Accelerated spiral Fou rier velocity encoded MRI using SPIRiT … · yra-Leite rece from the Brazi...
1
Introd cause carotid substa accele We in Spira and re transfo SPIRi (SPIR recons Data EXCI coil. S FOV, resolu Metho 4-fold spiral techni SPIRi square Resul results veloci accele spatia since The r compl impor hence FVE [ results obtain veloci error r Concl using reduce enable tempo Ackno initiat logica the Un S. Nay Refer Nayak Frayn MRM 2007. Sutton [10] h duction: Fourier loss of diagnos d arteries [4,5]. antially faster. T erated spiral FVE vestigate the use l FVE: The puls efocusing gradien orm along k x -k y , iT: The iterativ RiT) approach [7 struction method acquisition: Sp TE HD system Scan parameters 5 cm/s velocity ution. Scan time ods: Parallel im d spatially-under FVE dataset. T iques: sum-of-s iT [7,10]. Resul es result. lts: A qualitativ s for 2-fold acce ity domain (Fi eration (see Fig l undersampling the majority of t esults in Fig. 2 letely remove rtant result, as w improve the te [6]. A quantitati s are consistent ned with sum-of ity domain. Wit ratios higher tha lusions: We hav SPIRiT parallel e spatial aliasing e the use of a l oral resolution fo owledgment: L ion fellowship al and Scientific niversity of Sou yak. The authors rences: [1] Mor k KS. MRM 57:6 e R and Rutt B M 63:1537, 2010. [7] Lustig M an n BP. IEEE TS http://eecs.berkel Accelera 1 Depa r velocity encod stic information Although the sc The scan time in E can be improv e of the iterative se sequence con nts [2]. The acqu followed by a C ve self-consiste 7] is an autocali d, based on self- piral FVE scans (40 mT/m, 150 s: 1.4×1.4×5 mm y resolution over was 146 second maging accelerat rsampled dataset The undersample squares using N lts were compar ve evaluation o eleration, in bot ig. 2). Poor re . 1). In the vel g typically result the aliasing sign show that 2-fo aliasing artifact e intend to use S emporal resoluti ive evaluation is tly better (high f-squares recons th 2-fold accele n 10 dB for all e ve demonstrated l imaging. In fu g in temporally-a less-selective U or high velocities Lyra-Leite rece from the Brazi c Development ( uthern California s thank Kyunghy ran PR. MRI 1 639, 2007. [3] T BK. MRM 34:3 . [6] Carvalho JL nd Pauly JM. MR SP 51:560, 2003 ley.edu/~mlustig ated spiral Fou D artment of Electric ding (FVE) [1] is in phase-contra can-time of 2DF n FVE can be s ved if spatial ali self-consistent p sists of slice-sele uired data consis Cartesian inverse nt parallel ima brated coil-by-c consistency. were performed 0 T/m/s), using m 3 spatial resol r a 240 cm/s FO s (256 heartbeat ion was evaluat ts, obtained from ed data was reco NUFFT [8,9], red with the ful of the SPIRiT r th spatial domain esults were ob locity distributio ts in increased s nal is associated old accelerated ts (see error im SPIRiT to reduce ion of temporall s presented in T er signal-to-erro struction, in bot eration, SPIRiT evaluated voxels d 2-fold acceler uture works, we accelerated spira UNFOLD filter, s. ived a ProIC/D ilian National C (CNPq). Imagin a in collaboration yun Sung for use :197, 1982. [2] Tang C et al. JMR 378, 1995. [5] C LA and Nayak K RM 64:457, 2010 3. [9] http://eecs g/Software.html urier velocity Davi Marco Lyra-L al Engineering, U s useful in the as st imaging [3]. FT FVE is prohib