Estimation of simultaneous BOLD and dynamic FDG metabolic brain activations using a multimodality concatenated ICA (mcICA) method

Shen Li, Sharna Jamadar, Phillip G.D. Ward, Gary Egan, Zhaolin Chen

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Simultaneous magnetic resonance and positron emission tomography provides an opportunity to measure brain haemodynamics and metabolism in a single scan session, and to identify brain activations from multimodal measurements in response to external stimulation. However, there are few analysis methods available for jointly analysing the simultaneously acquired blood-oxygen-level dependant functional MRI (fMRI) and 18-F-fluorodeoxyglucose functional PET (fPET) datasets. In this work, we propose a new multimodality concatenated ICA (mcICA) method to identify joint fMRI-fPET brain activations in response to a visual stimulation task. The mcICA method produces a fused map from the multimodal datasets with equal contributions of information from both modalities, measured by entropy. We validated the method in silico, and applied it to an in vivo visual stimulation experiment. The mcICA method estimated the activated brain regions in the visual cortex modulated by both BOLD and FDG signals. The mcICA provides a fully data-driven analysis approach to analyse cerebral haemodynamic response and glucose uptake signals arising from exogenously induced neuronal activity.

Original languageEnglish
Article number117603
Number of pages11
JournalNeuroImage
Volume226
DOIs
Publication statusPublished - 1 Feb 2021

Keywords

  • FDG PET
  • FMRI
  • FPET
  • ICA
  • McICA
  • Multimodal data analysis
  • PET/MR
  • Simultaneous MR-PET

Cite this