Simplified method of determining left ventricular ejection fraction from a radionuclide bolus

Area of Science:

• Nuclear Medicine
• Cardiovascular Imaging
• Medical Physics

Background:

• Left ventricular ejection fraction (LVEF) is a critical indicator of cardiac function.
• Traditional methods for LVEF measurement can be complex or require specialized equipment.
• There is a need for simpler, accessible methods for assessing LVEF.

Purpose of the Study:

• To develop and validate a novel, computer-independent method for measuring LVEF.
• To utilize 99mTc-pertechnetate and gamma camera imaging for LVEF assessment.
• To compare the accuracy of the new method against contrast ventriculography.

Main Methods:

• A bolus of 99mTc-pertechnetate was administered and cardiac chamber passage imaged with a gamma camera.
• Video recordings allowed selection of the left ventricle region of interest at the console.
• Data analysis involved 30ms interval counts, corrected for extra-cardiac activity and filtered for noise.

Main Results:

• The developed method successfully measured LVEF without requiring an online computer.
• Analysis of left ventricular counts, corrected and filtered, provided reliable data.
• LVEF measurements demonstrated excellent agreement with contrast ventriculography (r=0.97, P < 0.001) in 13 patients.

Conclusions:

• A practical, offline method for LVEF measurement using 99mTc-pertechnetate and gamma imaging has been established.
• This technique offers a viable alternative to contrast ventriculography for LVEF assessment.
• The method's accuracy and accessibility make it valuable for cardiac function evaluation.