Ces radiol. 2013, 67(1):81-86

Radiation dose reduction to the eye lens in cerebral MDCT using iterative reconstruction algorithm IRIS - first resultsOriginal article

Jiří Jandura, Jan Žižka, Tomáš Kvasnička, Jan Grepl, Ludovít Klzo
Radiologická klinika FN a LF UK, Hradec Králové

Aim: To compare effective and organ radiation dose to the eye lens in multidetector CT (MDCT) examinations of the brain, utilising either iterative reconstruction in image space (IRIS) or filtered back projection (FBP) algorithm.

Method: Of 80 non-acute brain MDCT examinations, 40 were performed with IRIS reconstruction algorithm and other 40 with FBP algorithm. All examinations were performed on MDCT system SOMATOM Definition AS+ (Siemens Healthcare, Forchheim, Germany).
Calculation of the effective dose was done by ImPACT software (Impact, London) using CT dose index (CTDIvol) and dose length product (DLP) values. Organ dose to the eye lens was calculated from mAs value applied to the slices containing the lens. Diagnostic image quality of reconstructed data was evaluated by two experienced radiologists in a blinded fashion.

Results: For IRIS, the average effective dose to the eye lens was 1.04 ± 0.21 mSv and for FBP 1.53 ± 0.29 mSv, with a reduction of approximately of 32%. The average organ dose for IRIS was 26.9 ± 1.9 mGy and 40.2 ± 3.2 mGy for FBP, with a dose reduction of 33.1%. A comparison of image quality showed no statistically significant difference (p = 0.21). Quantitative analysis of image noise revealed slightly increased noise levels in the IRIS group, the difference was statistically significant (p < 0.01).

Conclusion: IRIS reconstruction algorithm in cerebral MDCT examinations can reduce the effective and eye lens organ dose approximately by one third, without significant deterioration of image quality compared to FBP reconstruction algorithm FBP.

Keywords: multidetector computed tomography, image processing, eye lens, cataract

Accepted: November 17, 2012; Published: March 1, 2013  Show citation

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Jandura J, Žižka J, Kvasnička T, Grepl J, Klzo L. Radiation dose reduction to the eye lens in cerebral MDCT using iterative reconstruction algorithm IRIS - first results. Ces radiol. 2013;67(1):81-86.
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