Center Frequency Tracking Scheme to Optimize Pulse-Echo Response of Ultrasonic A-mode Scanner Circuit Systemopen access
- Authors
- Ko, Doo-Hyeon; Lee, Young-Chan; Um, Ji-Yong
- Issue Date
- Feb-2023
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Acoustics; Transducers; Frequency response; Field programmable gate arrays; Ultrasonic imaging; Monitoring; Automata; Center frequency tracking; A-mode ultrasound; gradient-ascent algorithm; momentum optimization; finite state machine; field programmable gate array; A-mode scanner circuit system
- Citation
- IEEE ACCESS, v.11, pp.14524 - 14532
- Journal Title
- IEEE ACCESS
- Volume
- 11
- Start Page
- 14524
- End Page
- 14532
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/21556
- DOI
- 10.1109/ACCESS.2023.3244608
- ISSN
- 2169-3536
- Abstract
- This paper proposes a center frequency tracking scheme to optimize a pulse-echo response of ultrasonic A-mode scanner. A pulse-echo response of A-mode scanner represents an overall energy conversion characteristic from an actuation to an acquisition. A center frequency for optimized pulse-echo response can be varied depending on an actuation voltage, an acoustic medium, etc. Most of previous frequency tracking methods have focused on high-power continuous actuation applications, and have relied on a monitoring of phase difference between actuating voltage and current with auxiliary sensors. This work focuses on a monitoring of a peak envelope of echo without additional sensors. We employ a momentum based gradient ascent algorithm along with a finite state machine to track an optimum center frequency so that a peak envelope of echo becomes the maximum value. The proposed frequency tracking scheme was implemented on a field programmable gate array for real-time operation. We performed repetitive measurements to verify consistent frequency tracking performances for different acoustic mediums. The A-mode scanner adaptively tracked corresponding center frequencies for each of mediums within an average error of 61.7 kHz. When the A-mode scanner was in a steady state, an increment of signal-to-noise ratio (SNR) of echo was 7.4 dB, and an axial resolution was improved by 32.5 %.
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- Appears in
Collections - Department of Medical IT Convergence Engineering > 1. Journal Articles
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