Ultrasound is used in medicine both for diagnostic imaging Fig P17 9 page 526 and...
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Ultrasound is used in medicine both for diagnostic imaging Fig P17 9 page 526 and for therapy For diagnosis short pulses of ultrasound are passed through the patient s body An echo reflected from a structure of interest is recorded and the distance to the structure can be determined from the time delay for the echo s return To reveal detail the wavelength of the reflected ultrasound must be small compared to the size of the object reflecting the wave The speed of ultrasound in human tissue is about 1 500 m s nearly the same as the speed of sound in water a What is the wavelength of ultrasound with a frequency of 2 40 MHz b In the whole set of imaging techniques frequencies in the range 1 00 MHz to 20 0 MHz are used What is the range of wavelengths corresponding to this range of frequencies B Benoit Photo Researchers Inc Figure P1794 view of a fatur
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