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Evaluating Renal Artery Stent and Stenosis using VesselIQ Xpress
CT Clinical Case Study
CT Angiography
Dr Heautot, Dr Larralde, Dr Eid, and Dr Boulmier
Centre Hospitalier Universitaire Pontchaillou
Rennes, France
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60 year old Female
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Diabetes Mellitus and hypertension
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Angioplasty performed in September, 2005 (stent in renal
artery and kissing balloon in a proximal branch)
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CT Angio at 6 months showed intimal hyperplasia in the
stent and restenosis of the branch
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A second angioplasty was performed - including
re-dilation of the stent and stenting of the branch
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Scanner type: LightSpeed VCT
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GE advanced applications:
VesselIQ Xpress
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Scan type: Helical; CTA Abdomen
(Renal Arteries)
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Scan acquisition:
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kVp = 120
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mA = 370 - 400
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Rotation speed: 0.6 second
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mAs: 222 - 240
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Slice thickness: 0.625mm
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Collimation: 40mm (64 x 0.625 mm)
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Pitch: 0.984:1
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SFOV: 50cm
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Total scan time: 2.9 sec
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Scan length: 190mm in 2.9 sec
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Contrast injection parameters:
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Contrast injection rate: 4 ml/sec iodine
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Total contrast volume: 70 ml iodine
+ 40 ml saline flush
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CTA control at 3 months again shows,
hyperplasia in both stents.
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AutoBone extraction depicts, easily, renal arteries from ostia to distal location
in 3D MIP
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Technical parameters are set up to cover anatomy in <3 seconds, allowing
acquisition complete within arterial phase
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Accuracy of the CT Angiography allows detection of silent re-stenosis
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