Abstract：
:Fast gradient echo sequences, such as echo planer imaging (EPI) and spiral imaging, are vulnerable to artifacts resulting from B(0) inhomogeneities. A major contribution to these artifacts is the susceptibility variation across the head, which is most severe in regions adjacent to air-tissue interfaces, such as the mouth, nasal sinuses, ears and the cortex. Susceptibility artifacts can cause geometrical distortions in the image as well as loss of signal due to T(2)* dephasing. The extent of these artifacts increases with the main field, thus compromising the signal-to-noise ratio (SNR) benefit gained in higher fields. In the current work, inhomogeneity caused by susceptibility variations at the external boundary of the human body has been corrected by surrounding the organs with a liquid without hydrogen atoms and whose susceptibility is similar to that of the imaged organ. EPI experiments were conducted on head-sized phantom, human brain, hand and legs. This method causes minimal patient inconvenience and no interference with any function of the scanner, thus yielding a simple and efficient solution for the correction of B(0) variation.
journal_name
Magn Reson Imagingjournal_title
Magnetic resonance imagingauthors
Neufeld A,Assaf Y,Graif M,Hendler T,Navon Gdoi
10.1016/j.mri.2005.07.011subject
Has Abstractpub_date
2005-11-01 00:00:00pages
947-51issue
9eissn
0730-725Xissn
1873-5894pii
S0730-725X(05)00229-8journal_volume
23pub_type
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