Patient dose in multislice CT: why is it increasing and does it matter?

P Dawson
2004 British Journal of Radiology  
A brief review is presented of the reasons why multislice spiral/helical CT is associated with a higher radiation dose burden to the patient even than incremental CT. These include both intrinsic technological and geometric factors as well as simply a growing use of CT in an increasing number of applications. The typical magnitude of this dose burden is indicated and the basis for the anxiety that underpins it, namely the linear nothreshold (LNT) hypothesis, is discussed, together with the
more » ... ervailing hypothesis that there is indeed a threshold for radiation harm in man and that the radiation doses associated with CT may lie below this threshold and may even be beneficial (radiation hormesis). There are as yet no certainties in this important area but it is argued that it is not a given that the doses associated with CT are harmful.
doi:10.1259/bjr/23162044 pmid:15546836 fatcat:vzdf7v6w7bddrcdeqomhqbxk7u