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Estimation of Radiation Dose to the Eye Lens in Cranial Computed Tomography Examinations in Federal Neuro-Psychiatric Hospital Maiduguri, Borno State, Nigeria |
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PP: 205-212 |
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doi:10.18576/jrna/090301
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Author(s) |
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Shuaibu U. Hambali,
Ibrahim Umaru,
Samson D. Yusuf,
Idris M. Mustapha,
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Abstract |
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| In this study, the amount of dose to the eye lens of patients undergoing cranial CT examination at Federal Neuro-Psychiatric Hospital Maiduguri was assessed. Sixty patients were recruited randomly based on patients consent. Thermo luminescence Dosimeter chips were placed directly above the eye lens for dose measurement and evaluation. The TLDs were retrieved after exposure and were taken to the Centre for Energy Research and Training (CERT) Zaria for dose estimation using a TLD reader. The tube voltage and tube current ranged from 80 kVp to 140 kVp and 110 mAs to 140 mAs respectively. The result indicates that the cumulative doses to the eye lens for pediatric, young adults and adults ranged from (0.61 to 1.76) mGy, (1.34 to 7.52) mGy, and (1.81 to 8.69) mGy respectively. The entrance surface dose (ESD) to the eye lens of patients who underwent cranial CT radiography in Federal Neuro-Psychiatric Hospital Maiduguri is within the threshold level of 500 mGy as prescribed by the International Standards Organization on Radiation Protection. Therefore, this study concludes that the procedure of cranial CT examination at Federal Neuro-Psychiatric Hospital Maiduguri is clinically safe and the ALARA principle is being practiced. |
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