Medical Imaging Systems · Ultrasound Imaging · 2 marks · Multiple choice
A 3 MHz transducer sends a three-cycle pulse normally toward a fat–liver boundary. Use tissue speed 1500 m/s, fat speed 1450 m/s,liver speed 1570 m/s, fat density 920 kg/m³,liver density 1060 kg/m³. Find axial resolution in mm and pressure-amplitude reflection coefficient.
Tissue wavelength is 1500/(3×10⁶)=.5 mm. Three-cycle spatial pulse length is 1.5 mm and axial resolution is half that, .75 mm. Acoustic impedances are Zfat=920×1450=1.334×10⁶ and Zliver=1060×1570=1.6642×10⁶. Pressure reflection coefficient=(Zliver−Zfat)/(Zliver+Zfat)≈.1101. Thus D.
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