Spreading Rad Love of how x-ray and CT physics can be fun. How Radiology Works is a fun channel for Radiologic Technologists / Radiographers and students in these programs, often called Radiology School. We make x-ray and CT physics relatively painless. These topics include: x-ray generation, x-ray interactions, x-ray radiation dose, radiation biology, image viewing, and image quality.
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Hi, what about SPECT/CT or PET/CT scans? How do I calculate the dose for the whole body, should I use the "k" for the trunk? DLP from Whole Body scans is measured from 32 cm phantom, so how do I calculate the dose for the head? Is it multiplied by 2 more or less?
I would like to see actual numbers with and without shielding to see the actual dosage to the gonads. Not your pictures. I am registered with the ARRT, not How Radiology Works, the AAPM, or the NRCP. The ARRT says students and R.T.s have the ethical responsibility to act in the best interests of each patient. Students are still being taught to shield and it is on the registry. Technologists can not be doing one thing and students being taught another. It only takes one ray to hit a cell just right to cause damage. I will never not shield or allow myself to not be shielded on an exam where shielding does not obscure the part being examined. The actual report that came out by the NRCP was never about not shielding. It was about shielding abdomens and pelvis’s using AEC. Somehow the report has been twisted and hospitals and medical facilities are doing away with shielding. Radiologic Technologist’s who agree with the no shielding stance should not wear appropriate shielding for themselves. 😤
Thanks for your comment and your passion on the matter. I agree that ARRT has not yet adopted the recommendation of the AAPM and that the transition away from gonad shielding will take time as there is a perception that it is helping more than reality. As we mentioned there are downsides of gonad shielding which are completely different from personal shielding for technologist so please do not compare them. I agree we want what is best for the patient here and given all of the evidence the AAPM consensus statement is that gonad shielding should be discontinued and in time this will be propagated to ARRT but will take some time. Thanks again for your comment and consideration.
What IS sampling frequency? I know we calculate it based on the Pitch / DELs etc, but what is its significance/what does it represent? I must be missing something significant because I've looked everywhere and I can't figure out if it's anything other than pointless extra measurement somebody came up with; it feels like I'm being told "The Abracadabra Value of the FPD is equal to twice the pixel pitch". Okay, the abracadabra value is 1mm; why does it matter, what new information does this give us we didn't have before, and why do I care? Why did I make up the abracadabra value in the first place? I have the same questions for Sampling Frequency. It's 2mm^-1, why does that matter? What do I know now that I didn't know before? I know we say it's another way to determine DEL size, but so is the abracadabra value, so is the Sampling Frequency and the Abracadabra value equally useful? Can someone please unlock this for my brain to understand before I end up in a mental institution.
howradiologyworks.com/digital-x-ray-sampling/ check out our post with the sampling frequency. We like units of frequency as traditionally we measure resolution in frequency such as the MTF. You can think of sampling frequency of the detector as the best that you could do on the resolution of the system and there are geometric effects and the focal spot blurring
Don’t be highly worried about CT dose actually doctors and medical workers try to use lowest dose for patients and the risk of cancer caused by CT scan is just theory with the low ratio about 0.002-0.04% Otherwise, DPL parameter is not the total amount patient absorbed , it’s the dose of CT scanner.
get rid of the music please, it makes it very difficult for me to hear you or concentrate on what you're saying. if I wanted to listen to music I'd be googling billie eillish not x-ray tube voltage potential
Your videos are a brightness(Density) in my dark world. I have my exit exam coming up followed by my ARRT boards. I don’t think I’ll pass but I know by watching your videos I’ll understand and improve thank you
Thanks for dropping the message, best of luck. Watch the videos and do practice problems and you should be good. I know it’s stressful learning all this new information.
I am in need of some clarification. For pulsed fluoroscopy, I understand that a grid-controlled xray tube is utilized. However, I am having trouble narrowing down the specifics of this "grid". One textbook says it's the charged focusing cup, another source mentions an extra hardware component (charged wire mesh), placed between the cathode and anode. Is it one or the other, or both? Thanks
@@TheNettforce yes but it seems like the same concept. Increase voltage increases energy of the photon while adjusting amplitude controls the amount of photons passing through.
. Which of the following system can deal with HL7 and DICOM messages? A. Picture archiving and communication system B. Radiology Information System C. Hospital Information System D. Billing system I need your help answering this question
For an abdominal Ct Scan that had 152 mGy*cm -- is that a lot of radiation? How much in msv? I know they grade CT scans like 1-8 sometimes? Chest Xray is .01 ?
The line spread function is directly related to the MTF, the MTF is the Frequency space representation of the LSF. The blue in the image is due to the detector blur and focal spot blur
Thank you for the helpful videos on your channel from a first year student. I have a question about the depiction of photoelectric absorption please: I see that you have an x-ray emitted as the characteristic radiation from the atom along with the photoelectron. I've learned in one of my modules that effectively all of the elements that make up the body have such relatively low Z numbers (and therefore lower binding energies and electron energy states) that the characteristic radiation they emit during this process would be much lower frequency - in the infrared. How common would it be for a naturally occuring element in the human body to emit x-rays as characteristic radiation?
My 12 year old daughter just got done an xray to the pelvis and I will like to know if that will cost any damage to her ovaries and eggs. Thanks. I'm very worried about it.
At these low doses there will not be an impact to fertility based on the literature, as always I don’t provide any medical advice for a particular individual.
sir i am 22yrs unfortunately i got one CT scan contrast of appendix 1 year ago but reports was normal and appendix was not there but i am worried about might be ct scan cause cancer or impotence in future kindly sir guide me what should i do to detox my body from ct scan side effects
@haris-gq1zm It's ok you will be fine .......you got very low amount of radiation. Your cells were recovered immediately after the examination. I am a CT technologist.
