Factors Affecting the Use of Quantitative Information from a CT Scanner

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Abstract
Computed tomography [CT] is used quantitatively in a variety of ways in both diagnosis and therapy [for humans]. The successful use of CT numbers depends on the appreciation of several features of CT scanning, including the diagnostic viewer. It is also possible to employ the quantitative output of a CT scanner to improve the accuracy of isodose curve computations for photon (or electron) beam radiotherapy. A quality-control program is mandatory for anyone wishing to use CT numbers for this purpose.