Krypton-enhanced ventilation CT with dual energy technique: experimental study for optimal krypton concentration

Area of Science:

• Medical Imaging
• Pulmonary Function Testing
• Radiology

Background:

• Dual-energy CT (DECT) offers advanced material decomposition capabilities.
• Assessing lung ventilation non-invasively is crucial for diagnosing respiratory diseases.
• Krypton gas has potential as a contrast agent for ventilation imaging.

Purpose of the Study:

• To evaluate the feasibility of krypton-enhanced DECT for ventilation imaging.
• To determine the optimal krypton concentration for DECT ventilation CT.
• To assess the correlation between krypton concentration and imaging enhancement.

Main Methods:

• DECT was performed on rabbits at various krypton concentrations (20-70%).
• Krypton extraction and visualization were done using a workstation with color maps.
• Overlay Hounsfield Unit (HU) values and visual homogeneity were analyzed.

Main Results:

• A significant positive correlation was found between overlay HU values and krypton concentration (P < .001).
• Mean overlay HU values increased with higher krypton concentrations, reaching 18.79 ± 3.63 at 70%.
• Universal enhancement was observed on krypton color maps at 70% concentration across all animals.

Conclusions:

• Krypton-enhanced DECT is a feasible technique for evaluating lung ventilation.
• A minimum krypton concentration of 70% is recommended for effective DECT ventilation imaging.
• This method shows promise for non-invasive assessment of pulmonary ventilation.