Cal. Health & Safety Code § 115113
(a) Except for an event that results from patient movement or interference, a facility shall report to the department an event in which the administration of radiation results in any of the following:
(1) Repeating of a CT examination, unless otherwise ordered by a physician or a radiologist, if one of the following dose values is exceeded:
(2) A CT X-ray examination for any individual for whom a physician did not provide approval for the examination if one of the following dose values is exceeded:
(3) A CT X-ray for an examination that does not include the area of the body that was intended to be imaged by the ordering physician or radiologist if one of the following dose values is exceeded: