中华放射医学与防护杂志最新文献

{"title":"Eeffects of tube voltage on image quality and radiation dose of paranasal sinus CT examination","authors":"Jianxing Wu, Y. Niu, Yongxian Zhang, Lili Zhang","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.03.013","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.03.013","url":null,"abstract":"Objective \u0000To explore the effects of tube voltage on the image quality and radiation dose of paranasal sinus CT on a 16 cm wide-detector CT. \u0000 \u0000 \u0000Methods \u0000The sinus area of head specimen was scanned with sequential scanning mode and tube voltages of 70, 80, 100, 120 and 140 kV, respectively. The parameters were set as follows: NI=9, automatic tube current modulation, Smart mA with the maximum range at the corresponding tube voltage, 120 mm detector width. The images were reconstructed with bone and soft tissue algorithms separately.The slice thickness was 0.625 mm for all reconstructed images. The axial, coronal and sagittal images were reformatted as 2 mm thickness with clinical baseline. The CT value and standard deviation (SD) were measured in the region of interest(ROI) of central axial image and the contrast-to-noise ratio (CNR) was calculated. The volume CT dose index(CTDIvol) and dose length product (DLP) were recorded, and the figure of merit (FOM) of images was computed. The images obtained in the study were subjectively evaluated by two experienced radiologists and one technician using a five-point scoring system. \u0000 \u0000 \u0000Results \u0000The subjective evaluation of images obtained in the study met the diagnostic requirements. With the reconstruction of bone algorithm, the CNR at the tube voltages of 100 and 80 kV were 66.98 and 64.75, respectively, which was significantly higher than those at the tube voltages of 70, 120 and 140 kV (51.61, 61.56 and 57.76, respectively). The maximum and minimum CTDIvol were 34.11 mGy at 140 kV and 17.45 mGy at 70 kV. The FOM value was 152.26 at 100 kV. With the reconstruction of soft tissue algorithm, the maximum CNR was 195.62 at 80 kV, which was markedly greater than those at 70, 100, 120 kV and 140 kV (139.46, 154.49, 148.06 and 155.58 respectively). The maximum FOM value was 1273.56 at 80 kV, which was significantly higher than those at the tube voltages of 70, 100, 120 kV and 140 kV (1114.56, 809.98, 735.63 and 709.62, respectively). \u0000 \u0000 \u0000Conclusions \u0000For the sinus CT of head specimen, the scan protocols with 100 kV combined with bone reconstruction algorithm and 80 kV combined with soft tissue reconstruction algorithm can provide relatively lower radiation dose and good image quality. \u0000 \u0000 \u0000Key words: \u0000CT; Paranasal sinus; Tube voltage; Radiation dose","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"403 ","pages":"233-236"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72423477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The concept of stereotactic ablation brachytherapy and practice","authors":"Junjie Wang","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.03.003","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.03.003","url":null,"abstract":"The development of tumor brachytherapy and ablation therapy leads to the concept of stereotactic ablation brachytherapy(SABT). It is categorized into H-SABT (high dose rate brachytherapy) and L-SABT (low dose rate brachy therapy). L-SABT is clinically used as radioactive seed implantation therapy. SABT is characterized with the following: hypofraction and short course of treatment, Image-guidance and precision ablation, exact curative effect and preserved organic functions. SABT has gradually become a new disciplinary system and will play an important role in cancer treatments. \u0000 \u0000 \u0000Key words: \u0000Stereotactic; Brachytherapy; Ablation; Interstitial permanent implantation","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"18 1","pages":"173-177"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90232927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation and analysis of CT doses to examined individuals in Henan province","authors":"Yanfang Zhao, Caifang Chu, Qinfu Zhang, Xiaojun Cheng, Yongxing Li, Xiaofang Luo, Bingchen Dong","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.03.012","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.03.012","url":null,"abstract":"Objective \u0000To study the level of doses which children and adults received from CT examinations in Henan