Real time high spatial-temporal resolution flow imaging with spiral MRI using auto-calibrated SENSE

Area of Science:

• Medical Imaging
• Biophysics
• Cardiovascular Science

Background:

• Cardiac gating is typically required for high-resolution blood flow imaging.
• Existing methods face limitations in temporal and spatial resolution for real-time applications.

Purpose of the Study:

• To develop a novel spiral phase contrast (SPC) technique for high temporal and spatial resolution blood flow imaging.
• To eliminate the need for cardiac gating in blood flow measurements.

Main Methods:

• Developed an auto-calibrated spiral sensitivity encoding (SENSE) method for phase contrast (PC) image reconstruction.
• Utilized spiral k-space sampling for enhanced flow properties and acquisition speed.
• Investigated parallel imaging with varying acceleration rates to assess Signal-to-Noise Ratio (SNR) trade-offs.

Main Results:

• Achieved a temporal resolution improvement of at least threefold without cardiac gating.
• Maintained high spatial resolution in flow images of the ascending aorta and aortic valve.
• Demonstrated accurate phase estimation in simulated phantoms and reconstructed under-sampled data from cardiac-gated experiments.

Conclusions:

• The novel SPC technique offers significant improvements in temporal and spatial resolution for blood flow imaging.
• The method shows potential for real-time cardiovascular flow assessment without cardiac gating.
• This advancement facilitates more comprehensive and efficient analysis of blood flow dynamics.