1.   As they were thinking, their brain activity was monitored by PET scans.

2.   But only with the development of Positron Emission Tomography, or PET scans, have physicians been able to view chemical changes inside the body.

3.   But Schacter said it was probably farfetched to think of using PET scans, like those used in his research, in a trial.

4.   But repeated PET scans on the baboons revealed that the damage was not repaired over the following three months.

5.   In many ways, the true and the false recollections showed up in similar ways in the PET scans.

6.   Most recently, a study involving PET scans showed that the brain does indeed handle traumatic memories differently from the way it handles ordinary memories.

7.   Nor is another method, PET scans of the brain, as people run.

8.   On the positive side, PET scans can help doctors plan the amount of chemotherapy to give a patient, based on the rate the cancer has spread.

9.   Others said they saw no such effects and asked how good the PET scans were at showing the growth and proliferation of the fetal cells.

10.   PET scans show brain responses to nature videos and to videos of people taking drugs.