T1 and proton density at 7 T in patients with multiple sclerosis: an initial study

Area of Science:

• Neuroimaging
• Radiology
• Medical Physics

Background:

• Detecting cortical lesions in multiple sclerosis (MS) using magnetic resonance imaging (MRI) is challenging due to small lesion size and low contrast.
• Understanding T1 and proton density (PD) of cortical lesions is vital for optimizing MRI sequences for MS research.

Purpose of the Study:

• To determine T1 and PD values for cortical lesions in multiple sclerosis (MS) patients using ultrahigh field MRI.
• To compare white matter and gray matter T1 values between MS patients and healthy controls.

Main Methods:

• Eight MS patients and seven healthy controls underwent 7 Tesla (7T) MRI scans.
• Inversion recovery turbo field echo sequences with varied inversion times were utilized.
• Regions of interest were defined in white matter, gray matter, cortical lesions, white matter lesions, and cerebrospinal fluid.

Main Results:

• White matter and gray matter T1 values were significantly higher in MS patients compared to controls.
• T1 and PD values for cortical and white matter lesions are reported for the first time.
• Ultrahigh field MRI demonstrated advantages for MS research and sequence optimization.

Conclusions:

• Ultrahigh field MRI provides essential quantitative data (T1, PD) for MS cortical lesions.
• This data is critical for advancing MRI sequence development for improved MS lesion detection.
• The findings highlight the potential of 7T MRI in multiple sclerosis research.