Document Type : Original Article
Authors
- Peter Ekwulugwo Ojike 1
- Chikwendu Emenike Orji 2
- Kelechukwu Bierechi Okeoma 2
- Chinyere Ada Madu 2
- Usman Rilwan 3
1 Radiography Unit, Department of Radiology, Federal University Teaching Hospital Owerri (Formerly, Federal Medical Center Owerri), Imo State Nigeria
2 Department of Physics, Federal University of Technology Owerri, Imo state, Nigeria
3 Department of Physics, Nigerian Army University, Biu, Borno State, Nigeria
Abstract
The work aimed at establishing DRLs for adult CT examination of the head in Rivers State, Nigeria. The dose report and scan parameters for adult Head examination was retrospectively surveyed during the study period of four months in three CT center. Sixty-nine patient folders, comprising twenty-five subjects for center A, twenty-three subjects for center B, and twenty-one subjects for center C were included. Data on CT dose index (CTDIvol) and dose length product (DLP) displayed on CT scanner console from three (3) selected hospitals were recorded for each facility. The percentile (75th) was assessed for all centers to set up center-unique DRLs. Lastly, a summed percentile (75th) for mean of DLP and CTDIv in the entire centers was assessed to obtain DRLs in adult Head examinations across investigated area. Facts were analyzed with the aid of SPSS (version 25.0). The modern files (digital) of 24 female and 45 male patients with age bracket 16-100 years old were analyzed. Centre-unique percentile (75th) of mean DLP and CTDIv of three centers A, B, and C were 39 mGy and 820 mGy.cm, 70.9 mGy, and 1330 mGy.cm, 55 mGy, and 1158 mGy.cm, respectively. The head CT examination DRLs for the area was 54.9 mGy and 1103 mGy.cm. The Head CT examination’s DRLs for the state of Rivers has been obtained. Nonetheless, variation between CT scan center was noted, CTDIvol is lower than recommendations of European Commission (EC) of 60mGy. The DLP is slightly supper than EC value of 1000 mGy.cm. Personnel training and more awareness on optimization of dosage may still aid to further guide down the dosage of radiation within the location compared to international values. Therefore, centers with fairly lower values than the state derived DRLs (LDRL) should retain their values, while those whose values are higher should implement dose optimization.
Graphical Abstract
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Keywords
- Dose Optimization
- Computed Tomography
- Diagnostic Reference Levels
- Volume Computed Tomography Dose Index
- Dose Length Product
Main Subjects
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