Chapter 12 Physics

3. With linear sequential arrays, a ___ group of the crystals are fired simultaneously to create each sound beam.
5. The sound beam is ___ if the spike pattern is curved
10. is the firing pattern that focuses a sound beam
12. shape of an image created by a mechanical transducer, annular phased array, and linear phased array
13. is the firing pattern that steers a beam to the left or right
14. contain multiple active elements

1. delay also known as time differences
2. The primary advantage of annular phased arrays is that ___ transmit focal zones create each scan line of the image.
4. ___ array is a combination of linear sequential and linear phased array technologies
6. This also reduces grating lobes.
7. mechanical transducer contains a ___ active element
8. ___ thickness contributes to image quality
9. The sound beam is ___ if the spike line has a slope
10. damage to one of the elements of a phased array transducer results in ___ beam steering and focusing
11. ___reducing the strength of side and grating lobes can be achieved through a process called ___
15. ___ focusing is achieved dynamically by introducing electrical delays in the signals returning from the transducer