What is Anisotropy in Ultrasound?
1.5 هزار بار بازدید -
3 سال پیش
-
This video examines anisotropy in
This video examines anisotropy in ultrasound and how to obtain ultrasound images without abnormalities.
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Timestamps:
00:00 - Intro
00:10 - When does anisotropy occur in ultrasound?
00:30 - When is it anisotropy and when is it real?
01:24 - Viewing the anisotropy images in ultrasound
01:48 - Comparing ultrasound of normal tendon images versus anisotropy abnormalities
Anisotropy occurs when the angle of incidence does not equal the angle of refraction. Anisotropy refers to differing ultrasound appearances of structures, depending on what angle the ultrasound beam is insonating the underlying structure. Scanning through the entire structure at various angles is often necessary to ensure that the appearance is indeed an artifact and not a sign of true pathology.
So, when is it anisotropy and when is it real?
As with all ultrasound applications, the abnormality must be proven in two planes at 90 degrees to each other, for example, longitudinal and transverse. You may also need to scan from a different ultrasound window or transducer position. In the video, a tendon is looking anechoic in the left side of the slide. This is because the angle of insonation is not hitting the fibers of the tendon at 90 degrees. If you transition over to the right image in the video, you can see the fibrillar pattern of the tendons. That's because the angle of insonation now is around 90 degrees to those structures. So, the transducer needed to be moved in order to capture that image.
In the image on the left, part of the biceps tendon appears hyperechoic, and almost anechoic in the longitudinal plane here. The anechoic appearance gives the impression that there is no tendon visible. In order to see the true normal tendon echogenicity, tilt the transducer along its long axis to bring the ultrasound beam 90 degrees to the tendon fibers.
Once the beam is intersecting the tendon fibers at 90 degrees, the normal tendon can be seen. In the video, you'll see imaging of the same patient as before on the left, with an incorrect angle of insonation of the biceps tendon, and now a transverse plane, causing anisotropy so that as you can see the tendon disappears and is actually displayed as anechoic. By tilting the transducer slightly cephaladly, the tendon is now visible.
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Learn more about GE Healthcare handheld ultrasound:
United States: https://handheldultrasound.gehealthca...
Europe: https://www.vscan.rocks/
-------------------------------------
Timestamps:
00:00 - Intro
00:10 - When does anisotropy occur in ultrasound?
00:30 - When is it anisotropy and when is it real?
01:24 - Viewing the anisotropy images in ultrasound
01:48 - Comparing ultrasound of normal tendon images versus anisotropy abnormalities
Anisotropy occurs when the angle of incidence does not equal the angle of refraction. Anisotropy refers to differing ultrasound appearances of structures, depending on what angle the ultrasound beam is insonating the underlying structure. Scanning through the entire structure at various angles is often necessary to ensure that the appearance is indeed an artifact and not a sign of true pathology.
So, when is it anisotropy and when is it real?
As with all ultrasound applications, the abnormality must be proven in two planes at 90 degrees to each other, for example, longitudinal and transverse. You may also need to scan from a different ultrasound window or transducer position. In the video, a tendon is looking anechoic in the left side of the slide. This is because the angle of insonation is not hitting the fibers of the tendon at 90 degrees. If you transition over to the right image in the video, you can see the fibrillar pattern of the tendons. That's because the angle of insonation now is around 90 degrees to those structures. So, the transducer needed to be moved in order to capture that image.
In the image on the left, part of the biceps tendon appears hyperechoic, and almost anechoic in the longitudinal plane here. The anechoic appearance gives the impression that there is no tendon visible. In order to see the true normal tendon echogenicity, tilt the transducer along its long axis to bring the ultrasound beam 90 degrees to the tendon fibers.
Once the beam is intersecting the tendon fibers at 90 degrees, the normal tendon can be seen. In the video, you'll see imaging of the same patient as before on the left, with an incorrect angle of insonation of the biceps tendon, and now a transverse plane, causing anisotropy so that as you can see the tendon disappears and is actually displayed as anechoic. By tilting the transducer slightly cephaladly, the tendon is now visible.
-------------------------------------
Learn more about GE Healthcare handheld ultrasound:
United States: https://handheldultrasound.gehealthca...
Europe: https://www.vscan.rocks/
3 سال پیش
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