Objective:Through 51 SPECT and SPECT/CT systems for performance test results of the collation and analysis, to understand the status of the operation of the SPECT and SPECT/CT systems, and in-depth analysis of indicators and find out the weak links and puts forward suggestions for improvement. Methods:According to the NEMA standards and requirements of the manufacturer, the systems have been tested on intrinsic uniformity, intrinsic spatial linearity, intrinsic spatial resolution, maximum count rate, system sensitivity, system spatial resolution and tomographic spatial resolution. Results:The results show that the majority of SPECT or SPECT/CT systems can pass the test;the failure rate is 9.80%. And the failures mainly show intrinsic uniformity and intrinsic spatial linearity. Conclusion:It is effective to improve the equipment performance by doing well in the daily quality control, regular maintenance and calibration, reducing factors that influence the inherent uniformity and inherent linear.

Objective To analyze the influence factors on, and the relationship between, the system performance parameters by testing SPECT equipment.Methods By reference to National Electrical Manufactures Association standards and manufacturer's specifications, the performances of a total of 31 SPECTs in 12 provinces were measured, for the first time, with regard to their system spatial resolution (SSR) , system planar sensitivity (SPS) and tomographic spatial resolution (TPR).Results The results were as follows: (7.90 ± 0.62) mm for SSR, with the highest 9.46 mm and the lowest 7.04 mm;(78.54± 13.17)s-1· MBq-1 for SPS, with the highest 123.80 s-1 · MBq-1 and the lowest 56.70 s-1·MBq-1;and (13.12 ± 2.59) mm for TSR, with the highest 18.13 mm and the lowest 8.45 mm.These values indicated a nearly consistent upward and downward trend and could meet the clinical requirements by comparison with the manufactuer' s specifications.Conclusions Mutual restrictions have been shown between SSR and SPS.Increased thickness of the system crystal plane can improve the SPS, but also has a negative impact on the SSR.For all the above reasons, it is the optimum solution to choose the right type of collimator and crystal thickness for different clinical applications.

Objective:It is to discuss results and significance of PET/CT in the performance tests.Methods: According to NEMA NU 2-2007 Performance Measurements of Positron Emission Tomographs and GB 17589-2011 specifications for quality assurance test for computed tomography X-ray scanners standards, with phantoms of nuclear medicine and CT, performance testing was done.Results: Spatial Resolution (FWHM): transverse 1 cm 4.16 mm, axial: 1 cm 4.04 mm, transverse 10 cm 4.92 mm, axial: 10 cm 5.74 mm. Sensitivity: 9.6 s-1·kBq-1, scatter fraction: 35.4%, peak NEC rate: 1.69×105 s-1.Conclusion: According to manufacturers and national standards, the results of performances testing are up to standard. It is necessary to enhance the effect of in quality control(QC) of PET/CT and the fundamentality of the performance tests, so that the devices come to the demands for clinical practice.

Objective To study the chemical components of Anemarrhenae Rhizoma;To establish a method to determine the content of vitexin;To compare the content difference of vitexin from Anemarrhenae Rhizoma before and after salt processing. Methods 70% ethanol extract of Anemarrhenae Rhizoma was separated and purified by silica gel column chromatography technique, and compound was identified by physicochemical properties and spectral data. HPLC was used with Ecosil column (4.6 mm×150 mm, 5μm), mobile phase of acetonitrile-0.2%acetic acid solution (14.5∶85.5), velocity of 1.0 mL/min, and determine wavelength of 340 nm. Results The compound was vitexin, a good linearity (r=0.999 8) in the range of 0.039 8-1.99μg. The average recovery rate was 98.02%, RSD=0.21%. Vitexin content was 0.008 5% in crude Anemarrhenae Rhizoma, 0.008 1% in processed products. Conclusion This is the first time separation of vitexin from Anemarrhenae Rhizoma. The method for content determination of vitexin is accurate, specific, and highly sensitive in the present experiment. Content of vitexin decreases slightly in processed products of Anemarrhenae Rhizoma compared with crude Anemarrhenae Rhizoma.

