Hi, could you please answer part a and part c. part b is a
description for the image attached.
thankyou
2. Demonstrate the magnitudes of typical time delays between
pulse emissions from different transducer elements when focusing
and steering the ultrasound beam by performing the following
calculation.
a. Consider a 300 element, linear transducer, which is 50 mm
between the centre lines of the first and the three-hundredth
elements. Determine the pitch of the elements, that is to say, the
distance between the centre lines of successive elements.
b. At a given time, a single beam is generated by an active
group of 19 elements. This beam is steered 11.5 degrees off-axis to
the right as measured at the centre of the group to a focal point
at a depth of 6.5 cm. Figure 1 (below) is a schematic diagram of
this single group showing elements 1 to 19 (not all elements are
shown) and the focal point. (Note that this diagram is not to
scale. Diagrams that are not to scale are often used in
diagrammatic representations. In this case, the group of elements
appears to be much larger than its actual size relative to the 6.5
cm depth dimension which appears much shorter than the actual
depth, and the 11.5 degree angle appears much larger than 11.5
degrees.)
c. State the order in which elements 1, 10 and 19 have to be
fired. Then, calling the time at which the first element is fired,
time zero, calculate the time at which the other two elements are
subsequently fired. The two successive times will be given in ms,
μs, or ns as appropriate. Calculate, finally, the time delay
between the firing of successive elements in the array.
- Ultrasound Physics Questions Hi Could You Please Answer Part A And Part C Part B Is A Description For The Image Attac 1 (32.37 KiB) Viewed 34 times