Understanding CT scans

CAT or CT scans are used to achieve high resolution images inside the body. But how do they work?
Watch the video to find out
See more Medical imaging techniques here -

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[reikokirkland]

THANK YOU SO MUCH! please continue uploading Radiology related videos like these :)

[HowRadiologyWorks]

Thanks for the great video Paul. Since a general audience is watching these videos please be very careful with your word choices. CT scans are low radiation dose and low risk of cancer induction although it is higher than x-ray it is not common to refer to it as a high level of radiation. Thanks again

[zeitgeist]

I am not sure why at 0deg we don't just see a solid black block? Surely, the densest part of the block is at the 'top (left)' (ie the first things the x-rays hit) so the less dense layers underneath are shaded out? When we see an image of say a hand in Xrays the bones are dark and the flesh and skin is light? So it's a top-down 2-d image with the (dark) bones inside the (lighter) fleshy hands. I just can't seem to understand why we see a white rectangle with black either side? How is it not just a solid black rectangle?

[sarahmccoy]

Radiation?
Danger Will Robinson! Danger!

[rahalhettiarachchi]

Thank you very much! Please do a video on MRI scanner if you can

[micah]

Can cause radiation poisoning and sickness by causing massive cell death. Huge amounts of ionizing radiation and often are not worth the risks

[marcojouve]

Which one is better CT Scan or MRI or less danger Please ?

[ravindranathhospital]

Why do substances with more density are going to be white in color?

[intexclouds]

I wonder how it pictures the brain...since the brain is completely surrounded by dense cranium, should we not see only a white ring around a dark region ?....and how does it estimate the thickness of the skull (as the x-rays only impinge on the skull from the surface and the back of a given section is always obscured by the front of a diametrically opposite section of the cranium)?

[BeautyBehindTheScience]

Can you please tell me for how long is the head exposed to these rays? What are the dangers ?

[Fatima-fobv]

So it's just a click bait and you aren't scanning a cat