province, and to explore the influencing factors, so as to provide basic data for the development of diagnostic reference (guidance) level for CT examination in China and related regions. \u0000 \u0000 \u0000Methods \u0000A total of 1 113 subjects, which have received examinations by 31 CT scanners separately in 7 cities of the province, were selected using stratified quota sampling method to carry out the dose survey, including basic information on subjects, equipment, scanning parameters, and dosimetry, etc. Typical effective dose was estimated by using dose conversion coefficient. \u0000 \u0000 \u0000Results \u0000In the conventional CT scanning of head. The 75% of CTDIw for children aged 0-1, >1-5, >5-10 and >10-15 years were 32.2, 37.2, 43.0 and 46.7 mGy; 75% of DLP were 478.0, 572.0, 715.6 and 743.9 mGy·cm and effective doses were 5.26, 3.83, 2.86 and 2.38 mSv, respectively. In the routine chest scanning, 75% of CTDIw for children aged 0-1, >1-5, >5-10 and >10-15 years were all 9.3 mGy. The 75% of DLP were 141.7, 178.8, 224.0 and 238.7 mGy·cm; and effective doses were 5.53, 4.64 4.03 and 3.10 mSv, respectively. 75% of CTDIw for head, chest and abdomen of the adult subjects from CT examinations were 57.4, 16.2 and 19.4 mGy, respectively. The 75% of DLP were 818.3, 504.7 and 571.1 mGy·cm, respectively, and effective doses were 1.72, 7.07 and 8.57 mSv, respectively. \u0000 \u0000 \u0000Conclusions \u0000As the update of CT equipment, increasing progress in examination technology and rapid increase in CT application frequency, medical institutions should choose the scanning parameters with respect to various types of CT scanner to optimize the image quality and the radiation doses. The diagnostic reference level for CT examination should be improved, especially for children. \u0000 \u0000 \u0000Key words: \u0000CT; CT dose index; Dose length product; Effective dose; Diagnostic reference level","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"12 1","pages":"227-232"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86028266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of a new method for patient positioning based on optical surface monitoring technology to head radiotherapy","authors":"Yixiao Du, H. Yue, Meijiao Wang, Shun Zhou, Songmao Yu","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.03.009","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.03.009","url":null,"abstract":"Objective \u0000To develop a new method to set up patients using optical surface monitoring system and to compare it with the conventional method in head radiotherapy. \u0000 \u0000 \u0000Methods \u0000A total of 358 set-ups (130 with the conventional method and 228 with the new method ), which were from 99 head tumor patients in Beijing Cancer Hospital treated between May 2018 to April 2019, obtained by using Image Guided Radiotherapy were retrospectively analyzed. The distributions of set-up errors, the number of abnormal positions, and the set-up time were compared to evaluate the potential advantages of the new method . \u0000 \u0000 \u0000Results \u0000The mean (± standard deviation) absolute values of setup errors of the new method were (0.07±0.07) , (0.08±0.06) and (0.06±0.06) cm for the vertical, lateral, and longitudinal, (0.53±0.41)°, (0.59±0.44)° and (0.59±0.46)° for the rotation, pitch and roll, respectively. In the new method , the setup accuracy was improved(t=3.24-6.10, P 0.05). \u0000 \u0000 \u0000Conclusions \u0000The new high-precision method to set up patients using optical surface monitoring system improves the accuracy of patients′ position, decreases the corrections applied by 6DoF couch, reduces the probability of abnormal positions, and suggests the potential benefit in head radiotherapy. \u0000 \u0000 \u0000Key words: \u0000Set-up errors; Image guided radiotherapy; Six degrees of freedom (6DoF) couch; Optical surface monitoring technology","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"70 1","pages":"209-215"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83491901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Therapy effect of cimetidine on spleen of mice irradiated with thoracic fractionated irradiation","authors":"Yang Bai, Junling Zhang, Dan Yao, Jianghong Zhang","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.03.004","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.03.004","url":null,"abstract":"Objective \u0000To investigate the protective effect of cimetidine on