Evaluating online filtering algorithms to enhance dynamic multispectral optoacoustic tomography

Devin O'Kelly, Yihang Guo, Ralph P. Mason

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Multispectral optoacoustic tomography (MSOT) is an emerging imaging modality, which is able to capture data at high spatiotemporal resolution using rapid tuning of the excitation laser wavelength. However, owing to the necessity of imaging one wavelength at a time to the exclusion of others, forming a complete multispectral image requires multiple excitations over time, which may introduce aliasing due to underlying spectral dynamics or noise in the data. In order to mitigate this limitation, we have applied kinematic α and αβ filters to multispectral time series, providing an estimate of the underlying multispectral image at every point in time throughout data acquisition. We demonstrate the efficacy of these methods in suppressing the inter-frame noise present in dynamic multispectral image time courses using a multispectral Shepp-Logan phantom and mice bearing distinct renal cell carcinoma tumors. The gains in signal to noise ratio provided by these filters enable higher-fidelity downstream analysis such as spectral unmixing and improved hypothesis testing in quantifying the onset of signal changes during an oxygen gas challenge.

Original languageEnglish (US)
Article number100184
JournalPhotoacoustics
Volume19
DOIs
StatePublished - Sep 2020

Keywords

  • Dynamic response
  • Hemoglobin
  • Kidney tumor
  • Noise suppression
  • Oxygen
  • Photoacoustic imaging

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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