Husband exposed to asbestos 25 -30 yrs ago. he is haves scaring of lungs can asbestos be found with xrays, mri's, or cat scans?

No: Asbestos will not be found in his body, but the overall aspect of his lungs as revealed by the tests that you mentioned may become attributable to previous asbestos exposure. A pulmonary consult may help in better understanding his condition.

Yes...: ...it can.It's called 'asbestosis'if it's gotten to the point of symptoms and x-ray findings.A biopsy clinches the diagnosis but is not usually necessary if there has been a significant exposure (like at work-shipbuilding insulation or construction-over several months). It can also cause lung cancer so this needs to be evaluated by a doctor, probably a pulmonologist,who'll do function studies,etc