DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Transrectal ultrasound. Prostate biopsy using transrectal ultrasound. A biopsy is used to diagnose cancer or other disorders. An ultrasound scanner uses sound waves to build internal images of the body. During a transrectal ultrasound a transducer (in hands) is inserted into the rectum via the anus. The transducer emits high-frequency sound waves and detects the reflected echoes. The results are used to build the image, which is displayed on the monitor (top). The image will be used to guide a needle that will remove some prostate cells for examination. The prostate is a small gland found just below the bladder surrounding the urethra, the tube urine passes through. Prostate cancer is most prevalent in men over 50 years of age.
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