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British Journal of Radiology (2003) 76, 824-831
© 2003 British Institute of Radiology
doi: 10.1259/bjr/25639755
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A comparison of polyacrylamide gels and radiochromic film for source measurements in intravascular brachytherapy

M N Amin, MSc, MPhil 1 M A Horsfield, BSc, PhD 1 D E Bonnett, MSc, PhD 2 M J Dunn, MSc 3 M Poulton, MSc 3 and P F Harding, ONC 3

1 Division of Medical Physics, University of Leicester, Leicester LE1 5WW 2 Department of Medical Physics, Kent Oncology Centre, Maidstone and Tunbridge Wells NHS Trust, Kent ME16 9QQ and 3 Department of Medical Physics, University Hospitals of Leicester, Leicester LE1 5WW, UK



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  		Figure 1. Polyacrylamide gel (PAG) phantom with a glass (left) and a BarexTM (right) insert after an irradiation of 8 Gy with 90Sr/90Y sources.

 


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  		Figure 2. Coronal image of polyacrylamide gel (PAG) used as a vascular brachytherapy phantom and irradiated using 90Sr/90Y sources with an in-plane resolution of 0.2 mm.

 


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  		Figure 3. Sagittal images of polyacrylamide gel used as a vascular brachytherapy phantom and irradiated using 90Sr/90Y sources. (a) Straight insert with 0.2 mm in-plane resolution; (b) curved insert with 0.4 mm in-plane resolution.

 


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  		Figure 4. Calibration curve for a polyacrylamide gel measured using the 4.7 T MRI scanner. The error bars represent the standard error in the mean of several measurements made at different positions inside the calibration tubes, and the errors are a result of not only random noise but also image artefacts, the magnitude of which depended on the position of the calibration tube inside the receiver coil.

 


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  		Figure 5. Calibration curves for radiochromic film irradiated with a range of energies and sources.

 


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  		Figure 6. Calibration curves for radiochromic MD-55 film and radiochromic HD-810 film irradiated using 6 MV X-ray. Error bars are too small to be shown on this figure.

 


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  		Figure 7. Relative absorbed dose measured orthogonally to the centre of the source train using polyacrylamide gel (PAG) and radiochromic film. Results are normalized to 2 mm from the centre of the source train. The error bars for the gel data were omitted for the sake of clarity. Errors for the PAG data were estimated to be ±5.6% (1 standard deviation) based on the variation in dose in the low dose region.

 


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  		Figure 8. A comparison of profiles measured using polyacrylamide gel and radiochromic film parallel to the catheter axis at a radial distance of 2 mm from the source centre.

 


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  		Figure 9. Measured profiles using polyacrylamide gel (PAG) and imaged with in-plane resolutions of 0.4 mm compared with PAG with a glass insert imaged with 0.2 mm in-plane resolution.

 


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  		Figure 10. Radial plot of R2 measured at 2 mm radial distance from the source centre at 15° intervals.

 




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