Bias in the Assessment of Computed Tomography Scans for Lacunar Infarction

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Abstract
Thirty neurologists and 30 radiologists volunteered to interpret three ambiguous CT scans for the presence or absence of a lacunar infarction in or near the internal capsule. The scans were accompanied – at random – by patient information that was either suggestive or non-suggestive of a stroke. One normal scan with suggestive patient information and four camouflage scans were added. Suggestive information significantly biased the interpretation of one of the ambiguous scans, whereas only a tendency towards bias was found in the others.

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