MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Prostate examination. View of a doctor using colour doppler ultrasound scanning to examine a patient's prostate gland. The doctor is holding a transducer (lower centre) to the patient's lower abdomen. The transducer emits high-frequency sound waves (ultrasound) which echo off internal structures. The echoes are detected and used to construct an image. If the waves hit a moving object (such as blood flow or urine flow) the frequency of the echoes may be altered (the doppler effect). A doppler ultrasound scan can therefore detect defects in blood or urine flow, or may show a tumour or cyst.
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