Objective To observe the pathology in temporal lobe cortexes and hippocampus in protopathic intractable temporal lobe epileptics.Methods The cortexes of spike foci in temporal lobe and hippocampus were obtained from 9 cases with protopathic intractable temporal lobe epilepsy who accepted operation.The samples were observed under the transmission electron microscope.Results The ultrastructure changes in spike focus of temporal lobe cortexes are similar to those in hippocampus.It is common that neurons were pycnotic and decreased.Astrocytes were hydropic and degenerative.Gliosis were found in some cases.The number of synapses increased or decreased in different cases and positions.Blood-brain barriers were destroyed because foot processes of astrocytes around capillaries were edematous.Conclusion Neuronal loss,gliosis and synaptic reorganization which occur in epileptic hippocampus and maybe also in epileptic temporal lobe cortexes destroy the balance between excitatory and inhibitory neurotransmission.The abnormalities probably associate with protopathic intractable temporal lobe epileptic seizures.

Adult ; Balloon Occlusion ; instrumentation ; Cardiac Catheterization ; instrumentation ; Ductus Arteriosus, Patent ; surgery ; Female ; Humans ; Ligation ; instrumentation ; Recurrence

Female ; Humans ; Obesity ; complications ; Polycystic Ovary Syndrome ; complications ; therapy

iple occurrence of the tumor, which can decline its recurrence and postpone its progression.

Objective To evaluate the relationship of metabolic syndrome (MS) and MS components with thyroid nodule. Methods A total of 10 357 subjects ( age ＞ 18 years old) who received physical checkup at the Second Affiliated Hospital of Dalian Medical University between June 2009 and June 2010 were enrolled in this retrospective study. Anthropometric parameter, fasting plasma glucose (FPG),serum lipid profile, blood uric acid, alanine aminotransferase and thyroid ultrasonography were measured. Results The prevalence of thyroid nodule,MS,and thyroid nodule + MS was 46. 96% ,23. 6%,and 11.6%, respectively. The prevalence of thyroid nodule was significantly higher in MS patients than in non MS patients ( 75.9% vs 38. 0%, P ＜ 0. 05 ). Multifactor logistic analysis showed that MS, body mass index (BMI) and FBG (β vales were 0. 78,1.22,and 0. 62,respectively; odds ratios were 4. 167,3. 876,and 2. 359, respectively; all P ＜ 0. 05 ) were independently correlated with the development of thyroid nodule. Conclusions Significantly increased prevalence of thyroid nodule could be found in MS patients. BMI and FBG may be independent risk factors of thyroid nodule.

Objective To observe the clinical effects of eyehd reconstruction by regional flap combined with xenogeneic acellular dermal matrix transplantation for eyelid defect after malignant tumor excision.Methods Thirty-five cases (35 eyes) in our hospital were selected as the objects.Among them,basal cell carcinoma was 21 cases,meibomian gland carcinoma was 13 cases,squamous cell carcinoma was 1 cases;12 cases of upper eyelid and 23 case of lower eyelid were involved.All patients were subjected to intraoperative frozen,and the incision margin was determined according to the frozen results.After resection of the tumor,the eyelid had full-thickness defects in different degrees.The xenogenic acellular dermal matrix was used to replace the conjunctival tarsal tissue,and the adjacent flap or transposition flap was used to repair the eyelid defect according to the size of skin defect.The healing of flap,oral repair film,eyelid closure and adhesion were observed.Results After half a year follow-up,the acellular dermal matrix were completely dissolved by crawling the conjunctival epithelium covering,the flap healed with no flap necrosis.28 patients recovered well after operation without hypophasis and entropion,ectropion.4 patients had mild hypophasis,and there was no case of exposure keratitis.3 patients were with mild symblepharon.Conclusion The acellular dermal matrix can replace tarsal conjunctival tissue,which combined with regional flap has good clinical curative effect for eyelid defect after malignant tumor excision.This treatment can reduce the pain of patients who take oral mucosa and avoid the reoperation of eyelid reconstruction.