The development of a diagnostic reference level on patient dose for CT examination in Korea

Cho, Pyongkon; Seo, Bokyung; Choi, Tae Keun; Kim, Jang Seob; Kim, You Hyun; Choi, Ji Hun; Oh, Yuw Han; Kim, Ki‐Hyun; Kim, Sunung

doi:10.1093/rpd/ncm463

Cited by 12 publications

(6 citation statements)

References 2 publications

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“…We would like to emphasize the importance of a quality control system for CT image quality and patient radiation exposure. Proper feedback, increased education and application of reference dose levels will be important tools to further reduce such institutional differences [9,14]. …”

Section: Discussionmentioning

confidence: 99%

Radiation Exposure from CT Examinations in Japan

et al. 2010

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BackgroundComputed tomography (CT) is the largest source of medical radiation exposure to the general population, and is considered a potential source of increased cancer risk. The aim of this study was to assess the current situation of CT use in Japan, and to investigate variations in radiation exposure in CT studies among institutions and scanners.MethodsData-sheets were sent to all 126 hospitals and randomly selected 14 (15%) of 94 clinics in Gunma prefecture which had CT scanner(s). Data for patients undergoing CT during a single month (June 2008) were obtained, along with CT scan protocols for each institution surveyed. Age and sex specific patterns of CT examination, the variation in radiation exposure from CT examinations, and factors which were responsible for the variation in radiation exposure were determined.ResultsAn estimated 235.4 patients per 1,000 population undergo CT examinations each year, and 50% of the patients were scanned in two or more anatomical locations in one CT session. There was a large variation in effective dose among hospitals surveyed, particularly in lower abdominal CT (range, 2.6-19.0 mSv). CT examinations of the chest and upper abdomen contributed to approximately 73.2% of the collective dose from all CT examinations. It was estimated that in Japan, approximately 29.9 million patients undergo CT annually, and the estimated annual collective effective dose in Japan was 277.4 *103 Sv person. The annual effective dose per capita for Japan was estimated to be 2.20 mSv.ConclusionsThere was a very large variation in radiation exposure from CT among institutions surveyed. CT examinations of the chest and upper abdomen were the predominant contributors to the collective dose.

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Section: Discussionmentioning

confidence: 99%

Radiation Exposure from CT Examinations in Japan

et al. 2010

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“…Contrast-enhanced images affected treatment plans making artefacts.High-radiation dose by CT scanner, also found by different studies 12 . Doses for CT scanners are quoted as CTDIw (CT dose index) with values in the region of 20 mGy 13 . This dose is delivered to regions of normal healthy tissue as well as the tumour volume.…”

Section: Discussionmentioning

confidence: 95%

“…12 Doses for CT scanners are quoted as CTDIw (CT dose index) with values in the region of 20 mGy. 13 This dose is delivered to regions of normal healthy tissue as well as the tumour volume. Manufacturers of CT scanners provide various methods to reduce the total dose to the patient, taking account of the different dimensions of the patient at different levels and modulating the exposure in response to the detector measurements.…”

Section: Drr Resolution Is Not Equal To Radiographicmentioning

confidence: 99%

Virtual simulation and treatment verification–merits and demerits: experience at Sindh Institute of Urology and Transplantation (SIUT), Pakistan

et al. 2009

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Background: The rapid changes in practice of radiotherapy have taken place over the past 5 years in Pakistan. With advent of computed tomography simulator, and multileaf collimators–assisted linear accelerators and electronic portal imaging system, few centres in Pakistan have switched from conventional radiotherapy to modern computer-based technology. Our hospital is first centre in Pakistan which is using virtual simulation since March 2006. We present our experience with list of merits and demerits.Design: Retrospective study.Patient collection: Medical records of all patients who received radiotherapy in our centre were reviewed. Parameters included were type of malignancy, type radiotherapy (curative/palliative), simulation and planning process time and the displacement of the beam-axis from the planning isocentre in clinical situations during three-dimensional conformal radiotherapy using electronic portal imaging device (EPID). Data were collected on written proforma. Percentages, frequencies, measures of central tendency and dispersion were calculated using SPSS version 17.0.Results: A total of 289 patients were treated from March 2006 to November 2008. Transitional cell carcinoma of urinary bladder was most common malignancy seen (42.4%) followed by prostate (28.62%) and renal cell carcinoma (14.14%). Of these 34.26% patients were treated on curative basis. The virtual simulation process could be completed in an average time of 5 min (SD 3.5). Under many cases, the treatment portals could be designed and the patient marked in one session. The displacements were recorded for 43 portals for early prostate cancer using an EPID system. The mean displacement was found 2.44 ± 0.8 mm in x (transverse), y (craniocaudal), and z (anteroposterior) directions during treatment. Standard deviation (SD) was 0.87 (90% CI 2.21–2.66). Average number of portals taken was 10 (6–27) per treatment session.Conclusion: Computer-based simulation and treatment over conventional methods is appropriate for curative patients, achieving more accurate tumour localisation, sparing normal organs at risk, reduced field sizes and a film free environment; however efforts are required to achieve maximum immobilisation during treatment.

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“…[4], [5] . 우리나라의 경우 CT검사 시 진단참고준위에 관한 연구 자료를 보면 두부 약 48 mGy, 복부 약 20 mGy 또는 참고문헌 7와 같다 [6], [7] . 법으로 (식 1)과 같이 정의한다 [9] .…”

Section: ⅰ Introductionunclassified

Patient Radiation Exposure Dose in Computed Tomography

Cho

2015

Journal of the Korean Society of Radiology

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In case of a CT examinations, there is a difference in the distribution of radiation dose from that of general X-ray equipments, and it has been known to cause a great radiation exposure during the examinations. However, owing to its high reliability on the accuracy of a examinations result, its use has increased continuously. In consideration of such a circumstance, the CT equipment, radiation dose during CT examinations, diagnostic reference level, and solutions to reduce radiation dose were mentioned on the basis of previously reported data. . 과거에는 CT가 새로워 졌다라고 할 경우 어떤 검사가 http://dx

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The development of a diagnostic reference level on patient dose for CT examination in Korea

Cited by 12 publications

References 2 publications

Radiation Exposure from CT Examinations in Japan

Radiation Exposure from CT Examinations in Japan

Virtual simulation and treatment verification–merits and demerits: experience at Sindh Institute of Urology and Transplantation (SIUT), Pakistan

Patient Radiation Exposure Dose in Computed Tomography

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