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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: Magn Reson Med. 2011 Dec 8;68(3):680–689. doi: 10.1002/mrm.23267

Figure 7.

Figure 7

Axial lower-extremity images of a healthy volunteer: a, b) dual-echo UTE, c, d) dual-band UTE: e, f) IR-UTE. Left column (a, c, e): first-echo images; right column (b, d, f): difference images (first minus second-echo). Contrast between Achilles tendon (thin arrow) and muscle is poor without soft-tissue suppression. Considerable residual fat signal appears in dual-echo UTE (dashed arrow in b)). Soft-tissue suppression is inhomogeneous (dashed arrow in c)) but it is improved when combined with dual-echo UTE (d). IR-UTE creates the highest and most homogeneous tendon contrast. Residual blood signal is visible (dotted arrow in (e)) due to its long T1. The image window levels for echo row images are individually adjusted for better visualization since the image SNRs are substantially different from each other (see Table 2). Signal extraneous to the anatomy is from proton-containing structures of the ankle coil.