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  • 28 June 2016 Volume 25 Issue 3
      
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  • Study on Radon and Its Progeny Level and Influencing Factors in Sunlight Greenhouses
    HOU Chang-song, ZHANG Qing-zhao, CUI Hong-xing, SHANG Bing
    2016, 25(3): 257-260. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.001
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    Objective Analysis of the concentrations of radon, radon progeny and PM2.5 in the sunlight greenhouse. Methods The concentrations of radon, radon progeny and PM2.5 in three sunlight greenhouses in Beijing area were measured by radon and progeny measurement instrument, electret detector and particle concentration measurement instrument. Results The results showed the average radon concentration CRn was (135±41.9) Bq/m3,(43.1±8.9) Bq/m3 and (45.5±15.9) Bq/m3(n=12,28.1~169 Bq/m3). Indoor PM 2.5 concentration range was from 28~248 μg/m3. Conclusion Radon progeny concentration Cp was significantly correlated with PM 2.5 concentrations indoor and outdoor. The fog and haze weather cause Cp increased in the air, then F value increased. The mean F value in sunlight greenhouse and the control room was 0.62±0.13(n=24,0.42~0.94) and (0.61±0.16) (n=22,0.36~0.94), it is significantly higher than the 0.40 typical values of the world. Soil is an important source to sunlight greenhouses. Radon concentration inside is related to the exposure of soil.
  • Discussion on Monitoring of Pulsed X-ray Radiation Field
    ZHOU Feng, LIU Chang-jun, XIANG Yuan-yi, LU Jian-feng, ZHU Yi-ting, YANG Yang
    2016, 25(3): 261-264. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.002
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    Objective To understand the applicability in pulse radiation field of the instrument which is used for measuring stability of natural radiation field and study of pulse radiation field measurement method. Methods To deduce the problems in the pulse radiation field of a dose rate meter by its measurement principle, the measurement results of the common type detector in the pulse field are given. Results When the instrument which is used for measuring stability of natural radiation field measures pulse transient field, the measurement data are usually low. Conclusion The actual monitoring must be base on strengthening the dose monitoring. It is necessary to develop a device to measure the dose rate of the pulse radiation field in order to guarantee the rationality and reliability of the data.
  • Analysis in Dose Control Level of Emergency Workers in a Nuclear or Radiological Emergency
    FU Xi-ming, YUAN Long
    2016, 25(3): 265-268. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.003
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    Objective To analyze the dose control level of emergency workers in a nuclear or radiological emergency. Methods According to the safety standards and technical reports issued by the International Atomic Energy Agency (IAEA) and combined with lessons learned from response to Fukushima nuclear accident, the dose control levels of emergency workers are discussed. Results The guidance values for restricting exposure of emergency workers and methods for dose control of emergency workers are provided. It is found that monitoring of internal dose is important in dose control. The newly published IAEA safety standard "Preparedness and Response for a Nuclear or Radiological Emergency" improves the guidance values for restricting exposure of emergency workers, the standard in China needs to be revised. Conclusion It is suggested that the dose control level of emergency workers in China be revised by referring to the IAEA newly published standard and taking into account the special conditions in China, in order to protect emergency workers.
  • Clinical Value of Collioid Chromiun 32P Combining Pingyangmycin to Treat Deep Subcutaneous Hemangioma of Infants
    XIAO Huan, PAN Wei-min, YAN Wei-wen, XIE Quan, CHEN Hong-yan
    2016, 25(3): 269-272. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.004
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    Objective To explore the clinical value of Collioid Chromiun Phosphate-32 combining pingyangmycin to treat deep subcutaneous hemangioma of infants by injection. Methods 62 subcutaneous hemangioma in 41 infants were selected and treated by Collioid Chromiun Phosphate-32 combining pingyangmycin. The volume of hemangioma was calculated by color Doppler ultrasound inspection. And the hemangioma was then injected 5.55~9.25×108 Bq(15~25 μCi/cm3) Collioid Chromiun Phosphate-32 (with total dosage no more than 1.85×107 Bq(0.5 mCi) for each child) and 150~250 μg/cm3 pingyangmycin(with total dosage no more than 4mg for each child). Results 41 infants was conducted injection with each one injected 1~3 times. On average for the 61 hemangioma, 1.58 injections were done on each one. And the average treatment time was 6 months. The total effective rate was 98.4%. and no systematic or serious local complications were found among all infants within a 5-year follow-up. Conclusion Colloid 32 phosphoric acid chromium joint pingyangmycin has a curative effect on deep infant skin hemangioma. Giving corresponding education can improve the cure rate.
