Since no examination procedure is perfect, it sometimes makes sense to combine several. In endosonography, the ultrasound examination is performed with an endoscopic examination (
Mirroring). With the endoscope, you can access hard-to-reach areas such as the esophagus, stomach, intestine, and coronary arteries; with the ultrasound device you can then assess structures in depth that you can not see with the reflection or can not adequately assess them. These include tumors, cysts and inflammation or prostate changes. Combined with an "ultrasound-controlled puncture", tissue samples can be taken in the same operation.
3. Ultrasound-controlled puncture
The more exact one
Tissue sampling the suspicious spot is hit, the higher the probability that the pathologist under the microscope can also make a diagnosis and the lower the risk of injury to surrounding tissue. Therefore, a puncture is often performed under the view of an ultrasound image. Thus, the area in question can be visited exactly and follow the course of the puncture needle. This method can be combined with a reflection (see Endosonography).
4. Doppler and color duplex sonography
The Doppler procedure can be used to determine the rate of blood flow in the heart and arteries and veins, as well as to assess vessel size and heart valves. You can see constrictions or closures, short-circuit connections and heart valve defects. The graphical representation can be coupled with acoustic signals. For example expectant parents - from the 12th week of pregnancy, the heartbeat of the unborn child can be heard. Combining the Doppler method with a normal ultrasound image is called duplexing. Thus, in addition to the blood stream, soft tissue structures can also be assessed at the same time. In color-coded duplex sonography, the blood flow is also shown in color (red for movement in the direction of the transducer, blue away from it, green for turbulence), allowing the vessels to be assessed very precisely.
Advantages and disadvantages of sonography
So far, no risks of ultrasound examination are known. In contrast to X-ray examinations, the sound waves do not damage the tissue, the simple procedure is - until a light feeling of pressure - painless. Disagreement, the researchers are so far with respect to the effect on unborn children. Investigations have shown that they cause more kicking when the mother is "sounded." The extent to which this could be a sign of childhood stress is still unclear, and the biggest "side effect" is the gel, which tends to be in Undershirt and trousers strayed. But since it is colorless and contains mostly water, this problem is resolved at the latest with the next wash.