Abstract
Background
We studied the impact of simultaneous dual-isotope acquisition on 123I/99mTc mismatch assessment using two CZT cameras (DNM 530c, GE Healthcare and DSPECT, Biosensors International).
Methods
We used an anthropomorphic torso phantom (respectively filled with a solution of 123I alone, 99mTc alone, and a mixture of 123I and 99mTc) and its cardiac insert with two defects mimicking two matched and mismatched defects. Mismatch extent and reconstructed image contrast were evaluated.
Results
The acquisition mode (single vs dual) significantly impacted (i) 99mTc (but not 123I) reconstructed segmental activities using both camera (P < .001), and (ii) image contrast (using 123I and DNM 530c, P < .0001; and using both 123I and 99mTc with DSPECT, P < .0001). However, the defect and mismatch size were not impacted by the type of acquisition. With both DNM 530c and DSPECT, Lin’s concordance correlation coefficient and Bland–Altman analysis demonstrated an almost perfect concordance and agreement between single- and simultaneous dual-isotope segmental activity (123I and 99mTc).
Conclusions
This study found no impact of the acquisition mode (single vs dual) or the type of camera (DSPECT vs DNM 530c) on 123I and 99mTc defect size and mismatch, providing a new step toward simultaneous dual-isotope acquisition for combined innervation and perfusion assessment.
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Abbreviations
- 123I-mIBG:
-
123I-meta-iodobenzylguanidine
- CCC:
-
Concordance correlation coefficient
- CZT:
-
Cadmium-zinc-telluride
- kCnts:
-
Kilo-counts
- ROI:
-
Region of interest
- VOI:
-
Volume of interest
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Acknowledgment
Nathaniel Roth, Rafael Baavour, Sylvie Petit, Mathilde Thélu, and the nuclear medicine technicians at Caen and Lille for their technical assistance.
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The authors have indicated that they have no financial conflict of interest.
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Blaire, T., Bailliez, A., Ben Bouallegue, F. et al. First assessment of simultaneous dual isotope (123I/99mTc) cardiac SPECT on two different CZT cameras: A phantom study. J. Nucl. Cardiol. 25, 1692–1704 (2018). https://doi.org/10.1007/s12350-017-0841-z
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DOI: https://doi.org/10.1007/s12350-017-0841-z