  • Protective Effect of Cerium Oxide Nanoparticles on Mice Induced by γ-rays
    WANG Chun-yan, LI Ning, TONG Peng, GOU Qiao, TIAN Mei, SHAO Shuai, LI Chen, QU Gong-lin, QI Xue-song
    2016, 25(3): 273-276. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.005
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    Objective To investigate the protective effect of cerium oxide (CeO2) nanoparticles on mice induced by γ-rays. Methods 140 BALB/c mice were randomly divided into normal control group, irradiation control group, positive control group treated with amifostine, low dose group treated with 100 mg/kg of CeO2 nanoparticles, medium dose group treated with 300 mg/kg of CeO2 nanoparticles and high dose treated with 900 mg/kg of CeO2 nanoparticles. Mice were induced by 3.5 Gy of 60 Co and dose rate was 1 Gy/min. Mice were sacrificed three days and eight days after irradiation, spleen and thymus index, micronucleus rate of bone marrow polychromatic erythrocytes were examined as well as blood serum SOD and actin cytoskeleton in thymus lymphocytoplasm eight days after irradiation. Results Three days after the irradiation, compared with the irradiation control group, the thymus index significantly increased in medium dose and high dose group (P<0.05 or P<0.01), it's better than that of positive control group. The spleen index increased with the increase of dose of CeO2 nanoparticles, but the difference was not statistically significant. Micronucleus rate of bone marrow polychromatic erythrocytes decreased in each CeO2 nanoparticles administration group, and the significant difference was found in low dose group (P<0.05), it's better than that of positive control group. Eight days after the irradiation, compared with the irradiation control group, Micronucleus rate of bone marrow polychromatic erythrocytes in CeO2 nanoparticles administration groups decreased. Compared with the irradiation control group, in CeO2 nanoparticles medium dose group, there was a tendency of increase of blood serum SOD activity, but the difference was not statistically significant, and actin cytoskeleton was more clear and complete. Conclusion CeO2 nanoparticles have a certain anti-radiation activity, it may be related to the immune capacity improvement and the hematopoietic tissues protection from the damage induced by radiation.
  • Preparation of Monoclonal Antibodies and Immunoradiometric Assay Kit Against Squamous Cell Carcinoma Antigen and its Clinical Value in Diagnosis of Cancer
    WANG Li-kai, DONG Quan-wen, PAN Xue-ji, HUANG Li-juan, ZHANG Xu
    2016, 25(3): 277-279. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.006
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    Objective To prepare monoclonal antibodies and immunoradiometric assay kit against Squamous Cell Carcinoma Antigen (SCCA) and study its clinical value in diagnosis of Cervical cancer and lung squamous cell carcinoma. Methods With immune BALB/c mice with recombinant SCCA antigen, monoclonal antibodies were generated through splenic cell and myeloma cell fusion and screening, and immunoradiometric assay kit for SCCA was developed with 2 paired Mc Antibodies. And its sensitivity and clinical value in diagnosis of Cervical cancer and lung squamous cell carcinoma were evaluated. Results 2 paired monoclonal antibodies with high affinity and high specialty were screened and immunoradiometric assay kit for SCCA was prepared. The detected sensitivity of the kit is 0.08ng/mL, and its clinical sensitivity for Cervical cancer and lung squamous cell carcinoma was 92.24% and 89.52% respectively, specificity was 98.75%. Conclusion This immunoradiometric assay kit for SCCA has high sensitivity and specificity in detection of Cervical cancer and lung squamous cell carcinoma and could be used in clinical diagnosis.
  • Analysis and Investigation of Radiological Health Continuing Medical Education
    XI Cong, WANG Hong-tao, WANG Xiao-kan, HAN Yan-qing, FAN Yao-hua
    2016, 25(3): 290-292. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.010
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    Objective To analyze and investigate the implementation of national continuing medical education(CME) programme by National Institute of Radiological Protection, Chinese Center for Disease Control and Prevention from 2005 to 2015, and to improve the quality of CME. Methods According to the archived CME data from 2005 to 2015, Excel 2010 and SPSS 19.0 were utilized to analyze the authorized and executed programme data.Results All projects approved were conducted from 2005 to 2015 with the execution rate of 100.00%. Most project duration were 4-6 days. Teachers who had senior professional titles gained 89.66% (390/435). The majority (68.10%, 5383/7904) of students had junior and intermediate technical titles; professional title distribution of students in different years were not exactly the same(χ2=61.06,P=0.000), junior and intermediate technical titles accounted for the most proportion. The percentage of students with bachelor degree was the largest. Students were satisfied with the progressiveness of training content. Conclusion Implementation of projects is overall good from 2005 to 2015, which contribute a lot to strengthen the foundation of national radiological health and radiation emergency. response. In the future, it is essential to enhance surveillance and evaluation to improve project quality.
