TRADITIONAL POSTER - ismrm

Poster Sessions
1424. Non-Contrast-Enhanced Renal Venography Using Spatial Labeling with Multiple Inversion Pulses (
SLEEK )
Hao Shen 1 , Guang Cao 2
1 Applied Science Laboratory, GE Healthcare, Beijing, China; 2 Applied Science Laboratory, GE Healthcare, Hong Kong, China
Renal venogram is important in clinical diagnosis but difficult to image with the existing MRI technique. In this study, we developed a non-contrastenhanced
renal venography using a spatial labeling with multiple inversion pulses prepared balanced steady-state free precession sequence.
1425. Fast Vessel Scout Imaging Based on Continuously Moving Table Acquisitions of Projection Data
Sandra Huff 1 , Michael Markl 1 , Ute Ludwig 1
1 Department of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany
MRA of the peripheral arteries is typically based on a contrast enhanced multistation bolus-chase approach, which requires good synchronization of data
acquisition, table motion and arterial passage of the contrast agent bolus. These challenges imply the need for careful planning for the consecutive
acquisitions of the several stations and prior knowledge of the vessel geometry would thus be desirable. This study presents the implementation of a fast
peripheral vessel scout based on Continuously Moving Table acquisition of projection data with Time-of-Flight (TOF) contrast. The variation of arterial
TOF signal during the cardiac cycle was exploited to enhance blood-background contrast.
1426. Optimization and Comparison of Non-Contrast-Enhanced Inflow-Sensitive Inversion Recovery BSSFP
for Renal and Mesenteric MRA at 1.5T and 3.0T
Caroline Denison Jordan 1,2 , Pauline Wong Worters 1 , Shreyas S. Vasanawala 1 , Bruce L. Daniel 1 , Marc T.
Alley 1 , Moritz F. Kircher 1 , Robert J. Herfkens 1 , Brian A. Hargreaves 1
1 Radiology, Stanford University, Stanford, CA, United States; 2 Bioengineering, Stanford University, Stanford, CA, United States
Contrast-enhanced MR angiography is a widely accepted technique for imaging the kidneys, but there are many reasons to explore non-contrast-enhanced
MRA methods, including contraindication of gadolinium for patients with kidney disease. We evaluated one non-contrast enhanced MRI technique which
has shown promising results: respiratory-triggered bSSFP with In Flow Inversion Recovery (IFIR). We optimized the inversion times at 1.5T and 3T, and
then quantitatively and qualitatively compared images of renal and mesenteric arteries. We found better relative contrast and better visualization of renal and
mesenteric arteries at 3T. An inversion time of 800 ms gave the optimal relative contrast.
1427. Feasibility of Refocused Turbo Spin Echo (RTSE) for Clinical Noncontrast MRA
Samuel W. Fielden 1 , John P. Mugler III 1,2 , Patrick T. Norton 2,3 , Klaus D. Hagspiel 2,3 , Christopher M.
Kramer 2,3 , Craig H. Meyer 1,2
1 Biomedical Engineering, University of Virginia, Charlottesville, VA, United States; 2 Radiology, University of Virginia,
Charlottesville, VA, United States; 3 Medicine, University of Virginia, Charlottesville, VA, United States
rTSE hybridizes the increased signal provided by the 180° refocusing RF pulses of RARE and the better flow performance of the fully-refocused gradients
and phase alternation of balanced SSFP. Here we demonstrate the feasibility of the rTSE sequence in a clinical setting by acquiring angiograms via the
rTSE sequence in patients scheduled for peripheral runoff examinations and, in one patient, by comparing the rTSE angiogram to a TOF angiogram.
1428. Whole Body TOF Mouse Magnetic Resonance Angiography
William Lefrançois 1 , Wadie Ben Hassen, Stéphane Sanchez, Jean-Michel Franconi, Eric Thiaudière,
Sylvain Miraux
1 Résonance Magnétique des Systèmes Biologiques, UMR 5536 CNRS-Univ. Bordeaux 2, Bordeaux, Gironde, France, Metropolitan
Vascular diseases, particularly atherosclerosis, are a major health problem in developed countries. In some cases, stenosis can become critical and cause
coronary heart disease necessitating surgical interventions. Therapy planning in patients with multiple stenosis could be facilitated by using whole body
angiography. MR angiography (MRA) method currently used on human, is first-pass MRA using a Gadolinium contrast agent. However, this method can
not be used on small animal models. This study aimed to develop a fast Time-of-Flight-MRA method able to screen the whole body in reasonable
acquisition times and assess the degree and extent of stenosis.
1429. The Origins of Bright Blood MPRAGE at 7 Tesla and a Simultaneous Method for T1 Imaging and
Non-Contrast MRA
John W. Grinstead 1 , William Rooney 2 , Gerhard Laub
1 Siemens Healthcare, Portland, OR, United States; 2 Oregon Health and Science University
MPRAGE is a widely used pulse sequence for T1-weighted anatomical imaging. It has been reported that blood appears extremely bright in MPRAGE at 7
Tesla, and provides excellent vascular information. However, the mechanism for this has not been completely explained. The present work explains the
primary source of bright blood MPRAGE at 7 Tesla, and based on this understanding proposes a new technique providing simultaneous high-resolution T1
MPRAGE imaging and non-contrast angiography with excellent background suppression.
1430. Volumetric Phase Contrast Flow Imaging with Multiple Station Isocenter Acquistion Substantially
Improves Flow Results
Andreas Greiser 1 , Mehmet Akif Gulsun 2 , Arne Littmann 1 , Jens Guehring 2 , Edgar Mueller 1
1 Siemens AG Healthcare Sector, Erlangen, Germany; 2 Siemens Corporate Research, Princeton, NJ, United States
Vector-encoded MR phase contrast acquisitions covering a bigger volume show larger errors in velocity due to eddy currents and gradient non-linearities. A
new scan method is presented that acquires the volumetric dataset in multiple z-isocentered steps. The resulting corrected velocity images and the influence
on the flow quantification results of the descending aorta and flow field visualization were analyzed. The multiply isocentered approach results in an overall
increase of peak velocity estimates and flow values. The pixelwise standard deviation of the calculated background phase correction matrices across slices
for fixed table position was 1.76 cm/sec vs. 0.61 cm/sec for z-isocentered.