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Establishment of Diagnostic Reference Level (DRL) for Computed Tomography (CT) Examinations from Selected Hospitals in Sri Lanka

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dc.contributor.author Gunathilake, WAD
dc.contributor.author Thenuwara, HK
dc.contributor.author Wijebandara, HMSS
dc.contributor.author Sathyathas, P
dc.contributor.author Samarasinghe, UC
dc.date.accessioned 2020-12-20T22:16:54Z
dc.date.available 2020-12-20T22:16:54Z
dc.date.issued 2018
dc.identifier.uri http://ir.kdu.ac.lk/handle/345/2751
dc.description.abstract Computed Tomography (CT) examinations deliver higher patient dose in comparison with other conventional x-ray examinations. The aim of this study was to establish local diagnostic reference levels (DRLs) for selected CT examinations. This was a cross-sectional study investigating local DRL in selected hospitals from 16 and 640 slice CT scanners in Sri Lanka. Three hundred and fifty adult patients who underwent CT scans of non-contrast and contrast brain, contrast enhanced chest, HRCT chest, KUB, contrast enhanced abdomen and chest-abdomen examinations were included. Patients’ parameters (height, weight, age and sex) and CT scan parameters (kVp, effective mAs, total scan time, slice thickness, CTDI (vol) and DLP) were collected. The mean age of the patients was 53.25(±16) years and the age range was 19 - 89 years. Local DRLs were proposed to establish as the 75th percentile of CTDI(vol) and the DLP values of NC- brain, CE-brain, KUB, CE-chest, HRCT, CE-abdomen and Chest-abdomen obtained from the 16 slice CT machine. LDRLs for adult examinations determined for NC- brain, CE-brain, KUB, CE-chest, HRCT, CE-abdomen and Chest-abdomen in terms of CTDI(vol) were 70.90 mGy, 141.8 mGy, 11.80 mGy, 17.70 mGy, 12.80 mGy, 45.27 mGy and 27.02 mGy respectively. Effective doses for the examinations NC-brain, CE-chest and CE-abdomen were 2.60 mSv, 7.65 mSv and 20.7 mSv respectively and they were higher than the AAPM reference levels. The study’s DRLs values were generally higher than the ICRP 2007 recommended values. Moreover according to the research, DRLs values of the commonest CT examinations were generally higher than the DRLs values of some other countries, requiring further optimization process for these determined DRLs. en_US
dc.language.iso en en_US
dc.subject Computed Tomography (CT) en_US
dc.subject Volumetric Computed Tomography Dose Index (CTDI(vol)) en_US
dc.subject Dose Length Product (DLP) en_US
dc.subject Diagnostic Reference Level (DRL) en_US
dc.title Establishment of Diagnostic Reference Level (DRL) for Computed Tomography (CT) Examinations from Selected Hospitals in Sri Lanka en_US
dc.type Article Full Text en_US
dc.identifier.journal KDU IRC en_US
dc.identifier.pgnos 34 en_US


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