David Sang and Graham Jones Solutions for Chapter: Medical Imaging, Exercise 6: Questions

Quartz is an example of a piezo-electric material. The speed of sound in quartz is $5700{ \mathrm{ms}}^{-1}$.

(a) Calculate the wavelength of ultrasound waves of frequency $2.1\mathrm{MHz}$ in a quartz crystal.

Quartz is an example of a piezo-electric material. The speed of sound in quartz is $5700{ \mathrm{ms}}^{-1}$.

(b) If the crystal is to be used in an ultrasound transducer, its thickness must be half a wavelength. Calculate the thickness of the transducer.

Piezo-electric crystals have many applications other than in ultrasound scanning. For example, they are used in:

(a) Gas lighters (to produce a spark).

Piezo-electric crystals have many applications other than in ultrasound scanning. For example, they are used in:

(b) inkjet printers (to break up the stream of ink into droplets).

Piezo-electric crystals have many applications other than in ultrasound scanning. For example, they are used in:

(c) guitar pickups (to connect the guitar to an amplifier).

Piezo-electric crystals have many applications other than in ultrasound scanning. For example, they are used in:

(d) the auto-focus mechanism of some cameras (to move the lens back and forth).