significantly red asing due to tem parallel imaging ective excitation st of a temporall e Fourier transfo aging reconstruc coil parallel ima d on a GE Signa a 4-channel car ution over a 16 OV, 12 ms temp ts at 105 bpm). ted using 2-fold m the fully-sam onstructed using and image-dom lly-sampled sum results shows g n (Fig. 1) and t btained with 4- ons, aliasing du signal at v = 0 c with static mate SPIRiT was abl mages). This is e spatial aliasing ly-accelerated s Table 1. The SPI or ratio) than t th spatial and t achieved signa . ration of spiral F will use SPIRi al FVE [6]. This which will imp DPP/UnB scien Counsel of Tec ng was performe n with Prof. Kri eful discussions. Carvalho JLA RI 3:377, 1993. Carvalho JLA e KS. ISMRM 15: 0. [8] Fessler JA s.umich.edu/~fe encoded MRI Leite 1 , and Joao L. University of Brasíl ssessment of valv FVE has also b bitively long for duced using tem mporal undersam g reconstruction ( n, a velocity-enc ly-resolved stack orm along k v , pro ction aging a 3T rotid 6 cm poral d and mpled two main m-of- good time- -fold ue to cm/s, erial. le to s an g and piral IRiT those time- al-to- FVE iT to will prove ntific hno- ed at shna and [4] et al. :588, A and ssler Fig. 1: squares factors. T Fig.2: T using 2- fully-sam right inte Table 1: results, i sum-of- SPI sum-of- SPI I using SPIRiT A. Carvalho 1 lia, Brasília, Distr vular disease [2] been proposed as r clinical use, th mporal accelerati mpling is reduced (SPIRiT) metho oding bipolar gr k-of-spirals in k x oduces the spatio Magnitude axia (top row) and S These were reco Time-velocity d -fold accelerated mpled reference ernal carotid arte : Signal-to-error in comparison w sp im -squares 2× IRiT 2× 1 -squares 4× IRiT 4× 1 T parallel ima rito Federal, Brazi ], as it eliminate s a method for he spiral FVE m ion [6]. The tem d. This may be d [7] to accelera radient along z, a x -k y -k v space [2]. o-temporal-veloc al images of th SPIRiT (bottom onstructed from M distributions fro d SPIRiT (cente e (top row): (a) ery; and (c) left r ratio (in dB) f with the fully-sam patial mages right e caroti arter 7.9 9.7 14.4 10.3 4.7 4.9 10.1 6.6 aging il es partial volume measuring wall ethod [2] shows mporal resolutio achieved using ate the acquisitio a 4 ms spiral rea . A non-Cartesia city distribution, he neck obtaine row), with diffe M(k x ,k y ,k v ,t) for om select voxe er row), in com right external c carotid bifurcati for 2-fold and 4 mpled reference. ext. id ry right int carotid artery 8.1 3 13.1 4.2 7.7 e effects that ma shear rate in th s promise, as it i on of temporally parallel imaging on of spiral FVE adout, and spoile an inverse Fourie , m(x,y,v,t). ed using sum-of erent acceleratio k v = 0 and t = 0. ls, reconstructe mparison with th arotid artery; (b ion. 4-fold accelerate . left carotid bifurcation 9.7 12.5 5.3 7.5 y he is y- g. . er er f- n d he b) d 1189 Proc. Intl. Soc. Mag. Reson. Med. 20 (2012)
Transcript of Accelerated spiral Fou rier velocity encoded MRI using SPIRiT … · yra-Leite rece from the Brazi...
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ReferNayakFraynMRM2007. Sutton[10] h
duction: Fourierloss of diagnos
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ution. Scan time
ods: Parallel imd spatially-under
FVE dataset. Tiques: sum-of-siT [7,10]. Resules result.
