Compton Scatter | X-ray interaction with matter | X-ray physics | Radiology Physics Course #24

High yield radiology physics past paper questions with video answers
Perfect for testing yourself prior to your radiology physics exam 👇
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I have also created two RADIOPAEDIA LEARNING PATHWAYS
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WHAT’S INCLUDED?
✅This KZbin series Ad free
✅Constantly updated Radiopaedia articles
✅Summary slides
✅Key take home bullet points throughout
✅Multiple review quizzes
✅Short answer review questions
✅Official Radiopaedia course completion certificate
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Compton scatter is an unwanted event that occurs when X-rays interact with matter. The scattered photons reduce image contrast and increase noise within the radiograph. Compton scatter contributes to patient dose whilst decreasing image quality. Today we will discuss the mechanism of compton scatter and the factors that effect the likelihood of scatter to occur.
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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

[@priyanshisharma0705]

Your channel.is really so helpful for us ...from india😊😊

[@godwinlumorvi7774]

Your tutorials are really helpful.I am a radiography student from Ghana.

[@radiologytutorials]

Great to hear Godwin. Regards from South Africa 🇿🇦

[@aggelinit]

Many thanks for your great work! You have totally saved my exams many times ! I think there is a mistake when you mention that “ the greater the θ angle, the larger the amount of energy the electron transfers” . When the θ angle is large that means that the scattered photon had low initial energy that can be transferred to the electron , since high energy photons tend to stay close to the initial direction while losing higher amounts of energy that is transferred to the electron .

[@chloeshand5616]

Thanks so much for the tutorials, they're really great. I love the way you explain things. But I need help with why you say that scatter increases noise. I understand exactly why scatter radiation would reduce the image's contrast, but I can't see why it would make the image noisy. To me, noise is due to a lack of signal (is this my MRI brain talking?), so a grainy, noisy-looking image would be due to an underexposure. Whereas scatter (photons at an angle) would be an unwanted signal - so it won't make the image look "noisy or grainy", but act like a smooth fog over the image (reducing contrast). Is it my interpretation of what the word "noise" means? Noise is an unwanted signal - so is scatter noise? I think it's so important that radiographers can distinguish a digital image that is "noisy" (to me, this means it lacks signal - underexposed) from one that lacks contrast (potentially over-exposed, or too much scatter).

[@caposolomon8745]

Who's here is also doing a master in health physics?

[@minakshi2412]

Hi, will the released electron in Compton be called a photoelectron? Or a recoil electron? Thanks in advance.

[@chazsison]

Sir you are so amazinggggg. Please upload CT physics too❤

[@radiologytutorials]

Thank you Chaz. CT physics still to come! Trying my best to get these out as quick as possible 🙂

[@reeyfranklin5385]

hi thanks for these lectures.You just said that with photoelectric effect a photoelectron is released and doesnt form an image but confers dose to the patient,How then is an image formed coz you again said that you want photoelectric effect for image formation via different tissue densities?

[@chad969]

I'm confused about the text under this video on your Radiopedia review course. You pasted a section from a radiopedia article titled "Scatter to primary ratio" that lists five measures for decreasing the scatter ratio, two of which are "decreased subject to film distance" and "air gap". That seems contradictory, since an air gap is the distance between the subject and the film (or detector). It's as if it's saying that creating distance between the object and the detector decreases scatter, and closing the distance between the object and the detector decreases scatter. How can two directly opposite techniques both reduce scatter?

[@radiologytutorials]

Thanks for letting me know. It's been updated! Air gap is the correct answer

[@sport_bubble]

Great videos. Thanks. Questions: 1. Do photoelectric effect and Compton scatter consider ionization? 2. What happens to vacant valence electron in Compton scatter?

[@radiologytutorials]

Great questions. 1. Yes, both are ionising events. 2. The vacancy left after Compton scatter is filled by surrounding ‘free’/valance electrons. The ion is reduced by gaining an electron in the valence shell. No characteristic x-ray is formed because it is not getting the electron from a higher energy shell within the atom 🙂

[@sport_bubble]

Thanks for the reply.

[@KhamosWest-yi8rl]

Thank you so much Sir Kindly I'm inquiring about the question bank you talked about in the video

[@radiologytutorials]

Hi Khamos - there's a link in the first line of the video description if you are keen to check the question bank out 😊

[@Darkkk5128]

kzbin.info/www/bejne/n4OrYXp4mcdkh9Esi=6Ilc6ZDi0pNujbUv

[@kennyx8482]

i read many texts tryna udnerstand difference between compton effect n photoelectric effect...but not one mentioned that photoelectric effect is a FULL ON collision, while compton effect collision isnt...and theres ur rum..thank you sir

[@radiologytutorials]

Makes such a difference when you realise all of the x-ray energy is absorbed by the electron in photoelectric effect. Was a lightbulb moment for me too!

[@Jesus_peking]

Sir thanks for your contributions, I am a radiology student studying in India, can you please drop the link of the question bank.

[@radiologytutorials]

Absolutely! Love to hear where everyone is from 👍www.radiologytuts.com/bundles/x-ray-ultrasound-and-mri-question-banks

[@preciousdayo3634]

where’s the link for the saq questions

[@radiologytutorials]

There should be a link in the description of most videos 🙂

[@labala09]

is photo electron and auger electron the same?

[@radiologytutorials]

Technically not. An auger electron is emitted after the vacancy is filled which is a slightly different process than Compton scatter and photoelectric effect. Although the two are often used interchangeably. It’s best to use the term photoelectron when talking about an electron that is released as a direct result of an incident x-ray

[@Md_alosta_2004]

Great mbro ❤ Keep going 💯

[@radiologytutorials]

Thanks mate 💯

[@udbhavkrishnagaur]

From India❤🎉

[@radiologytutorials]

Much love from South Africa ❤️

[@mrwhite680]

Thank you 🙏

[@radiologytutorials]

🤗 Thanks for your support!

[@YeshaniNethmi-q6o]