1.   A chest radiograph was normal, but a ventilation-perfusion lung scan showed a matched defect in the right lower lobe.

2.   Lung perfusion scan was normal.

3.   But as the lung scans are being promoted, one gap in the logic remains.

4.   Doctors usually do a lung scan as a screening test and, depending on the results, may do a special x-ray test known as a pulmonary angiogram.

5.   Kramer is optimistic that once the uncertainties of the lung scan are explained, people will volunteer for the study.

6.   Rosen is starting a study of whether patients who view their own lung scans quit smoking as often as those who enroll in traditional stop smoking programs.

7.   The fluid, Amerscan Pulmonate II, is injected into patients requiring a lung scan and enables doctors using special equipment to get a picture of the lungs.