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Published on: February 16, 2016
Hybrid Assessment of Myocardial Ischemia Using Stress-Only Nuclear Myocardial Perfusion Imaging and Rest Computed
Yasuyuki Suzuki1, Naoya Matsumoto1, Ayano Makita1
1Department of Cardiology, Nihon University Hospital.
Insights
Hybrid myocardial perfusion imaging (MPI) offers accurate detection of coronary artery disease (CAD) while significantly reducing radiation dose compared to standard sequential assessments. This approach combines CT coronary angiography and nuclear MPI effectively.
Area of Science:
- Cardiovascular Imaging
- Radiology
- Nuclear Medicine
Background:
- Sequential CT coronary angiography (coronary CT) and nuclear myocardial perfusion imaging (MPI) assess coronary artery disease (CAD) but carry radiation risks.
- Hybrid MPI, integrating stress-only nuclear MPI with rest CT-MPI, aims to lower radiation exposure.
- This study compares the diagnostic performance and radiation dose of hybrid MPI versus sequential assessment.
Purpose of the Study:
- To evaluate the diagnostic performance of hybrid MPI for detecting significant CAD.
- To compare the total radiation dose between hybrid MPI and sequential CT-MPI assessment.
- To determine if hybrid MPI maintains diagnostic accuracy while reducing radiation exposure.
Main Methods:
- Analyzed data from 101 patients who underwent coronary CT, nuclear MPI, and invasive coronary angiography.
- Calculated summed difference scores (SDS) from standard and hybrid MPI to identify myocardial ischemia.
- Utilized receiver-operating characteristic (ROC) curve analysis to assess diagnostic performance and compared total radiation doses.
Main Results:
- Diagnostic performance, measured by the area under the ROC curve, was comparable between standard SDS and hybrid SDS (0.901 vs. 0.815, P=0.079).
- Hybrid MPI significantly reduced the total radiation dose compared to standard nuclear MPI with CT angiography (4.62 mSv vs. 9.72 mSv, P<0.0001).
- The study included 101 patients with recent imaging and invasive coronary angiography.
Conclusions:
- Hybrid MPI demonstrates precise diagnostic accuracy for detecting significant CAD.
- This hybrid approach offers a valuable method for reducing radiation dose in CAD assessment.
Background:
Sequential assessment using CT coronary angiography (coronary CT) and nuclear myocardial perfusion imaging (MPI) is considered an anatomical and functional evaluation of coronary artery disease (CAD). However, there can be unexpected radiation exposure. Hybrid MPI with stress-only nuclear MPI and rest CT-MPI using coronary CT may contribute to reducing the radiation dose in sequential assessment with nuclear MPI after coronary CT. We analyzed the diagnostic performance and total radiation dose of hybrid MPI for detection of significant CAD compared with sequential assessment using nuclear MPI after coronary CT.
Methods And Results:
The results for 101 patients who underwent coronary CT, nuclear MPI and invasive coronary angiography within 3 months of all imaging were analyzed. We calculated the summed difference score (SDS) from standard nuclear MPI and hybrid SDS from hybrid MPI, which revealed myocardial ischemia. The diagnostic performance of SDS and hybrid SDS for detecting significant CAD was analyzed using receiver-operating characteristic (ROC) curve analysis. We also compared the total radiation dose of both methods. The area under the ROC curve was not different between SDS and hybrid SDS (0.901 and 0.815, P=0.079). Total radiation dose of hybrid MPI was significantly lower than standard nuclear MPI with CT angiography (4.62 mSv vs. 9.72 mSv, P<0.0001).
Conclusions:
Hybrid MPI showed a precise diagnostic accuracy for significant CAD detection.
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