Lateral and Elevational Resolution | Ultrasound Physics | Radiology Physics Course #18
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- čas přidán 13. 04. 2023
- High yield radiology physics past paper questions with video answers
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Axial resolution was dependent on spatial pulse length. Lateral and elevational resolution are dependent on beam shape. As we've seen beam shape is largely dependent on transducer element diameter and ultrasound probe frequency. If we need to change lateral or elevational resolution at a certain depth we can utilise phasing of the beam to do so.
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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.
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Recently started my radiology training and I'm grateful this exists. You have a talent for teaching - Thank you!
Thank you. I hope they serve as a good starting point!
Working for my ERS lung ultrasound certificate. This helped a lot. Thank you!
Glad it was helpful! Best of luck with your studying 🙂
Sir does the 1D transducer array means it has only columns of transducer elements and not the rows??
I am studying for physics foundation year medicine. this is helpful thank you
Glad it was helpful!
When CT physics coming
Is focal distance and near field the same? If frequency increases the near field increases. According to Farr texbook as focal distance decreases beam width decreases and hence lateral resolution improves but with higher frequency focal zone increases and hence lateral resolution should decrease right? I'm kind of confused here
Near field length and focal distance are the same. When focal distance changes as a result of phasing (ie shortening focal length by releasing peripheral pulses slightly before central ones) then the beam gets slightly narrower - because of the interference patterns of the waves. However, that doesn’t automatically mean a closer focal zone is always narrower. Changing focal distance with frequency alone does not change beam width (lateral resolution) in this case without focusing (by phasing) the beam width will be half the transducer diameter. Hope that make sense 🤪
@@radiologytutorials yes it does. Thanks a bunch :)
Sir can you once again explain 1D, 1.5D and 2D transducer array types??
The difference is the amount of rows to columns of pzts that a transducer has. 1D has 1 row many columns. 2D for example has the same amount of rows and columns resulting in a box.
When the ultrasound mcqs coming
I've filmed 3 of the 7 sections. Hopefully soon! Want to make sure they're perfect.
This is seriously the best radiology physics tutorial available!! Thank you! It would be really helpful if you make a series on nuclear medicine physics as well!!
Thanks, Harry Potter!
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