Please note: I say speed of EM radiation doesn't change in different mediums. This is incorrect! However, in radiology physics we often assume the speed of electromagnetic radiation is constant despite minor material dependent speed changes, as these changes are imperceptible to our detector systems. Creating an ultrasound image relies heavily on accurately knowing the speed of sound; the production of radiographs and CT images do not rely on knowing the speed of electromagnetic radiation. Therefore, although not technically true, the comparison is often stated as electromagnetic radiation speed is constant and acoustic wave speed is variable (such as I've done in the video).

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In the last talk we mentioned that the speed of sound changes depending on the medium through which it is travelling. The frequency of that sound wave remains the same. Here we will look at the elastic and inertial properties of the medium that will determine the speed at which sound travels.

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Not sure if the question banks are for you?
If you're here, you're likely studying for a radiology physics exam. I've spent the last few months collating past papers from multiple different countries selecting the most commonly asked questions. You'll be surprised how often questions repeat themselves!

The types of questions asked in FRCR, RANZCR AIT, ARRT, FC Rad Diag (SA), ABR qualifying Core Physics and MICR part 1 are surprisingly similar and the key concepts remain the same throughout. I've taken the most high-yield questions and answered them in video format so that I can take you through why certain answers are correct and others are not.

Happy studying,
Michael

#radiology #radres #FOAMrad #FOAMed