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Eur Radiol. 2013 Oct;23(10):2643-51. doi: 10.1007/s00330-013-2887-x. Epub 2013 Jul 5.

Clinical evaluation of automatic tube voltage selection in chest CT angiography.

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1
Department of Thoracic Imaging, Hospital Calmette (EA 2694), University Lille Nord de France, 59000, Lille, France.

Abstract

OBJECTIVE:

To evaluate the clinical impact of automatic tube voltage selection on chest CT angiography (CTA).

METHODS:

Ninety-three patients were prospectively evaluated with a CT protocol aimed at comparing two successive CTAs acquired under similar technical conditions except for the kV selection: (1) the initial CTA was systematically obtained at 120 kVp and 90 ref mAs; (2) the follow-up CTA was obtained with an automatic selection of the kilovoltage (Care KV; Siemens Healthcare) for optimised CTA.

RESULTS:

At follow-up, 90 patients (97 %) underwent CTA with reduced tube voltage, 100 kV (n = 26; 28 %) and 80 kV (n = 64; 69 %), resulting in a significant dose-length-product reduction (follow-up: 87.27; initial: 141.88 mGy.cm; P < 0.0001; mean dose reduction: 38.5 %) and a significant increase in the CNR at follow-up (follow-up: 11.5 ± 3.5 HU; initial: 10.9 ± 3.7 HU; P = 0.03). The increase in objective image noise at follow-up (follow-up: 23.2 ± 6.7 HU vs. 17.8 ± 5.1 HU; P < 0.0001) did not alter the diagnostic value of images.

CONCLUSION:

Automatic tube voltage selection reduced the radiation dose delivered during chest CT angiograms by 38.5 % while improving the contrast-to-noise ratio of the examinations.

KEY POINTS:

• As low a dose as possible must be used for CT angiography. • Automatic tube voltage selection permits reduced patient exposure. • Lowering the kVp enables increased intravascular attenuation. • Automatic tube voltage selection does not compromise the overall image quality.

PMID:
23828227
DOI:
10.1007/s00330-013-2887-x
[Indexed for MEDLINE]
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