kVp and x-ray Contrast (Guide for Radiologic Technologists)

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Күн бұрын

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@kaoriyamato2235 2 жыл бұрын

Thank God I found this video. I study radiography and currently struggling with Physics. You're channel is amazing and very informative! Thank you, Sir!

@TheNettforce 2 жыл бұрын

You’re welcome Kaori. Really appreciate your comments. Your only job now is to share with your classmates.

@authman-alshibly 2 жыл бұрын

Brief yet truly informative!

@TheNettforce 2 жыл бұрын

Thanks

@devduttupadhyay04 6 ай бұрын

currently watching as i have a radiation physics exam due tomorrow, glad i found this channel, thank you so much respected sir

@HowRadiologyWorks 6 ай бұрын

Good luck on the exam. Let me know if there is something on the test you can’t find on the channel to pay it forward

@devduttupadhyay04 6 ай бұрын

@@HowRadiologyWorks Dear sir, thanks for your best wishes, the exam went well and this channel is for sure a treasure i will cherish , i have found everything that i needed so far on this channel and am really glad for your help

@HowRadiologyWorks 6 ай бұрын

@@devduttupadhyay04 awesome to hear it. Thanks for the well wishes and glad that the exam went well. Good luck in the rest of your courses.

@selinasawan6895 2 жыл бұрын

Such a well explained and helpful revision video than you so much 🌼🌼🌼

@HowRadiologyWorks 2 жыл бұрын

You’re welcome, thanks for dropping the comment

@medicalelectronicsrepairs Жыл бұрын

Thank you for your good information.❤️❤️

@HowRadiologyWorks Жыл бұрын

You are so welcome medical services😉

@MaryHood-ok3jt 10 ай бұрын

In regards to using 50 kVp for a hand; I wouldn't use less than 60 kVp for anything on an adult size person with digital imaging. Since contrast is adjustable on the display, use as high a kVp as will not overpenetrate the part, and reduce the mAs to reduce ESE while maintaining IR exposure at the level that results in a high quality image.

@HowRadiologyWorks 10 ай бұрын

radiopaedia.org/articles/hand-bilateral-pa-view-1?lang=us , thanks for your comment yeah right in that range is good and Radiopedia recommends 50-60kVp. If you have a hand phantom you can figure out for your system what kVp gives you optimal CNR. It should be in that range.

@user-bk7bc2yb2h 3 ай бұрын

Such a well explained and helpful revision video than you so much

@HowRadiologyWorks 3 ай бұрын

Glad to hear that! Thanks for the comment 😊

@emilyzeno7199 Жыл бұрын

If you have a high REX number and a low exposure index number would this be due to a high kVp?

@aselaindunil6604 2 жыл бұрын

Good explanation 👍

@HowRadiologyWorks 2 жыл бұрын

Thanks Asela, glad you liked it. Share with your colleagues.

@ramjisen8199 2 жыл бұрын

Good explanation sir

@HowRadiologyWorks 2 жыл бұрын

Thanks Ramji

@edwardlaw797 Жыл бұрын

To highlight bone structure Kvp and mAs are adjusted. How much more radiation does that expose to patients? E.g., typical chest x-ray standard is 0.02-0.04 mSv.

@HowRadiologyWorks Жыл бұрын

The kVp is adjusted before the exam and the mA is selected before and the time may be set manually or using automatic exposure control. So the selection of parameters is not extra exposure

@abdovitamins6331 Жыл бұрын

I am extremely confused, how can we use higher kVp values in barium enema alone?! Isn't it supposed to the photoelectric effect to predominate at higher atomic number msterial, k edge for barium 37 so we should be using lower kVp values 🤯

@shastriramroop4815 10 ай бұрын

How would you determine kVp and mAs for mobile chest radiographs?

@HowRadiologyWorks 9 ай бұрын

Mobile x-ray is similar to traditional x-ray where the body part will dominate the optimal technique. Did you have a specific body part in question?

@shastriramroop4815 9 ай бұрын

@@HowRadiologyWorks chest xrays done on a mobile unit.

@chad969 6 ай бұрын

Hello, one of the quiz questions on the ARRT prep website Corectec seems to contradict the teaching that kVp affects contrast. I'm hoping you can tell me if the website is in error or offer clarification. The quiz question says: _"In order to achieve an exposure as low as reasonably achievable, which of the following changes can be made with digital imaging WITHOUT changing the brightness or contrast?"_ According to the website, the correct answer is this: _"Increase kVp, decrease mAs"_ Is this really saying that increasing the kVp doesn't change contrast? I thought higher kVp resulted in a longer scale of contrast. There must be some nuance here that I'm not grasping.

@HowRadiologyWorks 6 ай бұрын

Yes there is some subtleties that they are considering digital imaging of soft tissue. If the exam was to look at a contrast enhanced region I believe the optimal kVp would be lower. So I believe the question should say with minimal change in contrast, rather than without. Feel free to submit a question to that team for clarification as well but this is my interpretation. I do agree that with digital processing the kVp selection becomes less impactful.

@chad969 6 ай бұрын

@@HowRadiologyWorks I see. Thank you for the reply

@AngEP78 3 ай бұрын

According to the ARRT, kvp is not considered the main controlling factor for contrast in digital radiography. Computer processing factors like the LUT and window width are. That’s not to say kVp plays no part in contrast, but compared to film, its influence is significantly less.

@TheNettforce 3 ай бұрын

@@AngEP78thanks for the comment. Yes I believe that is consistent with what I mentioned above that kVp has less impact than before but I don’t think it’s correct to say no impact as the question posed. Thanks again

@Rainbow_1312 11 ай бұрын

6:30 typo: Penetration*

@HowRadiologyWorks 11 ай бұрын

Thanks I should have copied it from the previous slides I guess

@haroutzeitounian4187 2 жыл бұрын

Good subject excellent what about mas

@HowRadiologyWorks 2 жыл бұрын

Good idea Harout. I will make another video on mas relatively soon. It seems I can only keep peoples attention for a few minutes so separating out to smaller videos.

@juanabeltran4167 Жыл бұрын

Can u please do anything on Mammography machine. Or guide me to be more knowledgeable

@victorgonzalez2927 Жыл бұрын

I’ve never shot a hand above 65kv. Who uses 70+ kv on an extremity?

@HowRadiologyWorks Жыл бұрын

Yes you are right in extremities I was including shoulders also that are typically in the 70s but hands would typically be in the 50s. Thanks for the clarification