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Figure 4


Fig. 1D —In-phase and opposed-phase imaging of fat-water phantoms. Corresponding in-phase and opposed-phase images and 1H MR spectroscopy (MRS) images of three fat-water phantoms placed in water bath; phantoms are composed of 30% (B), 50% (C), or 70% (D) fat. Water peak (short arrow) is 4.7 ppm and fat peak (long arrow) ranges from 1 to 1.5 ppm on MRS images. Example of placement of regions of interest (circles, C) is shown in C. Maximum signal loss on opposed-phase images is seen for phantom with 50% fat (C). Phantoms with 30% (A) and 70% (B) fat are indistinguishable on opposed-phase images. Without MRS to resolve for fat-water dominance, high fat fraction may be misinterpreted as low fat fraction.