Multislice double inversion-recovery black-blood imaging with simultaneous slice reinversion

Area of Science:

• Medical Imaging
• Cardiovascular Imaging
• Magnetic Resonance Imaging

Background:

• Double inversion-recovery (DIR) is crucial for black-blood imaging, suppressing blood signal.
• Standard single-slice DIR is time-consuming for comprehensive imaging.
• Efficient techniques are needed for high-resolution vascular imaging, such as carotid arteries.

Purpose of the Study:

• To develop a time-efficient multislice double inversion-recovery (DIR) technique.
• To evaluate its performance for high-resolution carotid artery imaging.
• To assess its applicability and limitations.

Main Methods:

• Implemented a multislice DIR pulse sequence with fast spin-echo (FSE) readout on a 1.5 T MR scanner.
• Acquired multislice DIR images of carotid arteries with varying numbers of slices per repetition time (N=2-8).
• Compared the technique against standard single-slice DIR and inflow saturation methods.

Main Results:

• Multislice DIR (N=2-6) achieved comparable blood suppression to single-slice DIR in carotid arteries.
• DIR techniques demonstrated superior blood suppression compared to inflow saturation across all tested N values.
• Signal saturation in stationary tissues at N>=6 limited vessel wall visualization.

Conclusions:

• Multislice DIR offers up to an eight-fold improvement in time-efficiency over single-slice DIR.
• The technique provides high-quality blood suppression for carotid artery imaging.
• Limitations regarding stationary tissue signal saturation were identified at higher slice numbers.