How a CT Scan Works by Vanderbilt Biomedical Engineers

The workings of the Computed Tomography Scan described through the music of some of Disney's classic songs. "A Whole New Scan" (to the tune of "A Whole New World") I can show you your brain kidney, liver or pancreas Tell me, princess, now when did you last see your heart in 3D Now we can use CT Computed Tomography can go Over, sideways and under In a helical CT scan A whole new scan created by Hounsfield in '72 Using lots of X-rays and detector arrays that measure x-ray intensity A whole new scan the electrons start off in a tube they come from a heated source and then fly towards the anode that sends photons out to you the anode that sends photons out to you the xrays fly through your body attenuated by tissues bone or skin, fat or muscle affect xrays differently A whole new scan Don't you dare move around as the scanner moves around your head Hold your breath now, I'm serious beams that went through you now will be less intense because of what Beer's law has done to them A whole new scan detectors gauge intensity and now that, that is done here comes the fun of using math to visualize your brain A whole new scan A whole new scan The CT scan The CT scan Tomography that's what we'll use to see your brain "Back Projection" (to the tune of "Hakuna Matata") Back projection, it takes 1D arrays back projection, it uses many angles and then it smears them, into 2D matrices and then it rotates them; each one differently by their respective angles So what do you do now? We add ...



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