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Diagnostic ultrasound ( PDFDrive )

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e16

APPENDIX

Ultrasound Artifacts: A Virtual Chapter

A

B

FIG. A.29 Anisotropy. (A) In this long-axis scan of the Achilles insertion on the calcaneus, the proximal portion of the imaged tendon demonstrates

a normal ibrillar appearance (arrow), whereas the distal tendon insertion is hypoechoic (arrowhead). (B) When the transducer is angled 90 degrees

to the distal tendon insertion, the tendon then becomes ibrillar and is normal in appearance (arrowhead). C, Calcaneus. 13 (See Chapter 23,

Fig. 23.8.)

A

B

FIG. A.30 Anisotropy. Short-axis images of the supraspinatus tendon. (A) Artifactual hypoechogenicity of the supraspinatus tendon (arrows)

may simulate tendinosis or tear. (B) Correction of angle of insonation to be perpendicular to the tendon permits visualization of the normal intact

tendon. 15 (See Chapter 24, Fig. 24.30.)

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