Background: HVL in diagnostic X-ray machines is an important property for defining the penetration ability of an X-ray beam into the human body and, hence, the beam hardness. Materials and Methods: The study utilized the findings of the radiation safety inspections conducted between 2022 and 2023 to investigate the variation of the Half-value layer (HVL) with dose output, taking 64 X-ray machines based on a set criterion. Results: A total of 26 X-ray machines failed the HVL test, while 38 passed the HVL test. Of the 38 that passed the test, 14 had very high and extremely high HVLs and produced doses below the lower limit of the permissible range of 0.025 - 0.08 mGy/mAs. The corrective action for 26 machines that generally failed the HVL test was to minimize the filtration by removing the filter plates. However, this had to be done only after a conclusive investigation to check the accuracy of tube current (mA), timer (s), and tube potential (kVp) parameters. Conclusion: Therefore, the regulatory body recommends that HVL tests be part of the acceptance and commissioning tests for the new machines in Uganda and be done routinely for the machines in use, as specified in the quality control program for each X-ray machine.
References
[1]
Sprawls, P. (2001) The Physical Principles of Medical Imaging. 2nd Edition, Wiley.
[2]
Amoako, G. and Owusu, I. (2018) Assessment of Some Selected Conventional Diagnostic X-Ray Facilities at Cape-Coast in the Central Region of Ghana. Austin Journal of Radiology, 2, 1-4.
[3]
Gallini, R.E., Belletti, S., Berna, V., Giugni, U. and Prandelli, G. (1995) A Simple Test for X Ray Tube Filtration. Radiation Protection Dosimetry, 57, 253-256. https://doi.org/10.1093/oxfordjournals.rpd.a082536
[4]
IAEA (2023) Handbook of Basic Quality Control Tests for Diagnostic Radiology (IAEA Human Health Series No. 47) (Issue 47). https://www.iaea.org/publications/14890/handbook-of-basic-quality-control-tests-for-diagnostic-radiology
[5]
Huda, W. and Abrahams, R.B. (2015) Radiographic Techniques, Contrast, and Noise in X-Ray Imaging. American Journal of Roentgenology, 204, W126-W131. https://doi.org/10.2214/ajr.14.13116
[6]
Behrman, R.H. and Yasuda, G. (1998) Effective Dose in Diagnostic Radiology as a Function of X-Ray Beam Filtration for a Constant Exit Dose and Constant Film Density. Medical Physics, 25, 780-790. https://doi.org/10.1118/1.598260
[7]
McBroome, M., Chase, J., Farmer, D. and Mourant, N. (2021) The Use of Filtration in Diagnostic X-Ray Imaging. 2021 Undergraduate Research Showcase.
[8]
Poletti, J.L. (1994) Factors Affecting Patient Dose in Diagnostic Radiology.
[9]
Faulkner, K., Christofides, S., Lillicrap, S., Horton, P. and Malone, J. (2012) Criteria for Acceptability of Medical Radiological Equipment used in Diagnostic Radiology, Nuclear Medicine and Radiotherapy. Radiation Protection No. 162 (Issue May).
[10]
International Atomic Energy Agency (IAEA) (2014) Diagnostic Radiology Physics: A Handbook for Teachers and Students.
[11]
International Commission on Radiological Protection (ICRP) (1982) Protection of the Patient in Diagnostic Radiology. A Report of Committee 3 of the International Commission on Radiological Protection. Annals of the ICRP, 9, 1-82.
[12]
Lacerda, M.A.D.S., Silva, T.A., Da Oliveira, A.H., De, Da Silva, T.A. and De Oliveira, A.H. (2007) The Methodology for Evaluating Half-Value Layer and Its Influence on the Diagnostic Radiology. Radiologia Brasileira, 40, 331-336.
[13]
Farr, R.F. (1955) The Specification of Roentgen Ray Output and Quality. Acta Radiologica, 43, 152-160. https://doi.org/10.3109/00016925509172758
[14]
Trout, E.D., Kelley, J.P. and Lucas, A.C. (1960) Determination of Half-Value Layer. The American Journal of Roentgenology, Radium Therapy, and Nuclear Medicine, 84, 729-740.
[15]
Ahmed, S.N. (2015) Solid-State Detectors. In: Physics and Engineering of Radiation Detection, Elsevier, 259-329. https://doi.org/10.1016/b978-0-12-801363-2.00005-x
[16]
RaySafe (2018) RaySafe X2 User Manual. https://www.flukebiomedical.com/sites/default/files/resources/5001083-raysafe_x2-manual-en-7.pdf
[17]
AAPM (2002) AAPM Report No. 74: Quality Control in Diagnostic Radiology. https://www.aapm.org/pubs/reports/detail.asp?docid=73
[18]
European Commission: Directorate-General for Research and Innovation (1996) European Guidelines on Quality Criteria for Diagnostic Radiographic Images. Publications Office.
