A backprojection filtering algorithm for a spatially varying focal length collimator.

Abstract:

:Fan-beam collimators are used in single photon emission computed tomography to improve the sensitivity for imaging of small organs. The disadvantage of fan-beam collimation is the truncation of projection data surrounding the organ of interest or, in those cases of imaging large patients, of the organ itself producing reconstruction artifacts. A spatially varying focal length fan-beam collimator has been proposed to eliminate the truncation problem and to maintain good sensitivity for the organ of interest. The collimator is constricted so that the focal lengths of the holes vary across the face of the collimator with the shortest focal lengths at the center and the longer focal lengths at the periphery of the collimator. The variation of the focal length can have various functional forms but in the authors' work it is assumed to increase monotonically toward the edge of the collimator. A backprojection filtering reconstruction algorithm is derived for this type of collimation. The algorithm first backprojects the projections, then performs a two-dimensional filtering. The algorithm is efficient and has been tested via computer simulations.

journal_name

IEEE Trans Med Imaging

authors

Zeng GL,Gullberg GT

doi

10.1109/42.310886

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

549-56

issue

3

eissn

0278-0062

issn

1558-254X

journal_volume

13

pub_type

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