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Surface Integration of Velocity Vectors is a colour Doppler control volume technique for blood flow measurements.
Factors such as colour flow gain (CFG), pulse repetition frequency (PRF) and the number of imaging planes may
however affect the quality of measurements. Our aim was to describe how CFG and PRF affect the accuracy of Surface
Integration of Velocity Vectors (SIVV) flow in in vitro models and to investigate the number of planes required for precise
SIVV measurements in an in vitro model and in vivo at the left ventricular outflow tract. Our results show that the
measured SIVV flow varied according to the gain setting while PRF had no significant effect. At least two planes were
necessary to obtain <10% measurement error in vitro, and four planes were required for <20% measurement error in vivo.
We conclude that CFG but not PRF had significant effects on the velocity estimate. At least two and preferably >4 imaging
planes are required for precise SIVV flow measurements.