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View sampling requirements in fan beam computed tomography
Author(s) -
Joseph Peter M.,
Schulz Raymond A.
Publication year - 1980
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594723
Subject(s) - streak , imaging phantom , scanner , traverse , beam (structure) , image resolution , computed tomography , iterative reconstruction , optics , physics , resolution (logic) , tomography , computer science , computer vision , artificial intelligence , geology , radiology , medicine , geodesy
It is known that good CT reconstructions require that many views of the scanned object be obtained, where each view consists of many rays which traverse the patient. It is known that the required number of views depends on the diameter of the region reconstructed and the spatial resolution achieved. We present a new analysis of this question, valid for reconstructing from fan beam views, which shows that larger fan angles will require more views. Computer simulations, using a fan beam reconstruction algorithm, confirmed the predicted fan angle dependence and demonstrated that streak artifacts will result if too few views are used. The effect is also demonstrated experimentally by a phantom scan on a clinical CT scanner. Implications for clinical CT scanning are discussed.