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. 2012 May;131(5):3802–3813. doi: 10.1121/1.3699240

Figure 11.

Figure 11

(Color online) Comparison of the CIRS, Inc. phantom image using ultrasound inverse scattering vs. MRI. The ultrasound speed image is on the left and an MRI image of the same phantom is shown at right for comparison. This cross-section of the CIRS, Inc. phantom shows 3 “cysts” and one solid inclusion (12 o’clock – see arrow). The speed of sound of the solid inclusion as determined independently from a sample sent by CIRS, Inc was 1.457 mm/μs at 30C, whereas the estimate from the inverse scattering image (left) was 1.453 mm/μs. The average speed of the 3 “cysts” was determined from an independent sample at 30° to be 1.509 mm/μs, and from the inverse scattering image to be 1.514 mm/μs. The background polyurethane medium had a speed of 1.404 mm/μs as determined from the independent sample from CIRS, and 1.418 from the inverse scattering image. These variations represented from 0.25% to 1% variation in sound speed.