scholarly journals Estimation of Nuclear Medicine Exposure Measures Based on Intelligent Computer Processing

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Junfeng Wang ◽  
Fangxiao Wang ◽  
Yue Liu ◽  
Yuanfan Xu ◽  
Jiangtao Liang ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Sampling Rate ◽  
Compartment Model ◽  
Exposure Dose ◽  
Internal Exposure ◽  
Calculation Algorithm ◽  
Pulse Area ◽  
Fitting Algorithm ◽  
Extraction Algorithm ◽  
Pulse Peak

This paper provides an in-depth discussion and analysis of the estimation of nuclear medicine exposure measurements using computerized intelligent processing. The focus is on the study of energy extraction algorithms to obtain a high energy resolution with the lowest possible ADC sampling rate and thus reduce the amount of data. This paper focuses on the direct pulse peak extraction algorithm, polynomial curve fitting algorithm, double exponential function curve fitting algorithm, and pulse area calculation algorithm. The detector output waveforms are obtained with an oscilloscope, and the analysis module is designed in MATLAB. Based on these algorithms, the data obtained from six different lower sampling rates are analyzed and compared with the results of the high sampling rate direct pulse peak extraction algorithm and the pulse area calculation algorithm, respectively. The correctness of the compartment model was checked, and the results were found to be realistic and reliable, which can be used for the analysis of internal exposure data in radiation occupational health management, estimation of internal exposure dose for nuclear emergency groups, and estimation of accidental internal exposure dose. The results of the compartment model of the respiratory tract and the compartment model of the digestive tract can be used to calculate the distribution and retention patterns of radionuclides and their compounds in the body, which can be used to assess the damage of radionuclide internal contamination and guide the implementation of medical treatment.

Proposed Dose Constraints in the Duties of Radiation Workers at the Department of Nuclear Medicine

2019 ◽  
Vol 187 (4) ◽  
pp. 535-539
Author(s):  
Woon-Kwan Chung ◽  
Nam-Hee Yang ◽  
Kyung-Rae Dong ◽  
Jiwon Choi
Keyword(s):  
Nuclear Medicine ◽  
Exposure Dose ◽  
Individual Exposure ◽  
Limit Value ◽  
Positron Emission ◽  
Pet Ct ◽  
Dose Constraint ◽  
Dose Limits ◽  
The Individual ◽  
Dose Constraints

Abstract This study aimed to set a dose constraint for certain duties of radiological technologists in the department of nuclear medicine. From 2013 to 2017, the 5 y radiation exposure data of employees performing PET-CT and γ-CAMERA of eight hospitals in Korea were measured individual exposure doses to estimate the frequency and set a representative dose of 75 and 95% from the low dose in the whole category is presented. The dose constraint was 5.5 mSv for PET-CT, 4.5 mSv for γ-CAMERA and 3.5 mSv for Positron Emission Tomography (PET)-Computed Tomography(CT) and Gamma CAMERA (γ-CAMERA). Therefore, it would be appropriate to set a dose-limit value of ~5 mSv corresponding to 75–80% of the individual exposure dose of radiological technologists in the department of nuclear medicine. The finding of this study may be used as reference data for setting future radiation dose limits.

scholarly journals Internal Radiation Monitoring of Occupational Staff in Nuclear Medicine Facility

2013 ◽  
Vol 5 (1) ◽  
pp. 63-70 ◽  
Author(s):  
MJ Ferdous ◽  
Z Alam ◽  
RK Khan ◽  
SM Iqubal ◽  
A Islam ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Medical Physics ◽  
Ventilation System ◽  
Working Environment ◽  
Urine Samples ◽  
Internal Exposure ◽  
Fume Hood ◽  
Effective Doses ◽  
Potential Risks ◽  
Dose Coefficients

Unsealed radioactive sources used in Nuclear Medicine Centers, to diagnose and treat patients, pose significant risks of internal exposure to the occupational staff. This work intends to evaluate the potential risks of internal contamination of occupational staff in Nuclear Medicine facilities. 49 urine samples of 19 occupational staff working in the two busiest nuclear medicine centres, namely Institute of Nuclear Medicine and Ultrasound (INMU) and Centre of Nuclear Medicine and Ultrasound (CNMU) Dhaka, were collected to perform this study. The concentrations of 99mTc and 131I in urine samples were measured using a High Purity Germanium (HPGe) detector. The radioactivity of 99mTc and 131I were found to be 8.58±0.03 Bql-1 to 314±1.92 Bql-1 and from 6.47±0.03 Bql-1 to 283±0.27 Bql-1 respectively. The effective doses of occupational staff have also been calculated using the radioactivity concentration and the dose coefficients. Due to the highest (314 Bql-1) and the lowest (8.58Bql-1) concentration of 99mTc, the effective doses were 14.7 ?Sv and 0.402?Sv, on the other hand for the highest (283 Bql-1) and the lowest (6.47 Bql-1) concentration of 131I, the effective doses were 5.58 ?Sv and 0.12 ?Sv. These values are within limits, however to avoid inhalation and contamination of 131I and 99mTc proper working environment should be established with suitable ventilation system, fume hood, mask, etc. DOI: http://dx.doi.org/10.3329/bjmp.v5i1.14670 Bangladesh Journal of Medical Physics Vol.5 No.1 2012 63-70

scholarly journals INFLUENCE OF THE CONSUMPTION OF DIFFERENT FOODSTUFFS ON THE INTERNAL EXPOSURE DOSE FORMATION IN THE ADULT POPULATION OF THE RUSSIAN FEDERATION AFTER THE ACCIDENT AT THE CHERNOBYL NPP

