[Evaluation of cardiac function with 32DAS MDCT--fundamental examination]

Area of Science:

• Cardiovascular Imaging
• Medical Physics

Background:

• Accurate assessment of cardiac function, particularly ejection fraction (EF), is crucial for diagnosing and managing cardiovascular diseases.
• Computed tomography (CT) offers a non-invasive method for cardiac imaging, but its accuracy in quantifying EF requires validation against established techniques.

Purpose of the Study:

• To investigate the influence of varying imaging parameters on ejection fraction (EF) measurements using 32-detector row multi-slice CT (MDCT).
• To compare EF values derived from coronary CT angiography (CCTA) with those obtained from left ventriculography (LVG) in a clinical setting.

Main Methods:

• Cardiac phantom studies were conducted with manipulated pulse counts, X-ray tube revolving speed, image reconstruction modes, and beam pitch.
• Clinical data from four patients who underwent both CCTA and LVG were analyzed for comparative EF assessment.

Main Results:

• Phantom image analysis revealed that coronary CT-derived EF values were generally smaller than LVG-derived values.
• End-diastolic volume (EDV) and end-systolic volume (ESV) measured by coronary CT were smaller than those measured by LVG.
• Conversely, EF values measured by coronary CT were found to be larger than those measured by LVG in some evaluations, with a maximal difference of approximately 10% relative to LVG values.

Conclusions:

• Image acquisition conditions significantly affect the calculated ejection fraction (EF) values in cardiac CT.
• While coronary CT provides valuable functional information, discrepancies exist compared to LVG, necessitating careful consideration of imaging protocols and potential biases in EF quantification.