The European Radiation Dosimetry Group (EURADOS), in collaboration with Lawrence Livermore National Laboratory's (LLNL's) Thyroid Intercomparison Program (TRIP), conducted an intercomparison exercise consistent with the goals of EURADOS. In total, 35 in vivo radiobioassay facilities from 18 countries participated to evaluate the differences between the neck and thyroid phantoms specified in two standards issued by the American National Standards Institute. Radioiodine (125I and 131I) measurement results were compared to the traceable standard activity levels added to each phantom. Measurement data showed no statistically significant differences between normalized activity measurements of the thyroid phantom types (20 and 30 ml). Differences were noted between the laboratories that routinely participate in the radioiodine thyroid intercomparison program (TRIP participants) and laboratories that have not previously participated in TRIP. Evaluation of the reasons for these differences will require additional EURADOS-LLNL collaborations. Finally, the measurement data from this intercomparison was used with a designed intake scenario for intercomparison of dose evaluations. Results from the dose intercomparison will be presented in a subsequent article.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/rpd/ncx094 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Representative Organ Doses from Computed Tomography (CT) Exams from a Large International Registry.
Radiat Res
December 2024
Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California.
Estimation of absorbed organ doses used in computed tomography (CT) using time-intensive Monte Carlo simulations with virtual patient anatomic models is not widely reported in the literature. Using the library of computational phantoms developed by the University of Florida and the National Cancer Institute, we performed Monte Carlo simulations to calculate organ dose values for 9 CT categories representing the most common body regions and indications for imaging (reflecting low, routine, and high radiation dose examinations), stratified by patient age (in children) and effective diameter (in adults, using "diameter" as a measure of patient size). Our sample of 559,202 adult and 103,423 pediatric CT examinations was prospectively assembled between 2015-2020 from 156 imaging facilities from 27 healthcare organizations in 20 U.
View Article and Find Full Text PDFDose optimization of extended collimators in boron neutron capture therapy.
Biomed Phys Eng Express
December 2024
Shandong Key Laboratory of Neutron Science and Technology, International Academy of Neutron Science, Qingdao 266199, People's Republic of China.
In this paper, we propose the design of extending collimators aimed at reducing the radiation dose received by patients with normal tissues and protecting organs at risk in Boron Neutron Capture Therapy (BNCT). Three types of extended collimators are studied: Type 1, which is a traditional design; Type 2, which is built upon Type 1 by incorporating additional polyethylene material containing lithium fluoride (PE(LiF)); Type 3, which adds lead (Pb) to Type 1. We evaluated the dose distribution characteristics of the above-extended collimators using Monte Carlo methods simulations under different configurations: in air, in a homogeneous phantom, and a humanoid phantom model.
View Article and Find Full Text PDFAssessment of thyroid dose in orthopantomogram imaging with different thyroid shield materials: a Monte Carlo simulation study.
Radiat Prot Dosimetry
December 2024
Department of Oral and Maxillofacial Radiology, School of Dentistry, Yasuj University of Medical Sciences, Dr. Shahid Jalil St., Yasuj, Kohgiluyeh and Boyer-Ahmad Province, Iran.
Radiation protection in dental radiography can be achieved by adjusting the image field size, exposure, and filtration parameters, and using protective lead shields. The aim of this study is to assess the radiation dose delivered to the thyroid in a phantom irradiated by an orthopantomogram (OPG) system using Geant4 simulation toolkit. Recently, researchers have been trying to find an alternative material to the lead thyroid shield so that the OPG image has minimal metal artifacts.
View Article and Find Full Text PDFInvestigation of organs dosimetry precision using ATOM phantom and optically stimulated luminescence detectors in computed tomography.
Biomed Phys Eng Express
December 2024
Laboratory of Health Sciences and Technologies, Higher Institute of Health Sciences, Hassan 1st University, Settat, Morocco.
Article Synopsis
- * Significant discrepancies were found between the measured and estimated doses across various organs, with p-values consistently below 0.05, indicating the differences are statistically significant.
- * The findings suggest that OSLD measurements can provide a more accurate assessment of organ doses in CT imaging and highlight the need for improved dose estimation models to enhance patient care.
Detection and quantification of small and low-uptake lesions for differentiated thyroid carcinoma using non-time-of-flight iodine-124 PET/MRI.
Med Phys
November 2024
High-Field and Hybrid MR Imaging, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
Article Synopsis
- 124-iodine (I) is essential for PET diagnostics and therapy in differentiated thyroid cancer (DTC), but detecting small lesions (<10 mm) poses significant challenges due to low iodine uptake.
- The study aimed to evaluate the effectiveness of non-time-of-flight (TOF) PET/MRI in identifying and quantifying small DTC lymph node lesions under difficult imaging conditions.
- Results indicated that longer acquisition times, higher activity concentrations, and advanced reconstruction algorithms improved lesion visibility, with the smallest detectable size of 3.7 mm only visible under optimal settings.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!