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. 2013 Oct 25;27(6):495–508. doi: 10.7555/JBR.27.20130074

Fig. 1. The top row is MRIs with gray scale density graphs for each of T1, T2 and proton density images.

Fig. 1

The bottom image is a combination of the above images with a gray scale density graph below it. Note the segmentation of tissues in the histogram of the combined image not seen in T1.T2, or PD.