[19]
Godfrey, L.D., Adeyemo, D.J. and Sadiq, U. (2015) Radiological kVp Accuracy, Reproducibility and Consistence Assessment of Some Hospitals in Zaria Environs of Kaduna State, Nigeria. Scholars Research Library Archives of Applied Science Research, 7, 27-31.
[20]
Hjouj, M., Budeiri, D., Rajabi, A., Abu Khalaf, S. and Jghama, D. (2022) Assessment of Peak Voltage Accuracy and Reproducibility of Conventional X-Radiography Units in Palestine. Proceedings of the 2022 5th International Conference on Digital Medicine and Image Processing, Kyoto, 10-13 November 2022, 50-57. https://doi.org/10.1145/3576938.3576947
[21]
Kartika, T. and Savitri, L. (2020) Radiation Safety Assessment on The Use of Portable X-Ray for General Radiography. Case Study: Portable X-Ray of X-Manufacture. 2020 Annual Nuclear Safety Seminar (SKN), Jakarta, 26 October 2020, 123-128. https://inis.iaea.org/records/fzkg3-h8j47
[22]
Nevada Division of Public and Behavioral Health (DPBH) (2023) Use Limitations for Portable and Mobile X-Ray Machines. https://nvose.org/use-limitations-for-portable-and-mobile-x-ray-machines/
[23]
Kadri, O. and Alfuraih, A. (2019) Photon Energy Absorption and Exposure Buildup Factors for Deep Penetration in Human Tissues. Nuclear Science and Techniques, 30, Article No. 176. https://doi.org/10.1007/s41365-019-0701-4
[24]
Sandell, J.L. and Zhu, T.C. (2011) A Review of In-Vivo Optical Properties of Human Tissues and Its Impact on PDT. Journal of Biophotonics, 4, 773-787. https://doi.org/10.1002/jbio.201100062
[25]
Kothan, (2011) An Estimation of X-Radiation Output Using Mathematic Model. American Journal of Applied Sciences, 8, 923-926. https://doi.org/10.3844/ajassp.2011.923.926
[26]
Simo, C.R.T., Samba, O.N., Talla, P.K. and Fai, L.C. (2021) Radiation Dose from Three-Phase X-Ray Machines: A Comparison between Different Models. International Journal of Radiation Research, 19, 559-567. https://doi.org/10.52547/ijrr.19.3.559
[27]
Lee, W., Lee, S., Chong, S., Lee, K., Lee, J., Choi, J.C., et al. (2020) Radiation Dose Reduction and Improvement of Image Quality in Digital Chest Radiography by New Spatial Noise Reduction Algorithm. PLOS ONE, 15, e0228609. https://doi.org/10.1371/journal.pone.0228609
[28]
Ou, X., Chen, X., Xu, X., Xie, L., Chen, X., Hong, Z., et al. (2021) Recent Development in X-Ray Imaging Technology: Future and Challenges. Research, 2021, Article 9892152. https://doi.org/10.34133/2021/9892152
[29]
Singh, N. (2023) What Are the Emerging Trends and Future Developments in X-Ray Technology, and How Will They Impact Medical Diagnostics and Treatment? Website Article.
[30]
Ngounou, G.M., Gonin, M., Gachet, N. and Crettenand, N. (2015) Holistic Approach to Sufficient, Reliable, and Efficient Electricity Supply in Hospitals of Developing Countries: Cameroon Case Study. In: Sustainable Access to Energy in the Global South, Springer, 59-77. https://doi.org/10.1007/978-3-319-20209-9_6
[31]
Zhang, S.J., Zhao, X.Y., Zeng, X.P., Peng, C.L., Guo, X.M. and Shi, L. (2011) The Power-Supply of X-Ray Machine Adopting PID Control and High-Frequency Inverter Technology.
[32]
Ofori, E.K., Ofori-Manteaw, B.B., Gawugah, J.N.K. and Nathan, J.A. (2016) Relationship between Patient Anatomical Thickness and Radiographic Exposure Factors for Selected Radiologic Examinations. Journal of Health, Medicine and Nursing, 23, 150-162. https://iiste.org/Journals/index.php/JHMN/article/view/29048
[33]
Patel, J.R. (1992) Kilovoltage Peak and Half Value Layer Relationships of a Dental X-Ray Machine. Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research, 3, 31-35.
[34]
Procter, N.M. (1973) A Method of Checking Filtration and Kilovoltage on Diagnostic X-Ray Tubes. The British Journal of Radiology, 46, 525-528. https://doi.org/10.1259/0007-1285-46-547-525
[35]
Sekimoto, M. and Katoh, Y. (2016) Derivation of Total Filtration Thickness for Diagnostic X-Ray Source Assembly. Physics in Medicine and Biology, 61, 6011-6024. https://doi.org/10.1088/0031-9155/61/16/6011
