Keywords:
Kidney, Vascular, Arteries / Aorta, CT-Angiography, MR-Angiography, Imaging sequences, Stents, Arteriosclerosis, Hypertension, Obstruction / Occlusion
Authors:
E. Esteban García1, V. Garcia Medina2, J. García Medina2, M. I. Moya García1, D. Pérez Flores2; 1Torrevieja/ES, 2murcia/ES
DOI:
10.26044/ecr2019/C-1419
Methods and materials
This is a board–approved,
double-blinded review.
Patient demographics,
CTA and MR imaging findings,
were retrospectively obtained from the electronic medical records.
MRI were carried out in a 1.5T Symphony Tim (Siemens,
Erlangen,
Germany),
using a 6-channel body coil.
The 3D TOF sequence was acquired during free-breathing,
with a total acquisition time of 6min,
and the following imaging parameters: water excitation,
excitation FA=25º,
axial-oriented slab consisting of 92 partitions of 0.9mm thickness distributed in 3 blocks,
in-plane FOV=271x406 mm2,
Matrix=179x384,
TR/TE=36/4.6 ms,
BW=70 Hz/px,
phase-encoding (PE) direction=A-P.
Two saturation bands were placed superiorly and inferiorly to the kidneys,
to suppress inferior vena cava and renal vein signals.
The CTA were performed in a 16-detector CT scanner (Brilliance 16; Philips Medical Systems) with a nonionic,
low-osmolarity iodinated contrast agent.
The start of the scanning was triggered automatically by a real-time bolus tracking technique with the ROI in the infrarenal abdominal aorta.
A slice thickness of 0,75 was used.
A total of 58 patients who underwent a CTA and a TOF-MRA of the renal arteries were reviewed and images from 120 renal arteries were independently assessed by two radiologists.
A consensus reading was used for those arteries with discrepant readings.
The degree of stenosis was classified in four groups: stenosis <30%,
stenosis between 30-60%,
stenosis >60% and occlusion.
Clinically significant stenosis was considered when greater than 60%.