Rapid comprehensive evaluation of luminography and hemodynamic function with 3D radially undersampled phase contrast...

Area of Science:

• Medical Imaging
• Cardiovascular Imaging
• Magnetic Resonance Imaging

Background:

• Quantitative flow MRI is valuable but clinically limited by long scan times.
• Three-dimensional (3D) angular undersampled acquisitions offer potential scan time reduction.
• High spatial resolution is needed for hemodynamic analysis in small vessels.

Purpose of the Study:

• To evaluate a novel 3D angular undersampled MR acquisition for rapid quantitative flow measurements.
• To assess the feasibility of this technique for hemodynamic analysis in small vessels.
• To compare the technique with invasive measurements and contrast-enhanced MRA.

Main Methods:

• Utilized 3D angular undersampled MR acquisitions for data reconstruction.
• Performed quantitative flow measurements with volumetric coverage and three-directional flow encoding.
• Conducted animal studies for transstenotic pressure gradient measurements and human studies for lumen measurements.

Main Results:

• The novel MR acquisition scheme significantly reduced scan times while maintaining tolerable image quality.
• Transstenotic pressure gradients from the novel scheme favorably correlated with invasive measurements in an animal model (r=0.977).
• Human studies showed suitability for lumen measurements, offering an alternative to contrast-enhanced MRA.

Conclusions:

• Rapid 3D angular undersampled MR acquisitions are feasible for quantitative flow measurements.
• This technique provides high spatial resolution for non-invasive hemodynamic analysis in small vessels.
• The method serves as a viable alternative to contrast-enhanced MRA, reducing risks associated with contrast agents.