Thoracic aortic stent graft: comparison of contrast-enhanced MR angiography and CT angiography in the follow-up: initial results.

Autor:	Weigel, Stefanie, Tombach, Bernd, Maintz, David, Klotz, Stefan, Vestring, Thomas, Heindel, Walter, Fischbach, Roman
Předmět:	THORACIC arteries AORTIC aneurysms ANEURYSMS THORACIC surgery SURGICAL stents MAGNETIC resonance imaging DIAGNOSTIC imaging ALLOYS ANGIOGRAPHY BLOOD vessel prosthesis CHEMICAL elements COMPARATIVE studies COMPUTED tomography LONGITUDINAL method RESEARCH methodology MEDICAL cooperation ORGANOMETALLIC compounds RESEARCH THREE-dimensional imaging EVALUATION research CONTRAST media MAGNETIC resonance angiography THORACIC aneurysms DISSECTING aneurysms THERAPEUTICS
Zdroj:	European Radiology; Jul2003, Vol. 13 Issue 7, p1628-1634, 7p
Abstrakt:	The objective of this study was to compare contrast-enhanced magnetic resonance angiography (CE MRA) and multislice computed tomographic angiography (MS CTA) in the follow-up of thoracic stent-graft placement. The CE MRA and MS CTA were performed following nitinol stent-graft treatment due to thoracic aneurysm ( n=4), intramural bleeding ( n=2) and type-B aortic dissection ( n=5). Corresponding evaluation of arterial-phase imaging characteristics focused on the stent-graft morphology and leakage assessment. Stent-graft and aneurysm extensions were comparable between both techniques. Complete exclusion (aneurysm, n=4; dissection, n=2) was assessed with high confidence with CE MRA and MS CTA. Incomplete exclusion (intramural bleeding, n=2; dissection, n=3) was assigned to lower confidence scores on CE MRA compared with MS CTA. On CE MRA the stent-graft lumen demonstrated an inhomogeneous signal, the stent struts could not be assessed. The CE MRA can be used as alternative non-invasive imaging for follow-up of nitinol stent grafts. Arterial-phase leak assessment can be less evident in CE MRA compared with MS CTA studies; therefore, the use of late-phase imaging seems to be necessary. The diagnostic gap of stent-graft fracture evaluation using MRA may be filled with plain radiographs. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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