Accurate detection of low signal-to-noise ratio neuronal calcium transient waves using a matched filter

Agnieszka F. Szymanska, Chiaki Kobayashi, Hiroaki Norimoto, Tomoe Ishikawa, Yuji Ikegaya, Zoran Nenadic

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Background: Calcium imaging has become a fundamental modality for studying neuronal circuit dynamics both in vitro and in vivo. However, identifying calcium events (CEs) from spectral data remains laborious and difficult, especially since the signal-to-noise ratio (SNR) often falls below 2. Existing automated signal detection methods are generally applied at high SNRs, leaving a large need for an automated algorithm that can accurately extract CEs from fluorescence intensity data of SNR 2 and below. New method: In this work we develop a Matched filter for Mult. i-unit Calcium Event (MMiCE) detection to extract CEs from fluorescence intensity traces of simulated and experimentally recorded neuronal calcium imaging data. Results: MMiCE reached perfect performance on simulated data with SNR ≥ 2 and a true positive (TP) rate of 98.27% (± 1.38% with a 95% confidence interval), and a false positive(FP) rate of 6.59% (± 2.56%) on simulated data with SNR 0.2. On real data, verified by patch-clamp recording, MMiCE performed with a TP rate of 100.00% (± 0.00) and a FP rate of 2.04% (± 4.10). Comparison with existing method(s): This high level of performance exceeds existing methods at SNRs as low as 0.2, which are well below those used in previous studies (SNR ≃ 5-10). Conclusion: Overall, the MMiCE detector performed exceptionally well on both simulated data, and experimentally recorded neuronal calcium imaging data. The MMiCE detector is accurate, reliable, well suited for wide-spread use, and freely available at sites.uci.edu/aggies or from the corresponding author.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalJournal of Neuroscience Methods
Volume259
DOIs
Publication statusPublished - 2016 Feb 1

Keywords

  • Calcium transients
  • Dendritic spines
  • Detection
  • Low SNR
  • Matched filter
  • Multineuron calcium imaging
  • Somatic calcium fluctuations

ASJC Scopus subject areas

  • Neuroscience(all)

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