Brazilian Journal of Radiation Sciences最新文献_第2页

Evaluation of Various Free Software Options for Catphan 504 Phantom Analysis 评估用于 504 个猫眼幻影分析的各种免费软件选项

Brazilian Journal of Radiation Sciences Pub Date : 2024-03-20 DOI: 10.15392/2319-0612.2024.2335

Lorena Cunha Fernandes, Maira Ribeiro dos Santos, Leonardo Peres da Silva, Thiago Viana Miranda Lima, R. Simões

{"title":"Evaluation of Various Free Software Options for Catphan 504 Phantom Analysis","authors":"Lorena Cunha Fernandes, Maira Ribeiro dos Santos, Leonardo Peres da Silva, Thiago Viana Miranda Lima, R. Simões","doi":"10.15392/2319-0612.2024.2335","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2335","url":null,"abstract":"In computed tomography, image quality tests are important to guarantee a correct medical diagnosis and a better cost and benefit for the patient. Purpose: the purpose of this study is to analyse the images reconstructed with different thorax and bone convolution filters using popular free-use software in the field of medical physics, for the Catphan 504 phantom. Methods: a total of 14 scans were performed using the chest protocol, with convolution filters (FC) FC30, FC35, FC50, FC51, FC52, FC53, FC55, FC56, FC80, FC81, FC83, FC84, FC85, FC86, on the 16-channel Canon Aquilion Lightning CT scanner using the Catphan 504 phantom. Image quality parameters evaluated were: noise, uniformity, linearity of CT numbers, and high spatial resolution with MTF 50% and MTF 10%. The images were evaluated using software such as ImageJ, Script Python, and free software for automatic evaluation of the Catphan 504 phantom, CTQA-cp, SPICE-CT, and Pylinac. Results: the tests carried out with the Catphan 504 phantom were analysed by the software and agreed with each other (with p>0.05), except for Pylinac. The results obtained with Pylinac had a significant difference for the uniformity, slice thickness, and MTF10% tests, this being the code that was the furthest away from the results obtained by the other codes. Conclusions: the ImageJ, Spice-CT, and CTQA-cp software showed consistent results for the tests performed, while Pylinac had limitations in calculating the standard deviation for the noise test and showed significant differences in some tests when compared to the other software.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"94 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140225054","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}

引用次数: 0

Overview of Fourth Generation Reactors Studied at the Universidade Federal de Minas Gerais (Brazil) 巴西米纳斯吉拉斯联邦大学研究的第四代反应堆概览

Brazilian Journal of Radiation Sciences Pub Date : 2024-03-13 DOI: 10.15392/2319-0612.2024.2419

C. A. M. Silva, Anderson Altair Pinheiro de Macedo, Maurício Gilberti, Fabiano Cardoso da Silva, I. R. Magalhães, A. Costa, Claubia Pereira

引用次数: 0

Instrumental Neutron Activation Analysis (INAA) As-sessment of REE of Soil from Mining Site Umuahia, Abia State, South East, Nigeria 尼日利亚东南部阿比亚州乌穆阿希亚采矿场土壤中的稀土元素的仪器中子活化分析 (INAA) As-sessment of REE of Soil from Mining Site Umuahia, Abia State, South East, Nigeria

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-28 DOI: 10.15392/2319-0612.2024.2336

M. E. Onudibia, P. S. C. Silva, A. Essiett, G. S. Zahn, F. Genezini, H. M. S. M. D. Linhares, N. C. Nnamani, M. C. Bede, F. O. Okoh, E. E. Imeh, C. M. Odoh

引用次数: 0

Decontamination of equipment with oil and gas NORM: the need for internal individual monitoring 油气 NORM 设备的去污：内部单独监测的必要性

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-21 DOI: 10.15392/2319-0612.2024.2262

