A written diagnosis of the employee's chronic silicosis (as defined
in Sec. 30.5(j)) shall be made by a medical doctor and accompanied by:
(a) A chest radiograph, interpreted by an individual certified by
the National Institute for Occupational Safety and Health as a B
reader, classifying the existence of pneumoconioses of category 1/1 or
higher;
(b) Results from a computer assisted tomograph or other imaging
technique that are consistent with silicosis; or
(c) Lung biopsy findings consistent with silicosis.