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Fig. 4 —Effect of magnetic field strength on size of susceptibility
artifacts in various MR sequences in vitro.
A, Photograph shows phantom setup with water-filled straw
(arrow) embedded in gelatin. Three pairs of surgical clips
(arrowheads) are embedded at various distances from straw.
B, HASTE image acquired at 1.5 T (TR/TE, 1,010/128; field of view,
250 mm2; slice thickness, 2.8 mm; matrix, 256 x 205;
bandwidth, 490 Hz) shows typical susceptibility artifacts caused by surgical
clips.
C, HASTE image acquired at 3.0 T (1,010/128; field of view, 250
mm2; slice thickness, 2.8 mm; matrix, 256 x 205; bandwidth,
490 Hz) shows larger susceptibility artifacts caused by surgical clips when
compared with B.
D, Gradient-echo image acquired at 1.5 T (118/2.4; field of view,
280 x 210 mm2; slice thickness, 3.0 mm; matrix, 256 x
154; bandwidth, 385 Hz) shows typical susceptibility artifacts caused by
surgical clips.
E, Gradient-echo image acquired at 3.0 T (118/2.4; field of view,
280 x 210 mm2; slice thickness, 3.0 mm; matrix, 256 x
154; bandwidth, 385 Hz) shows larger susceptibility artifacts caused by
surgical clips when compared with D. Note that artifact size increases
by approximately 100% in terms of volume.
