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Updated: May 5, 2026
In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
Published on: February 16, 2016
Prognostic value of myocardium perfusion imaging with a new reconstruction algorithm
Ronaldo Lima, Lima Ronaldo1, Andrea De Lorenzo
1Universidade Federal do Rio de Janeiro, Cardiology, Rio de Janeiro, Brazil, ronlima@hotmail.com.
Background:
It has been demonstrated that a new reconstruction algorithm for myocardium perfusion imaging (MPI) allows faster acquisition with similar accuracy. The prognostic value of MPI performed with this software and short acquisition time is unknown.
Methods:
To determine the prognostic value we followed 3184 consecutive MPI patients between March 2008 and March 2010. A 2-day protocol with low dose 99mTc-MIBI (10-12 mCi) and a 6-minute acquisition was used. Exercise stress was used in 62.6% of the studies. Scans were reconstructed using the software "Evolution for cardiac". Perfusion defects were quantified by summed stress score (SSS) and categorized in four groups: SSS0 = 0; SSS1 = 1-3; SSS2 = 4-8; and SSS3 ≥ 9. Patients were phone contacted every 6 months for follow up and hard events were defined as death or myocardial infarction (MI) and total events as hard events plus late revascularization.
Results:
The mean radiation dose was <7 mSv/patient. Mean F/U was 33 ± 20 months; 140 of the patients were lost to follow up and 86 were censored due early revascularization (<60 days after MPS). There were 140 hard events: 89 deaths and 51 MI. Mean age was 61.5 ± 12.3 years and 57.7% were male. Hard event rate was 0.8%/year in patients with normal MPS and 3.7%/year in those with abnormal MPS. Patients with larger defects had nine times more hard events than patients with SSS = 0 (14.2% vs 1.6%). Revascularization was more frequent in patients with abnormal MPS than normal MPS (21.7% vs 3.9%; P < 0.001). Cox proportional hazard analysis showed that SSS was an independent predictor of hard events and revascularization.
Conclusions:
The use of reduced-dose, fast myocardial perfusion SPECT and the new processing algorithm lowers acquisition time and radiation exposure compared to conventional SPECT without compromising the well-established prognostic value of MPI.
Insights
Fast myocardial perfusion imaging (MPI) with reduced radiation dose and a new algorithm maintains its prognostic value. This approach accurately predicts hard events and revascularization in patients.
Area of Science:
- Nuclear Cardiology
- Medical Imaging
- Cardiovascular Disease Prediction
Background:
- A novel reconstruction algorithm enables faster myocardial perfusion imaging (MPI) acquisition with comparable accuracy.
- The prognostic implications of MPI utilizing this rapid acquisition technique remain underexplored.
Purpose of the Study:
- To evaluate the prognostic value of fast MPI with a new processing algorithm.
- To assess the association between perfusion defect size and hard cardiac events.
Main Methods:
- A cohort of 3184 patients underwent 2-day, low-dose (99mTc-MIBI) MPI with 6-minute acquisitions.
- Scans were processed using the "Evolution for cardiac" software; perfusion defects were quantified by summed stress score (SSS).
- Hard events (death, myocardial infarction) and total events (hard events + late revascularization) were tracked over a mean follow-up of 33 months.
Main Results:
- The mean radiation dose was less than 7 mSv.
- Abnormal MPI (SSS > 0) was associated with a significantly higher rate of hard events (3.7%/year vs. 0.8%/year) and revascularization (21.7% vs. 3.9%).
- Summed stress score (SSS) independently predicted hard events and revascularization.
Conclusions:
- Fast MPI with reduced radiation dose and a new algorithm preserves the established prognostic capability of conventional MPI.
- This optimized protocol reduces patient radiation exposure and acquisition time without sacrificing predictive accuracy.