2018 ◽  
Vol 11 (2) ◽  
pp. 53-59 ◽  
Author(s):  
A. A. Bratilova ◽  
G. Ya. Bruk
Keyword(s):  
Russian Federation ◽  
Adult Population ◽  
Exposure Dose ◽  
Internal Exposure ◽  
Internal Dose ◽  
Chernobyl Npp ◽  
Region Data ◽  
The Russian Federation ◽  
The Impact

An The article is devoted to the peculiarities of the internal exposure dose formation in the adult population of the internal dose forming of the adult population of Russian Federation due to consumption of different foodstuffs in the remote period after the accident on at the Chernobyl NPP. Estimation of the impact of different foodstuffs is carried out in the forming of the mentioned doses; the foodstuffs mainly contributing in the internal dose forming formation are revealed. Based on the Bryansk region data, the comparing was fulfilled of the current food rations of population with the previous rations – of during the initial and intermediate postaccidental periods. It is illustrated how the differences in food rations affect the levels of exposure of the local inhabitants, which is necessary for the appropriate assessment of the internal exposure doses for population living in the contaminated territories.

Study of the Internal Exposure Monitoring and the New Monitoring Methods of Thyroid I-131 for Radiological Staff in Nuclear Medicine

2020 ◽  
Author(s):  
Gang Liu ◽  
Ye Li
Keyword(s):  
Drug Delivery ◽  
Nuclear Medicine ◽  
Basic Research ◽  
Medical Personnel ◽  
Gansu Province ◽  
Internal Exposure ◽  
Monitoring Methods ◽  
Simple Method ◽  
Exposure Monitoring ◽  
Activity Measurements

Abstract Background：In general, medical staff dealing with nuclear medicine should be entirely safe in their professional environment. Nevertheless, their exposure to radioactive iodine seems to be partially uncontrolled while they perform their duties, namely while administering iodine in the form of tablets or solutions or while taking care of the patients already treated with the isotope. Purpose: To verify such a hypothesis, develop a simple method for internal exposure monitoring，131I activity measurements in the thyroids of the personnel employed at the three hospitals of Gansu province grade a hospital nuclear medicine. Mastered the internal exposure of nuclear medical personnel.Methods: Choosing 20 employees of the department of three hospitals of gansu province grade a hospital nuclear medicine, which corresponds to circa 100% of all of the all the staff of the nuclear medicine department who carry out iodine therapy. Automatic packaging and drug delivery staffs were 6, manual packaging and drug delivery staffs were 14. According to the rules of the judgment principles proposed in IAEA safety guidelines, An InSpector 1000 portable spectrometer and its supporting software served as the basic research instrument. In four out of twenty examined staff members. The sitting position was adopted with NaI portable spectrometer. The measurement time was 120s. Result: Among the manual packaging and drug delivery staffs was 4 (20.0%) detected 131I in the thyroid, with activity range of 27.6-1030.3Bq. Automatic packaging and drug delivery staffs were not detected. Conclusions: The highest activities in thyroids were detected for the manual packaging and drug delivery staffs, Automatic packaging and drug delivery staffs were not detected. The dose of some workers is high, so the prevention and control of pollution in nuclear medicine discipline needs to be strengthened urgently.

scholarly journals Athletic Differences in the Characteristics of the Photoplethysmographic Pulse Shape: Effect of Maximal Oxygen Uptake and Maximal Muscular Voluntary Contraction

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Anran Wang ◽  
Lin Yang ◽  
Chengyu Liu ◽  
Jingxuan Cui ◽  
Yao Li ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Maximal Oxygen Uptake ◽  
Pulse Shape ◽  
Voluntary Contraction ◽  
Shape Effect ◽  
Peak Time ◽  
Pulse Area ◽  
Reflection Index ◽  
Dicrotic Notch ◽  
Pulse Peak

This study aimed to investigate the athletic differences in the characteristics of the photoplethysmographic (PPG) pulse shape. 304 athletes were enrolled and divided into three subgroups according to a typical sport classification in terms of the maximal oxygen uptake (MaxO2_low, MaxO2_middle and MaxO2_high groups) or the maximal muscular voluntary contraction (MMVC_low, MMVC_middle, and MMVC_high groups). Finger PPG pulses were digitally recorded and then normalized to derive the pulse area, pulse peak timeTp, dicrotic notch timeTn, and pulse reflection index (RI). The four parameters were finally compared between the three subgroups categorized by MaxO2or by MMVC. In conclusion, it has been demonstrated by quantifying the characteristics of the PPG pulses in different athletes that MaxO2, but not MMVC, had significant effect on the arterial properties.

scholarly journals Individual monitoring of internal exposure for nuclear medicine workers in Switzerland

2010 ◽  
Vol 144 (1-4) ◽  
pp. 464-467 ◽  
Author(s):  
S. Baechler ◽  
N. Stritt ◽  
F. O. Bochud
Keyword(s):  
Nuclear Medicine ◽  
Internal Exposure
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