Abstract：
:A new class of acquisition schemes for helical cone-beam computed tomography (CB-CT) scanning is introduced, and their effect on the reconstruction methods is analyzed. These acquisition schemes are based on a new detector shape that is bounded by the helix. It will be shown that the data acquired with these schemes are compatible with exact reconstruction methods, and the adaptation of exact reconstruction algorithms to the new acquisition geometry is described. At the same time, the so-called PI-sufficiency condition is fulfilled. Moreover, a good fit to the acquisition requirements of the various medical applications of cone-beam CT is achieved. In contrast to other helical cone-beam acquisition and reconstruction methods, the n-PI-method introduced in this publication allows for variable pitches of the acquisition helix. This additional feature will introduce a higher flexibility into the acquisition protocols of future medical cone-beam scanners. An approximative n-PI-filtered backprojection (n-PI-FBP) reconstruction method is presented and verified. It yields convincing image quality.
journal_name
IEEE Trans Med Imagingjournal_title
IEEE transactions on medical imagingauthors
Proksa R,Köhler T,Grass M,Timmer Jdoi
10.1109/42.887834subject
Has Abstractpub_date
2000-09-01 00:00:00pages
848-63issue
9eissn
0278-0062issn
1558-254Xjournal_volume
19pub_type
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