[Overview of cardiac contrast examination using 64-row multislice CT]

Area of Science:

• Radiology
• Cardiovascular Imaging
• Medical Imaging Technology

Background:

• ECG-gated multislice CT (MSCT) enables functional cardiac diagnosis.
• Accurate depiction of endocardial and epicardial contours is crucial for cardiac motion analysis.
• Current methods require optimization for enhanced functional assessment.

Purpose of the Study:

• To evaluate simultaneous contrast medium and saline injection techniques for cardiac CT.
• To compare multi-stage injection, cross injection, and a novel trapezoidal cross-injection method.
• To assess the relationship between patient body weight and contrast medium volume for each method.

Main Methods:

• Simultaneous injection of contrast medium and saline with varying concentrations.
• Implementation of multi-stage injection, continuous cross injection, and trapezoidal cross injection.
• Analysis of myocardial CT values, region extraction efficacy, and correlation with body weight.

Main Results:

• Cross-injection showed minimal myocardial CT value differences between heart chambers, aiding automatic region extraction.
• Trapezoidal cross-injection yielded high CT values.
• All methods showed a negative correlation between body weight and contrast volume; trapezoidal cross-injection exhibited the strongest correlation (r=0.8).

Conclusions:

• Trapezoidal cross-injection is an effective method for cardiac CT, offering high CT values and improved accuracy.
• This technique enhances automatic region extraction of cardiac chambers and myocardium.
• The strong correlation with body weight aids in optimizing contrast medium usage.