Design and Simulation of a Ring-Shaped Linear Array for Microultrasound Capsule Endoscopy

Holly S. Lay, Benjamin F. Cox, Vipin Seetohul, Christine E. M. Démoré, Sandy Cochran

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
153 Downloads (Pure)

Abstract

Video capsule endoscopy (VCE) has significantly advanced visualization of the gastrointestinal tract since its introduction in the last 20 years. Work is now under way to combine VCE with microultrasound imaging. However, small maximum capsule dimensions, coupled with the electronics required to integrate ultrasound imaging capabilities, pose significant design challenges. This paper describes a simulation process for testing transducer geometries and imaging methodologies to achieve satisfactory imaging performance within the physical limitations of the capsule size and outlines many of the tradeoffs needed in the design of this new class of ultrasound capsule endoscopy (USCE) device. A hybrid MATLAB model is described, incorporating Krimholtz-Leedom-Matthaei circuit elements and digitizing and beamforming elements to render a gray-scale B-mode. This model is combined with a model of acoustic propagation to generate images of point scatterers. The models are used to demonstrate the performance of a USCE transducer configuration comprising a single, unfocused transmit ring of radius 5 mm separated into eight segments for electrical impedance control and a 512-element receive linear array, also formed into a ring. The MATLAB model includes an ultrasonic pulser circuit connected to a piezocrystal composite transmit transducer with a center frequency of 25 MHz. B-scan images are simulated for wire target phantoms, multilayered phantoms, and a gut wall model. To demonstrate the USCE system's ability to image tissue, a digital phantom was created from single-element ultrasonic transducer scans of porcine small bowel ex vivo obtained at a frequency of 45 MHz.

Original languageEnglish
Pages (from-to)589-599
Number of pages11
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume65
Issue number4
Early online date15 Jan 2018
DOIs
Publication statusPublished - Apr 2018

Keywords

  • Acoustics
  • capsule endoscopy
  • Computational modeling
  • endoscopic ultrasound
  • gastrointestinal tract
  • high resolution ultrasound
  • Imaging
  • Integrated circuit modeling
  • KLM
  • Mathematical model
  • system modelling
  • Transducers
  • Ultrasonic imaging
  • ultrasound circuits

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