  • The Problems and Countermeasures for the Radiological Protection of 30 Medical Institutions
    LI Shan-hui
    2016, 25(3): 294-296. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.012
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    Objective To understand the problems in the radiological protection work of the 30 medical institutions, and try to give the countermeasures. Methods By arranging, classifying and analyzing the on-site audit materials and rectification opinions for examining the "Radiation therapy license" of 30 medical institutions. Results The licensed rates of X-ray imaging diagnostic equipment, nuclear medicine, interventional radiology equipment, radiation therapy equipment and nuclide were 69.26%、60.61%、67.88%、68.18%、86.92% respectively. From 2011 to 2013, the state detection rates of radiological equipment were 75.04%, 73.26% and 75.43% respectively. The rates of occupational health examination, prevention education, and personal dose monitoring and licensed radioactive workers were 95.07%, 88.07%, 97.13% and 88.07% respectively. Substandard ratio of the medical institutes of protection equipment, warning marks and mode indicator light are 70.00%, 60.00% and 50.00%. Conclusion In the 30 medical institutions, some of the radiological equipment were used without permission and state detection; some of radiation workers didn't have conduct training or went on their post without certification; part of the protective equipment, warning marks, and mode indicator light are not standard, etc. We have put forward countermeasures for improvement.
  • Analysis of the Abnormal Dose in Personal Dose Monitoring Results of some Radiation Workers in Beijing Military Hospital from 2012-2014
    ZHANG Lei, WANG Xing-gong, QI Li-hua, WANG Qiang, AN Dai-zhi, LIU Xue-lin
    2016, 25(3): 301-303. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.014
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    Objective To summarize and analyze the abnormal dose in personal dose monitoring results of some radiation workers in Beijing military hospital during the period of 2012-2014. Methods By investigating radiation workers sampled from 3 Three-A military hospitals(A、B、C) and monitoring by thermo-luminescence dose monitoring method for statistical analysis of the results. Results According to the finding, among a total of 4986 person times of monitoring conducted during 2012-2014, dose is abnormal for 31 person times, whose values are mainly concentrated in a range of 1.25~5 mSv; abnormal dose is the most in C Hospital for person times, a total of 19,accounting for 61.29% of the 3 hospitals'total. In terms of different types of work, abnormal dose has the largest number of person times in nuclear medicine, a total of 21, accounting for 67.74% of the total. In this investigation,abnormal dose is caused due to 5 major reasons including heavy workload, staying in the operating room, intentional exposure, incorrect wearing position, and wearing no personal protective devices. Conclusion It is concluded that the authenticity and accuracy of monitoring data can be ensured only by improving the protection awareness of radiation workers, improving the administrators'knowledge on radiation protection, and making use of regulatory means in a scientific way.
  • Protection Level from CT Examination and Influential Factors in Shandong Province
    YANG Ke, LIU Yi, ZHANG Wei, YU Xi-rong, LI Lian-bo, ZHANG Xian-peng, XIA Chun-dong
    2016, 25(3): 316-318. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.021
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    Objective To understand the radiation level outside CT room, distribution of protection measurements and influential factors in Shandong Province, and put forward the suggestions to the existing problems for promoting its rationalization. Methods According to Radiological protection requirements for X-ray computed tomography (GBZ 165-2012) and Requirements for radiological protection in medical X-ray diagnosis(GBZ 130-2013), the radiation level outside CT room was tested and protection measurements of CT was inspected in Shandong Province. Results In general, compared with the first survey, the mean absolute difference is 0.95 μSv/h, decreased by 76.6%,particularly, decreased by 82.3% for Pb window in CT room; in addition, the two surveys show that the lowest radiation level outside of CT examination room are from operating position of staff and wall. Conclusion The radiation level outside CT room is significantly improved in Shandong Province, especially, and mean dose value from the partial position of CT room has reached the level of natural background radiation in the second survey. Meanwhile, there is still some space to decline for mean dose from the other partial position of CT room and allocation of protection measurements.
