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PT  - JOURNAL ARTICLE
AU  - Hähnel, Stefan
AU  - Trossbach, Manuel
AU  - Braun, Cora
AU  - Heiland, Sabine
AU  - Knauth, Michael
AU  - Sartor, Klaus
AU  - Hartmann, Marius
TI  - Small-Vessel Stents for Intracranial Angioplasty: In Vitro Comparison of Different Stent Designs and Sizes by Using CT Angiography
DP  - 2003 Sep 01
TA  - American Journal of Neuroradiology
PG  - 1512--1516
VI  - 24
IP  - 8
4099  - http://www.ajnr.org/content/24/8/1512.short
4100  - http://www.ajnr.org/content/24/8/1512.full
SO  - Am. J. Neuroradiol.2003 Sep 01; 24
AB  - BACKGROUND AND PURPOSE: Our purpose was to evaluate whether CT angiography is a suitable alternative to conventional angiography in the evaluation of small-vessel stents for intracranial angioplasty.METHODS: CT angiographic appearances of 23 stents of different designs and sizes (2.0, 3.0, and 4.0 mm) were investigated after they were filled with a solution of 0.9% NaCl or diluted contrast medium. For each stent, artificial lumen narrowing (ALN) was measured, and the difference in the number of pixels with a Hounsfield value below 200 HU between the two filling states, DIFFHU<200, was calculated to provide an objective indicator of the size of the evaluable stent diameter.RESULTS: With a window width of 1500 HU at a window level of 400 HU, ALN ranged from 66.8% to 97.7% in the group of 2.0-mm stents and from 38.6% to 66.8% in the groups of 3.0- and 4.0-mm stents. For the 2.0-mm stents, DIFFHU<200 was zero. In the groups of 3.0- and 4.0-mm stents, DIFFHU<200 ranged from 0.3 to 6.7, corresponding to a diameter of 0.13–3.0 mm, when the pixel size was presupposed to be 0.449 mm.CONCLUSION: CT angiographic evaluation of small-vessel patency after stent placement is considerably impaired by ALN. Stent manufacturers should be aware of potential artifacts caused by their stents during noninvasive diagnostic studies such as CT angiography.