lts: A qualitativs for 2-fold acceity domain (Fieration (see Figl undersamplingthe majority of tesults in Fig. 2letely remove rtant result, as w
improve the te[6]. A quantitatis are consistentned with sum-ofity domain. Witratios higher tha
lusions: We havSPIRiT parallel
e spatial aliasinge the use of a loral resolution fo
owledgment: Lion fellowship
al and Scientificniversity of Souyak. The authors
rences: [1] Mork KS. MRM 57:6e R and Rutt B
M 63:1537, 2010.[7] Lustig M an
n BP. IEEE TShttp://eecs.berkel
Accelera1Depa
r velocity encodstic information Although the sc
The scan time inE can be improve of the iterative
se sequence connts [2]. The acqu followed by a C
ve self-consiste7] is an autocalid, based on self-
piral FVE scans (40 mT/m, 150
s: 1.4×1.4×5 mmy resolution overwas 146 second
maging acceleratrsampled dataset
The undersamplesquares using Nlts were compar
ve evaluation oeleration, in botig. 2). Poor re. 1). In the vel
g typically resultthe aliasing sign show that 2-foaliasing artifacte intend to use Semporal resolutiive evaluation istly better (highf-squares reconsth 2-fold accelen 10 dB for all e
ve demonstratedl imaging. In fug in temporally-aless-selective Uor high velocities
Lyra-Leite recefrom the Brazi
c Development (uthern Californias thank Kyunghy
ran PR. MRI 1639, 2007. [3] TBK. MRM 34:3. [6] Carvalho JLnd Pauly JM. MRSP 51:560, 2003ley.edu/~mlustig
ated spiral FouD
artment of Electric
ding (FVE) [1] isin phase-contra
can-time of 2DFn FVE can be sved if spatial aliself-consistent p
sists of slice-seleuired data consisCartesian inverse
nt parallel imabrated coil-by-cconsistency.
were performed0 T/m/s), using m3 spatial resolr a 240 cm/s FOs (256 heartbeat
ion was evaluatts, obtained from
ed data was recoNUFFT [8,9], red with the ful
of the SPIRiT rth spatial domainesults were oblocity distributiots in increased s
nal is associated old accelerated ts (see error imSPIRiT to reduceion of temporalls presented in Ter signal-to-errostruction, in boteration, SPIRiT evaluated voxels
d 2-fold acceleruture works, weaccelerated spira
UNFOLD filter, s.
ived a ProIC/Dilian National C(CNPq). Imagina in collaborationyun Sung for use
:197, 1982. [2]Tang C et al. JMR378, 1995. [5] CLA and Nayak KRM 64:457, 20103. [9] http://eecsg/Software.html
urier velocity Davi Marco Lyra-Lal Engineering, U
s useful in the asst imaging [3].
FT FVE is prohibsignificantly redasing due to temparallel imaging
ective excitationst of a temporalle Fourier transfo
aging reconstruccoil parallel ima
d on a GE Signaa 4-channel carution over a 16OV, 12 ms tempts at 105 bpm).
ted using 2-foldm the fully-samonstructed using
and image-domlly-sampled sum
results shows gn (Fig. 1) and t
btained with 4-ons, aliasing dusignal at v = 0 cwith static mateSPIRiT was ablmages). This ise spatial aliasingly-accelerated s
Table 1. The SPIor ratio) than tth spatial and tachieved signa
.
ration of spiral F will use SPIRi
al FVE [6]. Thiswhich will imp
DPP/UnB scienCounsel of Tecng was performen with Prof. Krieful discussions.
Carvalho JLA RI 3:377, 1993. Carvalho JLA eKS. ISMRM 15:0. [8] Fessler JAs.umich.edu/~fe
encoded MRILeite1, and Joao L.
University of Brasíl
ssessment of valvFVE has also bbitively long for
duced using temmporal undersamg reconstruction (
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ction aging
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ntific hno-ed at shna
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Fig.2: Tusing 2-fully-samright inte
Table 1:results, i
sum-of-SPI
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I using SPIRiT A. Carvalho1 lia, Brasília, Distr
vular disease [2]been proposed asr clinical use, th
mporal acceleratimpling is reduced(SPIRiT) metho
oding bipolar grk-of-spirals in kxoduces the spatio
Magnitude axia(top row) and SThese were reco
Time-velocity d-fold acceleratedmpled referenceernal carotid arte
: Signal-to-errorin comparison w
spim
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T parallel ima
rito Federal, Brazi
], as it eliminates a method for
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radient along z, ax-ky-kv space [2].o-temporal-veloc
al images of thSPIRiT (bottom onstructed from M
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r ratio (in dB) fwith the fully-sam
patial mages
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7.9 9.7 14.4 10.34.7 4.9 10.1 6.6
aging
il
es partial volumemeasuring wall ethod [2] shows
mporal resolutioachieved using
ate the acquisitio
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he neck obtainerow), with diffeM(kx,ky,kv,t) for
om select voxeer row), in comright external ccarotid bifurcati
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1189Proc. Intl. Soc. Mag. Reson. Med. 20 (2012)