  • Measurement of External Radiation Level in the Process of 131I-Treated Thyroid Carcinoma Patients
    GU Xian-bao, YU Guo-bing, DU Qin, LI Fei, CHEN Zhi, TAN Hua-yan, ZHANG Xiao-cheng
    2016, 25(3): 319-321. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.022
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    Objective To measure the spatial distribution of radiation field and how it changes over time in the process of therapy thyroid carcinoma with 131 I,and also to offer a meaningful reference for the shielding design of ward and radiation environment management of related projects. Methods Active measurement combining with the passive measurement. Results The radiation dose rate of the position 1 meter in front of the patients'chest reached 393 μGy/h after taking the drug for 5 minutes. And the dose rate attenuated significantly with the increase of treatment time. During the whole treatment, the cumulative dose generated from patients to the nearest monitoring point was 2.6 mSv. For each cumulative dose monitoring points in the ward, dose generated in the first 24 hours was 57%~80% of the total dose generated in the entire treatment process; dose generated in the first 48 hours accounted for 80%~95%; but the dose later only contributed a little part to the total dose. Conclusion The measurement results have a good reflection of the source intensity and distribution of the radiation field in the whole 131 I therapy for differentiated thyroid carcinoma metastases.
  • Estimate of Radiation Safety of X-ray Coating Thickness Analyzer
    HUA Zheng-dong
    2016, 25(3): 338-341. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.030
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    Objective Taking BOWMAN BA-100 X-ray coating thickness analyzer for example,the rate of ambient dose equivalent outside the X-ray coating thickness analyzer was studied. Methods The rate of ambient dose equivalent outside the X-ray coating thickness analyzer was measured using detector of 6150 AD b-H. The scattering coefficients of the X-ray normal incidence on the material of aluminum, iron, copper and lead were given using the EGS Monte Carlo, respectively. Results The results of ambient dose equivalent rate and scattering coefficients were given based on measurement method and Monte Carlo method. Conclusion In radiation safety assessment of X-ray coating thickness analyzer, in addition to the X-ray tube voltage, tube current and target material were key parameters, the collimating aperture, scattering medium, scattering angle and size of radiation field were also crucial.
  • An Estimation Method of Dose Rate in the Containment under the Accident Operating State
    LI Sheng, HUANG Yue, CHEN Yan, LIN Chang-yong, LI Jing-shan, CHEN Wei, LIU Bin
    2016, 25(3): 342-344. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.031
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    Objective To provide speculate the size and development trend of accident, prevent the expanding of accident and protect the public radiation safety by estimating the dose rate in the containment within the period of LOCA. Methods This work is on the basis of safety analysis report of some domestic nuclear power plant and actual condition of LOCA accident emergent manoeuvre to bring forward MCNP coupling calculation method of operating condition sequence of accident losing coolant, which is used in the calculation of LOCA accident actual manoeuvre boundary condition. Results With the comparison of the calculation results and actual readings of gamma radiation dose rate monitoring channel in the containment during the on-site accident, data match well. Conclusion By the verification, this calculation method can be used to make the estimation of dose rate in the containment under the analog accidental operating condition and provide the references for the radioactivity alteration in the containment under the accidental operating condition.
  • Uncertainty Evaluation for Determination of Tritium in Urine Samples with Liquid Scintillation Counter
    CHEN Fei, SHEN Bao-ming, YIN Liang-liang, SHAO Xian-zhang, JI Yan-qin
    2016, 25(3): 349-351. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.034
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    Objective Concentration of tritium in urine is an important indicator which can reveal the severity of tritium polltion to staff working in nuclear facilities. Uncertainty evaluation for analysis results of tritium in urine can provide a reference for revision of the national standards.Methods In this work, four real urine samples were taken as examples, the process of tritium determination with liquid scintillation counter, including sample preparation, measurement and calculation of radioactivity, were discussed. Additionally, uncertainty evaluation for tritium analysis in urine was performed. The origin of uncertainty, establishment of mathematical model, calculation of uncertainty were also detailed in this paper. Results The results showed that the relative uncertainty of the four urine samples were 11.5%、18.2%、17.5% and 20.9%. The tritium radioactivity of four samples were(6.2±1.5)、(3.8±1.4)、(3.9±1.4)、(3.2±1.4) Bq/L,respectively. Conclusion The uncertainty mainly originated from statistical error of beta counting.
