Blood oxygen level-dependent (BOLD) MRI: a novel technique for the assessment of myocardial ischemia as identified by nuclear imaging SPECT

M. Egred, Gordon David Waiter, Thomas William Redpath, Scott Ian Kay Semple, A. Al-Mohammad, Stephen Walton

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Background: The different levels of deoxyhemoglobin in the ischemic myocardium, induced by stressors such as dipyridamole, can be detected by blood oxygen level-dependent (BOLD) MRI and may be used to diagnose myocardial ischemia. The aim of this study was to assess the signal change in the myocardium on BOLD MRI as well as wall thickening between rest and dipyridamole stress images in ischemic and non-ischemic myocardium as identified on SPELT imaging.

Methods: Twelve patients with stress-induced myocardial ischemia on SPELT underwent rest and dipyridamole stress MRI using a double breath-hold, T2*-weighted, ECG-gated sequence to produce BOLD contrast images as well as cine-MRI for wall thickening assessment in 10 of the 12 patients. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischemic and nonischemic myocardial segments as identified on SPELT. In each patient, two MRI slices containing 16 segments per slice were analysed.

Results: In total, there were 384 segments for BOLD analysis and 320 for wall thickening. For BOLD signal 137 segments correlated to segments with reversible ischemia on SPELT and 247 to normal segments, while for wall thickening 112 segments correlated to segments with reversible ischemia and 208 to normal segments. The average BOLD MRI signal intensity change was -13.8 (+/- 16.3)% in the ischemic segments compared to -10.3 (+/- 14.7)% in the non-ischemic segments (p=0.05). The average wall thickening was 6.4 (+/- 3.4) mm in the ischemic segments compared to 8.7 (+/- 3.8) mm in the non-ischemic segments (p < 0.0001).

Conclusion: Stress-induced ischemic myocardium has a different signal change and wall thickening than non-ischemic myocardium and may be differentiated on BOLD MRI. Larger studies are needed to define a threshold for detection and to determine the sensitivity and specificity of this technique. (c) 2007 European Federation of Internal Medicine. Published by Elsevier B.V All rights reserved.

Original languageEnglish
Pages (from-to)581-586
Number of pages6
JournalEuropean Journal of Internal Medicine
Volume18
Issue number8
Early online date31 Aug 2007
DOIs
Publication statusPublished - Dec 2007

Keywords

  • myocardial ischemia
  • SPELT
  • cardiac imaging
  • dipyridamole
  • magnetic resonance imaging
  • blood oxygen level dependent (BOLD) MRI
  • coronary-artery-disease
  • magnetic-resonance
  • perfusion
  • stress
  • T-2

Cite this

Blood oxygen level-dependent (BOLD) MRI : a novel technique for the assessment of myocardial ischemia as identified by nuclear imaging SPECT. / Egred, M.; Waiter, Gordon David; Redpath, Thomas William; Semple, Scott Ian Kay; Al-Mohammad, A.; Walton, Stephen.

In: European Journal of Internal Medicine, Vol. 18, No. 8, 12.2007, p. 581-586.

Research output: Contribution to journalArticle

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title = "Blood oxygen level-dependent (BOLD) MRI: a novel technique for the assessment of myocardial ischemia as identified by nuclear imaging SPECT",
abstract = "Background: The different levels of deoxyhemoglobin in the ischemic myocardium, induced by stressors such as dipyridamole, can be detected by blood oxygen level-dependent (BOLD) MRI and may be used to diagnose myocardial ischemia. The aim of this study was to assess the signal change in the myocardium on BOLD MRI as well as wall thickening between rest and dipyridamole stress images in ischemic and non-ischemic myocardium as identified on SPELT imaging.Methods: Twelve patients with stress-induced myocardial ischemia on SPELT underwent rest and dipyridamole stress MRI using a double breath-hold, T2*-weighted, ECG-gated sequence to produce BOLD contrast images as well as cine-MRI for wall thickening assessment in 10 of the 12 patients. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischemic and nonischemic myocardial segments as identified on SPELT. In each patient, two MRI slices containing 16 segments per slice were analysed.Results: In total, there were 384 segments for BOLD analysis and 320 for wall thickening. For BOLD signal 137 segments correlated to segments with reversible ischemia on SPELT and 247 to normal segments, while for wall thickening 112 segments correlated to segments with reversible ischemia and 208 to normal segments. The average BOLD MRI signal intensity change was -13.8 (+/- 16.3){\%} in the ischemic segments compared to -10.3 (+/- 14.7){\%} in the non-ischemic segments (p=0.05). The average wall thickening was 6.4 (+/- 3.4) mm in the ischemic segments compared to 8.7 (+/- 3.8) mm in the non-ischemic segments (p < 0.0001).Conclusion: Stress-induced ischemic myocardium has a different signal change and wall thickening than non-ischemic myocardium and may be differentiated on BOLD MRI. Larger studies are needed to define a threshold for detection and to determine the sensitivity and specificity of this technique. (c) 2007 European Federation of Internal Medicine. Published by Elsevier B.V All rights reserved.",
keywords = "myocardial ischemia, SPELT, cardiac imaging, dipyridamole, magnetic resonance imaging, blood oxygen level dependent (BOLD) MRI, coronary-artery-disease, magnetic-resonance, perfusion, stress, T-2",
author = "M. Egred and Waiter, {Gordon David} and Redpath, {Thomas William} and Semple, {Scott Ian Kay} and A. Al-Mohammad and Stephen Walton",
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T1 - Blood oxygen level-dependent (BOLD) MRI

T2 - a novel technique for the assessment of myocardial ischemia as identified by nuclear imaging SPECT

AU - Egred, M.

