Web22. dec 2016 · A low-refocusing-flip-angle three-dimensional (3D) turbo spin-echo (TSE) sequence was modified to acquire both in-phase and out-of-phase echoes, required for chemical shift (Dixon) reconstruction, in the same repetition by using partial echoes combined with modified homodyne reconstruction with phase preservation. WebDual acquisition in each time of repetition is performed, wherein an in phase between CSF and brain tissues is achieved in the first acquisition, while an opposed phase, which is established by a sequence of a long refocusing pulse train with variable flip angles, a composite flip-down restore pulse train, and a short time of delay, is attained ...
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Web1. feb 1997 · The steady state theory is then used to evaluate the performance of low flip angle RARE imaging sequences with both constant and optimally varied refocusing flip angles. The theory is experimentally verified in phantoms and then optimized, single shot, low flip angle RARE is used to obtain artifact… View on Wiley ncbi.nlm.nih.gov Save to … WebPurpose: To evaluate acquisition time and clinical image quality of a variable refocusing flip angle (vrf) single-shot fast spin echo (SSFSE) sequence in comparison with a … gish debate
Optimization of the refocusing flip angle in the characterization of ...
Webecho number for different refocusing flip angles demonstrate that a so-called pseudo steady state (PSS) will be established after an initial phase of echo amplitude oscillations. The PSS is characterized by a constant spin echo amplitude that is given by M 0sin(α/2), if α is the refocusing flip angle (3,4). The WebFor blood suppression, variable refocusing flip angles with flow-sensitizing gradients are employed. To avoid a signal loss resulting from the flow-sensitizing scheme, the first refocusing flip angle is forced to 180°. Composite restore pulses at the end of refocusing pulse train are applied to achieve partial inversion recovery for the T1 ... gish drain