Third, is the side-lobe artifact where sidelobe beams are seen at the edges of the transducer element and reflects in a direction different from the main beam (George, 2012). Fourth, the multiple artifacts are seen when the direction of the ultrasound beam is different. Fifth, beamwidth artifacts are seen when echoes of the beam would manifest as though they come from the center (George, 2012). This is seen when the beam goes through fluids. Propagation speed errors are also considered artifacts. These are seen when the media where the beam would penetrate would not propagate at 1540 m/s; as a result, it causes echoes at wrong depths on the displayed image. Acoustic shadowing may be seen when the beam cannot pass through an area “deep to a strongly reflecting or attenuating structure” (George, 2012). Finally, near field clutter can also cause artifacts. This is caused by acoustic noise in the areas of the transducer which then leads to high amplitude oscillations of related elements (George, 2012). These artifacts usually constantly change in appearance and sometimes drift in and out depending on the view. The real structures would often stay constant and can be viewed in different ways.
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