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Fig. 3C —MRI–sonography coregistration images in 65-year-old
woman who presented initially with mass on mammography, confirmed as cyst on
sonography. Coronal T1-weighted 2D fast spoiled gradient-recalled echo MR
image (150/4.2) of same cyst (arrow) as in A and B.
Coordinates of center of cyst (asterisk) were obtained to calculate
expected lesion position on sonography. In addition to lesion identification
on both MRI and sonography, breast parenchymal interfaces on coronal sonograms
and MR images (B) were identified to ensure lesion correlation. Amount
of fat between lesion and skin surface was measured as 11 mm in this case, as
shown, to calculate expected error introduced in z-plane by
differential speed of sound through fat compared with fibroglandular
tissue.
