Learning objectives
Explain the physical basis of the new sequence of nonenhanced magnetic resonance angiography (MRA): 3D Inhance Inflow IR,
its clinical application and correlation with conventional arteriography.
Background
In the early nineties nonenhanced MR angiographic sequences arise,
phenomenon based on the input ortime-of-flight (TOF) and phase contrast of protons that move through the bloodstream.
They were used in the study of the renal arteries,
but the clinical application was not very extensive,prolonged acquisition times and image artifacts have generally limited their use.
From the second half of the nineties is developed contrast material– enhanced MRA,
using a 3D rapid gradient echo sequence and bolus intravenous gadolinium with short acquisition time,
this allows for...
Imaging findings OR Procedure details
We evaluate the utility and diagnostic capability of 3D-sequence Inhance Inflow-IR (IFIR).
It is a technique that combines sequence ASL (arterial spin labeling) with SSFP (steady state free precession).
Use:
Selective inversion pulse (IR) was applied to suppress the signals from the renal vein blood and stationary tissue (green volume,
figure1).
Spectral fat saturation pulse that enhancing the suppression of the signal from fat and increases the visibility of arterial signal.
A saturation band inferior was used to suppress the signal of the venous flow,...
Conclusion
The new 3D Inhance Inflow IR sequence with respiratory compensation produces images of high diagnostic quality and good correlation with conventional angiography of the renal arteries,
renal graft artery and aortoiliac sector without intravenous contrast,
which is great importance in patients with impaired renal function,
in those who are not capable of respiratory apneas and in patients allergic to contrast.
References
Nonenhanced MR Angiography.
M Miyazaki and VS Lee.
Radiology 2008; 248:20-43.
Unenhanced MR Angiography: techniques and clinical Applications in patients with Chonic Kidney Disease.
S.
Morita,
A.Masukawa,
K.
Suzuki,
m.
hirata et al.
Radiographics 2011; 31 (2): E13-E33.
ECG-gated Nonenhamced 3D Steady-State Free Precession MR Angiography in Assessment of Transplant Renal arteries: comparison with DSA.
RS Lanzman,
A.
Voiculescu,
C.
Walher,
A.
Ringelstein et al.
Radiology 2009,252: 914-921.
Imaging of renovascular disease.
R.
Sidhu and E.
Lockhart.
Seminars in ultrasound CT and MRI.
2009; 30:271-288....
Personal Information
Jorge Argimiro López García and Carmen Nieves Pérez Brito
IMETISA - Complejo Hospitalario Universitario de Canarias.
[email protected]
La Laguna - Tenerife - Spain.
Ignacio Gonzalez Garcia,
Helio Valles Gonzalez and Francisco Javier Diaz Romero.
Vascular and Intervencional Radiology.Complejo Hospitalario Universitario de Canarias.
La Laguna - Tenerife - Spain.
