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1.)List and explain the two methods used to obtain the two energy xray spectra required in...

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Electrical Engineering

1.)List and explain the two methods used to obtain the two energyxray spectra required in DXA?
2.) Explain the concept og back projection method used incomputed tomography?
3.) What are meant by ‘window level’ and ‘window width’

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3.9 Ratings (492 Votes)
1 Two method of generating DXA have been implemetned usingeigther Kedge filters or kVp swichingKedge filtersKedge absorption filters made of rare earth material such ascerium and samarium are ued to split the polyenergetic Xray baminto high and lowenergy components that mimc the emision from Gdthe 2 component have inherently narrow spectra distribution andhence the problems associated with beam hardening are minimizedLunar DPX Lunar Corp Madison system have a cerium filter and usepulse height analysis at the detector to discriimntate between highand low energy    See Answer
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