  • Analysis of Influencing Factors on Ultraviolet Fluorescence Determination of Uranium
    LI Jun, LIU Ru-jia, LI Lian-shan, XIAO Yong-jun
    2016, 25(3): 352-355. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.035
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    Objective Purpose of the research. To study the effect of pH value and; Fe3+,Mn2+ on the properties of uranyl ion fluorescence. Methods Using ultraviolet fluorescence method of measuring trace uranium in samples of liquid. Results The standard addition method has no obvious influence to measure the concentration of uranium when the pH value at about 3~10. The optimal conditions for uranium determination is the pH value about 6.It cannot be measured when pH value is about 13.; Fe3+,Mn2+ play negative interference on uranium determination, they can absorb exciting light and quenched the fluorescence of uranyl cations.The fluorescence intensity is decreased on the condition that the concentration of; Fe3+ is 10μg/mL or Mn2+ is 0.1μg/mL.The negative interference can be reduced by pretreated method or dilution of sample solution. Conclusion Standard addition measurement method should try to control the pH value between 3~10;; Fe3+,Mn2+ complexes formed with fluorescent enhancers will absorb UV-light, negatively affecting the measurement of uranium. When the sample of uranium measured concentrations exceeding the high range measurement result, it is not an accurate result.
  • The Development of Emergency Response Spectrometer
    WANG Kai, ZHANG Wei, LI Hang
    2016, 25(3): 356-360. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.036
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    Objective To develop a set of emergency response spectrometer, with a wide measurement range, high industrial protection grade, radio transmission function, battery and characteristics of artificial radionuclides and dose rate of recognition, the detector can be deployed quickly around the nuclear facilities in the composition of monitoring network after the accident. Methods Through modular, specialization, scalability design concept, relying on reliable quality management system, the mature parts, the project successfully completed the design target. Results Detector developed and completed in the ambient dose equivalent rate of between the 10 nSv/h and 150 μSv/h using NaI (TL) were measured, and nuclide identification, between 10 μSv/h and 3 Sv/h by GM tubes were measured, by wireless transmission module with 3G and RF redundant design of the monitoring data will be sent to the data processing center for processing and display. Conclusion The detectour can meet the needs of neergency monitoring afeter the accident.
  • Comparison of the Vary of the Efficiency for γ Spectrometry Calibrated by Using the Standard Sample
    ZHANG Jing, ZHOU Qiang, TUO Fei, LI Wei-hong, ZHANG Qing, SU Xu
    2016, 25(3): 361-363. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.037
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    Objective To compare the difference of detection efficiency of the gamma ray spectrometer between different standard sample, and to provide reference for the efficiency correction in the sample measurement and analysis.Methods Water,fish meat,vegetables and rice ash four standard samples were used in the same HPGe gamma spectrometer for measurement and analysis, the relative deviation of efficiency value were obtained. Results Water samples and biological samples were different from the sample's geometry and the media, resulting in the difference of the efficiency value in each point. These three kinds of biological samples have different density, and the efficiency of each point is slightly different. Conclusion During the calibration, the efficiency of the sample should be consistent with the medium is consistent with. Secondly, the sample should be consistent with the density. The deviation of the efficiency of the density is larger in the low energy.
  • Two Methods for Calibration on Plane Parallel Ionization Chambers
    XUE Xian, LUO Su-ming, HE Zhi-jian, WU Hao, FENG Zhong-su
    2016, 25(3): 364-368. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.038
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    Objective Using two methods (The electron beam method and 60 Co in-phantom method) for calibration plane parallel ionization chambers.Methods The electron beam method:The main recommendation in TRS-381 is to perform the determination of ND,airpp,air using the electron beam method where the plane parallel ionization chamber(NACP02, Depth of the effective point of measurement 2.70 cm) to be calibrated is compared with a reference thimble chamber 0.65 cm3 (Depth of the effective point of measurement 2.88 cm). Electron beam energy is 18 MeV, The SSD should be 100 cm and the field size at the phantom surface 15 cm×15 cm,Dose rate of the accelerator 300 monitor units/min; or the same way but not use the chamber which is used to monitor. 60 Co in-phantom method:The SSD should be 80cm and the field size at the phantom surface is10 cm×10 cm,measurement time 60 s, with a reference thimble chamber 0.65 cm3. The other condition is same with the electron beam method. Then to measure and compare the results of two methods. Results Absorbed dose to air factor using the electron beam method is 52.30Gy/C·kg -1 (with out monitor chamber 52.27 Gy/C·kg -1), where there are 0.05% deviation to 60 Co in-phantom method which is 52.33 Gy/C·kg -1. Conclusion 60 Co in-phantom method which can give the same results of calibration plane parallel ionization chambers may replace the electron beam method for absorbed dose to air factor.
