Three‐point dixon technique for true water/fat decomposition with B0 inhomogeneity correction

Magnetic Resonance in Medicine - Tập 18 Số 2 - Trang 371-383 - 1991
Gary H. Glover1, Erika Schneider
1GE Medical Systems Group, Applied Science Laboratory, Milwaukee, Wisconsin 53201.

Tóm tắt

AbstractAn enhancement to Dixon's technique is described which can provide error‐free decomposition of water and fat proton images even in the presence of off‐resonance conditions which result from susceptibility differences, demagnetization, or shim errors. The method uses three measurements with phase shifts of 0, π and − π between the fat and water resonances. The additional information provided by the third measurement is used to calculate an image of the field inhomogeneity in addition to true water and fat images. The signal‐to‐noise ratio (SNR) in the decomposed images is equivalent to that of a 2.7 NEX acquisition (instead of 3 NEX), yielding an SNR imaging efficiency of 95%. In addition, the B0 image which is provided may have diagnostic value in its own right. Examples of head and body scans often portray surprisingly large B0 shifts near interfaces between air or bone and soft tissue. © 1991 Academic Press. Inc.

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Tài liệu tham khảo

10.1148/radiology.153.1.6089263

10.1097/00004728-198408000-00001

10.1097/00004728-198410000-00001

10.1002/mrm.1910020507

10.1016/0022-2364(85)90034-4

10.1088/0031-9155/30/4/008

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Yamamoto E., 1986, IEEE Trans. Med. Imaging, 3, 713

10.1148/radiology.164.2.3602398

10.1016/0730-725X(85)90397-2

G. H.GloverandE.Schneider Magn. Reson. Med. in press.

10.1148/radiology.159.3.3704157

10.1148/radiology.164.2.3602397

10.1097/00004728-198909000-00020

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Thông tin xuất bản

Magnetic Resonance in Medicine

Tập 18 Số 2

371-383

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