scholarly journals The Comparison of Entrance Surface Radiation Dose to the Thyroid Gland Region in Different Dental Panoramic Radiography

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Siyambalagoda Gamage Manuja Dilan Yasiru ◽  
Ibashini Nuwan Kumari Herath ◽  
Bimali Sanjeevani Weerakoon
Keyword(s):  
Thyroid Gland ◽  
Radiation Dose ◽  
Panoramic Radiography ◽  
Surface Radiation

The Effect of Carbimazole Following Radioiodine Therapy on Radiation Dose to the Thyroid

1981 ◽  
Vol 20 (02) ◽  
pp. 72-75 ◽  
Author(s):  
R. Kocak ◽  
R.G. Herbert ◽  
C.R. Squire ◽  
T.M.D. Gimlette
Keyword(s):  
Thyroid Gland ◽  
Radiation Dose ◽  
Half Life ◽  
Radioiodine Therapy

Radioiodine in the thyroid gland after a therapy dose of 131I was measured serially in 7 patients without Carbimazole, and in 11 patients starting Carbimazole 60 mg daily fourteen days after the therapy dose. Effective half-life for radioiodine in the gland initially 5.53±1.08 days fell to 4.26±1.12 days (p < 0.01) during Carbimazole, and returned to 5.83±1.21 days (NS) after stopping the drug. The radiation dose to the thyroid from a given therapy dose of 131I followed by Carbimazole was calculated to be 97% of that without Carbimazole when the drug was started after 14 days, and 90% and 75% when the drug was started after 7 days and 1 day respectively.

scholarly journals ESTIMATION OF ENTRANCE SURFACE RADIATION DOSE TO THYROID REGION IN COMPUTED TOMOGRAPHY BRAIN EXAMINATION

2019 ◽  
Vol 12 (1) ◽  
pp. 121
Author(s):  
Visakh T ◽  
Suresh Sukumar ◽  
Abhimanyu Pradhan
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Maximum Dose ◽  
Surface Radiation ◽  
Ct Scans ◽  
Surface Dose ◽  
Brain Scan ◽  
Convenience Sampling ◽  
Ct Brain ◽  
Brain Examination

Objective: The objective of this study was to estimate the entrance surface radiation dose to the thyroid region in a computed tomography (CT) brain scan.Methods: Unfors Multi-O-Meter equipment was used to measure the entrance surface at the thyroid region of adult patients ranging from 18 to 70 years of age. A total of 115 patients were included in the study based on convenience sampling. The Multi-O-Meter was kept at the thyroid region during the scan, and the values for entrance surface dose (ESD) were noted from its monitor after the scan was complete.Results: The obtained data were analyzed and violate normal distribution; therefore, the median and quartiles were computed. The overall median (Q1, Q2), ESD of the patients, was 1.335 (1.213, 1.529) mGy. The minimum and maximum dose values recorded were 1.015 mGy and 1.964 mGy, respectively.Conclusions: The result showed a significant amount of entrance surface radiation dose to the thyroid region while taking a brain scan. This data can be used for optimization of radiation protection while undergoing CT scans of brain to reduce exposure to thyroid region.

scholarly journals Evaluation of Ionizing Radiation in Five Private Radiology Centers in Khuzestan

2020 ◽  
Author(s):  
Behzad Fouladi Dehaghi ◽  
Jamileh Deris ◽  
Maryam Mosavi Qahfarokhi ◽  
Ameneh Golbaghi ◽  
Leila Nematpour
Keyword(s):  
Radiation Dose ◽  
Ionizing Radiation ◽  
Gamma Spectroscopy ◽  
Surface Radiation ◽  
Annual Dose ◽  
Waiting Room ◽  
X Ray ◽  
Medicine Research ◽  
Ionization Radiation ◽  
Diagnostic Radiography