  • Study of Clinical Application about Coronary Angiography by Low Dosage and Low Concentration In 256 Layer Spiral CT
    WAN Yu-zhen, DONG Nan, WANG Sheng-wei, JIA Yong-geng, CHEN Li-juan, ZHOU Liang, YUN Cai-hong
    2016, 25(3): 375-377. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.042
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    Objective To explore the feasibility of CTA in the coronary arteries with the double low technology, namely lowkV (100 kV) and low concentration of iodine wcontrast agent (270 mgI/ml). Methods In the inclusion criteria, 100 patients with coronary artery CTA examination are divided into A, B two groups. Group B again divided into B1 and B2 group according to the tube voltage and different iodine contrast agent. A group of 30 cases applied the prospective heart switch control, using 100 kV, 270 mgI/ml Visipaque contrast medium, group B applied retrospective heart switch control, including B1 group of 35 cases with 100 kV, 270 mgI/ml Visipaque contrast medium, B2 group of 35 cases with 120 kV, 370 mgI/ml Iopromide contrast agent. Finally, Calonlate the effective radiation dose of groups. Results The mean effective dose (ED) in group A is (1.32±0.012) mSv, B1 is (5.55±1.04) mSv, B2 group is (10.57±1.07) mSv. Between group A and group B1, group A and group B2 and B1 and B2 group, there is statistically significant. Conclusion Under the condition of body mass index of ≤ 25.0 kg/m2 or less, the application of double low technology, low kV (100 kV), low concentration of iodine contrast agent, can effectively reduce the radiation dose.
  • The Application Value of Spiral CT Reconstruction Technique in Maxillofacial Fractures
    TIAN Geng, ZHENG Jing-zhen
    2016, 25(3): 378-379. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.043
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    Objective To explore the application value of the spiral CT three-dimensional reconstruction and dental software technology in maxillofacial fractures. Methods Randomly selected 78 consecutive hospitalized patients with maxillofacial fractures treated between June 2014 and June 2015 as the research object. All the patients were confirmed as maxillofacial fractures by operations and they were examined by conventional X-ray plain film, spiral CT scan and 3D reconstruction. Comparing different kinds of examination programs, we analyzed the values on clinical application. Results The total detection rate of maxillofacial fractures with X-ray plain film was significantly lower than that of plain CT scan and CT three-dimensional reconstruction and dental software,P<0.05, the difference was statistically significant; there was no significant difference between plain CT scan and CT three-dimensional reconstruction and dental software when compare to the complex maxillofacial fractures diagnosed rate, P>0.05, but the total detection rate of CT three-dimensional reconstruction and dental software technology for simple fracture or merger of tooth fracture was obviously higher than that of CT plain scan,P<0.05.Conclusion Spircl CT three-dimensional reconstruction and dental software technology not only have a relatively high diagnosis rate of maxillofacial fractures but also have a high detection rate of all kinds of fractures, especially for complex fractures, which has values on clinical application and promotion.
  • The Value of Prenatal Diagnosis of Corrected Transposition of the Great Arteries by Echocardiography
    LU Ai-qing, LV Bin, LI Quan-tai, ZHU Jian-guo, LI Fu-sheng, SUN Zuo-zhong
    2016, 25(3): 380-382. https://doi.org/10.13491/j.cnki.issn.1004-714x.2016.03.044
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    Objective To investigate the value of prenatal ultrasound in the diagnosis of corrected transposition of the great arteries (CTGA) by using the method of three segments of heart. Methods Cases of fetal were screened by the method of Three segment heart anatomy concept analysis and 6 cases were detected or suspected CTGA, whose ultrasonic data were analyzed retrospectively. Results Of the 6 cases which were detected or suspected CTGA, after birth echocardiography or autopsy, confirming one case of simple CTGA, 3 cases of CTGA ventricular septal defect, 1 case of CTGA ventricular septal defect, pulmonary stenosis, 1 CTGA case with ventricular septal defect, aortic coarctation, including one case of misdiagnosis muscular ventricular septal defect, 1 case of missed diagnosis of aortic arch. Conclusion The key to the diagnosis of CTGA is the inconsistency of the atrioventricular connection and the ventricular arterial connection. A careful observation of the four chamber view and left and right ventricular outflow tract is an important step in the diagnosis of CTGA. Three segment heart anatomy concept analysis is a reliable method of prenatal Ultrasonographic diagnosis of fetal CTGA, which has a good clinical application value.