Establishment of diagnostic reference levels arising from common CT examinations in Semnan County, Iran

• Autorzy: Khoramian Daryoush , Sistani Soroush , Hejazi Peyman

Identyfikatory

DOI

10.2478/pjmpe-2019-0008

• Języki publikacji: EN

Abstrakty

EN

Objective: The literature has approved that the use of the concept of diagnostic reference level (DRL) as a part of an optimization process could help to reduce patient doses in diagnostic radiology comprising the Computed Tomography (CT) examinations. There are four public/governmental CT centers in the province (Semnan, Iran) and, to our knowledge, after about 12 years since the launch of the first CT scanner in the province there is no dosimetry information on those CT scanners. The aim of this study was to evaluate CT dose indices with the aim of the establishment of the DRL for head, chest, cervical spine, and abdomen-pelvis examinations. Methods: Scan parameters of 381 patients were collected during two months from 4 CT scanners. The CT dose index (CTDI) was measured using a calibrated ionization chamber on two cylindrical poly methyl methacrylate (PMMA) phantoms. For each sequences, weighted CTDI (CTDIw), volumetric CTDI (CTDIv) and dose length product (DLP) were calculated. The 75th percentile was proposed as the criterion for DRL values. Results: Proposed DRL (CTDIw, CTDIv, DLP) for the head, chest, cervical spine, and abdomen-pelvis were (46.1 mGy, 46.1 mGy, 723 mGy × cm), (13.8 mGy, 12.0 mGy, 377 mGy × cm), (40.0 mGy, 40.0 mGy, 572 mGy × cm) and (14.9 mGy, 12.1 mGy, 524 mGy × cm), respectively. Conclusion: Comparison with the others results from the other countries indicates that the head, chest and abdomen-pelvis scans in our region are lower or in the range of the other studies investigated in terms of dose. In the case of cervical spine scanning it’s necessary to review and regulate scan protocols to reach acceptable dose levels.

Słowa kluczowe

EN

Diagnostic Reference Level; CT scanning; CT dose indices

• Wydawca: Polskie Towarzystwo Fizyki Medycznej
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2019
• Tom: Vol. 25, Iss. 1
• Strony: 51--55
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Khoramian Daryoush

• Department of Medical Physics, Student Research Committee, Faculty of Medicine, Semnan University of Medical Science

autor

Sistani Soroush

• Department of Medical Physics, Student Research Committee, Faculty of Medicine, Semnan University of Medical Science

autor

Hejazi Peyman

• Department of Medical Physics, Student Research Committee, Faculty of Medicine, Semnan University of Medical Science

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).