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Quantitative gated myocardial SPECT: effect of collimation on left-ventricular ejection fraction
M W Groch1, Y Takamiya, P J Groch
1Northwestern University School of Medicine, Chicago, Illinois, USA.
Journal of Nuclear Medicine Technology
|April 14, 2000
Summary
The choice of collimator impacts left-ventricular ejection fraction (LVEF) measurements from gated myocardial perfusion SPECT. While both high-resolution parallel-hole (HRC) and Cardiofocal collimators (CFC) show strong correlations, the CFC yields a higher LVEF value.
Area of Science:
- Nuclear Cardiology
- Medical Imaging Physics
Background:
- Left-ventricular ejection fraction (LVEF) is a critical metric for assessing cardiac function.
- Quantitative algorithms applied to gated myocardial perfusion SPECT (MPS) studies enable LVEF computation.
- Different collimator technologies may influence quantitative SPECT results.
Purpose of the Study:
- To compare the LVEF derived from gated MPS using a conventional high-resolution parallel-hole collimator (HRC) versus a Cardiofocal collimator (CFC).
Main Methods:
- Thirty-four patients underwent 99mTc sestamibi-labeled MPS with both HRC and CFC collimators on a single-head gamma camera.
- Acquisition parameters remained consistent for both collimator types.
- Traditional (TRAD) LVEF was determined via gated blood pool imaging and/or cardiac catheterization for comparison.
Main Results:
- Excellent correlation (r=0.99) was observed between CFC and HRC LVEF.
- Good correlations were found between CFC and TRAD (r=0.95) and HRC and TRAD (r=0.97) LVEF.
- The mean LVEF from CFC (62%) was higher than both HRC (54%) and TRAD (55.4%) LVEF, while HRC LVEF was slightly lower than TRAD.
Conclusions:
- The selection of a collimator for gated MPS significantly influences the resultant LVEF values.
- The Cardiofocal collimator (CFC) may lead to an overestimation of LVEF compared to the high-resolution parallel-hole collimator (HRC) and traditional methods.