Dimas Skam Joseph


Background: This study was motivated by the high incidence of cancer and the rapid growth of the radio-diagnostic industry in the Nigeria and globally.

Objectives: To investigate the errors during quality control tests conducted on three x-ray units.

Methods: kVp accuracy: exposures were made on the kVp meter starting from 50 kVp with increments of 10 kVp. kVp reproducibility: five exposures were also made at 70kVp and 20 mAs. Filtration check: three exposures were made on a digital dosimeter with different aluminium thickness placed on it. mAs / exposure timer linearity: three exposures were made on a digital dosimeter at 70kVp for each mAs selected. mAs / exposure timer reciprocity: three exposures were made on a digital dosimeter at 80kVp with three different combinations of mA and exposure time to yield 20mAs. Radiation out-put reproducibility: five exposures were made on a digital dosimeter using constant exposure factors. Beam alignment: exposure was made on an 18 x 24cm x-ray film with four coins were placed on either edge of the light field to make contact with each other. Radiation leakage: with the shutters tightly closed, dosimeters placed at 100cm from the x-ray tube were exposed at 125kVp and 250mAs.

Results: Shimadzu and DM-105N x-ray units failed kVp accuracy test with 05.06% and -08.58% error respectively. Also, the Siemens failed the mAs reciprocity 0.36% error. However, the three x-ray machines passed the other remaining QC tests.

Conclusions: The results obtained demonstrated an acceptable condition for all the x-ray machines. 

Keywords: Optimization, x-ray, quality control (QC) tests.

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The top 10 causes of death (Internet). (Place unknown): World Health Organization WHO (Last updated January 2017) Retrieved from http://www.who.int/mediacentre/factsheets/fs310/en/

Davis C. P. In Balentine J. R. (ed.) Cancer (Internet). (Place unknown): MedicineNet, Inc. (Last updated 12/1/2016) Retrieved from http://www.medicinenet.com/cancer/page2.htm

National Cancer Institute. Cancer Statistics (Internet). (Last updated March 14, 2016) USA; National Institute of Health NIH. Retrieved from https://www.cancer.gov/about-cancer/understanding/statistics

Cancer facts and figures 2016 (Internet). USA: American Cancer Society, Inc. Retrieved from http://www.cancer.org/research/cancer-facts-statistics/all-cancer-facts-figures/cancer-facts-figures-2016.html

Mandal A. What causes cancer? (Internet). (Place unknown): news-medical.net (Last updated March 21, 2013) Retrieved from http://www.news-medical.net/health/What-Causes-Cancer.aspx

United States Environmental Protection Agency US EPA. Radiation Sources and Dose (Internet). USA: EPA.gov (Last updated May 4, 2016) Retrieved from https://www.epa.gov/radiation/radiation-sources-and-doses

Valentin J. (ed.) Radiological protection in medicine. Annals of the International Commission on Radiological Protection, ICRP-105 (2008). Elsevier pp.15 – 19

Radiation Health Unit of Department of Health China (n.d) Deterministic effects and stochastic effects (Internet). China. Retrieved January 15, 2017, from http://www.hko.gov.hk/prtver/pdf/docs/education/dbcp/rad_health/eng/r4_1.pdf

NDT Resource Centre (n.d) Biological effects (Internet). US; National Science Foundation NSF (Retrieved January 15, 2017, from https://www.nde-ed.org/EducationResources/CommunityCollege/RadiationSafety/biological/stochastic/stochastic.htm

R. Julian Preston Committee 1. Radiation effects. International Commission on Radiological Protection ICRP Symposium on the International System of Radiological Protection October 24-26, 2011 – Bethesda, MD, USA

Valentin J. (ed.) The 2007 Recommendations of the International Commission on Radiological Protection. Annals of the International Commission on Radiological Protection, ICRP-103 (2007). Elsevier pp. 10 -16

Jaquith K. 7 ALARA principles for reducing radiation exposure (Internet). (Place unknown): Universal Medical Inc. (last updated November 25, 2013) Retrieved from http://blog.universalmedicalinc.com/7-alara-principles-for-reducing-radiation-exposure/

ALARA “As Low as Reasonably Achievable”(Internet). US: Medical Imaging Technologies. Retrieved January 19, 2017 from http://www.medicalimagingtech.com/alaraachieve

Marco Aurelio de Sousa Lacerda, Teogenes Augusta da Silva and Arno Heeren de Oliveira.The Methodology for evaluating half value layer and its influence on the diagnostic radiology. Radiol Bras (2007)Vol.40 No.5. Online version ISSN 1678 – 7099

Papp, J. Quality Management in the Imaging Sciences. (2006) 3rd Edition. Pp. 84-105

Criteria for acceptability of Radiological (including Radiotherapy) and nuclear Medicine installations. Radiation Protection No.91 (Internet). (Place unknown); europa.eu Retrieved February 6, 2017 from https://ec.europa.eu/energy/sites/ener/files/documents/091_en.pdf

EMERALD - Physics of Diagnostic Radiology. X-ray tube and generator (Internet). Pp. 56 – 60 Retrieved February 6, 2017 from http://www.emerald2.eu/workbooks/dr5.pdf

X-ray safety- theory and practice. Section 4: General radiography (Internet). (Place unknown). Retrieved February 6, 2017 from http://www.xrayfocus.info/qc/harptest/moh_guide/section04.html#LEAK

Akpochafor MO, Omojola AD, Soyebi KO, Adeneye SO, Aweda MA, Ajayi HB. Assessment of peak kilovoltage accuracy in ten selected X-ray centers in Lagos metropolis, South-Western Nigeria: A quality control test to determine energy output accuracy of an X-ray generator. J Health Res Rev [serial online] 2016 [cited 2017 Feb 6];3:60-5. Available from: http://www.jhrr.org/text.asp?2016/3/2/60/184231

LeBlanc L. Quality control in radiography- Linearity of a general x-ray unit (Internet). (Last updated March 24, 2015) Retrieved from http://qcinradiography.weebly.com/linearity

M. C. Okeji, F. U. Idigo, A.C Anakwue, U. B. Nwogu and I. O. Meniru. Status of light beam diaphragm and its implication in radiation protection. World Applied Sciences Journal 2016; 34(7): 975- 978.


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