Speed Displacement and Refraction Artifact

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We had a good read. For the benefit of yourself. Be sure to read to the end. I want you to get good knowledge from Sonography Degree . Speed Displacement and Refraction Artifact The speed of sound within a material is dependent on its density and elastic properties. Ultrasound image processing assumes a constant speed of sound in human tissue of 1540 m/sec. In clinical sonography, the ultrasound beam may encounter a variety of materials such as air, fluid, fat, soft tissue, and bone. When sound travels through material with a velocity significantly slower than the assumed 1540 m/sec, the returning echo will take longer to return to the transducer. The image processor assumes that the length of time for a single round trip of an echo is related only to the distance traveled by the echo. The echoes are thus displayed deeper on the image or further lateral than they really are. This is referred to as the speed displacement artifact; in clinical imaging, it is often recognized when the ultrasound beam encounters an area of focal fat such as perirenal fatty tissue in this case. A change in velocity of the ultrasound beam as it travels through two adjacent tissues with different density and elastic properties may produce a refraction artifact. In refraction, nonperpendicular incident ultrasound energy encounters an interface between two materials with different speeds of sound. When this occurs, the incident ultrasound beam changes direction. The degree of this change in direction is dependent on both the angle of the incident ultrasound beam and the difference in velocity between the two media. The ultrasound ...

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