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Optimization of Acquisition Time for MRI of Fetal Head: The Eyes Have It

Keyanoosh Hosseinzadeh1,2 and Erma Owens1

1 Diagnostic Imaging, University of Maryland School of Medicine, University of Maryland Medical Center, Baltimore, MD 21201.
2 Present address: Department of Radiology (Abdominal Imaging), UPMC Health Systems (Presbyterian Campus), 200 Lothrop St., Pittsburgh, PA 15213.



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  		Fig. 1A —Ultrafast T2-weighted images obtained coronal to maternal pelvis in 23-year-old woman. Single section containing one fetal orbit is shown. Line of reference (line) is placed with center of axis on orbit (crosshair). Sections are subsequently scrolled through on MRI console with superimposed line of reference.

 


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  		Fig. 1B —Ultrafast T2-weighted images obtained coronal to maternal pelvis in 23-year-old woman. Single section of fetus shows second orbit and line of reference (line). Line of reference is rotated counterclockwise (arrow) about center of axis (crosshair) to cross second orbit at same point (dashed line).

 


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  		Fig. 1C —Ultrafast T2-weighted images obtained coronal to maternal pelvis in 23-year-old woman. Single section of fetal head shows orbit (highlighted) with second orbit (highlighted and arrowhead) superimposed on displayed section to show relative position of both orbits during image scrolling. Rotated line of reference is seen to course through both orbits, which denotes plane of acquisition of subsequent sequence.

 


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  		Fig. 2 —Three-dimensional representation of ultrafast T2-weighted image acquisition coronal to maternal pelvis in 23-year-old woman. Sections containing orbits have been shown and intervening sections have not. Sections have been masked except for fetal heads, which have been highlighted. Three-dimensional representation of line of reference connecting both orbits (line) is displayed. Subsequent sequence yields image containing both orbits symmetrically aligned about midline (asterisk).

 

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