Background: Nowadays ionizing radiation is widely used in medicine, research and industry. In medicine, ionizing radiation is used to diagnose diseases and in high doses to treat diseases such as cancer. Undoubtedly, most exposure to artificial sources is in the field of medical and diagnostic radiology. Therefore, practitioners in the field of diagnostic radiography and patients are exposed to ionizing radiation and its risks. On the other hand, despite the advantages and efficacy of diagnostic radiation in the medical field, overall less attention is paid to optimizing and controlling protection in medical radiation. Therefore, the aim of this study was to evaluate the background ionizing radiation in Ahwaz diagnostic radiography centers. Methods: Ionization radiation levels were measured in and out of each center using gamma spectroscopy (Radiation Alert Inspector-EXP 15109) at a, b, c, d and e radiographic centers within one meter above the Earth's surface. Radiation levels within each center were measured at four locations (outside of center, secretary desk, and patient waiting room and behind the radiology room) both in X-ray machine operating and non-operating condition. The obtained data were analyzed by SPSS software.  Results: The inside ionization radiation dose in a, b, c, d and e radiographic centers were 0.121, 0.119, 0.126, 0132 and 0.128 μSv/h respectively. The outside ionization radiation dose in a, b, c, d and e radiographic centers were 0.094, 0.092, 0.093, 0.112 and 0.101 μSv/h respectively. Equivalent annual dose within and outside selected radiology centers were lower than the threshold (1 mSv / year). Conclusion: The results show that the ionizing radiation dose of the X-ray equipment examined in the radiology centers of Ahwaz is lower than the global standard.

scholarly journals Evaluation of the Absorbed Radiation Dose for Thyroid Gland in Chest Tumor Radiotherapy

2019 ◽  
Vol 105 (1) ◽  
pp. E745
Author(s):  
Y. Wang ◽  
L. He ◽  
M. Zheng ◽  
J. Wang ◽  
J. Xu ◽  
...  
Keyword(s):  
Thyroid Gland ◽  
Radiation Dose ◽  
Absorbed Radiation Dose

scholarly journals Absorbed Radiation Dose in Radiosensitive Organs Using 64- and 320-Row Multidetector Computed Tomography: A Comparative Study

Scientifica ◽  
2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Atif N. Khan ◽  
Waqas Shuaib ◽  
Boris Nikolic ◽  
Mohammad K. Khan ◽  
Jian Kang ◽  
...  
Keyword(s):  
Heart Rate ◽  
Thyroid Gland ◽  
Radiation Dose ◽  
Radiation Detectors ◽  
Imaging Protocol ◽  
Retrospective Gating ◽  
Absorbed Radiation Dose ◽  
Dose Modulation ◽  
Radiosensitive Organs ◽  
Gated Imaging

Aim. To determine absorbed radiation dose (ARD) in radiosensitive organs during prospective and full phase dose modulation using ECG-gated MDCTA scanner under 64- and 320-row detector modes.Methods. Female phantom was used to measure organ radiation dose. Five DP-3 radiation detectors were used to measure ARD to lungs, breast, and thyroid using the Aquilion ONE scanner in 64- and 320-row modes using both prospective and dose modulation in full phase acquisition. Five measurements were made using three tube voltages: 100, 120, and 135 kVp at 400 mA at heart rate (HR) of 60 and 75 bpm for each protocol. Mean acquisition was recorded in milligrays (mGy).Results. Mean ARD was less for 320-row versus 64-row mode for each imaging protocol. Prospective EKG-gated imaging protocol resulted in a statistically lower ARD using 320-row versus 64-row modes for midbreast (6.728 versus 19.687 mGy,P<0.001), lung (6.102 versus 21.841 mGy,P<0.001), and thyroid gland (0.208 versus 0.913 mGy;P<0.001). Retrospective imaging using 320- versus 64-row modes showed lower ARD for midbreast (10.839 versus 43.169 mGy,P<0.001), lung (8.848 versus 47.877 mGy,P<0.001), and thyroid gland (0.057 versus 2.091 mGy;P<0.001). ARD reduction was observed at lower kVp and heart rate.Conclusions. Dose reduction to radiosensitive organs is achieved using 320-row compared to 64-row modes for both prospective and retrospective gating, whereas 64-row mode is equivalent to the same model 64-row MDCT scanner.

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