mice with fractionated X-ray irradiation through right thorax. \u0000 \u0000 \u0000Methods \u0000Thirty male C57BL/6 mice were randomly divided into control group, irradiation group and irradiation + cimetidine group (100 mg/kg), 10 mice in each group. Mice right thorax was locally irradiated with X-rays at a dose rate of 0.883 Gy/min to a cumulative dose of 24 Gy, 8 Gy per day in 3 d. After irradiation, the irradiation + cimetidine group was given cimetidine (100 mg·kg-1·d-1) for 7 d consecutively, and Ctrl and IR groups were given saline. Seven days after irradiation, the mice weight, spleen index and its T lymphocytes, B lymphocytes and NK cells were measured. Spleen tissue was stained with HE for pathological observation. \u0000 \u0000 \u0000Results \u0000The fractionated irradiation lightly suppressed mice growth but obviously induced abscopal damage on spleen so that the spleen index were decreased. The irradiation group (0.369±0.011) had statistically significant difference compared with the control group(0.396±0.022)(t=2.978, P<0.05), the spleen pathological structure became disorder, and the percentages of CD3+ , CD4+ , CD3+ CD4+ , CD3+ CD8+ lymphocytes in spleen were decreased significantly(t=5.754, 3.570, 4.442, 5.281, 4.570, P<0.05). Cimetidine could partially restore the weight of irradiated mice, relieved spleen structure damage and effectively restored lymphocyte subsets, and partly recovered the levels of CD3+ , CD3+ CD4+ , CD3+ CD8+ lymphocytes in the spleen (t=3.523, 2.706, 2.520, P<0.05). \u0000 \u0000 \u0000Conclusions \u0000Cimetidine, as a potential radiation protection drug, could effectively reduce the mouse spleen injury induced by X-ray fractionated irradiation by improving mouse immune function. \u0000 \u0000 \u0000Key words: \u0000Radiotherapy; Abscopal effect; Cimetidine; Spleen lymphocytes","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"15 1","pages":"178-182"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75105868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"南京 192 Ir放射事故患者照后第4年细胞遗传学随访","authors":"陆雪, Xue Lu, 赵骅, Zhao Hua, 王进, Wang Jin, 李爽, Liang Shuang, 田雪蕾, Tian Xuelei, 王福如, Wang Furu, 田梅, Tian Mei, 余宁乐, Yu Ningle, 刘青杰, Liu Qingjie","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.03.005","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.03.005","url":null,"abstract":"Objective \u0000To screen the indicators of retrospective dose estimation, based on 5 cytogenetic methods to assess the victim followed-up at 4 year after 192Ir radiation accident in Nanjing. \u0000 \u0000 \u0000Methods \u0000The chromosome aberration (dic + r) assay, cytokinesis block micronucleus (MN) and nucleoplasmic bridge (NPB) assay, fluorescence in situ hybridization (FISH)-based and G banding-based translocation analysis were used to retrospective biological dose estimation. \u0000 \u0000 \u0000Results \u0000The estimated doses of FISH-based and G banding -based analysis were 1.45 and 1.21 Gy respectively, which was similar to the biological dose estimated short time after the accident. However, the estimated doses by chromosome aberration, micronucleus and nucleoplasmic bridge method were 0.56, 0.45 and 0.41 Gy respectively, which were lower than the corresponding biodose. Correction factors were used to adjust the biodose. \u0000 \u0000 \u0000Conclusions \u0000In the 4th years after exposure, the estimated biological doses by FISH-based and G banding-based translocation were consistent with the biodose.Therefore, the two methods were suitable for retrospective dose estimation, while correction factors should be considered in chromosome aberration method for retrospective dose estimation. \u0000 \u0000 \u0000Key words: \u0000Chromosome aberration; Fluorescence in situ hybrdization; G banding; Biological dose estimation; Correction coefficient","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"140 1","pages":"183-188"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86146439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Progress on the fundamental biological studies for tumor therapy with heavy particles","authors":"Yingchu Dai, Jiade J. Lu, Guangming Zhou","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.03.016","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.03.016","url":null,"abstract":"Due to its unique physical and biological advantages, heavy ion beam has great advantages as tumor radiotherapy ray. Tumor therapy with heavy particles has achieved outstanding