Objective:To evaluate the diagnostic value of PET/CT fusion images in the research field of metastatic tumors of the body by the comparison of CT

SPECT or PET images.Methods:The analysis was based on 19 cases with 60 metastatic lesions.The final diagnoses were confirmed by surgery

biopsy and pathology.CT

SPECT or PET and PET/CT were applied in all cases.CT scanning was applied in 19 cases.Among them

there were 9 plain examinations

and on the basis of that

the other 10 cases were applied enhancement scanning.SPECT was applied in 11 cases.Among them

there were also another 8 cases which were applied PET.Combined PET/CT examinations were performed in 19 cases.PET/CT was separately compared with CT

SPECT or PET findings

and the its numbers

localization

size

the distrubution of radionuclide

the involvement of lymph node and local swelling of soft tissues of the lesions were recorded.Results: There were 9 cases of pulmonary metastasis and the detective rate of PET/CT was 100%(29/29 cases)

SPECT or PET 86.2%(25/29 cases)

CT 82.8%(24/29 cases);7 cases of spine metastasis and the detective rate of PET/CT was 100%(17/17 cases)

SPECT or PET 88.2%(15/17 cases)

CT 76.5%(13/17 cases);3 cases of hepatic metastasis

and the detective rate of PET/CT was 100%(14/14 cases)

SPECT or PET 71.4%(10/14 cases)

CT 78.6%(11/14 cases)respectively.Conclusion:The shape and anatomic position of metastatic lesion can be clearly detected on CT image;nuclear medicine images such as SPECT

PET can provide excellent information on functional biology.Referring to PET/CT

it is a very useful method in detecting lesions of the shape and construction

and it can also provide more functional information

localization and characterization of metastatic lesion

PET/CT image can differentiate physiologic uptake

and meanwhile promote the differentiation of its physiologic intake.