Magnetic Resonance Angiography (MRA) of the peripheral arteries has become essential in the diagnosis and follow-up of peripheral arterial disease. In clinical routine, the acquisition uses intravenous injection of a Gadolinium based contrast agent (gadolinium chelates). Initially, contrast enhanced MR angiography (CE-MRA) was recommended for diabetic patients, elderly patients and\\or patients with chronic renal insufficiency presenting a contraindication to CT angiography using iodized contrast agent injection. However, the increase in nephrogenic systematic fibrosis clinical cases, which would be secondary to gadolinium chelates injection, in patients with chronic renal insufficiency has restricted the use of CE-MRA. More than 500 cases were described to date in the world. Its occurrence is currently estimated around 4 % for patients in terminal chronic renal insufficiency and its mortality around 30 %. According to the recommendations of AFSSAPS from August, 2007, two gadolinium contrast agents (Gadodiamide-OMNISCAN \*, General Electric HealthCare and Gadopentetate Dimeglumine-MAGNEVIST \*, Bayer HealthCare) are contraindicated if the glomerular filtration rate is lower than 30 ml/mn. Non-contrast enhanced MR angiography (NCE MRA) techniques have been proposed to provide complete and non-invasive investigation of the peripheral vasculature, from the abdominal aorta to the calf, thus offering patients with chronic renal insufficiency a surrogate with no side effects. Moreover, the use of high field (3T) MR imaging and phased array coils offers high quality images and good signal to noise ratio for peripheral vasculature analysis. Besides, the acquisition can be repeated if required as it does not require any contrast injection. The main objective is to evaluate the quality of the NCE images obtained for every investigated station from the abdominal aorta to the calf. The secondary objective is to compare the diagnostic performances of NCE images with those of CE MRA. The third objective is to estimate the contribution of automated and dedicated post-processing tools in optimizing the diagnostic quality of the images.
20 patients will be recruited either by the vascular surgery or by the cardiology departments The appointment for MRA of the peripheral arteries on the Siemens 3T MR Scanner will be given as usual.
Study Type
OBSERVATIONAL
Enrollment
22
Each patient will receive on the same day: * NCE MRA * CE MRA usually performed in the clinical routine After each MRA examination, the CE images will be interpreted by a radiologist and the report transmitted to the prescriber within the usual delay. The radiologists in charge of this interpretation will not be involved in the evaluation of NCE images nor in the comparison between CE and NCE images.
Rennes University Hospital
Rennes, France, France
To evaluate the quality of the NCE images obtained for every investigated station from the abdominal aorta to the calf.
To evaluate the quality of the NCE images obtained for every investigated station from the abdominal aorta to the calf.
Time frame: 5 months
To compare the diagnostic performances of NCE images with those of CE MRA.
To compare the diagnostic performances of NCE images with those of CE MRA.
Time frame: 5 months
To estimate the contribution of automated and dedicated post-processing tools in optimizing the diagnostic quality of the images.
To estimate the contribution of automated and dedicated post-processing tools in optimizing the diagnostic quality of the images.
Time frame: 5 months
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