Diagnostic Reference Level Arising from Dental Panoramic Radiography

Document Type: Original Paper

Authors

Medical Physics Department, Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

Abstract

Introduction
The present work describes a study in which, based on patient dose measurements, thermoluminescent dosimeters were used to obtain the diagnostic reference level arising from panoramic radiography.
Materials and Methods
Ten panoramic units and a sample of 15 patients per X-ray unit were studied. Two thermoluminescent dosimeter chips were placed on the skin surface of selected organs. Mean value of two ESDs was taken as the measured representation dose at the point of interest. 
Results
Mean ESD on parotid glands derived from panoramic radiography was equal to 369.2 µGy. Individual patients' dose value varied from 180.1 to 470.3 µGy.
Conclusion
Third quartile of mean absorbed dose distribution arising from a particular examination has been adopted as diagnostic reference level. Based on this definition, local diagnostic reference level arising from panoramic radiography of the greater Khorasan province is equal to 400 µG.

Keywords

Main Subjects


  1. Radiologists RCo, Board NRP. Patient Dose Reduction in Diagnostic Radiology: Report by the Royal College of Radiologists and the National Radiological Protection Board: NRPB; 1990.
  2. Wall BF. Diagnostic reference levels--the way forward. Br J Radiol. 2001 Sep;74(885):785-8.
  3. Poppe B, Looe HK, Pfaffenberger A, Chofor N, Eenboom F, Sering M, et al. Dose-area product measurements in panoramic dental radiology. Radiat Prot Dosimetry. 2007;123(1):131-4.
  4. ICRP, 1996. Radiological Protection and Safety in Medicine. ICRP Publication 73. Ann. ICRP: 1996;26 (2).
  5. UNSCEAR S. Effects of Ionizing Radiation. United Nations, New York. 2000.
  6. Doyle P, Martin CJ, Robertson J. Techniques for measurement of dose width product in panoramic dental radiography. Br J Radiol. 2006 Feb;79(938):142-7.
  7. Goldstein A. Exposure and dose in panoramic radiology. Med Phys. 1998 Jun;25(6):1033-40.
  8. Wall BF, Fisher ES, Paynter R, Hudson A, Bird PD. Doses to patients from pantomographic and conventional dental radiography. Br J Radiol. 1979 Sep;52(621):727-34.
  9. Tyndall DA, Washburn DB. The effect of rare earth filtration on patient exposure, dose reduction, and image quality in oral panoramic radiology. Health Phys. 1987 Jan;52(1):17-26.
  10. Underhill TE, Chilvarquer I, Kimura K, Langlais RP, McDavid WD, Preece JW, et al. Radiobiologic risk estimation from dental radiology. Part I. Absorbed doses to critical organs. Oral Surg Oral Med Oral Pathol. 1988 Jul;66(1):111-20.
  11. Freeman JP, Brand JW. Radiation doses of commonly used dental radiographic surveys. Oral Surg Oral Med Oral Pathol. 1994 Mar;77(3):285-9.
  12. Bartolotta A, Calenda E, Calicchia A, Indovina PL. Dental orthopantomography: survey of patient dose. Radiology. 1983 Mar;146(3):821-3.
  13. Gonzalez L, Vano E, Fernandez R. Reference doses in dental radiodiagnostic facilities. Br J Radiol. 2001 Feb;74(878):153-6.
  14. Napier ID. Reference doses for dental radiography. Br Dent J. 1999 Apr 24;186(8):392-6.
  15. Isoardi P, Ropolo R. Measurement of dose-width product in panoramic dental radiology. Br J Radiol. 2003 Feb;76(902):129-31.
  16. Kim YH, Lee JS, Yoon SJ, Kang BC. Reference dose levels for dental panoramic radiography in Anyang City. Korean Journal of Oral and Maxillofacial Radiology. 2009;39(4):199-203.
  17. Lee JS, Kim YH, Yoon SJ, Kang BC. Reference dose levels for dental panoramic radiography in Gwangju, South Korea. Radiat Prot Dosimetry. 2010 Dec;142(2-4):184-90.
  18. Asadinezhad M, Bahreyni Toossi MT. Doses to patients in some routine diagnostic X-ray examinations in Iran: proposed the first Iranian diagnostic reference levels. Radiat Prot Dosimetry. 2008;132(4):409-14.
  19. Hintze J. Power Analysis and Sample Size (PASS 2002) Software. Journal of Occupational Psychology, Employment and Disability. 2004; 6 (1):29-30.
  20. COR NI. National protocol for patient dose measurements in diagnostic radiology. Chilton, UK: NRPB. 1992.
  21. Looe HK, Eenboom F, Chofor N, Pfaffenberger A, Steinhoff M, Ruhmann A, et al. Conversion coefficients for the estimation of effective doses in intraoral and panoramic dental radiology from dose-area product values. Radiat Prot Dosimetry. 2008;131(3):365-73.
  22. No ISS. 115, International Basic Safety Standards for Protection against Ionizing Radiation and for the Safety of Radiation Sources. International Atomic Energy Agency, Vienna. 1996.
  23. Kaeppler G, Buchgeister M, Reinert S. Influence of the rotation centre in panoramic radiography. Radiat Prot Dosimetry. 2008;128(2):239-44.
  24. ICRP, 2004. Managing Patient Dose in Digital Radiology. ICRP Publication 93. Ann. ICRP 34 (1).
  25. Danforth RA, Clark DE. Effective dose from radiation absorbed during a panoramic examination with a new generation machine. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2000 Feb;89(2):236-43.
  26. Tierris CE, Yakoumakis EN, Bramis GN, Georgiou E. Dose area product reference levels in dental panoramic radiology. Radiat Prot Dosimetry. 2004;111(3):283-7.

Volume 9, Issue 3
September and October 2012
Pages 161-167
  • Receive Date: 06 August 2012
  • Revise Date: 23 January 2013
  • Accept Date: 13 October 2012