![]() Both simulated and experimental results demonstrate that our proposed method is more reliable and robust than traditional algorithms at obtaining correct phase maps, especially in regions of low‐signal and air cavities, such as the abdomen and pelvis. Simulations of various phase wrapped situations were performed and this new method was also used for an in vivo application (i.e., MRI automatic global shimming). In this study, an alternative and novel three dimensional phase unwrapping strategy is introduced. Numerous MRI phase unwrapping strategies were developed in the past using a criterion based on phase information of local or neighboring voxels. The original phase is estimated by analyzing the derivative of the wrapped phase image. MRI phase data often suffers from phase wrapping (i.e., phase may be discontinuous by 2 jumps). This method considers the global character of the phase distribution and utilizes continuous trigonometric functions to construct an expected phase map as an unwrapping reference, which is then used to guide the phase correction of every individual voxel. ![]() MRI phase data often suffers from phase wrapping (i.e., phase may be discontinuous by 2π jumps). Liu, Wentao Tang, Xin Ma, Yajun Gao, Jia‐Hong ![]() 3D phase unwrapping using global expected phase as a reference: Application to MRI global shimming 3D phase unwrapping using global expected phase as a reference: Application to MRI global shimming
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