Demonstration of the performance of tiered sub-aperture directivity indexing for different regions of interest in needle tracking using the Verasonics Vantage 128 research ultrasound platform

At 0.02-0.14 - Region of interest is at the left of the transducer
At 0.16-0.27 - Region of interest is at the center of the transducer
At 0.30-0.45 - Region of interest is at the right of the transducer

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