How To Record An Ultrasound Image - Cortexa Technology DermaLab Mini Instructions For Use Manual

6.8 How to record an ultrasound image

Setting the correct Gain
Most importantly, the amplification of the signal should be set correctly. As the focused sound
beam travels through the tissue, it gets attenuated. Since attenuation increases with frequency,
high frequency ultrasound is subject to a high degree of attenuation, which limits the penetration
drastically.
Within certain limits, such attenuation can be compensated for by increasing the amplification (i.e.
gain). In the DermaLab
setting of the gain level.

High gain image, blurred
details.
Press Gain "arrow
down" to lower intensity
level.
A typical gain setting for scanning on the arm is 0 (zero) and for scanning on the temple 4. Scan-
ning on the cheek typically requires a gain of 6 to obtain a good image.
Avoiding Artifacts
The below figure to the left shows an ultrasound image, where gel at the tip of the probe has not
been well distributed. This gives a horizontal shadow in the image because the acoustic ultra-
sound signal does not reach the skin. Such air bubbles will block the signal and cause horizontal
shadows throughout the image.
To prevent this from happening, make sure the outside of the film on the probe is clean and has a
thin layer of well distributed gel or a thin layer of water before making the scan.

Mini, this feature is referred to as gain control, which allows for individual
Normal gain image.
Good intensity level and
distribution, many de-
tails, no Gain adjust-
ment needed.
CORTEX TECHNOLOGY ApS

Low gain image, loss of
details.
Press Gain "arrow up" to
increase intensity.

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