clinical outcome and is of the potential to become the most advanced radiotherapy in this century. Fundamental studies on the biological effects are of significance in providing theoretical principle and optimizing beam quality for tumor therapy with heavy particles. Meanwhile, the application of new techniques such as FLASH and GRID in tumor therapy with heavy particles requires fundamental biological studies as well, especially in improving clinical efficacy and security. In this article, we review the progress on the fundamental biological studies for tumor therapy with heavy particles and arouse discussion on the issues necessary for further elucidation. \u0000 \u0000 \u0000Key words: \u0000Heavy ion; Tumor radiotherapy; Relative biological effectiveness; Oxygen enhancement ratio","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"132 1","pages":"247-252"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79659009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The application value of low-dose CT scan in pregnant women with corona virus disease 2019","authors":"Liang Li, Li Wang, Feifei Zeng, Fang Liu, Zhoufeng Peng, Baojun Xie, Changsheng Liu, Y. Zha","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.0009","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.0009","url":null,"abstract":"Objective \u0000To explore the value of low-dose CT in pregnancy with corona virus disease 2019(COVID-19). \u0000 \u0000 \u0000Methods \u0000A retrospective analysis was performed on the clinical characteristics, laboratory tests, and chest CT findings of 12 patients with pregnancy and COVID-19 diagnosed by nucleic acid testing from Renmin Hospital of Wuhan University from January 20, 2020 to February 16, 2020. Two radiologists blinded to the reconstruction algorithm independently scored subjective image quality on a 5-point Likert scale (grade 1, major noise, heavy artifacts, almost not visible, no diagnosis possible; grade 2, above average noise, poor, substantial, diagnostic confidence substantially reduced; grade 3, average image noise, moderate, but sufficient for diagnosis; grade 4, less than average noise, good, below average; grade 5, minimal noise, excellent). A clinical diagnosis of ≥3 was acceptable. The doctors recorded the CT radiation dose, including CT volume dose index (CTDIvol), dose length product (DLP), and effective radiation dose (E). Then two radiologists observed the distribution, shape, density, and other characteristics of lung lesions, and decided whether hilar, mediastinal lymphadenopathy, and pleural changes. \u0000 \u0000 \u0000Results \u0000Of the 12 pregnancy with COVID-19, 8 had cough, 4 had fever, 2 had chest tightness, and 1 had dyspnea and diarrhea each. The CT image quality score of all patients was (3-4), with an average of 3.46, which fully met the clinical diagnosis requirements. The CTDIvol value was (1.13 - 4.31) mGy, with an average of 3.02 mGy. The DLP value was (34.48 -75.29) mGy • cm, with an average of 55.48 mGy • cm. The E value was (0.48 - 1.05) mSv, with an average of 0.78 mSv. In all cases, chest CT examination showed abnormal manifestations after clinical symptoms, including unilateral lung lesions in 5 cases and bilateral lung lesions in 7 cases. 1 case of ground-glass opacity, 1 case of solidification, 7 cases of ground-glass and consolidation, 1 case of strip opacity, ground-glass, consolidation and strip cable shadow coexisted in 2 cases. \u0000 \u0000 \u0000Conclusions \u0000The application of low-dose CT scan in pregnancy with COVID-19 is completely feasible. CT mainly manifested as bilateral lung patchy, flaky ground-glass opacity with consolidation. Active and effective treatment can completely recover, prognosis better. \u0000 \u0000 \u0000Key words: \u0000Radiation dose; Pregnancy; Novel coronavirus infection; Pneumonia; Tomography, X-ray computed","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91010881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring of CT dose and analysis of radiological protection in CT module applied for COVID-19 prevention and control","authors":"Ansheng Liu, Bolin Huang, Cuiling Li, Kai Yang, H. Du, Guilin Yi","doi":"10.3760/CMA.J.ISSN.0254-5098.0008","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.0008","url":null,"abstract":"Objective \u0000To investigate the safety and protection level of radiological treatment in the CT module in Wuhan during the prevention and treatment of COVID-19. \u0000 \u0000 \u0000Methods \u0000The layout position of the CT module in makeshift hospitals, radiological protection facilities and personal protective equipment were investigated. Based on the national standards, CT dose index and evaluated radiological protection level of the CT module were measured. \u0000 \u0000 \u0000Results \u0000The layout position of the CT module in makeshift hospitals are reasonable, and radiological protection facilities are well-equipped. 