Elliptical field-of-view PROPELLER imaging

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Medical Imaging Physics
• Image Acquisition Techniques

Background:

• Standard MRI scans utilize an isotropic field-of-view (iFOV).
• Imaging elongated objects with iFOV leads to inefficient data acquisition and longer scan times.
• There is a need for optimized MRI acquisition strategies for specific object geometries.

Purpose of the Study:

• To develop and validate an empirical closed-form solution for adapting the PROPELLER MRI trajectory to an elliptical field-of-view (eFOV).
• To enable significant scan time savings when imaging elongated structures.
• To maintain compatibility with existing PROPELLER scan prescription and data reconstruction methods.

Main Methods:

• An empirical closed-form solution was derived to adapt the PROPELLER trajectory for eFOV acquisition.
• The solution leverages the inherent geometry of the PROPELLER trajectory.
• Experimental validation was performed using point spread function (PSF) analysis on phantom scans.

Main Results:

• The proposed method successfully adapted the PROPELLER trajectory for eFOV imaging.
• Experimental validation confirmed the achieved eFOV using PSF measurements.
• Analysis detailed potential scan time reductions and signal-to-noise ratio (SNR) performance compared to iFOV scans for both phantom and in-vivo data.

Conclusions:

• The developed eFOV PROPELLER adaptation offers a practical approach to accelerate MRI acquisition for elongated objects.
• The method demonstrates experimental feasibility and potential for improved imaging efficiency.
• Further evaluation of SNR performance and clinical applicability is warranted.