Evaluating image quality on post-mortem cardiac CT using an anthropomorphic phantom.

Area of Science:

• Medical Imaging
• Cardiovascular Imaging

Background:

• Ischemic heart disease is a leading global cause of mortality.
• Coronary computed tomography angiography (CCTA) is crucial for diagnosing atherosclerotic plaques.
• Post-mortem imaging is utilized to assess CT scanner advancements.

Purpose of the Study:

• To compare CCTA image quality of post-mortem hearts scanned within an anthropomorphic phantom versus directly on a scanner bed.
• To determine which post-mortem scanning method best approximates in-vivo CCTA imaging.

Main Methods:

• Ten post-mortem hearts underwent CCTA scanning using two methods: within a phantom and directly on the scanner bed.
• Ten in-vivo CCTA scans were included for comparison.
• Region of interest (ROI) measurements, plaque burden, and composition were analyzed; visual image quality was also assessed.

Main Results:

• Significant differences were found in ROI measurements between the two post-mortem methods and between post-mortem methods and in-vivo scans.
• Four out of five plaque measurements showed significant differences.
• Phantom scans, while noisier, provided clearer plaque visualization and were more similar to in-vivo images.

Conclusions:

• Scanning post-mortem hearts within an anthropomorphic phantom yields significantly different image quality compared to scanning directly on the scanner bed.
• Phantom-based scanning demonstrates greater comparability to in-vivo scans.
• Appropriate scanning techniques are essential for accurate post-mortem organ imaging.