Abstract
A test for CT scanner laser-light alignment is described. Ready-pack film is taped around a cylindrical phantom, and laser-light position relative to x-ray beam track is indicated by an arrangement of pin pricks through the film jacket. Performance of this test after x-ray tube replacement showed a band of stray radiation running parallel to the scan beam. The errant beam was caused by a failure to interlock the prepatient collimator and scatter shield correctly.
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