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DOI: 10.1148/rg.265055127
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An Investigation of Operator Exposure in Interventional Radiology1

Beth A. Schueler, PhD, Thomas J. Vrieze, RT(R), Haraldur Bjarnason, MD and Anthony W. Stanson, MD

1 From the Department of Radiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905. Recipient of a Certificate of Merit award for an education exhibit at the 2002 RSNA Annual Meeting. Received June 7, 2005; revision requested July 26 and received October 10; accepted October 10. All authors have no financial relationships to disclose.

Figure 1
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  		Figure 1.  Photograph shows the angiographic C arm and the abdomen phantom with an additional 5-cm of bolus material and six ionization chambers positioned to acquire stray radiation measurements on a 30-cm grid.

 

Figure 2
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  		Figure 2.  Drawing illustrates the location of the FOV (gray circle), the operator’s expected position for right femoral access, and the location of measurement positions (•) at 30-cm intervals along a vertical plane angled 45° from the table.

 

Figure 3
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  		Figure 3a.  Effect of changing the FOV on operator exposure. Drawings illustrate stray radiation isodose curves for FOVs of 28 cm (a), 20 cm (b), and 14 cm (c).

 

Figure 3
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  		Figure 3b.  Effect of changing the FOV on operator exposure. Drawings illustrate stray radiation isodose curves for FOVs of 28 cm (a), 20 cm (b), and 14 cm (c).

 

Figure 3
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  		Figure 3c.  Effect of changing the FOV on operator exposure. Drawings illustrate stray radiation isodose curves for FOVs of 28 cm (a), 20 cm (b), and 14 cm (c).

 

Figure 4
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  		Figure 4a.  Effect of adding copper spectral beam filtration on operator exposure. Drawings illustrate stray radiation isodose curves for no added copper (a), 0.2 mm of added copper (b), and 0.5 mm of added copper (c).

 

Figure 4
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  		Figure 4b.  Effect of adding copper spectral beam filtration on operator exposure. Drawings illustrate stray radiation isodose curves for no added copper (a), 0.2 mm of added copper (b), and 0.5 mm of added copper (c).

 

Figure 4
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  		Figure 4c.  Effect of adding copper spectral beam filtration on operator exposure. Drawings illustrate stray radiation isodose curves for no added copper (a), 0.2 mm of added copper (b), and 0.5 mm of added copper (c).

 

Figure 5
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  		Figure 5a.  Effect of increasing patient abdomen thickness on operator exposure. Drawings illustrate stray radiation isodose curves calculated with a phantom simulating abdomen thicknesses of 24 cm (a), 29 cm (b), and 34 cm (c).

 

Figure 5
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  		Figure 5b.  Effect of increasing patient abdomen thickness on operator exposure. Drawings illustrate stray radiation isodose curves calculated with a phantom simulating abdomen thicknesses of 24 cm (a), 29 cm (b), and 34 cm (c).

 

Figure 5
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  		Figure 5c.  Effect of increasing patient abdomen thickness on operator exposure. Drawings illustrate stray radiation isodose curves calculated with a phantom simulating abdomen thicknesses of 24 cm (a), 29 cm (b), and 34 cm (c).

 

Figure 6
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  		Figure 6a.  Effect of changing patient position on operator exposure. Drawings illustrate stray radiation isodose curves calculated with the radiation field centered on the liver (a) and spleen (b).

 

Figure 6
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  		Figure 6b.  Effect of changing patient position on operator exposure. Drawings illustrate stray radiation isodose curves calculated with the radiation field centered on the liver (a) and spleen (b).

 

Figure 7
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  		Figure 7a.  Effect of an equalization filter on operator exposure. (a) Fluorographic image shows the position of an equalization filter (shaded area) covering 30% of the FOV. (b, c) Drawings illustrate stray radiation isodose curves for configurations without (b) and with (c) the equalization filter in place.

 

Figure 7
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  		Figure 7b.  Effect of an equalization filter on operator exposure. (a) Fluorographic image shows the position of an equalization filter (shaded area) covering 30% of the FOV. (b, c) Drawings illustrate stray radiation isodose curves for configurations without (b) and with (c) the equalization filter in place.

 

Figure 7
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  		Figure 7c.  Effect of an equalization filter on operator exposure. (a) Fluorographic image shows the position of an equalization filter (shaded area) covering 30% of the FOV. (b, c) Drawings illustrate stray radiation isodose curves for configurations without (b) and with (c) the equalization filter in place.

 




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