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X-WR-CALNAME:Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系
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X-WR-CALDESC:Events for Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系
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TZID:Asia/Hong_Kong
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DTSTART:20250101T000000
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DTSTART;TZID=Asia/Hong_Kong:20260320T090000
DTEND;TZID=Asia/Hong_Kong:20260320T100000
DTSTAMP:20260511T074929
CREATED:20260311T024703Z
LAST-MODIFIED:20260311T024703Z
UID:115299-1773997200-1774000800@ece.hku.hk
SUMMARY:RPG Seminar – Synthetic Aperture for High Spatial Resolution Acoustoelectric Imaging
DESCRIPTION:Zoom Link:\nhttps://hku.zoom.us/j/97208194193 \nAbstract\nAcoustoelectric imaging (AEI) refers to the mapping of electric fields in electrolyte and tissue media by measuring the acoustoelectric (AE) effect. It shows promise for non-invasive electrophysiological mapping down to the resolution of diagnostic ultrasound imaging. AE signals are typically induced by applying focused ultrasound (FUS) waves\, which sift out the electric signals at a defined focal spot. However\, the spatial resolution of FUS-AEI is limited by the finite focal extent. To achieve improved AEI spatial resolution across the full imaging depth\, we propose to perform AEI by adopting a Synthetic Aperture (SA) approach. SA-AEI images were reconstructed through pixel-oriented delay-and-sum of the unfocused AE signals. Experiments were done on an NaCl volume and an ex vivo lobster nerve. Overall\, SA-AEI exhibited superior lateral resolution compared to FUS-AEI\, particularly for electric targets outside the focal zone of FUS-AEI. Due to inherently lower SNR of the SA approach\, we further proposed coherence-based beamforming to enhance the image quality of SA-AEI images. We envision that proposed SA-AEI would be a useful strategy for AEI\, when spatial resolution is the top imaging performance criterion and prior locations of bioelectric sources are unknown. \nSpeaker\nMr. Wei Yi Oon\nDepartment of Electrical and Computer Engineering\nThe University of Hong Kong \nBiography of the Speaker\nWei Yi OON received his BEng in Medical Engineering from The University of Hong Kong in 2021. He is currently pursuing the Ph.D. degree in the Department of Electrical and Computer Engineering at the University of Hong Kong\, with a research focus on acoustoelectric imaging. \nOrganiser\nProf. Wei-Ning Lee\nDepartment of Electrical and Computer Engineering\, The University of Hong Kong \nAll are welcome.
URL:https://ece.hku.hk/events/20260320/
LOCATION:Room CB-603\, 6/F\, Chow Yei Ching Building\, The University of Hong Kong
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/11/rpg-seminar.jpg
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