Which concentration to choose in dual flow cardiac CT?: dual flow cardiac CT

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Diagnostics

Background:

• Functional diagnostics in cardiac imaging require optimal contrast medium protocols.
• Previous studies lacked data on minimal effective contrast medium concentrations.
• The rationale for contrast medium concentration selection in existing protocols is often unclear.

Purpose of the Study:

• To determine the minimal effective concentration of a second contrast medium bolus for reliable cardiac imaging.
• To evaluate the impact of varying contrast medium concentrations on septal delineation, ventricular visualization, and coronary attenuation.

Main Methods:

• Prospective, controlled study involving 40 patients divided into four groups (10%, 20%, 30%, 40% contrast medium).
• Comparison of septal and right ventricular regions of interest (ROIs) using visual scoring.
• Measurement of coronary attenuation in the right and left coronary arteries.
• Assessment of streak artifacts in the right atrium and ventricle.

Main Results:

• Full septal visualization was achieved in 50% of patients with 10% contrast medium, and in all patients with 20% or higher concentrations.
• No significant differences in left ventricular density or coronary artery attenuation were observed across groups.
• Streak artifacts in the right atrium were present in all groups except the 10% contrast medium group.

Conclusions:

• A minimum contrast medium concentration of 20% is recommended for improved septal visualization, crucial for left ventricular functional assessment.
• The tested concentrations did not significantly impact coronary attenuation.
• Reliable visualization of the right ventricle and atrium was not consistently achieved with the dual flow protocol.