Keywords:
Abdomen, Obstetrics (Pregnancy / birth / postnatal period), Foetal imaging, MR, Diagnostic procedure, Education and training, Artifacts, Obstetrics
Authors:
G. Papaioannou1, P. Tagalakis1, I. zambelis1, N. Kritikos1, C. Malamateniou2; 1Athens/GR, 2LONDON/UK
DOI:
10.1594/ecr2018/C-2057
Methods and materials
A total of 26 placental MRIs (including a twin pregnancy with kissing placentae) were performed in a HFO MRI at 1.0Tesla static magnetic field.
Indications included sonographic findings of placenta previa (22/26),
history of a previous pregnancy with placenta accreta (1/26),
placental mapping in triplets (1/26) and uterine hemorrhage (2/26).
Median gestational age was 29+5 weeks (range 14w+2 to 36w+6).
Twenty women had a history of previous caesarean section.
Standard MRI protocol included Single Shot SPAIR sequences,
Single Shot T2W and T1W IR,
all in coronal and sagittal planes,
and additionally T2W sequences in the axial plane.
All scans were performed after maternal hydration in order to achieve sufficient bladder filling for better tissue delineation.
Imaging results were compared to the operative findings.
The protocols were optimised to ensure the highest possible SNR and finest spatial resolution.
Please find below a table of some key protocol parameters:
|
T2W/BH
SPAIR SAG
|
SSH
SPAIR SAG
|
SSH
SPAIR TRA
|
SSH
T2W
SAG
|
SSH
T2W
TRA
|
T1W IR SAG |
T1W IR TRA |
N of Sl |
24 |
36 |
36 |
36 |
36 |
36 |
36 |
THK(mm) |
6 |
4 |
4 |
4 |
4 |
4 |
4 |
Resolution |
248x177 |
228x158 |
228x158 |
208x132 |
220x142 |
212x212 |
212x212 |
Scan Time |
1:43 |
3:36 |
3:36 |
1:48 |
1:48 |
2:00 |
2:00 |
TR/TE |
1321/100 |
625/64 |
625/64 |
1208/150 |
1400/150 |
29991/400 |
29991/400 |
NSA |
2 |
2 |
2 |
1 |
1 |
1 |
1 |