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Automation of gated tomographic left ventricular ejection fraction
K Nichols1, E G DePuey, A Rozanski
1Department of Radiology, St. Luke's-Roosevelt Hospital, New York, NY 10025, USA.
Summary
Automating left ventricular (LV) ejection fraction (EF) measurements using gated single-photon emission computed tomography (GSPECT) provides results comparable to manual methods and other imaging techniques, demonstrating high reproducibility.
Area of Science:
- Nuclear Cardiology
- Medical Imaging Analysis
- Cardiovascular Physiology
Background:
- Left ventricular (LV) ejection fraction (EF) assessment is crucial in cardiology.
- 99mTc-labeled sestamibi gated-tomography (GSPECT) is a validated method for EF determination.
- Observer variability can impact the precision of manual GSPECT EF measurements.
Purpose of the Study:
- To develop and validate an automated method for calculating LV ejection fraction (EF) from GSPECT.
- To improve the precision and reproducibility of GSPECT-based EF measurements.
- To compare automated GSPECT EF with manual GSPECT and other established methods.
Main Methods:
- Automated algorithm developed using observer rules for tomogram processing.
- LV centers identified from activity centroids in time-difference images.
- Endocardial borders generated using harmonic functions and thresholding.
- Comparison with equilibrium gated blood pool and gated first-pass imaging.
Main Results:
- Automated GSPECT EF showed strong correlation with equilibrium gated blood pool (r=0.87) and gated first-pass (r=0.87).
- High interobserver (r=0.92) and intraobserver (r=0.94) reproducibility for automated GSPECT EF.
- Independent observer agreement with automated results ranged from r=0.93 to r=0.96.
Conclusions:
- Automated GSPECT LV EF measurements correlate well with manual GSPECT and other imaging modalities.
- The automated method demonstrates high reproducibility, reducing interobserver variability.
- Automated GSPECT offers a precise and reliable approach for LV EF assessment.