6.8. The transducer array of a linear-array real-time imaging instrument has 32 unfocused elements. Each element is 0.5 cm wide, and there is a nonradiating gap of 0.5 cm between neighboring elements. Only one element at a time is excited. (a) At a frequency of 3 MHz, find the lateral resolution of this instrument at a depth of 1 cm and at a depth of 8 cm. The lateral resolution of a linear-array imager is given by the beam size or the line spacing, whichever is larger. (b) If echo information out to a depth of 12 cm is desired, calculate the minimum time required to scan the entire array.
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**Part a) Finding the lateral resolution at depths of 1 cm and 8 cm** Show more…
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Adi S.
The key factor determining the fraction of ultrasound reflected at a large interface is: - Depth of the interface - Transducer diameter - Transducer output intensity - Differences in acoustic impedance - Scan mode Higher frequency transducers have increased: - Thickness - Intensity - Attenuation - Velocity - Wavelength A 2 MHz transducer has an approximate wavelength of: - 0.01m - 0.1m - 1 mm - 1 m - More than 10m Snell's law describes the relation between the: - Incidence and transmission angles - Fraunhofer angle and wavelength - Reflection and refraction angle - Focus and transducer curvature - Fresnel zone and wavelength. The velocity of an ultrasound beam is always: - Constant - Proportional to angle - Equal to frequency multiplied by wavelength - Equal to the velocity of the cells in tissue - 3,000,000 km/s The Doppler effect from a moving object depends on all of the following except: - Speed of U/S - Frequency - Angle between beam and object - Object depth - Object speed
Consider a focused transducer with a radius of curvature of 10 cm and a diameter of 4 cm. This transducer operates at a frequency of 3.5 MHz, and transmits a pulse of duration 0.857 μs. What is the lateral resolution at the focal point of the transducer? The speed of sound in the tissue is 1540 m/s. A. 0.44 mm B. 0.22 mm C. 1.1 mm D. 0.11 mm
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