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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:24 |
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Conference: Bucharest University Faculty of Physics 2023 Meeting
Section: Biophysics; Medical Physics
Title:
The X-ray and light beam alignment in diagnostic radiology
Authors:
Radu BĂZĂVAN(1,2)
Affiliation:
1)University of Bucharest, Faculty of Physics, Atomistilor Street 405, 077125 Măgurele, Ilfov, Romania
2)MED-INNO™, Med-Inno Time Ltd, Ramnicu Valcea, Romania
E-mail
radu-george.bazavan@s.unibuc.ro
Keywords:
X-ray and light beam alignment, Light beam and bucky centering, Image fields on X-ray exposure
Abstract:
The alignment of X-ray, light and detector fields is a crucial acceptability criterion for a radiological system to perform exposure with all correct geometrical projections, thus ensuring an adequately limited and predictable irradiation dose for the patient. However, collimation, according to the investigated tissue performed by the medical staff over misaligned fields, can cause overexposure of the patient due to the larger radiation area than the visible area that was taken into account. Furthermore, as a result of this exposure, a clinically relevant image is not obtained, and the radiological investigation procedure needs to be repeated, which attracts another dose of radiation to be sent to the patient. Therefore, for the radiological equipment, a seemingly simple but, in practice, comprehensive check can significantly reduce the delivered dose, including the unwanted effects of ionizing radiation on human tissue.
This paper exhibits and explains the delicate aspects that can negatively affect the work process associated with handling activity and applying the acceptability criteria for using radiological systems in the diagnostic radiology department. There is also mentioned one of the primary causative sources that can lead to this field alignment errors and the overexposure consequence to avoid its occurrence.
The last part of this work gives a step-by-step example as guidance to check the alignment and centring of the radiological image fields along with the acceptable obtained values.
References:
[1] Radu Băzăvan, MED-INNO, Operational procedure PO 1-01-04 for carrying out manipulation activities, Revision 4, January 2023
[2] RP 162 (2012), Criteria for Acceptability of Medical Radiological Equipment used in Diagnostic Radiology, Radiation Protection no. 162, ISBN 978-92-79-27747-4, Luxembourg: Publications Office of the European Union, 2012
[3] IPEM (2005a) Institute of Physicists and Engineers in Medicine. Recommended Standards for the Routine Performance Testing of Diagnostic X-Ray Imaging Systems, Report 91 / 2005
[4] IPEM (2005b) Institute of Physicists and Engineers in Medicine. Commissioning and Routing Testing Of Mammographic X-Ray Systems, Report 89 / 2005
[5] EC (1997) - European Commission, Radiation Protection 91: Criteria of acceptability of Radiological, Luxembourg: Office for Official Publications of the European Communities, 1997
[6] EC (1998) - European Commission, European Guidelines on quality criteria for computed tomography. Luxembourg: Office for Official Publications of the European Communities, 1998
[7] EC (2006) European Commission, European guidelines for quality assurance in mammography screening and diagnosis. 4th Edn. Luxembourg: Office for Official Publications of the European Communities, 2006
[8] IAEA, Quality Assurance Programme for Computed Tomography: Diagnostic and Therapy Applications. Vienna, IAEA (in press), 2011
[9] IEC 2004a, International Electrotechnical Commission. IEC 61223-3-5 Ed 1.0: Evaluation and Routine Testing in Medical Imaging Departments - Part 3-5: Acceptance Tests – Imaging Performance of Computed Tomography X-ray Equipment.
Geneva, 2004
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