Piezoelectric Effect and Reverse Piezoelectric Effect | Ultrasound Physics Course #11

High yield radiology physics past paper questions with video answers
Perfect for testing yourself prior to your radiology physics exam 👇
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The piezoelectric effect is the conversion of mechanical energy to electric signal. We can use this to receive echoes from the patient's tissues and convert these echoes into a digital signal. The opposite is also true. Electrical current applied across a piezoelectric material can induce a physical shape change in the material. This is called the reverse piezoelectric effect.
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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

[@quranforkidseasytranslatio2306]

What a relief! PZT dipole was a real challenge! May God bless you.😊

[@allansayed5633]

Even as a paramedic student, this channel can explain concepts in such a way with just enough detail that I can easily study the physics of medical imaging. Bravo.

[@fazaltahir4216]

Very excited for new video 🎉

[@radiologytutorials]

🎉

[@hfhmloving]

Thanks a lot, brother❤

[@9hla1986]

Wow, what a good explanation. I am a vet and this helps me a lot. Thx you 💕

[@radiologytutorials]

Glad it was helpful!

[@ahmedemara7231]

I need to contact with you, concerning piezoelectric measures of pvdf nanofibrous films

[@samuelosheidu8521]

THANK YOU

[@user-vv7qp3id4p]

How can make inverse sensor PZT

[@user-vz4sy7mt9q]

i love you my friend

[@hashemel-lakany286]

Sorry ..odd question...but 350 celcius...where does the heat come from ?

[@tkatu-os8dm]

I think it's somewhat misleadingly explained. Without poling, PZT crystals hardly exhibit any piezoelectric properties - their "dipoles" are oriented too randomly in this case, though they can orient themselves once high voltage is applied. The extent to which it occurs will depend on the conditions, and there are indeed different poling methods available, but the one most frequently used in PZT manufacturing involves heating it up above the Curie temperature. Heating the crystals up to the Curie temperature will make them stay in an electrically "neutral" state unless the external electric field is applied, but after it's gone, the "dipoles" lose their orientation (exhibiting paraelectric properties). As PZT crystals cool down though, the same electric field can be used to orient them permanently so that they stay "polarized" in a certain direction even below the Curie temperature (undergoing ferroelectric phase transition). After polling, PZT stays usable at room temperatures, meaning that the crystals aren't heated up to 350 degrees Celsius in an ultrasound probe, it's just a part of a manufacturing process.

[@user-zk5lt5xk5h]

Enjoyable lecture But you talk quickly If you cook a little, the talk will be better 🙂