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Panoral dose assessment: a comparative report of methodologies
J Shafford1, M Pryor2, P Hollaway2
1Regional Radiation Protection Service (RRPS), Royal Surrey County Hospital NHS Foundation Trust, St Lukes Wing, Level B, Egerton Road, Guildford, Surrey GU2 7XX, UK jshafford@hotmail.com.
Radiation Protection Dosimetry
|April 8, 2014
Summary
Patient dose for panoral X-ray units is now measured using dose area product (DAP). Investigations reveal up to 30% variation in DAP measurements between methods, highlighting the need for standardized reporting.
Area of Science:
- Medical Physics
- Diagnostic Imaging
- Radiation Dosimetry
Background:
- Current national guidance (IPEM Report 91) mandates dose area product (DAP) for panoral X-ray patient dosimetry.
- This replaces previous recommendations for dose width product measurements.
- Variability in measurement techniques necessitates an evaluation of accuracy and consistency.
Purpose of the Study:
- To investigate available methods for measuring patient dose area product (DAP) in panoral X-ray units.
- To analyze potential errors associated with different DAP measurement methodologies.
- To provide recommendations for accurate and reliable DAP determination in clinical practice.
Main Methods:
- Comparative analysis of various techniques for DAP measurement in panoral radiography.
- Utilized solid-state dosimetry and film/ruler measurements to calculate DAP.
- Quantified measurement variations across different methodologies.
Main Results:
- Significant variations, up to 30%, were observed in DAP measurements depending on the method employed.
- Direct measurement using a DAP meter is recommended for optimal accuracy.
- A conversion factor of 1.4 was established for calculating DAP from solid-state dose and film/ruler measurements.
Conclusions:
- Methodological differences can lead to substantial discrepancies in reported DAP values for panoral X-ray units.
- Direct DAP measurement with a dedicated meter is the preferred approach.
- Transparency in reporting is crucial; the methodology used for DAP determination must always be specified.
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