Ac. Larson et Op. Simonetti, Real-time cardiac cine imaging with SPIDER: Steady-state projection imaging with dynamic echo-train readout, MAGN RES M, 46(6), 2001, pp. 1059-1066
Citations number
34
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
Steady-state projection imaging with dynamic echo-train readout (SPIDER) is
a multiecho radial k-space trajectory TrueFISP sequence developed for real
-time cine imaging of the heart. This new pulse sequence combines the super
ior SNR and blood-to-myocardium contrast of TrueFISP with the increased sca
n time efficiency of EPI and undersampled projection reconstruction. SPIDER
sequence RF repetition time (TR) was minimized by limiting the echo-train
to a length of three while acquiring the first and third echoes asymmetrica
lly. A temporal resolution of 45 ms was achieved with TR/TE1/TE2/TE3 of 3.2
4/0.6/1.6/2.6 ms and a factor of 2 view sharing scheme. Phantom experiments
showed little difference between the rootT(2)/T-1 weighting of the signals
acquired at each of the echo times but did show considerable off-resonance
modulation between them. In vivo experiments demonstrated the feasibility
of using the SPIDER sequence for real-time imaging in the cardiac short axi
s orientation. (C) 2001 Wiley-Liss, Inc.