OBJECTIVE: The purpose of this study was to compare CT angiography (CTA) and MR angiography (MRA) for the detectability of 75% and 95% stenoses in phantoms using six different stents. MATERIALS AND METHODS: Six different stents (Expander, Hemobahn, SelfX, Smart, Symphony, and Wallstent) were inserted into tubes filled with contrast agent (ioversol or gadoteric acid). To mimic stenoses of 75% and 95% of the patent lumen, 8-mm-diameter nylon cylinders were bored in the central axis (2 mm and 4 mm, respectively) and placed into the stent lumen. Intensity profiles across stenoses on 2-mm coronal reformatted sections of CTA or MRA were compared, and the detectability of the residual lumen was assessed using a subjective score. RESULTS: CTA showed relative in-stent signal attenuation for the in-stent stenoses of the tested stents ranging from 75% to 100% of the signal intensity of the control. SelfX and Symphony showed further shading of the residual lumen due to beam-hardening artifacts. Overestimation of stenosis was associated with low-grade stenoses in which the border of the lumen was closer to the stent struts. MRA showed relative in-stent signal attenuation of the in-stent stenoses ranging from 30% to 100% of the signal intensity of the control. Strut thickness tended to correlate with higher attenuation at CT. CONCLUSION: CTA may be more suitable for differentiation between 95% stenosis and occlusion; MRA has higher sensitivity in detecting 75% stenoses. Strut thickness and mesh size did not prove to be significant predictors for signal attenuation or overall image quality.
OBJECTIVE: The purpose of this study was to compare CT angiography (CTA) and MR angiography (MRA) for the detectability of 75% and 95% stenoses in phantoms using six different stents. MATERIALS AND METHODS: Six different stents (Expander, Hemobahn, SelfX, Smart, Symphony, and Wallstent) were inserted into tubes filled with contrast agent (ioversol or gadoteric acid). To mimic stenoses of 75% and 95% of the patent lumen, 8-mm-diameter nylon cylinders were bored in the central axis (2 mm and 4 mm, respectively) and placed into the stent lumen. Intensity profiles across stenoses on 2-mm coronal reformatted sections of CTA or MRA were compared, and the detectability of the residual lumen was assessed using a subjective score. RESULTS: CTA showed relative in-stent signal attenuation for the in-stent stenoses of the tested stents ranging from 75% to 100% of the signal intensity of the control. SelfX and Symphony showed further shading of the residual lumen due to beam-hardening artifacts. Overestimation of stenosis was associated with low-grade stenoses in which the border of the lumen was closer to the stent struts. MRA showed relative in-stent signal attenuation of the in-stent stenoses ranging from 30% to 100% of the signal intensity of the control. Strut thickness tended to correlate with higher attenuation at CT. CONCLUSION: CTA may be more suitable for differentiation between 95% stenosis and occlusion; MRA has higher sensitivity in detecting 75% stenoses. Strut thickness and mesh size did not prove to be significant predictors for signal attenuation or overall image quality.
Authors: Andreas M J Frölich; Sara M Pilgram-Pastor; Marios N Psychogios; Alexander Mohr; Michael Knauth Journal: Neuroradiology Date: 2010-08-19 Impact factor: 2.804
Authors: Christina M Plank; Florian Wolf; Herbert Langenberger; Michael Weber; Dietrich Beitzke; Alfred Stadler; Martin Schillinger; Johannes Lammer; Christian Loewe Journal: Eur Radiol Date: 2011-05-10 Impact factor: 5.315
Authors: R Syha; D Ketelsen; M Kaempf; S Mangold; S Sixt; T Zeller; F Springer; F Schick; C D Claussen; K Brechtel Journal: Eur Radiol Date: 2012-08-17 Impact factor: 5.315
Authors: D Atasoy; N Kandasamy; J Hart; J Lynch; S-H Yang; D Walsh; C Tolias; T C Booth Journal: AJNR Am J Neuroradiol Date: 2019-11-14 Impact factor: 3.825
Authors: K Perisinakis; E Manousaki; K Zourari; D Tsetis; A Tzedakis; A Papadakis; A Karantanas; J Damilakis Journal: Br J Radiol Date: 2011-03 Impact factor: 3.039
Authors: Jin Woo Choi; Hong Gee Roh; Won-Jin Moon; Na Ra Kim; Sung Gyu Moon; Chung Hwan Kang; Young Il Chun; Hyun-Seung Kang Journal: Korean J Radiol Date: 2011-09-27 Impact factor: 3.500