PET examination of the diagnostic significance of the tumor is: can be observed at the molecular level through cellular metabolic activity and accurate, timely show parts of the body and focus the organization and dynamics of the microstructure, for inspection and diagnosis of disease. Such as: Check the brain tumor, the 18F-fluorodeoxyglucose (18F-DG) into the body, and 2 – deoxyglucose binding in brain cell metabolism, brain cell metabolism and active, shows "red zone" or "white zone." After treatment, brain tumor cell death, and no metabolism, shows the "blue zone" or "black zone." Similarly, to check the site tissue is normal or abnormal.
PET in cancer diagnosis on the application:
1. The early diagnosis of lung, liver, stomach, gallbladder, pancreas, kidney, intestinal cancer, lymphoma, head and neck cancer, breast cancer and other gynecological cancers, and can be precancerous lesions. Before the formation of cancer, tissue and cell has changed, and the normal tissue is quite different, called precancerous lesions, but the element of CT or magnetic resonance, or other means can not be found, only the PET examination to diagnose.PET examination found abnormal, the early measures can be the "cancer" nipped in the bud.
2. To determine the tumor location, size, metastasis, for accurate and effective treatment.Tumor often was "crab claw-like growth", PET examination can clearly found that "crab claw" and the small foci.
3. Judge of cancer treatment, surgery is all clean cut? Radiotherapy, chemotherapy and other treatment, the effects? By other means is difficult to judge, CT and MRI is more advanced, but only after the end of the treatment of 6 – 8 months to appear, and PET examination in a few days then you can judge.
PET examination in the diagnosis of tumors of the significance of PET resolution of the range of 4 – 5mm, and can check the in vivo biochemical processes of living tissue, it can be the differential diagnosis of tumor recurrence or radiation necrosis.