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Feasibility of simultaneous dual isotope acquisition for myocardial perfusion imaging with a cadmium zinc telluride camera

  • Original Article
  • Published:
Journal of Nuclear Cardiology Aims and scope

Abstract

Background

We studied the impact of technetium-99m (99mTc) in the thallium-201 (201Tl) energy window (70 keV) to determine if CZT cardiac cameras allow us to perform simultaneous dual-isotope acquisition for myocardial perfusion imaging.

Methods

We included 117 consecutive patients. We injected 0.7 MBq/kg of 201Tl at stress, performed the first scan (image T1), then injected at rest 2 MBq/kg of 99mTc-tetrofosmin and immediately acquired a second scan with reconstruction in the energy window of thallium (image T2). A corrected thallium image was created by the subtraction of 99mTc downscattered photons (image TS). We compared spectra, image quality, and semiquantitative scores on T1, T2, and TS images.

Results

Though T2 images were of worse quality, TS images were of equal quality compared to T1 images in most cases. Scores show an underestimation of abnormalities in 20% of patients on T2 images and in 10% on TS images.

Conclusions

Despite the improved energy resolution of CZT cameras, downscatter of technetium in the 201Tl window leads to an underestimation of the pathological territory in 10% to 20% of cases. It does not allow us to use simultaneous dual-isotope acquisition in clinical practice without additional tools for scatter correction.

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Abbreviations

CZT:

Cadmium-Zinc-Telluride

MPI:

Myocardial perfusion imaging

CAD:

Coronary artery disease

SSS:

Summed Stress Score

BMI:

Body Mass Index

ASNC:

American Society of Nuclear Cardiology

SPECT:

Single Photon Emission Computed Tomography

MBq:

Megabecquerels

mCi:

Millicuries

mSv:

Millisievert

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Authors and Affiliations

  1. Nuclear Cardiology, Centre Cardiologique du Nord (CCN), Saint-Denis, Paris, France

    Bernard Songy MD, Mohamed Guernou MD, David Lussato MD, Mathieu Queneau MD, Gerald Bonardel MD, Jean-François Grellier MD, Ludovic Flahaut MSc & Duc Nguyen MD

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  1. Bernard Songy MD
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  2. Mohamed Guernou MD
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  3. David Lussato MD
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  4. Mathieu Queneau MD
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  6. Jean-François Grellier MD
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  7. Ludovic Flahaut MSc
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  8. Duc Nguyen MD
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Correspondence to Bernard Songy MD.

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Songy, B., Guernou, M., Lussato, D. et al. Feasibility of simultaneous dual isotope acquisition for myocardial perfusion imaging with a cadmium zinc telluride camera. J. Nucl. Cardiol. 27, 737–747 (2020). https://doi.org/10.1007/s12350-018-1452-z

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  • DOI: https://doi.org/10.1007/s12350-018-1452-z

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