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Left ventricular volumes by gated equilibrium radionuclide angiography: a new method
Circulation
|September 1, 1979
Summary
This study demonstrates a radionuclide method for accurately estimating left ventricular volumes. Normalizing counts per milliliter of plasma yielded the best correlation with angiographic measurements, offering a reliable alternative.
Area of Science:
- Nuclear Medicine
- Cardiovascular Imaging
- Medical Physics
Background:
- Accurate measurement of left ventricular (LV) volumes is crucial for diagnosing and managing cardiac diseases.
- Traditional methods like contrast angiography have limitations, including invasiveness and potential for artifact.
Purpose of the Study:
- To compare radionuclide-derived end-diastolic volume (EDV) and end-systolic volume (ESV) with angiographic volumes.
- To develop and validate a non-geometric radionuclide method for LV volume estimation.
Main Methods:
- Equilibrium radionuclide angiography (ERNA) using 99mTc-human serum albumin in 52 patients.
- Time-activity curves generated by dividing RR intervals into frames.
- Normalization of counts by dose/body surface area, plasma volume, and counts/ml of plasma.
- Validation using a cardiac phantom.
Main Results:
- Good correlations (r > 0.84) with normalization for dose/body surface area and plasma volume in 35 patients.
- Excellent correlation (r = 0.98) with normalization for counts/ml of plasma in 17 patients.
- Phantom studies showed high correlation (r = 0.99) and low standard error of the estimate (SEE).
Conclusions:
- A radionuclide method, particularly with normalization for counts/ml of plasma, accurately estimates left ventricular volumes.
- This method is independent of geometric assumptions, offering a valuable non-invasive alternative to angiography.