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Improving image quality in portal venography with spectral CT imaging.

Abstract：

OBJECTIVE:To investigate the effect of energy spectral CT on the image quality of CT portal venography in cirrhosis patients. MATERIALS AND METHODS:30 portal hypertension patients underwent spectral CT examination using a single-tube, fast dual tube voltage switching technique. 101 sets of monochromatic images were generated from 40keV to 140keV. Image noise and contrast-to-noise ratio (CNR) for portal veins from the monochromatic images were measured. An optimal monochromatic image set was selected for obtaining the best CNR for portal veins. The image noise and CNR of the intra-hepatic portal vein and extra-hepatic main stem at the selected monochromatic level were compared with those from the conventional polychromatic images. Image quality was also assessed and compared. RESULTS:The monochromatic images at 51keV were found to provide the best CNR for both the intra-hepatic and extra-hepatic portal veins. At this energy level, the monochromatic images had about 100% higher CNR than the polychromatic images with a moderate 30% noise increase. The qualitative image quality assessment was also statistically higher with monochromatic images at 51keV. CONCLUSION:Monochromatic images at 51keV for CT portal venography could improve CNR for displaying hepatic portal veins and improve the overall image quality.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Zhao LQ,He W,Li JY,Chen JH,Wang KY,Tan L

doi

10.1016/j.ejrad.2011.02.063

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

1677-81

issue

8

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(11)00255-5

journal_volume

81

pub_type

杂志文章

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