Development of a cardiac evaluation method using a dynamic flat-panel detector (FPD) system: a feasibility study...

Area of Science:

• Medical Imaging
• Cardiovascular Technology
• Radiography

Background:

• Cardiac evaluation traditionally relies on contrast agents and specialized imaging.
• Dynamic imaging with flat-panel detectors (FPDs) offers a novel approach to visualize cardiac motion.

Purpose of the Study:

• To assess the feasibility of using dynamic FPD imaging for cardiac function evaluation.
• To determine if pixel value changes during cardiac pumping correlate with ejection fraction (EF).

Main Methods:

• Acquired sequential radiographs of a cardiac phantom using an FPD system.
• Evaluated varying cardiac outputs and heart rates, with and without contrast medium.
• Measured ventricular area and pixel values, calculating EF and comparing it to CT-derived EF.

Main Results:

• Strong correlations were found between calculated EF and reference values.
• No significant difference in results was observed with or without contrast medium.
• Ejection fraction was underestimated at heart rates above 60 bpm; imaging rates of 7.5-10 fps are recommended.

Conclusions:

• Dynamic FPD imaging can evaluate cardiac function without contrast agents.
• Inter-frame subtraction and color-mapping aid in interpreting pixel value changes as blood flow velocities.
• This technique shows promise for non-invasive cardiac assessment.