Objective To investigate the FDG PET-CT image characteristics of bone metastases from lung cancer and the clinical value of 18F-fluorodeoxyglucose(FDG)PET-CT for diagnosis to bone metastases from lung cancer.Methods 32 cases of bone metastasis from lung cancer examined by FDG PET-CT had been studied.All of them were proved by pathology after operation or biopsy.Their FDG PET-CT diagnosis were analyzed by comparing with CT diagnosis. Results All of 115 lesions of 32 cases showed intense uptake of 18F-FDG. SUV mean was 7.47±3.48. 115 lesions located in 42 pieces of bones. Most importantly.16 lesions of occult bone metastases of 12 cases were found.The most related bone were ribs(26/115,22.61%),thoracic vertebral(21/115,18.26%),iliac bone(18/115,15.65%)and lumbar vertebral(16/115,13.91%).96 lesions(83.48%)showed lytic type on CT images,1 lesion(0.87%)showed sclerotic type,and 2 lesions(1.74%)showed mixture type.Conclusion The FDG PET-CT can early detect bone metastases from lung cancer.show their exact location,and have superiority in the screen of bone metastases from lung cancer.

Objective To assess the cli ni cal usefulness of dual-modality positron emission tomographic (PET)-computed t omographic (CT) imaging in pulmonary lesions. Methods Fo rty-nine patients with pulmonary lesions examined with ?~2 test. Results There were 50 primary lesions in 49 patients. Accuracy, sensitivity, specificity, positive predictive value (PPV), and negative predict ive value (NPV) were 90.0%, 95.2%, 62.5%, 93.0%, and 71.4%, respectively wi th PET-CT, 74.0%, 76.2%, 62.5%, 91.4%, and 33.3%, respectively with CT. There was significant differences between them (P0.05). Conclusion PET-C T has an important clinical value in differentiating benign lesion from malignan cy and staging in lung cancer.

Objective To compare the diagnostic value of PET-CT and bone scintigraphy in bone metastases. Methods Thirty-two patients with malignant neoplasm confirmed by pathology were undergone18F-FDG PET-CT and bone scan within two weeks.The sensitivity,specificity and accuracy of PET-CT and bone scan in detecting the focus were compared at the same scan filed.Results The diagnostic sensitivity,specificity and accuracy with PET-CT were 94.9%,91.7% and 94.1%,respectively,and 96.2%,54.2% and 86.3% with bone scan,respectively.18F-FDG PET-CT and99Tcm-MDP bone scan were the same in detecting metastatic tumor of bone,but the specificity of18F-FDG PET-CT was better than99Tcm-MDP bone scan in detecting bone metastasis.Conclusion Compared with99Tcm-MDP bone scan,18F-FDG PET-CT is more specific and helpful in detecting bone metastases.