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British Journal of Radiology (2006) 79, 142-147
© 2006 British Institute of Radiology
doi: 10.1259/bjr/33207232
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Techniques for measurement of dose width product in panoramic dental radiography

P Doyle, MSc, C J Martin, PhD and J Robertson, PhD

Health Physics, Department of Clinical Physics and Bio-Engineering, Gartnavel Royal Hospital, Glasgow G12 OXH, UK


Figure 1
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  		Figure 1. Dose profiles from orthopantomographic(OPT) unit with beam widths of 2.5 mm and 4 mm, measured using thermoluminescent dosemeters (TLDs), compared with the measured sensitivity profile across the width of the Unfors detector.

 

Figure 2
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  		Figure 2. Plot of dose width products(DWPs) derived from thermoluminescent dosemeters (TLDs) showing the DWP derived from the product of the peak dose and full width half maximum (FWHM) against the DWP from the summation of the doses for all the TLDs across the beam. The line of identity is a 45° trendline.

 

Figure 3
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  		Figure 3. Plot of dose width product(DWP) measurements using an Unfors detector (techniques A1 – with full width half maximum (FWHM) derived from thermoluminescent dosemeter (TLD) profile and A2 – FWHM measured with a ruler and film) and a pencil ionization chamber (technique B), against the DWP derived from summation of doses across the beam from TLDs (technique C1). The line of identity is a 45° trendline.

 

Figure 4
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  		Figure 4. Bar chart showing dose–area product (DAP) values for a standard adult exposure for the 20 units studied. Data from film/screen combinations with indices of 200–250 (F250, dark) and 400 (F400, light), and from computed radiography (horizontal lines) and digital radiography (angled lines) systems are indicated by different shading.

 




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