[The peripheral circulation: ECG-gated magnetic resonance angiography].
This work was aimed at comparing magnetic resonance angiography (MRA) with and without ECG gating in the study of peripheral vessels. Ten volunteers, mean age 27.8 years, were examined with MRA of the femoral, popliteal and tibial segments. MRA was performed with a 1.5-T superconductive magnet, a transmit head coil and the TOF 2D technique. In all cases MRA was performed without cardiac gating and with different times of trigger delay (0, 20, 40, 70 and 200 ms). When comparing the different acquisitions, the number of vessels and the signal-to-noise (S/N) ratio were calculated. In the femoral segment, MRA without cardiac gating showed a mean of 7.7 vessels with 2.79 S/N ratio; MRA with 0 ms of trigger delay showed a mean of 13.1 vessels with 1.51 S/N ratio; MRA with 20 ms trigger delay showed a mean of 13.1 vessels with 1.52 S/N ratio; MRA with 40 ms trigger delay showed a mean of 13.2 vessels with 1.52 S/N ratio; MRA with 70 ms trigger delay showed a mean of 13.5 vessels with 1.50 S/N ratio; finally, MRA with 200 ms trigger delay showed a mean of 13.4 vessels with 1.50 S/N ratio. In the popliteal segment, the corresponding values were 6.4 vessels and 2.51 S/N ratio, 11.4 vessels with 1.54 S/N ratio, 11.3 vessels and 1.54 S/N ratio, 11.6 vessels and 1.52 S/N ratio, 11.8 vessels and 1.52 S/N ratio and, finally, 11.9 vessels and 1.52 S/N ratio. In the tibial segment, the corresponding values were 8.5 vessels and 1.84 S/N ratio, 14.4 vessels and 1.14 S/N ratio, 14.5 vessels and 1.17 S/N ratio, 14.5 vessels and 1.14 S/N ratio, 14.3 vessels and 1.17 S/N ratio and, finally, 14.5 vessels and 1.19 S/N ratio. To conclude, MRA with cardiac gating better visualized peripheral vessels whatever the trigger delay.
Carriero
A
A
Istituto di Scienze Radiologiche e Formazione dell'Immagine, Università G. D'Annunzio, Chieti.
Baratto
M
M
Tamburri
L
L
Samuele
F
F
D'Angelo
C
C
Bonomo
L
L
D000328:Adult; D016477:Artifacts; D001775:Blood Circulation; D004562:Electrocardiography / Q000379:methods* / Q000706:statistics & numerical data; D005263:Femoral Artery / Q000033:anatomy & histology; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods* / Q000706:statistics & numerical data; D011150:Popliteal Artery / Q000033:anatomy & histology; D016909:Tibial Arteries / Q000033:anatomy & histology