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. Author manuscript; available in PMC: 2010 Nov 1.
Published in final edited form as: J Magn Reson Imaging. 2009 Nov;30(5):924–932. doi: 10.1002/jmri.21959

Figure 2.

Figure 2

Strategies for reduction of artifacts. (a) Severe susceptibility artifacts are observed at the upper and lower eye lids when the eye is open. (b) With the eye closed and taped and the patient fixating on a target slightly above midline the susceptibility artifact does not degrade the ocular structures of interest (3D-IR-TFE: TR/TE = 6.1/2.4 ms, TI/TS = 2000/1000 ms, 0.25×0.25×1.0 mm3). (c) Head/foot phase encoding gives rise to motion artifacts that are reduced with (d) AP phase encoding (3D-FFE: TR/TE/flip = 8.5/2.7 ms/20°, 0.15×0.25×1.0 mm3). (e) Longer scan times (145 s; 3D-FFE: TR/flip = 40 ms/20°) cause motion artifacts that are reduced with (f) short scan times (30 s; 3D-FFE: TR/flip = 10 ms/20°).