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J Comput Assist Tomogr. 2013 Jul-Aug;37(4):551-9. doi: 10.1097/RCT.0b013e31828f871f.

Individualized kV selection and tube current reduction in excretory phase computed tomography urography: potential for radiation dose reduction and the contribution of iterative reconstruction to image quality.

Author information

1
Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA. froemming.adam@mayo.edu

Abstract

OBJECTIVE:

The objective of this study was to analyze radiation dose reduction and image quality by combining automated kV selection, tube current reduction, and iterative reconstruction.

METHODS:

This was a retrospective analysis of the excretory phase of 55 patients with 2 computed tomography urography examinations: automated kV selection with tube current reduction ("low-dose protocol": with filtered back projection vs iterative reconstruction) and routine dose examinations. Image quality was analyzed blindly and in side-by-side analyses, in addition to quantitative measurements.

RESULTS:

Low-dose protocol median dose change was -40% (-10.7 to +12.9 mGy); 100 kV was autoselected in 44 (80%) of 55 patients (body mass index range, 19-36 kg/m) with mean dose reduction of 42.5%. Whereas up to 19% of low-dose images with filtered back projection were inferior by blinded review (P < 0.001), low-dose iterative reconstruction images were not rated inferior (P = 1.0).

CONCLUSIONS:

The combination of iterative reconstruction, automated kV selection, and tube current reduction results in radiation dose reduction with preserved image quality and diagnostic confidence.

PMID:
23863531
DOI:
10.1097/RCT.0b013e31828f871f
[Indexed for MEDLINE]

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