Regional corpus callosum morphometry: effect of field strength and pulse sequence

Area of Science:

• Neuroimaging
• Radiology
• Anatomy

Background:

• Corpus callosum (CC) morphometry is crucial for understanding brain development and neurological disorders.
• Variations in magnetic resonance imaging (MRI) scanning parameters, such as field strength and pulse sequences, can influence image contrast and potentially affect morphometric measurements.
• Ensuring reproducibility of CC measurements across different scanning protocols is essential for reliable research and clinical applications.

Purpose of the Study:

• To determine if different MRI field strengths (1.5T and 3T) and pulse sequences (MPRAGE and MDEFT) impact the reproducibility of corpus callosum (CC) morphometric measurements.
• To investigate whether variations in scanning physics, independent of tissue properties, introduce variability in CC morphometric data.

Main Methods:

• Ten healthy subjects underwent MRI scans using specific protocols: twice at 3T (MPRAGE and MDEFT) and once at 1.5T (MPRAGE).
• Cross-sectional areas of four distinct regions within the corpus callosum were measured on midsagittal MRI slices.
• Statistical analysis, including repeated measures ANOVA, was used to assess the interaction between scanning protocols and callosal regions.

Main Results:

• No significant interaction was found between scanning protocols and the four callosal regions (F(6,54) = 0.69, P = 0.52), indicating consistency across protocols.
• High reliability measures (0.90–0.97) were observed when comparing different scanning protocols, including 3T MPRAGE/3T MDEFT and 1.5T MPRAGE/3T comparisons.

Conclusions:

• Corpus callosum (CC) morphometric data acquired using different field strengths and pulse sequences are comparable and reproducible.
• Combining and comparing CC morphometric data across varying MRI acquisition parameters is feasible, supporting broader data integration in research.