"Sound" is a mechanical wave traveling through a medium. Ultrasound is sound, but its frequency is higher than humans can hear.
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Endorectal ultrasound
Endorectal ultrasound (ERUS) is a procedure where a probe is inserted into the rectum and high frequency sound waves (ultrasound waves) are generated
A sonogram
The population in which this procedure is normally done is elderly
Since ERUS is a minor invasive procedure, there is no aftercare
Normal results of endorectal ultrasound include a normal thickness of the rectal wall, absence of masses or lesions, and normal lymph nodes. The presence of any abnormalities such as tumors, polyps, or abnormal thickening of the rectal wall may indicate underlying issues that need further evaluation.
Abnormal results range from any number of congenital deformities in the lining of the rectum to serious rectal cancers
ERUS is used as a diagnostic procedure in rectal cancer to determine stage of the tumor and as a post-radiation, presurgical examination to assess extent of tumor shrinkage
For many jobs with higher salaries, a certification or degree is required. This holds true for being an ultrasound technician. In this school you will get the training that will prepare you for a job in this field. Many jobs do require an ultrasound tech degree for employment.
One can not buy a ultrasound salary. One has to work for an ultrasound salary. There are no websites that sell them and probably will never be any websites that do.
You can take an ultrasound technician practice test online or in person, many websites provide practice tests for you to take digitally or print in order for you to prepare for your legit test.
One can find a guide on how an ultrasound works by visiting the website How It Works. At this website, one can get a step by step description of how the ultrasound operates, including the scientific principles.