal
JF - Chinese medical journal
IS - 10
ER -