A strategy to optimize radiation exposure for non-contrast head CT: comparison with the Japanese diagnostic reference levels

Kumamaru, Kanako K.; Kogure, Yosuke; Suzuki, Michitaka; Hori, Masaaki; Nakanishi, Atsushi; Kamagata, Koji; Hagiwara, Akifumi; Andica, Christina; K, Ri; Houshido, Naoyoshi; Aoki, Shigeki

doi:10.1007/s11604-016-0545-3

Cited by 9 publications

(11 citation statements)

References 2 publications

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“…A survey of CT dosage in Syria was conducted in 2009 and thus is relatively old with no updates available. Table 5 shows a comparison of the CTDI vol and DLP results with those of Australia (2015), ACR DIR (2016), Japan (2015), the EU (2014), Greece (2014), Egypt (2017), and ICRP (2007) [3,[16][17][18]. The values in this study were approximately lower than and comparable with those reported in other studies.…”

Section: Discussionsupporting

confidence: 77%

Computed tomography radiation doses for common computed tomography examinations: a nationwide dose survey in United Arab Emirates

et al. 2020

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Objectives: Computed tomography (CT) scanning is an essential part of diagnostic and treatment plans, providing swift and accurate diagnostic images. The aim of this study is to develop diagnostic reference levels (DRLs) for the adult common CT examination in the United Arab Emirates (UAE). Methods: This study presents results of the survey of CT dose indices. The data were collected from 91% of the scanners registered at the Ministry of Health and Prevention (MOHAP) for five common examinations: head, chest, and abdomen-pelvis with and without CM. Results: CT dose index, dose-length product, and patient weight were analyzed; the reference dose was calculated on the 75th percentile, and an achievable dose was proposed from the median value. The results were compared with the UAE initial National Dose Report as well as the international reports. The proposed dose for CTDI vol (mGy) and DLP (mGy cm) is as follows: head without CM 40 and 695, head with CM 48 and 820, chest 10 and 275, abdomen-pelvis without CM 14 and 810, and abdomen-pelvis with CM 20 and 1025. Conclusions: The results show low dose variations between the MOHAP scanners. The data also revealed CTDI vol and DLP values comparable to those in the initial NDRL report and international standards. The establishment of diagnostic reference levels will require a continuous dose monitoring system.

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Section: Discussionsupporting

confidence: 77%

Computed tomography radiation doses for common computed tomography examinations: a nationwide dose survey in United Arab Emirates

et al. 2020

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Section: Discussioncontrasting

confidence: 50%

“…The 3 rd quartile for CTDIvol and the effective dose values (Table 3) for the head imaging protocol (65.1 mGy, 2.83 mSv, respectively) were lower than the 3 rd quartile measured in some previous studies 19,34,35,37,39 , and higher than the 3 rd quartile measured in other studies 10,20,26,28,32,36,38,40,41,50, 52 . Similarly, the 3 rd quartile for CTDIvol and the effective dose values (Table 4) for the chest imaging protocol (16.6 mGy, 8.21 mSv, respectively) were lower than the 3 rd quartile measured in some previous studies 20, 23,35,50 , and higher than the 3 rd quartile measured in other studies 10,18,26,28-29,32,34,37-40, 52 . Moreover, the 3 rd quartile for CTDIvol and the effective dose values (Table 5) for the abdomen-pelvis imaging protocol (17.9 mGy, 13.9 mSv, respectively) were lower than the 3 rd quartile measured in some previous studies 20, 23,34,35,41 , and higher than the 3rd quartile measured in other studies 10,18,26,28-29,31,32,36-40,50,51 .…”

Section: Discussioncontrasting

confidence: 50%

“…The values are shown in comparison with other similar international studies for the same CT imaging protocols. 19 15.0 724 10.86 SWITZERLAND 2013 29 15.0 650 9.75 IRSN FRANCE 2013 26 17.0 800 12.00 ICRP 2010 15 35.0 780 11.70 AUSTRALIA 2020 50 13.0 600 9.00 US 2017 32 16.0 781 11.72 CANADA 2016 34 18.0 874 13.11 JAPAN 2016 35 20.0 1000 15.00 GREECE 2011 23 35 12.0 5.89 SWITZERLAND 2013 29 10.0 5.60 IRSN FRANCE 2013 26 15.0 6.65 ICRP 2010 15 35.0 9.10 AUSTRALIA 2020 50 10.0 5.46 US 2017 32 16.0 6.20 CANADA 2016 34 14.0 7.29 JAPAN 2016 35 20.0 7.70 GREECE 2011 23 30.0 9.10 GREECE 2015 36 14.0 6.72 EGYPT 2017 20 22.0 5.88 UK 2011 10 15.0 4.90 IRELAND 2012 37 11.0 5.46 IRAN 2019 38 12.0 5.27 TURKEY 2015 39 11.6 4.05 TURKEY 2021 40 8.3 4.40 SYRIA 2010 41 22.0 7.28 MALAYSIA 2016 51 19.9 8.40 Effective dose coefficient or conversion coefficient k=0.014 9,[17][18][19]…”

