We use them!!!!!!
When we want to introduce a radioactive "aerosol" into a patient's lungs to see the distribution (part of diagnosing pulmonary embolism PE ) one of the machines used forms bucky balls containing the radiopharmaceutical
Basically if the patient has defects in the blood supply (perfusion scan) that are not matched by the ventilation scan... the problem is a PE, or in this case from the Hrvard teaching files multiple!
If the defects match then it affects air and blood distribution, excluding PE