Showing papers by "Mehdi Sohrabi published in 2018"
TL;DR: One effective approach for optimization of the CT examination protocols at the national level is the provision of an adequate standardized training of the radiologists, technicians and medical physicists on the patient radiation protection principles and implementation of the DRL concept in clinical practices.
Abstract: National diagnostic reference levels (NDRLs) of Iran were determined for the four most common CT examinations including head, sinus, chest and abdomen/pelvis. A new 'quality control (QC)-based dose survey method', as developed by us, was applied to 157 CT scanners in Iran (2014-15) with different slice classes, models and geographic spread across the country. The NDRLs for head, sinus, chest and abdomen/pelvis examinations are 58, 29, 12 and 14 mGy for CTDIVol and 750, 300, 300 and 650 mGy.cm for DLP, respectively. The 'QC-based dose survey method' was further proven that it is a simple, accurate and practical method for a time and cost-effective NDRLs determination. One effective approach for optimization of the CT examination protocols at the national level is the provision of an adequate standardized training of the radiologists, technicians and medical physicists on the patient radiation protection principles and implementation of the DRL concept in clinical practices.
15 citations
TL;DR: In this paper, a panorama single-cell mega-size electrochemical etching (MS-ECE) image detection system was proposed to detect hydrogen ion (proton) images.
14 citations
10 citations
TL;DR: A new “quality-control-based (QC-based) dose survey method” has been developed for determination of diagnostic reference levels (DRL) in Computed Tomography examinations, based on the use of retrospective data in the QC documents and reports, which are typically available from the National Regulatory Authority database.
Abstract: A new “quality-control-based (QC-based) dose survey method” has been developed for determination of diagnostic reference levels (DRL) in Computed Tomography (CT) examinations. The “QC-based dose survey method” is based on the use of retrospective data in the QC documents and reports, which a
7 citations
TL;DR: In this article, the accuracy of the Smythe equation was analyzed in polycarbonate under 50 Hz - 32 KV cm −1 fixed field strength, and the flat alpha detection efficiency and track diameter versus thickness responses for alpha energies studied under fixed field strengths were in good agreement with Smythe equations.
6 citations
TL;DR: A prospective dual-purpose quality control dosimetry protocol is proposed for determination of diagnostic reference levels in a country, which can be simply applied by quality control service providers.
Abstract: A diagnostic reference level is an advisory dose level set by a regulatory authority in a country as an efficient criterion for protection of patients from unwanted medical exposure. In computed tomography, the direct dose measurement and data collection methods are commonly applied for determination of diagnostic reference levels. Recently, a new quality-control-based dose survey method was proposed by the authors to simplify the diagnostic reference-level determination using a retrospective quality control database usually available at a regulatory authority in a country. In line with such a development, a prospective dual-purpose quality control dosimetry protocol is proposed for determination of diagnostic reference levels in a country, which can be simply applied by quality control service providers. This new proposed method was applied to five computed tomography scanners in Shiraz, Iran, and diagnostic reference levels for head, abdomen/pelvis, sinus, chest, and lumbar spine examinations were determined. The results were compared to those obtained by the data collection and quality-control-based dose survey methods, carried out in parallel in this study, and were found to agree well within approximately 6%. This is highly acceptable for quality-control-based methods according to International Atomic Energy Agency tolerance levels (±20%).
1 citations