Any sound above audible range (20-20000 hz) is Ultra sound (2-20 mhz).
- Ultrasonography is a diagnostic technique that involves directing high frequency sound waves at tissues in the body to generate images of anatomical structures.
- Anechoic area are regions without internal echoes (black) Cysts, or fluid filled regions like blood, urine etc.
- Hypoechoic-(grey) low signal reflection area are called hypoechoic (soft tissue).
- Hyperechogenic or hyperechoic (bright)- there are many internal echoes.
- Eye is occluded by a dense cataract, Blood in the eye, Suspect foreign body, Mass, or eye protrusion requires to conduct occular ultrasonography.
- In any instances, the US exam can give much information about retina detachments.
For more details please download the attachment- PPT.
