Keywords:
Arteries / Aorta, Cardiovascular system, Vascular, MR-Angiography, Diagnostic procedure
Authors:
A. Fischer, S. Orzada, S. Johst, M. E. Ladd, K. Nassenstein, T. Lauenstein, S. Maderwald; Essen/DE
DOI:
10.1594/ecr2013/C-2343
Methods and Materials
Study population:
MR scanner and coil system:
- Magnetom 7 T (Siemens,
Erlnagen,
Germany)
- Custom-built 16-channel transmit/receive coil [6] (Fig.
1)
- Manual positionable AngioSURF table for multistation imaging (Fig.2)
- TIAMO (Time-interleaved acquisition of modes) [7]
Sequence parameters:
|
T1w 2D FLASH
|
T1w TurboFLASH
|
Repetition time TR [ms]
|
14
|
700
|
Echo time TE [ms]
|
5.26
|
3.84
|
Flip angle FA [°]
|
80
|
80
|
Bandwidth [Hz/pixel]
|
1300
|
930
|
Slice orientation
|
transversal
|
transversal
|
Slices
|
60
|
60
|
Slice thickness [mm]
|
2
|
2
|
Field-of-view FOV [mm2]
|
390 x 293
|
390 x 293
|
Voxel volume [mm3]
|
1.0x 1.0 x 2.0
|
1.0 x 1.0 x 2.0
|
Acquisition matrix [pixel]
|
384 x 288
|
384 x 288
|
Parallel imaging with GRAPPA
|
Yes (R = 4)
|
Yes (R = 4)
|
Reference lines
|
32
|
32
|
Gating
|
no gating
|
Phonocardiogram
|
Acquisition time TA [min:s]
|
2:41
|
4:00
|
Analyzed artery segments:
- Iliacal (Common iliac artery,
Internal iliac artery,
External iliac artery)
- Femoral (Superficial femoral artery,
Profunda femoral artery)
- Popliteal (Popliteal artery)
- Tibiofibular (Anterior tibial artery,
Posterior tibial artery,
Fibular artery)
- Foot (Dorsalis pedis artery)
Qualitative assessment:
- Artery delineation,
signal intensity and homogeneity (5 = excellent,
1 = non diagnostic)
- Presence of artifacts (3 = no artifact,
1 = strong impairment)
Quantitative assessment:
- Contrast Ratio (CR = [Sartery-Smuscle]/[Sartery+Smuscle])