2) Suppose you emit an ultrasound pulse in the x direction from a source at each of eight different positions y. Each pulse receives a series of echoes, as shown in the table below (Echo times are in μs.): y (mm): 0/10 /20/ 30/ 40/ 50/ 60/ 70 Echo1 35/ 37/ 39/ 40/ 45/ 47/ 48/ 49 Echo2 97/ 98/ 58/ 56/ 57/ 96/ 91/ 90 Echo3 71/ 73/ 71/ / / / / Echo4 99/ 99/ 98/ / / / /
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
1) Suppose you send a short ultrasound pulse into the body at t = 0, and observe echoes at t = 31, 79, and 95 μs. How far from the source are the three tissue boundaries? Assume c = 1540 m s−1 in each tissue, and ignore attenuation. Draw a line corresponding to the x-axis (x = 0 is the source location), and draw a dot at the position corresponding to each boundary. You have just created an A scan, where each dot represents a boundary.
2) Suppose you emit an ultrasound pulse in the x direction from a source at each of eight different positions y. Each pulse receives a series of echoes, as shown in the table below (Echo times are in μs.):
y (mm): 0/10 /20/ 30/ 40/ 50/ 60/ 70
Echo1 35/ 37/ 39/ 40/ 45/ 47/ 48/ 49
Echo2 97/ 98/ 58/ 56/ 57/ 96/ 91/ 90
Echo3 71/ 73/ 71/ / / / /
Echo4 99/ 99/ 98/ / / / /
Draw an x–y coordinate system (x = 0 is location of the source) and put a bright spot corresponding to each echo. Assume c = 1540 m s−1 in each tissue, and ignore attenuation. You have just created a two-dimensional ultrasound image.
3) Make a photo of your A- and B-scans and submit as an answer to this task.
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