Probe Design Optimization for Time-Domain NIROT “Pioneer” System for Imaging the Oxygenation of the Preterm Brain

A. Di Costanzo-Mata*, J. Jiang, S. Lindner, C. Zhang, E. Charbon, M. Wolf, A. Kalyanov

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeChapterScientificpeer-review

Abstract

In preterm infants, there is a risk of life-lasting impairments due to hemorrhagic/ischemic lesions. Our time-domain (TD) near-infrared optical tomography (NIROT) system “Pioneer” aims at detecting both disorders with high spatial resolution. Successfully tested on phantoms, “Pioneer” entered the phase of improvements and enhancements. The current probe (A-probe) was adapted for an optoacoustics instrument. A new probe (B-probe) optimized for TD measurements is required. Our aim is to determine the optimal arrangement of light sources in the B-probe to increase the sensitivity and the resolution of Pioneer and to improve the ability of the system to detect both ischemia and hemorrhage. To do this, we simulated TD-NIROT signals in NIRFAST, a MATLAB-based package used to model near-infrared light propagation through tissue. We used 16 × 16 detector array, with ~2.2 mm distance between the detectors. Light sources were arranged around the field of view (FoV). We performed forward simulations of light propagation through a “homogeneous case” (HC) tissue (μ′s = 5.6 cm−1, μa = 0.07 cm−1). Next, we simulated light propagation through “inhomogeneous case” -tissue’ (IC) tissue by adding ischemia (μa = μa · 2.5 cm−1) or hemorrhage (μa = μa · 50 cm−1) to HT as a spherical inclusion of 5 mm radius at different depths in the FoV center and identified the source location that provides the higher contrast on the FoV: maxi ∈ I (FoVContrastSOURCE). It was found that sources located closer to the FoV center generate greater contrast for late photons. This study suggests the light sources in B-probe should be closer to the FoV center. The higher sensitivity is expected to lead to a higher image quality.

Original languageEnglish
Title of host publicationOxygen transport to Tissue XLII
EditorsE.M. Nemoto
PublisherSpringer Open
Pages359-363
Number of pages5
ISBN (Electronic)978-3-030-48238-1-57
DOIs
Publication statusPublished - 2021

Publication series

NameAdvances in Experimental Medicine and Biology
Volume1269
ISSN (Print)0065-2598
ISSN (Electronic)2214-8019

Keywords

  • Near-infrared optical tomography (NIROT)
  • Time-domain imaging
  • Time-domain NIROT
  • Time-domain simulations
  • Tissue oxygenation

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