87.0% of them had been accepted. In 23 CT module, 20 of which were up to standards. The other three had 1 detection points which exceed the national standards, and then had been modified immediately, so as to reach the national standards. In addition, CT dose index was measured in 7 CT module of them, the variation of body CTDIW was less than 7.5%. \u0000 \u0000 \u0000Conclusions \u0000The CT module in Wuhan meet the requirements of the radiological safety and protection level during the prevention and treatment of COVID-19. \u0000 \u0000 \u0000Key words: \u0000COVID-19; CT module; Radiological protection; CT dose index (CTDI)","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73830810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation and analysis on the infection control and radiation safety of radiodiagnostic workplace for COVID-19","authors":"L. Tang, Wenshan Zhou, Sheng Liu, Xiangjun Yang, Xixiang Huo, Shuguang Xie, Jing Li, Ansheng Liu, Shi-xiong Tang, Z. Lei, Weimin Chen, Y. Niu","doi":"10.3760/CMA.J.ISSN.0254-5098.2020.04.001","DOIUrl":"https://doi.org/10.3760/CMA.J.ISSN.0254-5098.2020.04.001","url":null,"abstract":"Objectives \u0000To survey and supervise the risk of infection control and radiation safety in the radiological diagnostic workplace for novel coronavirus pneumonia(COVID-19), and provide data support for the safety protection of radiographers and related staff. \u0000 \u0000 \u0000Methods \u00004 emergency hospitals for COVID-19 including 2 makeshift hospitals, module hospital and brick pattern hospital were performed the testing and evaluation of imaging performance and radiological protection for the 8 new installed CT scanners and places according to the national standards of WS 519-2019 and GBZ 130-2013. The infection control safety factors such as the layout of the equipment room were monitored and investigated. Two COVID-19 designated hospitals including general hospital and infectious disease specialized hospital were selected to carry out field investigation and sampling of environmental biological samples for 4 CT rooms. Then the samples were detected for the nucleic acid of novel coronavirus. The results of radiodiagnostic workplace overall arrangement, infection prevention and the nucleic acid testing were analyzed, and the biological safety reliability and risk point were evaluated. \u0000 \u0000 \u0000Results \u0000The indicators of imaging performance and radiation protection for 8 CT scanners in emergency hospitals could meet the requirements of national standards. Each of 2 makeshift hospitals had 3 CT rooms with the area of 38.8 m2 and shielding protection of 4 mm Pb. The CT rooms in module hospital and brick pattern hospital had the area and shielding protection of 20.0 m2, 4 mm Pb equivalent and 35.8 m2, 3 mm Pb equivalent, respectively. The 8 radiological diagnostic workplaces of the emergency hospitals were designed and constructed based on \"three zones with two passageways\" . The testing results of the nucleic acid indicated that the multiple sites such as scanning bed, internal of gantry and ground touched by patients in CT scanning room were found positive samples. The areas such as console panel and ground were got polluted risk by the virus infected hands and feet of radiographers. In addition, the areas in scanning room with no touch of patients, such as observation window and air outlet, were found similar positive samples. \u0000 \u0000 \u0000Conclusions: \u00008 CT scanners and rooms in 4 emergency hospitals basically meet the requirements of imaging performance and radiation protection. The disinfection of COVID-19 radiodiagnostic workplace should be standardized. \u0000 \u0000 \u0000Key words: \u0000COVID-19; Radiodiagnostic workplace; Radiation safety; Infection control; Module CT","PeriodicalId":36403,"journal":{"name":"中华放射医学与防护杂志","volume":"26 1","pages":"253-258"},"PeriodicalIF":0.0,"publicationDate":"2020-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83224266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}