Section: Resultsmentioning

confidence: 99%

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Establishment of national diagnostic dose reference levels (DRLs) for routine computed tomography examinations in Jordan

Radaideh

Al-Radaideh

Saleh

et al. 2023

Polish Journal of Medical Physics and Engineering

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Background: Dose reference levels (DRLs) are used as indicators as well as guidance for dose optimization and to ensure justification of appropriate dose for a given clinical indication. The main aims of this study were to establish local DRLs for each CT imaging protocol as a reference point to evaluate the radiation dose indices and to compare our DRLs with those established in other countries and against the internationally reported guidelines. Materials and methods: 2000 CT dose reports of different adult imaging protocols from January 2021 until April 2022 were collected retrospectively at different hospitals in Jordan. Data were collected from CT scans that were performed using different types and models of CT scanners and included four adult non-enhanced, helical CT imaging protocols; Head, Chest, Abdomen-Pelvis, and Chest-Abdomen-Pelvis. Results: The average doses of CTDIvol, DLP, and effective dose were (65.11 mGy, 1232.71 mGy·cm, 2.83 mSv) for the head scan, (16.6 mGy, 586.6 mGy·cm, 8.21 mSv) for the chest scan, (17.91 mGy, 929.9 mGy·cm, 13.9 mSv) for the abdomen-pelvis scan, and (19.3 mGy, 1152 mGy·cm, 17.25 mSv) for the chest-abdomen-pelvis scan. In comparison with results from different international studies, DLP values measured in the present study were lower for the chest-abdomen-pelvis and abdomen-pelvis CT scans, and higher for the head CT and chest CT scans. Conclusions: It is very important that each country establishes its own DRLs and compares them with those reported by other countries, especially the developed ones. It is also important that these levels are regularly updated.

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“…In Japan, the latest diagnostic reference levels (DRLs) were published in 2015 [ 15 ] and do not yet reflect values obtained using SSDE. As such, a number of studies have explored the evaluation of SSDE [ 7 , 8 , 16 ]. In addition, many companies and public organizations have developed software programs for evaluating the organ dose and effective dose from CT examinations since the announcement of SSDE.…”

Section: Introductionmentioning

confidence: 99%

Consideration of the usefulness of a size-specific dose estimate in pediatric CT examination

Tsujiguchi

Obara

Ono

et al. 2018

Journal of Radiation Research

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Computed tomography (CT) has recently been utilized in various medical settings, and technological advances have resulted in its widespread use. However, medical radiation exposure associated with CT scans accounts for the largest share of examinations using radiation; thus, it is important to understand the organ dose and effective dose in detail. The CT dose index and dose–length product are used to evaluate the organ dose. However, evaluations using these indicators fail to consider the age and body type of patients. In this study, we evaluated the effective dose based on the CT examination data of 753 patients examined at our hospital using the size-specific dose estimate (SSDE) method, which can calculate the exposure dose with consideration of the physique of a patient. The results showed a large correlation between the SSDE conversion factor and physique, with a larger exposure dose in patients with a small physique when a single scan is considered. Especially for children, the SSDE conversion factor was found to be 2 or more. In addition, the patient exposed to the largest dose in this study was a 10-year-old, who received 40.4 mSv (five series/examination). In the future, for estimating exposure using the SSDE method and in cohort studies, the diagnostic reference level of SSDE should be determined and a low-exposure imaging protocol should be developed to predict the risk of CT exposure and to maintain the quality of diagnosis with better radiation protection of patients.

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A strategy to optimize radiation exposure for non-contrast head CT: comparison with the Japanese diagnostic reference levels

Abstract: We report the successful implementation of a new protocol with reduced radiation exposure for non-contrast head CT examinations.

Cited by 9 publications

References 2 publications

Computed tomography radiation doses for common computed tomography examinations: a nationwide dose survey in United Arab Emirates

Computed tomography radiation doses for common computed tomography examinations: a nationwide dose survey in United Arab Emirates

Establishment of national diagnostic dose reference levels (DRLs) for routine computed tomography examinations in Jordan

Consideration of the usefulness of a size-specific dose estimate in pediatric CT examination

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