CZT-MPI demonstrated higher diagnostic sensitivity (87.5% vs 62.5%) but significantly lower specificity (40% vs 100%) compared to conventional Anger-MPI for detecting coronary artery disease.
Cross-Sectional (n=83)
Blinded readers
Yes
Does CZT-MPI improve diagnostic accuracy, image quality, and inter-rater reproducibility compared to conventional SPECT in patients undergoing myocardial perfusion imaging?
CZT-MPI offers higher sensitivity and better image quality than conventional SPECT but has lower specificity, requiring specialized reader training.
Absolute Event Rate: 87.5% vs 62.5%
p-value: p=<0.05
BACKGROUND: Cadmium-zinc-telluride (CZT)-based detectors exhibit higher diagnostic sensitivity in myocardial perfusion imaging (MPI) than conventional Anger-MPI for detection of coronary artery disease (CAD); however, reduced specificity and diagnostic accuracy of CZT-MPI were observed. This study aims to compare these different camera systems and to examine the degree of inter-rater reproducibility among readers with varying experience in MPI. METHODS: 83 patients who underwent double stress/rest examinations using both a CZT and conventional SPECT cameras within one visit were included. Anonymized and randomized MPI-images were distributed to 15 international readers using a standardized questionnaire. Subsequent coronary angiography findings of ten patients served as a reference for analysis of sensitivity and specificity. RESULTS: Image quality was significantly better in CZT-MPI with significantly lower breast attenuation (P < 0.05). CZT-MPI exhibited higher sensitivity than Anger-MPI (87.5% vs. 62.5%) and significantly reduced specificity (40% vs. 100%). Readers experienced with both camera systems had the highest inter-rater agreement indicating higher reproducibility (CZT 0.54 vs. conv. 0.49, P < 0.05). CONCLUSIONS: Higher diagnostic sensitivity of CZT-MPI offers advantages in detection of CAD yet potentially of at the cost of reduced specificity, therefore it requires special training and a differentiated evaluation approach, especially for non-experienced readers with such camera systems.
Mansour et al. (Thu,) conducted a cross-sectional in Coronary artery disease (n=83). CZT-MPI (D-SPECT) vs. Conventional Anger-MPI was evaluated on Diagnostic sensitivity for coronary artery disease (p=<0.05). CZT-MPI demonstrated higher diagnostic sensitivity (87.5% vs 62.5%) but significantly lower specificity (40% vs 100%) compared to conventional Anger-MPI for detecting coronary artery disease.