Dynamic multicoil technique (DYNAMITE) MRI on human brain.

Area of Science:

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

Background:

• Spatial encoding in MRI traditionally relies on linear magnetic field gradients produced by dedicated gradient coils.
• The dynamic multicoil technique (DYNAMITE) was previously developed for B0 field control and validated in preclinical settings.

Purpose of the Study:

• To report the first implementation of DYNAMITE MRI for imaging the in vivo human head.
• To evaluate the image fidelity and performance of DYNAMITE MRI in a human clinical context.

Main Methods:

• A 28-channel multicoil hardware system was utilized to generate gradient fields for DYNAMITE MRI.
• Various MRI sequences, including multislice gradient-echo, multislice spin-echo, and 3D gradient-echo, were acquired on a resolution phantom and in vivo human heads.
• Image quality was assessed and compared against conventional gradient coil technology.

Main Results:

• DYNAMITE MRI achieved average gradient errors of ≤1% across all tested imaging sequences.
• The image quality and sensitivity of DYNAMITE MRI were comparable to conventional gradient coil technology, with no significant artifacts observed.
• Minor peripheral geometric deformations were noted, which are theoretically predictable and correctable.

Conclusions:

• The successful DYNAMITE MRI of the in vivo human head marks a significant advancement.
• This technique offers comparable image fidelity to conventional MRI, supporting its potential for widespread human applications and advanced B0 shim systems.