A. C. C. S. Ribeiro, W. O. Sousa, F. C. A. Silva

{"title":"Decontamination of equipment with oil and gas NORM: the need for internal individual monitoring","authors":"A. C. C. S. Ribeiro, W. O. Sousa, F. C. A. Silva","doi":"10.15392/2319-0612.2024.2262","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2262","url":null,"abstract":"In the oil field, Naturally Occurring Radioactive Material - NORM is present in petroleum-forming rocks and this is related to the presence of radioactive decay series of 238U and 232Th, mainly the daughter radionuclides 226Ra and 228Ra. These radionuclides are detected during the process of production and extraction of oil and gas. They migrate from the reservoir rock and flow through the production lines until the operating areas, forming sludge and scale. The presence of 226Ra and 228Ra can be found in many pieces of equipment on the platforms, and NORM concentrations may increase due to different extraction processes. When this accumulation of NORM occurs inside the equipment, it is necessary to decontaminate them. Depending on the decontamination technique, workers can be exposed to radioactive materials contained in sludge and scale, which are released in the form of aerosols. The existing radiological risk during decontamination is based on external irradiation and internal contamination of workers, this is why an individual monitoring program covering both external and internal dosimetry is necessary. External monitoring is widely used during the routine work of decontamination of equipment, but for internal monitoring, the real importance has not been given, despite the probability of being the greatest contribution to radiological risk for workers. This article presents the need for internal individual monitoring for a comprehensive assessment of radiological risk and a general description of how it is being done in several countries to assist in the implementation of a complete individual monitoring program, mainly in Brazil.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"70 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140444490","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}

引用次数: 0

Evaluation of a Digital Mammography System with the MAM-162 phantom 使用 MAM-162 模体评估数字乳腺 X 射线摄影系统

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-21 DOI: 10.15392/2319-0612.2024.2283

A. Castillo, N. A. Roas Zúniga

{"title":"Evaluation of a Digital Mammography System with the MAM-162 phantom","authors":"A. Castillo, N. A. Roas Zúniga","doi":"10.15392/2319-0612.2024.2283","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2283","url":null,"abstract":"Quality controls are performed to verify the performance status of X-ray equipment in relation to image quality and patient dose. Originally, the Laboratory of Radiation Physics and Metrology (LAF-RAM) in Nicaragua had only one phantom to evaluate mammography image quality subjectively; however, under a cooperation project with the International Atomic Energy Agency (IAEA), the MAM-162 phantom was acquired for the evaluation of physical image quality. In this work a CR type digital mammography system was evaluated using the MAM-162 phantom with adaptation to a single quality control protocol based on international standards such as the German Institute for Standardization (DIN) DIN 6868-162:2013-06, the IAEA technical document TECDOC protocol No. 1958 and the European Federation of Organizations for Medical Physics (EFOMP) mammo protocol. Among the main tests performed are the evaluation of the lateral image limit of the chest wall with satisfactory results, the automatic exposure control, the Signal-to-Noise difference ratio that complies with the tolerances, in the case Ghosting and dynamic range the results of both are satisfactory, the presence of artifacts was observed when applying variance mapping, a base value of the dynamic range was also obtained. For the dosimetry, the half value layer and the determination of the Mean Glandular Dose were evaluated, which does not comply with the tolerances. The final protocol document could be validated and implemented as part of the management and service documents of the Quality Control and Monitoring Laboratory (LCM) of LAF-RAM.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"208 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140445180","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}

引用次数: 0

Analysis of external personal dosimetry for external ex-posure to medical radiation workers in radiotherapy and nuclear medicine departments between 2019 and 2022 2019 年至 2022 年期间放射治疗和核医学部门医用辐射工作人员体外照射个人剂量测量分析

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-21 DOI: 10.15392/2319-0612.2024.2256

M. C. Mancilla, A. Ferreira-Tapia, L. M. Ayala

{"title":"Analysis of external personal dosimetry for external ex-posure to medical radiation workers in radiotherapy and nuclear medicine departments between 2019 and 2022","authors":"M. C. Mancilla, A. Ferreira-Tapia, L. M. Ayala","doi":"10.15392/2319-0612.2024.2256","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2256","url":null,"abstract":"The National Cancer Institute from Chile possesses a wide variety of high-complexity equipment for cancer treatment and diagnosis that employs ionizing radiation with high and medium energy. Presently, the radiotherapy department is equipped with 5 clinical linear accelerators and one brachytherapy equipment, while the nuclear medicine department is equipped with a PET-CT, a single gamma camera, and a hospitalization room for betatherapy. A descriptive statistical analysis was conducted on the Personal Doses Equivalent Reports from medical radiation workers between 2019-2022. The analysis involved extracting Hp(10) and Hp(0.07) measurements from digital reports using the Python Pandas library, and a database was constructed. The annual set of data was selected for each department to describe their behavior concerning Hp(10) total since PD8 dosimeters had the highest circulation. Additionally, using the boxplot format for the Hp(10) and Hp(0.07) distributions, means, medians, minimums and maximums, interquartile ranges and outliers were analyzed. While Hp(10) measurements exhibited an increase, Hp(0.07) measurements remained constant or experienced a decrease. All reported measurements were less than international tolerances. Finally, this initial descriptive statistical analysis enables the radiation safety officers to evaluate the applicability of inferential statistical analysis with stronger evidence and in an objective manner.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"11 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140444199","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}

