Application of ^18F-fluorodeoxyglucose Positron Emission Tomography in Diagnosis of Malignant Diseases

Objective To testify the efficacy of ^18F-fluorodeoxyglucose （^18F-FDG） positron emission tomography （PET） in the diagnosis of cancer. Methods A total of 170 patients with diagnosed cancer or suspicious cancer were enrolled in this study, and underwent ^18F-FDG PET. The standard uptake value （SUV） and diameter for each abnormal region in PET images were analyzed. All data were analyzed by SPSS 11.5. Results PET scan identified a primary cancer in 45.8% （11/24） patients. The sensitivity and specificity of PET scan in differentiating malignant lesions from benign ones were 78.8% （52/66） and 77.1% （27/35） respectively. Twenty-nine out of 68 （42.6%） lesions were detected earlier by PET than by computed tomography. The SHV of primary cancer was significantly higher than that of metastatic lymph nodes （5.84± 3.12 vs. 3.14± 2.24, P〈0.001）. And SLIV of primary lung cancer was also significantly higher than that of metastatic lung cancer （6.30±3.01 vs. 2.86±2.37, P〈0.01）.Conclusion ^18F-FDG PET plays a very important role in cancer diagnosis.