Question no 2

(b) While the beam from a single element ultrasound transducer may have sidelobes, the beam from an array transducer such as this may, in addition, exhibit grating lobes. (i) What causes sidelobes, and what causes grating lobes? (ii) When designing a transducer for imaging, are sidelobes and grating lobes benecial or disadvantageous? Give reasons for your answers. (iii)At what angles from the axial direction are there grating lobes for this transducer? (iv)Keeping the element width the same, what is the maximum size the kmf can be while ensuring no grating lobes appear in the imaging plane, when the beam is on axis