Optimizing frequency and pulse shape for ultrasound current source density imaging

Yexian Qin, Zhaohui Wang, Pier Ingram, Qian Li, Russell S Witte

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Electric field mapping is commonly used to identify irregular conduction pathways in the heart (e.g., arrhythmia) and brain (e.g., epilepsy). A new technique, ultrasound current source density imaging (UCSDI) based on the acoustoelectric (AE) effect, provides an alternative method for current activity mapping in four-dimension with high resolution. The ultrasound transducer frequency and pulse shape significantly affect the sensitivity and spatial resolution of UCSDI. In this paper, we analyze the tradeoff between spatial resolution and sensitivity in UCSDI from two aspects: (1) ultrasound transducer frequency and (2) coded excitation pulses. For frequency dependence, we imaged an electric dipole using ultrasound transducers with different center frequencies (1 MHz and 2.25 MHz) and compared the sensitivity and resolution. For coded excitation, we measured AE signals with chirp excitation at 1 MHz and demonstrated improved sensitivity for chirps (3.5 μV/mA at 1 MHz) compared with square pulse excitation (1.6 μV/mA). Pulse compression was also applied to preserve spatial resolution, demonstrating enhanced detection while preserving spatial resolution.

Original languageEnglish (US)
Title of host publicationIEEE International Ultrasonics Symposium, IUS
Pages2138-2141
Number of pages4
DOIs
StatePublished - 2011
Event2011 IEEE International Ultrasonics Symposium, IUS 2011 - Orlando, FL, United States
Duration: Oct 18 2011Oct 21 2011

Other

Other2011 IEEE International Ultrasonics Symposium, IUS 2011
CountryUnited States
CityOrlando, FL
Period10/18/1110/21/11

Fingerprint

spatial resolution
transducers
sensitivity
chirp
pulses
excitation
epilepsy
arrhythmia
pulse compression
tradeoffs
preserving
electric dipoles
brain
conduction
electric fields
high resolution

Keywords

  • acoustoelectric
  • cardiac arrhythmia mapping
  • coded excitation chirps
  • ECG

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Qin, Y., Wang, Z., Ingram, P., Li, Q., & Witte, R. S. (2011). Optimizing frequency and pulse shape for ultrasound current source density imaging. In IEEE International Ultrasonics Symposium, IUS (pp. 2138-2141). [6293619] https://doi.org/10.1109/ULTSYM.2011.0530

Optimizing frequency and pulse shape for ultrasound current source density imaging. / Qin, Yexian; Wang, Zhaohui; Ingram, Pier; Li, Qian; Witte, Russell S.

IEEE International Ultrasonics Symposium, IUS. 2011. p. 2138-2141 6293619.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Qin, Y, Wang, Z, Ingram, P, Li, Q & Witte, RS 2011, Optimizing frequency and pulse shape for ultrasound current source density imaging. in IEEE International Ultrasonics Symposium, IUS., 6293619, pp. 2138-2141, 2011 IEEE International Ultrasonics Symposium, IUS 2011, Orlando, FL, United States, 10/18/11. https://doi.org/10.1109/ULTSYM.2011.0530
Qin Y, Wang Z, Ingram P, Li Q, Witte RS. Optimizing frequency and pulse shape for ultrasound current source density imaging. In IEEE International Ultrasonics Symposium, IUS. 2011. p. 2138-2141. 6293619 https://doi.org/10.1109/ULTSYM.2011.0530
Qin, Yexian ; Wang, Zhaohui ; Ingram, Pier ; Li, Qian ; Witte, Russell S. / Optimizing frequency and pulse shape for ultrasound current source density imaging. IEEE International Ultrasonics Symposium, IUS. 2011. pp. 2138-2141
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