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Experimental images of the brain in a fetal phantom produced with the rotating arm system demonstrate improved resolution and detectability metrics, given in Table II. (a) Single position fully-sampled synthetic aperture image. The dotted line indicates a region of interest inside the anechoic region and the dashed lines indicate regions in the surrounding tissue. (b) Swept synthetic aperture image over a span of 41.6 degrees. The displayed dynamic range is 60 dB.
