Diagnostic ultrasound ( PDFDrive )

APPENDIX Ultrasound Artifacts: A Virtual Chapter
e5
Click here to see real-time cine clip of showing in region of
cauda equina (Video A.4). 5
Edge shadowing is caused by excessive refraction and commonly
occurs from the edges vessels, cystic structures, and bones.
FIG. A.10 Edge Shadowing. Note the edge shadowing artifact
behind the posterior aspect of the fetal skull. The beam bends at curved
surface and loses intensity, producing a shadow (arrow). 7 (See Chapter
34, Fig. 34.3.)
FIG. A.9 Shadowing. Shadowing from dense plaque prevents
assessment of color low in that region. Note that there must be low
present because similar color is visualized before and after the shadow. 6
(See Chapter 26, Fig. 26.8.)
FIG. A.11 Edge Shadowing 2. Endometrial polyp shows both through
transmission behind the cystic spaces and edge shadowing at the
margins of the cysts. 4 (See Chapter 15, Fig. 15.14B.)