Here are some key points about ultrasound scans. More detail is in the main article.
Ultrasound scans are safe and widely used.
They are often used to check the progress of a pregnancy.
They are used for diagnosis or treatment.
No special preparation is normally necessary before an ultrasound scan.
The transducer, or wand, is normally placed on the surface of the patient's body, but some kinds are placed internally.
These can provide clearer, more informative images.
.an endovaginal transducer, for use in the vagina
.an endorectal transducer, for use in the rectum
.a transesophageal transducer, passed down the patient's throat for use in the esophagus