Blood oxygen level-dependent (BOLD) magnetic resonance imaging in patients with dypiridamole induced ischaemia; a PET comparative study

M. Egred, Gordon David Waiter, Scott Ian Kay Semple, Thomas William Redpath, A. Al-Mohammad, Murdoch Young Norton, M. J. Metcalfe, S. Walton

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Background: Blood oxygen level-dependent (BOLD) MRI relies on changes in deoxyhaemoglobin level in tissues under stress for signal variation and may be used for detection of ischaemic myocardium.

Methods: 15 patients with stress induced myocardial ischaemia on PET scanning underwent rest and dypiridamole stress MRI using a double breath-hold T2*-weighted, ECG gated sequence to produce BOLD contrast images and cine-MRI for wall thickening assessment. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischaemic and non-ischaemic myocardial segments.

Results: Using PET, 156 segments were identified with reversible ischaemia and 324 as non-ischaemic. The ischaemic segments were found on BOLD MRI to have an average signal change between rest and stress of -16.7% compared to -14% in the non-ischaemic segments (p=0.04). The average wall thickening was 7.8 mm in the ischaemic segments compared with 9.5 mm in the non-ischaemic segments (p < 0.0001).

Conclusion: BOLD MRI with wall thickening assessment may differentiate ischaemic from non-ischaemic myocardium in patients with stress induced myocardial ischaemia. Larger studies with improved spatial resolution would help define a threshold for detection of ischaemia as well as determine this technique's sensitivity and specificity. (c) 2006 Elsevier Ireland Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)36-41
Number of pages6
JournalInternational Journal of Cardiology
Volume115
Issue number1
Early online date7 Jul 2006
DOIs
Publication statusPublished - 31 Jan 2007

Keywords

  • bold MRI
  • PET
  • ischaemia
  • perfusion
  • N-13 ammonia
  • myocardium
  • flow
  • MRI
  • dipyridamole
  • stress
  • heart
  • T-2

Cite this

Blood oxygen level-dependent (BOLD) magnetic resonance imaging in patients with dypiridamole induced ischaemia; a PET comparative study. / Egred, M.; Waiter, Gordon David; Semple, Scott Ian Kay; Redpath, Thomas William; Al-Mohammad, A.; Norton, Murdoch Young; Metcalfe, M. J.; Walton, S.

In: International Journal of Cardiology, Vol. 115, No. 1, 31.01.2007, p. 36-41.

Research output: Contribution to journalArticle

Egred, M. ; Waiter, Gordon David ; Semple, Scott Ian Kay ; Redpath, Thomas William ; Al-Mohammad, A. ; Norton, Murdoch Young ; Metcalfe, M. J. ; Walton, S. / Blood oxygen level-dependent (BOLD) magnetic resonance imaging in patients with dypiridamole induced ischaemia; a PET comparative study. In: International Journal of Cardiology. 2007 ; Vol. 115, No. 1. pp. 36-41.
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abstract = "Background: Blood oxygen level-dependent (BOLD) MRI relies on changes in deoxyhaemoglobin level in tissues under stress for signal variation and may be used for detection of ischaemic myocardium.Methods: 15 patients with stress induced myocardial ischaemia on PET scanning underwent rest and dypiridamole stress MRI using a double breath-hold T2*-weighted, ECG gated sequence to produce BOLD contrast images and cine-MRI for wall thickening assessment. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischaemic and non-ischaemic myocardial segments.Results: Using PET, 156 segments were identified with reversible ischaemia and 324 as non-ischaemic. The ischaemic segments were found on BOLD MRI to have an average signal change between rest and stress of -16.7{\%} compared to -14{\%} in the non-ischaemic segments (p=0.04). The average wall thickening was 7.8 mm in the ischaemic segments compared with 9.5 mm in the non-ischaemic segments (p < 0.0001).Conclusion: BOLD MRI with wall thickening assessment may differentiate ischaemic from non-ischaemic myocardium in patients with stress induced myocardial ischaemia. Larger studies with improved spatial resolution would help define a threshold for detection of ischaemia as well as determine this technique's sensitivity and specificity. (c) 2006 Elsevier Ireland Ltd. All rights reserved.",
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AU - Redpath, Thomas William

AU - Al-Mohammad, A.

AU - Norton, Murdoch Young

AU - Metcalfe, M. J.

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N2 - Background: Blood oxygen level-dependent (BOLD) MRI relies on changes in deoxyhaemoglobin level in tissues under stress for signal variation and may be used for detection of ischaemic myocardium.Methods: 15 patients with stress induced myocardial ischaemia on PET scanning underwent rest and dypiridamole stress MRI using a double breath-hold T2*-weighted, ECG gated sequence to produce BOLD contrast images and cine-MRI for wall thickening assessment. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischaemic and non-ischaemic myocardial segments.Results: Using PET, 156 segments were identified with reversible ischaemia and 324 as non-ischaemic. The ischaemic segments were found on BOLD MRI to have an average signal change between rest and stress of -16.7% compared to -14% in the non-ischaemic segments (p=0.04). The average wall thickening was 7.8 mm in the ischaemic segments compared with 9.5 mm in the non-ischaemic segments (p < 0.0001).Conclusion: BOLD MRI with wall thickening assessment may differentiate ischaemic from non-ischaemic myocardium in patients with stress induced myocardial ischaemia. Larger studies with improved spatial resolution would help define a threshold for detection of ischaemia as well as determine this technique's sensitivity and specificity. (c) 2006 Elsevier Ireland Ltd. All rights reserved.

AB - Background: Blood oxygen level-dependent (BOLD) MRI relies on changes in deoxyhaemoglobin level in tissues under stress for signal variation and may be used for detection of ischaemic myocardium.Methods: 15 patients with stress induced myocardial ischaemia on PET scanning underwent rest and dypiridamole stress MRI using a double breath-hold T2*-weighted, ECG gated sequence to produce BOLD contrast images and cine-MRI for wall thickening assessment. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischaemic and non-ischaemic myocardial segments.Results: Using PET, 156 segments were identified with reversible ischaemia and 324 as non-ischaemic. The ischaemic segments were found on BOLD MRI to have an average signal change between rest and stress of -16.7% compared to -14% in the non-ischaemic segments (p=0.04). The average wall thickening was 7.8 mm in the ischaemic segments compared with 9.5 mm in the non-ischaemic segments (p < 0.0001).Conclusion: BOLD MRI with wall thickening assessment may differentiate ischaemic from non-ischaemic myocardium in patients with stress induced myocardial ischaemia. Larger studies with improved spatial resolution would help define a threshold for detection of ischaemia as well as determine this technique's sensitivity and specificity. (c) 2006 Elsevier Ireland Ltd. All rights reserved.

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KW - heart

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