Development and Evaluation of a Short-time Imaging Method for the Clinical Study of the Apparent Diffusion...

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Neuroimaging
• Medical Physics

Background:

• The apparent diffusion coefficient subtraction method (ASM) is a restricted diffusion-weighted imaging technique.
• Previous in vitro studies validated ASM, but clinical applications in humans require further investigation.
• Clinical utility necessitates efficient imaging sequences for human subjects.

Purpose of the Study:

• To develop a rapid imaging sequence for ASM of the human head.
• To evaluate the clinical utility of ASM by comparing it with diffusion kurtosis (DK) imaging.
• To report the first ASM images of the human head.

Main Methods:

• Developed a short-time sequence for ASM imaging at 1.5T MRI.
• Scanned two healthy volunteers using the developed sequence.
• Applied median filter processing for noise reduction.
• Assessed the correlation between ASM and DK images.

Main Results:

• The short-time ASM sequence for head imaging was successfully developed and acquired in approximately 3 minutes.
• Median filter processing effectively reduced noise in the acquired ASM images.
• ASM images demonstrated a weak correlation with DK images, confirming their nature as restricted diffusion-weighted images.
• This study presents the first reported ASM images of the human head.

Conclusions:

• A novel, rapid ASM imaging sequence is feasible for clinical application in human head scans.
• The developed sequence provides noise-reduced ASM images suitable for further clinical investigation.
• The findings support the potential use of this short-time ASM sequence in future clinical studies.