Objective To explore in our country how to do a good job of radiation health protection for radio-subjects.Methods The people are divided into physical examination group and in & out-patient group,the radiation health protection status of the current domestic and foreign subjects are contrastively analyzed.Results The western developed countries radiology examinations have stronger sense of patient protection,but the prevalent problems are neglected and abused in domestic hospital.Conclusion The radiation health protection in healthy people and medical patients can be regarded and consummated,which is people-centered and can be strengthen radiological protection awareness,strictly implement radiation protection standards of hygiene and put an end to the indiscriminate seizure.

Objective To test image quality, accuracy of attenuation and scattering corrections of PET with NEMA NU2-2001. Methods By using NEMA IEC/2001 PET Phantom,along with the test methods recommended by NEMA NU2-2001, the PET image quality, accuracy of attenuation and scatter corrections were measured. Results Relative error in attenuation and scatter corrections were 0.25 (n=4) and 0.25 (n=8) respectively. Conclusion It's difficulty to prepare the phantom and process data. Preparing the phantom according to the radioactivity ratio strictly and processing data carefully even with many times, the exact result of the test can be obtained.

Purpose To investigate the diagnostic value of ~(18)F-flurorodeoxyglucose (~(18)F-FDG) PET/CT (positron emission tomography/computed tomography) on multiple myeloma.Materials and Method ~(18)FDG PET/CT imaging findings were retrospectively analyzed in 31cases with multiple myeloma proved by bone marrow aspiration or biopsy from August 2005 to June 2009. Results The PET/CT imaging characteristics were categorized into three types: ① osseous destruction (n=28): Osseous destruction with active metabolism was found in this type combined with no extramedullary organs involvement. The SUV_(max) ranged from 2.5 to 15.4, and the SUV_(arg) ranged from 2.0 to 11.3. ② Extramedullary organ involvement (n=2): Besides osseous destruction, extramedullary organs involvement were detected in this type demonstrating active metabolism in varying degrees. The SUV_(max) ranged from 2.2 to 8.3 and the SUV_(avg) ranged from 1.7 to 6.5. ③ Diffuse bone marrow infiltration (n=1): Diffuse hypermetabolism without osseous destruction was found in the whole body bone marrow with the SUV_(max) of 13.4 and SUV_(avg) of 8.8.Conclusions ~(18)FDG PET/CT can accurately demonstrate the morphology, extent and activity of multiple myeloma, thus facilitating the clinical staging, whereas multiple osteolytic osseous metastases and osseous lymphoma should be excluded for certain cases.