• USS relies on a dual-mode transducer, which first sends high-frequency sound waves into the patient and then receives the reflected waves to generate an image
• Images may be displayed as a two-dimensional gray-scale image or as a color Doppler
• Frequencies used in medical sonography range from 2 to 10 MHz
• The higher the frequency, the better the resolution, but the poorer the depth of penetration. Small part probes for scanning testes and the penis operate at a frequency of between 7 MHz and 9 MHz, while an abdominal scan in an obese individual requires a 2.5-7 MHz transducer
Ultrasound scanning is cheap, easily accessible, painless, safe for the patient, and provides excellent real-time anatomical as well as functional information on the entire urinary tract.
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