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Agreement and disagreement between contrast-enhanced magnetic resonance imaging and nuclear imaging for assessment of myocardial viability

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European Journal of Nuclear Medicine and Molecular Imaging Aims and scope Submit manuscript

Abstract

Purpose

The purpose of this study was to compare contrast-enhanced MRI and nuclear imaging with 99mTc-tetrofosmin and 18F-fluorodeoxyglucose (18F-FDG) single photon emission computed tomography (SPECT) for assessment of myocardial viability.

Methods

Included in the study were 60 patients with severe ischaemic left ventricular (LV) dysfunction who underwent contrast-enhanced MRI, 99mTc-tetrofosmin and 18F-FDG SPECT. Myocardial segments were assigned a wall motion score from 0 (normokinesia) to 4 (dyskinesia) and a scar score from 0 (no scar) to 4 (76–100% transmural extent). Furthermore, 99mTc-tetrofosmin and 18F-FDG segmental tracer uptake was categorized from 0 (tracer activity >75%) to 3 (tracer activity <25%). Dysfunctional segments were classified into viability patterns on SPECT: normal perfusion/18F-FDG uptake, perfusion/18F-FDG mismatch, and mild or severe perfusion/18F-FDG match.

Results

Minimal scar tissue was observed on contrast-enhanced MRI (scar score 0.4±0.8) in segments with normal perfusion/18F-FDG uptake, whereas extensive scar tissue (scar score 3.1±1.0) was noted in segments with severe perfusion/18F-FDG match (p < 0.001). High agreement (91%) for viability assessment between contrast-enhanced MRI and nuclear imaging was observed in segments without scar tissue on contrast-enhanced MRI as well as in segments with transmural scar tissue (83%). Of interest, disagreement was observed in segments with subendocardial scar tissue on contrast-enhanced MRI.

Conclusion

Agreement between contrast-enhanced MRI and nuclear imaging for assessment of viability was high in segments without scar tissue and in segments with transmural scar tissue on contrast-enhanced MRI. However, evident disagreement was observed in segments with subendocardial scar tissue on contrast-enhanced MRI, illustrating that the nonenhanced epicardial rim can contain either normal or ischaemically jeopardized myocardium.

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Correspondence to Stijntje D. Roes.

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Roes, S.D., Kaandorp, T.A.M., Ajmone Marsan, N. et al. Agreement and disagreement between contrast-enhanced magnetic resonance imaging and nuclear imaging for assessment of myocardial viability. Eur J Nucl Med Mol Imaging 36, 594–601 (2009). https://doi.org/10.1007/s00259-008-1001-0

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  • DOI: https://doi.org/10.1007/s00259-008-1001-0

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