Computed Tomography Computed Tomography References References The Essential Physics of Medical The Essential Physics of Medical Imaging 2 Imaging 2 nd nd ed ed n . . Bushberg J.T. et.al Bushberg J.T. et.al Computed Tomography 2 Computed Tomography 2 nd nd ed ed n : Seeram : Seeram Physics of Radiology : Wolboarst A.B. Physics of Radiology : Wolboarst A.B.
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Computed Tomography References The Essential Physics of Medical Imaging 2 nd ed n. Bushberg J.T. et.al Computed Tomography 2 nd ed n : Seeram Physics of.
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Computed TomographyComputed Tomography
ReferencesReferences
The Essential Physics of Medical Imaging 2The Essential Physics of Medical Imaging 2ndnd ed ednn..
Direct Fourier Transform MethodDirect Fourier Transform Method
Iteration MethodIteration Method
Back Projection MethodBack Projection Method
Projection elements are divided uniformly Projection elements are divided uniformly amongst pixels in projection pathamongst pixels in projection path
Non zero activity outside the true location Non zero activity outside the true location of the objectof the object
Filtered Back ProjectionFiltered Back Projection
Acquire projection profiles at N projection Acquire projection profiles at N projection anglesangles
Do 1D FT of each profileDo 1D FT of each profile
Filter each k space profileFilter each k space profile
Inverse FT each filtered profile to obtain Inverse FT each filtered profile to obtain filtered profile in space domainfiltered profile in space domain
Back project the filtered profileBack project the filtered profile
FBP is the most widely used FBP is the most widely used reconstruction method in CTreconstruction method in CT
Image reconstructionImage reconstruction
Filtered back projection of the data Filtered back projection of the data corresponding to a single slice produces corresponding to a single slice produces the image of that slice.the image of that slice.
Repeating the above procedure for all Repeating the above procedure for all slices gives the 3D image.slices gives the 3D image.