Ultrasound – Operating principle

The sonography (or ultrasound examination) is a method for the pictorial representation of different body regions with ultrasound waves in the non-audible area. These are mechanical oscillations with frequencies between 1 and 12 MHz. The ultrasonic waves emitted by a transducer are absorbed or reflected in the body depending on the tissue. The sound head then recovers the reflected sound waves so that it serves as a transmitter and receiver alternately. The reflected sound waves are converted into electrical impulses, amplified with the ultrasonic device and displayed on a screen. This creates two-dimensional images that convey a spatial idea of the size, shape and structure of the examined organs and soft tissue. Ultrasonic technology works well wherever there are many soft parts and no bones are in the way.

Ultrasound – Application Possibilities

The sonography is used in many areas of medicine for first-time diagnosis as well as for the progress control of diseases. Our range of services includes the following areas:
  • Abdominal:
    With the ultrasound examination of the abdominal cavity, the liver, gallbladder, spleen, pancreas, kidneys, lymph nodes and vessels can be depicted.
  • thyroid sonography:
    Thyroid ultrasound can be used to depict cysts, tumors, inflammatory changes and organ enlargements (goiter, colloquially known as goiter) or reductions. In addition, suspicious nodes can be punctured under Sonographiekontrolle.

Ultrasound-examination procedure

Depending on the region to be investigated, they are stored accordingly. The examination of the abdominal cavity usually takes place in the back position. First, a gel is applied to the sound head. This is important because without the gel the ultrasonic waves would be completely reflected through the air between the head and the skin and you would not receive ultrasound images. Through the movement and the possibility of different angles of the transducer on the skin, the desired organs and tissues can be viewed from different directions. The gel is removed completely after the examination has been completed.

In general, no special preparation is necessary for the sonography. If it is necessary for them to come to a sober investigation (e.g. B. At sonographies of the abdominal area), we will inform you about this in advance.


There are no contraindications (contra-indications). The sonography is an absolutely harmless and therefore risk-free procedure in which no radiation is emitted. Ä. is created. Therefore, the ultrasound can be used without hesitation even during an existing pregnancy and is therefore an integral part of the checkups.

Ultrasound examinations are part of our comprehensive range of services at our practice location in Witten. Please contact us if you have any questions about this topic!