AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Ultrasound scan. Doctor using ultrasound to investigate a patient's internal organs. The ultrasound scanner emits sound waves which are reflected back to the scanner. The distance the waves have travelled is measured and an image of the organs is built up. The doctor is looking at a computer screen, where an image of the patient's organs is displayed. He is looking for the presence of cysts, abnormal growths and infections.
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