Keywords:
Diagnostic procedure, MR, Cardiovascular system, Cardiac, Arteries / Aorta, Haemodynamics / Flow dynamics
Authors:
M. Scarabello1, F. Secchi2, P. M. Cannao'2, M. Petrini1, G. Di Leo3, F. Sardanelli1; 1Milan/IT, 2Milano/IT, 3San Donato Milanese/IT
Methods and Materials
A total of 1,363 patients were included in the study.
The mean±sd age was 39.4±22.4 years.
Among them there were the following groups:
Condition
|
Number of patients
|
Normal cardiovascular magnetic resonance (CMR)
|
192
|
Congenital heart disease
|
225
|
Valvular heart disease
|
186
|
Thoracic aortic disease
|
143
|
Ischaemic and non-ischaemic cardiomiopathy
|
306
|
Other
|
311
|
TECHNIQUE
- 1.5 T MRI scanner with 12-channel coil
- 2D phase-contrast gradient recalled echo sequences with a through-plane velocity encoding gradient ranging from 150 to 350 cm/s
- Voxel size 1.8 x 1.8 x 6 mm
- One average
- TR 37.12 ms,
TE 2.47 ms,
FA 20°
- Parallel imaging GRAPPA: acceleration factor 2
- Retrospective ECG gating with 30 phases per cycle
- TR dependent on RR interval
Two dimensional (2D) phase-contrast gradient echo sequences
(TR 37.12 ms,
TE 2.47 ms) with a through-plane velocity encoding gradient ranging from 150 to 350 cm/s were performed on the ascending aorta.
Fig. 1
POST PROCESSING
Minimum and maximum aortic cross-sectional areas were measured and forward volume (FV) was acquired; AS was measured and a modified index was generated as a ratio between AS and FV.
Fig. 2 Fig. 3 Fig. 4