AU - Waiter, Gordon David

AU - Redpath, Thomas William

AU - Semple, Scott Ian Kay

AU - Al-Mohammad, A.

AU - Walton, Stephen

PY - 2007/12

Y1 - 2007/12

N2 - Background: The different levels of deoxyhemoglobin in the ischemic myocardium, induced by stressors such as dipyridamole, can be detected by blood oxygen level-dependent (BOLD) MRI and may be used to diagnose myocardial ischemia. The aim of this study was to assess the signal change in the myocardium on BOLD MRI as well as wall thickening between rest and dipyridamole stress images in ischemic and non-ischemic myocardium as identified on SPELT imaging.Methods: Twelve patients with stress-induced myocardial ischemia on SPELT underwent rest and dipyridamole stress MRI using a double breath-hold, T2*-weighted, ECG-gated sequence to produce BOLD contrast images as well as cine-MRI for wall thickening assessment in 10 of the 12 patients. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischemic and nonischemic myocardial segments as identified on SPELT. In each patient, two MRI slices containing 16 segments per slice were analysed.Results: In total, there were 384 segments for BOLD analysis and 320 for wall thickening. For BOLD signal 137 segments correlated to segments with reversible ischemia on SPELT and 247 to normal segments, while for wall thickening 112 segments correlated to segments with reversible ischemia and 208 to normal segments. The average BOLD MRI signal intensity change was -13.8 (+/- 16.3)% in the ischemic segments compared to -10.3 (+/- 14.7)% in the non-ischemic segments (p=0.05). The average wall thickening was 6.4 (+/- 3.4) mm in the ischemic segments compared to 8.7 (+/- 3.8) mm in the non-ischemic segments (p < 0.0001).Conclusion: Stress-induced ischemic myocardium has a different signal change and wall thickening than non-ischemic myocardium and may be differentiated on BOLD MRI. Larger studies are needed to define a threshold for detection and to determine the sensitivity and specificity of this technique. (c) 2007 European Federation of Internal Medicine. Published by Elsevier B.V All rights reserved.

AB - Background: The different levels of deoxyhemoglobin in the ischemic myocardium, induced by stressors such as dipyridamole, can be detected by blood oxygen level-dependent (BOLD) MRI and may be used to diagnose myocardial ischemia. The aim of this study was to assess the signal change in the myocardium on BOLD MRI as well as wall thickening between rest and dipyridamole stress images in ischemic and non-ischemic myocardium as identified on SPELT imaging.Methods: Twelve patients with stress-induced myocardial ischemia on SPELT underwent rest and dipyridamole stress MRI using a double breath-hold, T2*-weighted, ECG-gated sequence to produce BOLD contrast images as well as cine-MRI for wall thickening assessment in 10 of the 12 patients. Signal change on BOLD MRI and wall thickening were compared between rest and stress images in ischemic and nonischemic myocardial segments as identified on SPELT. In each patient, two MRI slices containing 16 segments per slice were analysed.Results: In total, there were 384 segments for BOLD analysis and 320 for wall thickening. For BOLD signal 137 segments correlated to segments with reversible ischemia on SPELT and 247 to normal segments, while for wall thickening 112 segments correlated to segments with reversible ischemia and 208 to normal segments. The average BOLD MRI signal intensity change was -13.8 (+/- 16.3)% in the ischemic segments compared to -10.3 (+/- 14.7)% in the non-ischemic segments (p=0.05). The average wall thickening was 6.4 (+/- 3.4) mm in the ischemic segments compared to 8.7 (+/- 3.8) mm in the non-ischemic segments (p < 0.0001).Conclusion: Stress-induced ischemic myocardium has a different signal change and wall thickening than non-ischemic myocardium and may be differentiated on BOLD MRI. Larger studies are needed to define a threshold for detection and to determine the sensitivity and specificity of this technique. (c) 2007 European Federation of Internal Medicine. Published by Elsevier B.V All rights reserved.

KW - myocardial ischemia

KW - SPELT

KW - cardiac imaging

KW - dipyridamole

KW - magnetic resonance imaging

KW - blood oxygen level dependent (BOLD) MRI

KW - coronary-artery-disease

KW - magnetic-resonance

KW - perfusion

KW - stress

KW - T-2

U2 - 10.1016/j.ejim.2007.03.013

DO - 10.1016/j.ejim.2007.03.013

M3 - Article

VL - 18

SP - 581

EP - 586

JO - European Journal of Internal Medicine

JF - European Journal of Internal Medicine

SN - 0953-6205

IS - 8

ER -