Axial Resolution | Ultrasound Physics | Radiology Physics Course #17

High yield radiology physics past paper questions with video answers
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When looking at ultrasound resolution we can separate resolution into four categories: axial resolution, lateral resolution, elevational resolution and temporal resolution. In this talk we will discuss axial resolution and examine the relationship between spatial pulse length and axial resolution. Once we have defined the role SPL plays in axial resolution we can then see which factors we can change in order to improve axial resolution.
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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

[@ufarazuwasti]

looking fwd to more videos :) they're all great and super helpful!

[@radiologytutorials]

Thank you Ufara. Glad you like them ☺️

[@robeenaanjum6166]

06:19 in your example the two boundaries are at 1/2 SPL distance and can't be resolved so how can we consider it as the least possible resolvable distance? Shouldn't we say that the distance must be greater than 1/2 SPL and NOT the 1/2 SPL itself?

[@dishakhobragade8192]

Excellent Explanation. It helps a lot in my project.

[@radiologytutorials]

Glad it was helpful!

[@anshujohn6388]

Thank you soo much for these videos...really appreciate your efforts.i was wondering if you could make a video on anatomy on HRCT temporal bone please..

[@saleemtoro6559]

excellent work

[@radiologytutorials]

Thank you Saleem!

[@mirzawaqas9563]

Hello ! I have a question As you described that decreasing SPL to less then 1/2 will make axial resolution to lost , and dampening causes SPL to decrease so shouldn’t the axial resolution be decreased too ?

[@RadGab17]

If you decrease the SPL, shouldn't that decrease rather than increase axial resolution according to your formula: axial resolution limit = 1/2 SPL ?

[@sid17391]

with a higher frequency probe shouldn't you get a deeper focal zone? thus a Bir more depth. as well as better axial resolution?

[@radiologytutorials]

Great question. Sorry for the delay! Yes, higher frequency increases focal zone depth and axial resolution. However, higher frequency waves are attenuated much more rapidly than lower frequencies. Therefore, the intensity of signal at greater depths from higher frequency waves is smaller than in low frequency waves.

[@gcwcooper7538]

If wavelength is something which changes (to compensate for speed changes) as opposed to frequency throughout tissues, then why does the SPL not change in length the deeper you go? (and therefore axial resolution reduce).

[@radiologytutorials]

The SPL will change ever so slightly depending on the speed of the wave in the tissue. It will not be depth dependent though as the speed of the wave is not dependent on depth but rather tissue type.

[@gcwcooper7538]

@@radiologytutorials Thank you so much for answering!