ABSTRACT
Computed Tomography (CT) is an ionising radiation based imaging device. The study is aimed at characterizing scan parameters and reference levels using 2 and 16 slices CT scanners. It was an empirical study with 50 participants referred for brain CT scan using 2 and 16 slice CT scanners. Participation was voluntary and ethical clearance was obtained. During procedure the tube current and voltage were selected and the Volumetric Computed Tomography Dose Index (CTDIvol) obtained. Dose Length Product (DLP) was calculated by multiplying the CTDI with the total scan length. Descriptive statistical tool was used for data analysis and results presented in tables and charts. For 2 slices CT, the DLP reference ranges from 84.50mGy-cm to 398.08 mGy-cm. While for 16 slice CT, the CTDI and DLP reference range were 9.90 mGy to 59.06 mGy, and 116.10 mGy-cm to 586.36 mGy-cm respectively. The mean kVp and mAs for 2 slice CT were 87.60±10.91 and 108.20±8.28 respectively. There was a positive correlation between kVp and DLP yielding a Pearson’s correlation coefficient (r) of 0.252 with 2 slice CT scanner. With 16 slices CT there was also a positive correlation between DLP and mAs with a Pearson’s correlation coefficient (r) of 0.908. The mean kVp for 16 slice CT was higher than that of 2 slice CT while the mAs reference values for both 2 and 16 slices CT was 80.00 to 120.00. The study has provided information regarding the reference levels for 2 and 16 slice CT scanners.
References
- Robinson, E.D., Nzotta, C.C., & Onwuchekwa, I. (2019). Evaluation of scatter radiation to the thyroid gland attributable to brain computed tomography scan in Port Harcourt, Nigeria. International Journal of Research and Medical Sciences, 7, 2530-5
- Noriko, K., Takayasu, Y., Koji, O., Michiaki, K., Graham, B., & Joachim, S. (2020). Computed tomography of the head and the risk of brain tumours during childhood and adolescence: results from a case–control study in Japan. Journal of Radiological Protection, 40(10), 61-69
- Pearce, M.S. (2011). Pattern in paediatric CT use: an international and epidemiological perspective. Journal of Medical Imaging and Radiant Oncology, 55, 107-109
- Suliman, I.I., Abdalla, S.E., Ahmed, N.A., Galal, M.A., & Isam, S. (2011). Survey of Computed tomography technique and radiation dose in Sudanese hospitals. European Journal of Radiology, 80, 544-551
- Bushberg, J.T., Seibert, J.A., Leidholdt, R., Edwin, M., & Boone, J.M. X-Ray Production, X-Ray Tubes, and Generators. Essentials of physics of medical imaging (3rd ed.) Lippincott Williamas and Wilkins. (2020).
- Brenner, D.J., & Hall, E.J. Computed tomography—an increasing source of radiation exposure. Neglected English Journal of Medicine, (2007). 357, 2277-84
- Huda, W., Magill, D., & He, W. (2011). CT effective dose per dose length product using ICRP 103 weighting factors. Medical Physics, 38,1261–1265.
- Cao, C.F., Ma KL., Shan H., Liu TF., Zhao SQ., Wan Y., et al. (2022). CT Scans and Cancer Risks: A Systematic Review and Dose-response Meta-analysis. BMC Cancer, 22(1), 1-13
- Bashir, U., Jones, J., & Murphy, A., (2021). CT Dose Index. https://doi.org/10.53347/rID-18981.
- Deak, P.D., Smal, Y., & Kalender, W.A. (2010). Multi-section CT protocols: sex- and age-specific conversion factors used to determine effective dose from dose length product. Radiology, 257, 158–166
- Semghouli, S., Amaoui, B., Hakam, O.K., & Choukri, A. (2019). Radiation exposure during pelvimetry CT procedures in Ibn Sina Children’s Hospital of Rabat. Radiation Physics and Chemistry, 5(2), 79-83
- Mkimel, M., El Baydaoui, R., Mesradi, M.R., Tahiri, Z., Saad, E., & Hilali, A. (2019). Assessment of the radiation dose during 16 slices CT examinations. International Journal of Recent Technology and Engineering, 8(4), 2277-3878
- Abdullahi, M., Shittu, H., Joseph, D., Aribisala, A., Eshiett, E.P., & Richard, I. (2015). Diagnostic reference level for adult brain computed tomography scans: A case study of a tertiary health care center in Nigeria. IOSR Journal of Dental Medical Science, 14(1), 66-75
- Nzotta, C.C., Egbe, N., Adejoh, T., Nkubli, B.F., & Ezeador, I.S. (2016), Radiation dose from exposure to computed tomography scan of the brain in a reference hospital in Nigeria. Pakistani Journal of Radiology, 26 (2), 77-80
- Ogbole, G.I., & Obed, R (2014). Radiation doses in computed tomography: Need for optimization and application of dose reference levels in Nigeria. West African Journal of Radiology, 21(1), 1-6
- Hart, D., Wall, B., Hillier, M., & Shrimpton, P. (2010) Frequency and collective dose for medical and dental x-ray examination in the UK. Chilton Publisher.
- Foley, S.J., McEntee, M.F., Rainford, L. (2014). Establishment of CT diagnostic reference levels in Ireland. British Journal of Radiology, 85(1018), 1390-1397.
- Mekonin, T.S., & Deressu, T.T. (2022). Computed Dosimeter Dose Index on a 16-Slice Computed Tomography Scanner and Dose Response. Radiography, 20(3), 15-29.
- Adejoh, T., & Nzotta, C.C. (2016), Head Computed Tomography: Dose output and relationship with anthropotechnical parameters. West African Journal of Radiology, 23(2), 113-117
- Wardlaw GM, Martel N. (2016). Sci‐Thur PM–Colourful Interactions: Highlights 07: Canadian Computed Tomography Survey: National Diagnostic Reference Levels. Medical Physics. 43(8Part3): 4932-3
- Korir GK, Wambani JS, Korir IK, Tries MA, Boen PK. (2016). National diagnostic reference level initiative for computed tomography examinations in Kenya. Radiat Prot Dosimetry. 168(2): 242-52. doi: 10.1093/rpd/ncv020
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