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FIG 1. Comparison of BW-constant FIRMS and EP-FIRMS sequences (axial sections).
A and B, Basal ganglia level: FIRMS (A) and EP-FIRMS (B).
C and D, Brain stem level: FIRMS (C) and EP-FIRMS (D).
Although EP-FIRMS has a greater C/N value, subjectively the images are comparable in quality at superior levels (A, B) with minimal geometric distortion. Inferior levels show severe geometric distortion due to the proximity of sphenoidal sinus air, evident at the anterior margin of the pons in the EP-FIRMS image (arrowhead, D), with no artifact in the FIRMS image (C).
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