Ces radiol. 2011, 65(3):169-176

Iterative reconstruction of CT image - a revolutionary milestone in computed tomography?Review article

Jan Žižka
Radiologická klinika Lékařské fakulty Univerzity Karlovy a Fakultní nemocnice, Hradec Králové

The average radiation dose resulting from medical exposure continuously rises in the population. It has increased several times within the last three decades and reached the level of natural radiation background in some developed countries. Computed tomography is the major contributor, comprising two thirds of the entire cumulative medical exposure. To reverse this unfavourable trend attributed mainly to continuously increasing number of CT procedures, it is necessary to adopt adequate precautions. Among these, the most promising seems to be the technique of iterative reconstruction of CT image which significantly reduces image noise and therefore allows radiation exposure reduction by tens of percent.
The article deals with basic principles and types of iterative reconstruction which are already available on recent CT scanners, commenting on their advantages and disadvantages. Differences between iterative reconstruction and filtered back projection considered as "gold standard" on all CT scanners for more than three decades are also discussed.

Keywords: computed tomography, filtered back projection, iterative reconstruction, radiation dose

Accepted: June 15, 2011; Published: September 1, 2011  Show citation

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Žižka J. Iterative reconstruction of CT image - a revolutionary milestone in computed tomography? Ces radiol. 2011;65(3):169-176.
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