Digital radiography of scoliosis with a scanning method: radiation dose optimization |
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Authors: | Geijer Håkan Verdonck Bert Beckman Karl-Wilhelm Andersson Torbjörn Persliden Jan |
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Institution: | Department of Radiology, Orebro University Hospital, 701 85 Orebro, Sweden. hakan.geijer@orebroll.se |
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Abstract: | The aim of this study was optimization of the radiation dose–image quality relationship for a digital scanning method of
scoliosis radiography. The examination is performed as a digital multi-image translation scan that is reconstructed to a single
image in a workstation. Entrance dose was recorded with thermoluminescent dosimeters placed dorsally on an Alderson phantom.
At the same time, kerma area product (KAP) values were recorded. A Monte Carlo calculation of effective dose was also made.
Image quality was evaluated with a contrast-detail phantom and Visual Grading. The radiation dose was reduced by lowering
the image intensifier entrance dose request, adjusting pulse frequency and scan speed, and by raising tube voltage. The calculated
effective dose was reduced from 0.15 to 0.05 mSv with reduction of KAP from 1.07 to 0.25 Gy cm2 and entrance dose from 0.90 to 0.21 mGy. The image quality was reduced with the Image Quality Figure going from 52 to 62
and a corresponding reduction in image quality as assessed with Visual Grading. The optimization resulted in a dose reduction
to 31% of the original effective dose with an acceptable reduction in image quality considering the intended use of the images
for angle measurements.
Electronic Publication |
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Keywords: | Dosimetry Image quality Digital radiography Spinal curvature Spinal radiography |
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