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Ronnie Wirestam

Professor

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Test-retest analysis of cerebral oxygen extraction estimates in healthy volunteers : comparison of methods based on quantitative susceptibility mapping and dynamic susceptibility contrast magnetic resonance imaging

Författare

  • Ronnie Wirestam
  • Anna Lundberg
  • Arthur Chakwizira
  • Danielle van Westen
  • Linda Knutsson
  • Emelie Lind

Summary, in English

Background: Estimation of the oxygen extraction fraction (OEF) by quantitative susceptibility mapping (QSM) magnetic resonance imaging (MRI) is promising but requires systematic evaluation. Extraction of OEF-related information from the tissue residue function in dynamic susceptibility contrast MRI (DSC-MRI) has also been proposed. In this study, whole-brain OEF repeatability was investigated, as well as the relationships between QSM-based OEF and DSC-MRI-based parameters, i.e., mean transit time (MTT) and an oxygen extraction index, referred to as apparent OEF (AOEF). Method: Test-retest data were obtained from 20 healthy volunteers at 3 T. QSM maps were reconstructed from 3D gradient-echo MRI phase data, using morphology-enabled dipole inversion. DSC-MRI was accomplished using gradient-echo MRI at a temporal resolution of 1.24 s. Results: The whole-brain QSM-based OEF was (40.4±4.8) % and, in combination with a previously published cerebral blood flow (CBF) estimate, this corresponds to a cerebral metabolic rate of oxygen level of CMRO2 = 3.36 ml O2/min/100 g. The intra-class correlation coefficient [ICC(2,1)] for OEF test-retest data was 0.73. The MTT-versus-OEF and AOEF-versus-OEF relationships showed correlation coefficients of 0.61 (p = 0.004) and 0.52 (p = 0.019), respectively. Discussion: QSM-based OEF showed a convincing absolute level and good test-retest results in terms of the ICC. Moderate to good correlations between QSM-based OEF and DSC-MRI-based parameters were observed. The present results constitute an indicator of the level of robustness that can be achieved without applying extraordinary resources in terms of MRI equipment, imaging protocol, QSM reconstruction, and OEF analysis.

Avdelning/ar

  • Medicinsk strålningsfysik, Lund
  • MR Physics
  • Diagnostisk radiologi, Lund
  • Neuroradiologi
  • MultiPark: Multidisciplinary research focused on Parkinson´s disease

Publiceringsår

2022-12

Språk

Engelska

Publikation/Tidskrift/Serie

Heliyon

Volym

8

Issue

12

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Radiology, Nuclear Medicine and Medical Imaging

Nyckelord

  • Cerebrovascular circulation
  • Contrast media
  • Hemodynamics
  • Magnetic resonance imaging
  • Magnetometry
  • Oxygen consumption

Aktiv

Published

Forskningsgrupp

  • MR Physics
  • Neuroradiology

ISBN/ISSN/Övrigt

  • ISSN: 2405-8440