引用次数: 0

Development of a pulsed laser deposition system suitable for radioactive thin films growth 开发适用于放射性薄膜生长的脉冲激光沉积系统

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-07 DOI: 10.15392/2319-0612.2024.2331

N. G. P. Machado, F. Genezini, M. P. Raele

{"title":"Development of a pulsed laser deposition system suitable for radioactive thin films growth","authors":"N. G. P. Machado, F. Genezini, M. P. Raele","doi":"10.15392/2319-0612.2024.2331","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2331","url":null,"abstract":"Radioactive thin films have a direct application in the development of beta-voltaic batteries. The main advantage of that kind of nuclear battery is its durability, which can range from a hundred years, depending on the half-life of the radioisotope used. In this context, Pulsed Laser Deposition (PLD) is an important tool. A relevant aspect of a system using this technique is that the main equipment is outside the chamber where the material is processed. Consequently, this feature allows the growth of radioactive thin films, as it enables the development of an arrangement where the contaminated area is controlled. In this way, the present work proposed the development of a PLD system for the growth of radioactive thin films. The PLD system was then implemented and radioactive copper targets were processed for 60 min and 120 min, resulting in radioactive thin films with an average thickness of (167.8 ± 3.7) nm and (313.5 ± 9.2) nm, respectively. Then, a study was performed about the radioactive contamination spread in the PLD system in order to prove if the filtering implemented was effective in retaining the contamination inside the vacuum chamber. Thus, it is demonstrated for the first time the feasibility of using the PLD technique in the growth of radioactive thin films, making its use possible in future studies on the development of beta-voltaic nuclear batteries.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"162 8‐12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139796545","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}

引用次数: 0

Development of a pulsed laser deposition system suitable for radioactive thin films growth 开发适用于放射性薄膜生长的脉冲激光沉积系统

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-07 DOI: 10.15392/2319-0612.2024.2331

N. G. P. Machado, F. Genezini, M. P. Raele

{"title":"Development of a pulsed laser deposition system suitable for radioactive thin films growth","authors":"N. G. P. Machado, F. Genezini, M. P. Raele","doi":"10.15392/2319-0612.2024.2331","DOIUrl":"https://doi.org/10.15392/2319-0612.2024.2331","url":null,"abstract":"Radioactive thin films have a direct application in the development of beta-voltaic batteries. The main advantage of that kind of nuclear battery is its durability, which can range from a hundred years, depending on the half-life of the radioisotope used. In this context, Pulsed Laser Deposition (PLD) is an important tool. A relevant aspect of a system using this technique is that the main equipment is outside the chamber where the material is processed. Consequently, this feature allows the growth of radioactive thin films, as it enables the development of an arrangement where the contaminated area is controlled. In this way, the present work proposed the development of a PLD system for the growth of radioactive thin films. The PLD system was then implemented and radioactive copper targets were processed for 60 min and 120 min, resulting in radioactive thin films with an average thickness of (167.8 ± 3.7) nm and (313.5 ± 9.2) nm, respectively. Then, a study was performed about the radioactive contamination spread in the PLD system in order to prove if the filtering implemented was effective in retaining the contamination inside the vacuum chamber. Thus, it is demonstrated for the first time the feasibility of using the PLD technique in the growth of radioactive thin films, making its use possible in future studies on the development of beta-voltaic nuclear batteries.","PeriodicalId":505520,"journal":{"name":"Brazilian Journal of Radiation Sciences","volume":"14 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139856458","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}

引用次数: 0

The radioactive contamination of ground and surface water near a uranium mine in Malawi 马拉维铀矿附近地下水和地表水的放射性污染

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-02 DOI: 10.15392/2319-0612.2024.2341

L. J. Majawa, O. A. Jegede, V. Tshivhase, B. T. Chobeka, T. D. Mokgele

引用次数: 0

The radioactive contamination of ground and surface water near a uranium mine in Malawi 马拉维铀矿附近地下水和地表水的放射性污染

Brazilian Journal of Radiation Sciences Pub Date : 2024-02-02 DOI: 10.15392/2319-0612.2024.2341

L. J. Majawa, O. A. Jegede, V. Tshivhase, B. T. Chobeka, T. D. Mokgele

引用次数: 0