Quantitative multi-parameter mapping of R1, PD(*), MT, and R2(*) at 3T: a multi-center validation

Area of Science:

• Neuroimaging
• Medical Physics
• Radiology

Background:

• Multi-center magnetic resonance imaging (MRI) studies are vital for rare diseases and population variance.
• Data comparability across sites and time is crucial for MRI study reliability.
• Inter-site comparability of conventional T1-weighted MRI data remains a challenge.

Purpose of the Study:

• To validate quantitative multi-parameter mapping (MPM) for comparable, multi-center MRI studies.
• To assess the inter-site bias and variability of MPM-derived quantitative parameters.
• To compare the reproducibility of gray matter maps derived from MPM versus conventional T1-weighted images.

Main Methods:

• Quantitative multi-parameter mapping (MPM) was used to generate 1 mm high-resolution maps.
• Maps included longitudinal relaxation rate (R1), effective proton density (PD(*)), magnetization transfer saturation (MT), and effective transverse relaxation rate (R2(*)).
• Five volunteers were scanned at three different sites at 3T to determine inter-site bias and coefficient of variation (CoV).

Main Results:

• MPM demonstrated low inter-site bias (<3.1%) and CoV (<8%) for most parameters.
• The inter-site CoV for R2(*) was an exception, at less than 20%.
• Gray matter probability maps from MT parameter maps showed 14% higher inter-site reproducibility than those from conventional T1-weighted images.

Conclusions:

• MPM provides highly comparable quantitative MRI parameter maps across sites and time points.
• MPM is a reliable and efficient tool for multi-center neuroimaging studies.
• MPM offers high resolution and detailed brain microstructure insights, enhancing study sensitivity and reliability.