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Use of a Phase Reference for Field Mapping with Amplitude Images at Low Field

✍ Scribed by D. Tomasi; H. Panepucci; E.L. Vidoto; E.Ribeiro Azevedo

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 841 KB
Volume: 131
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1998.1370

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✦ Synopsis

We present a method to obtain MRI amplitude images that can quences, respectively. The artifact size increases with the picture the magnetic field due to arbitrary shaped magnetized amount of ferromagnetic material but no dependence on the objects. The method employees the gradient recalled echo sequence magnetic field strengths was observed (6). For metals with and two sets of data obtained in separate experiments, one of very low susceptibility, such as diamagnetic cooper (x Ç which provides a phase reference image making it possible to 02 1 10 05 ), the eddy currents are the dominant effect, eliminate the effect of the B 0 field inhomogeneities. The final magwhereas for weakly paramagnetic metals with a slightly nitude images have a good signal-to-noise even at low fields, and larger susceptibility, such as titanium (x Ç 2 1 10 05 ), provide qualitative as well as quantitative information about the both susceptibility and eddy currents artifacts can be obmagnetic field produced by the ferromagnetic object. As an examserved (5). ple the method is applied to study the field produced by a small In this paper we analyze the artifacts induced by weakly metal piece in a 500-G scanner, and the experimental results are compared with numerical simulations. ᭧ 1998 Academic Press ferromagnetic metals ( x Ç 2 1 10 01 ) in GRE sequences.

Here we show that the dephasing effects could be put in evidence more clearly by a special subtraction procedure.

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