Fast spin-echo triple-echo dixon (fTED) technique for efficient T2-weighted water and fat imaging

Area of Science:

• Magnetic Resonance Imaging (MRI)
• Medical Physics

Background:

• Conventional fast spin-echo (FSE) Dixon methods for water and fat separation require multiple scans, leading to prolonged examination times.
• Increasing echo spacing (esp) in FSE is often necessary for adequate water-fat phase shift, potentially degrading image quality and scan efficiency.

Purpose of the Study:

• To develop and implement a novel FSE triple-echo Dixon (fTED) technique for simultaneous water and fat separation.
• To overcome the limitations of speed and scan parameter compromises in existing FSE Dixon methods.

Main Methods:

• A new fTED technique acquires three raw images within a single FSE scan by modifying frequency-encoding gradients.
• Alternating polarity gradients and adjusted receiver bandwidth (RBW) achieve specific phase shifts (-180°, 0°, 180°) for water and fat signals across the three echoes.
• An automated postprocessing algorithm generates separate water-only and fat-only images.

Main Results:

• The fTED technique enables uniform water and fat separation in a single scan.
• Fast scanning is achieved with uncompromised FSE parameters.
• The method is effective with and without parallel imaging, suitable for applications like T2-weighted abdominal imaging during breath-holding.

Conclusions:

• The novel fTED technique offers a faster and more efficient approach to water and fat separation in MRI.
• This method maintains image quality and scan efficiency, broadening its clinical applicability, particularly for dynamic imaging scenarios.