Single PD-FSE Knee MR Image Transformation Into Water, Fat and Field Inhomogeneity Images at 0.5T

Motivation: Lower SNR and closer water-fat spectral peaks at low-filed strength (74Hz at 0.5T) pose challenge to generate essential PDFS contrast in knee MRI. Dixon based methods can be used however, they need multiple MRI images increasing the scan time. Goal(s): Single image knee PDw water image at low field strength. Approach: Knee PD-FSE with shifted echo time MRI image has water and fat signal distributed in complex plane with spatially smooth field inhomogeneity. AI based method was used to solve the ill-posed problem. Results: Retrospective study over 38 patients showed similar knee PDFS MRI performance between Dixon and proposed method. Impact: Proposed method can reduce the acquisition time to obtain fat suppressed MRI at low field strength.