A streak artefact that may be seen on CT images, which is caused by computer errors related to abrupt changes in tissue density, as occurs in the interface between relatively low density of brain tissue to a high density of adjacent bone or in CT images of metal implants.
Beam-hardening artefact (BHA) is common in the posterior fossa and floor of the middle fossa and thus compromises imaging of lesions of the posterior brain, cerebellum and temporal lobes, making MRI the preferred modality for these regions. BHA can be corrected by using newer reconstruction algorithms.
Nucl. Med. Technol. December 2007 vol. 35 no. 4 213-225
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