Hungarian Radiology

[Initial experiences with TOF MR and contrastenhanced MR angiography of the supraaortic arteries]


DECEMBER 20, 2006

Hungarian Radiology - 2006;80(07-08)

[INTRODUCTION - 95 MR angiographic examinations of the supraortic arteries were performed at the Rethy Pal Hospital, Bekescsaba between February 2003 and May 2005. The aim of this publication is to analyse the clinical benefit of contrast-enhanced MR angiography compared to duplex ultrasound and to evaluate the role of TOF MR angiography in the diagnostics of the carotid arteries. We compared the results of contrast-enhanced MR angiography, TOF MR angiography and duplex ultrasound. MATERIAL AND METHOD - 95 patients were examined by CE MR angiography following carotid duplex US in 59 cases and TOF MR angiography in 88 cases. Duplex US was done using LOGIQ 400 PRO system, MR angiography were performed by 1.5 T Siemens Magnetom Symphony unit. RESULTS - Stenosis of the internal carotid artery was confirmed in 67 cases and stenosis of the common carotid artery was seen in 10 cases. Bilateral ICA stenoses were detected in 17 patients and bilateral CCA stenoses could be revealed in 3 cases. The ICA stenosis was mild in 22 (33%), moderate in 18 (27%), and serious in 27 cases (40%). Occlusion was seen in 10 cases (15%). CE MR angiography showed stenosis at the origin of the CCA in 5 patients, at the origin of the vertebral and the subclavian artery in 10-10 cases that could not be detected by duplex ultrasound. Subclavian artery stenosis was seen in 15 patients, 7 of them presented subclavian steal syndrome. 13 patients had vertebral artery stenosis, 7 of them bilateral. 13 of the 20 VA stenoses were mild, 4 were found to be moderate and 3 were serious. In four patients the vertebral arteries were occluded. In six questionable cases MR angiography solved the problem. Reversed flow could be detected in 5 cases with duplex ultrasound suggestive of subclavian steal syndrome, which was later confirmed by TOF and CE MR angiography. TOF MR angiography showed stenosis on reconstructed images, which was not confirmed by neither duplex US or CE MR angiography. Paraganglioma was detected in one patient. CONCLUSION - In case of calcified plaques and abnormal arterial-course CE MR angiography contributes significantly to the detection of the stenosis. In cases with moderate and serious stenosis duplex ultrasound and MR angiography provided similar results. In case of occlusions the results of the two modalities were the same. The contrast-enhanced MR angiography gives the possibility to show the aortic origin of the supraaortic arteries in contrast to the duplex US and TOF MR angiography. To establish the diagnosis of subclavian steal syndrome the directional sensitivity of TOF MR angiography and duplex US is helpful adjunct to CE MR angiography.]



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