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7/24/2019 MRI Field Strength
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GI TR S DNG
CC MC T TRNG
MY CNG HNG T
Ts.L VnPhc
BnhvinChRyHi ngh CHA
Cn Th-2015
7/24/2019 MRI Field Strength
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NI DUNG
I-i cng MRI-t trng
II-Mc t trng v kh nngng dng
III-La chn
IV-Kt lun
7/24/2019 MRI Field Strength
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I-i cng
MRI v mc t trng
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MRI l k thut hnh nh khng xm ln
S dng t trng, sng RF, proton
nc to hnh
CNG HNG T (MRI)
7/24/2019 MRI Field Strength
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TO HNH MRI
T trng l quantrng nht trongto hnhCng ttrng=Cht
lng, tnh nng
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T trng
MC T TRNG
Ttrngthp : < 0.5T
Ttrngtrung bnh : 1.5 - 3T*
7/24/2019 MRI Field Strength
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T TRNG CAO: THUN LI
Tng t l tn hiu/nhiu SNR
Gim thi gian chp
Tng phn gii khng gian v thi gian Ci thin nhy v c hiu
Cc chui xung v ng dng lm sng
mi
Vivian S, radiology, 2007
7/24/2019 MRI Field Strength
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T TRNG CAO BT THUN LI
Vn an ton (
7/24/2019 MRI Field Strength
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II-MC T TRNG
V KH NNG NG DNG
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GI TR
MRI-0.3Tpngmtskthut(thnkinh, cxngkhp)
MRI 1.5 T thchinmtcch yhuht
cc kthut MRI-3T phn ln u th so vi 1.5T: c bit:
Thn kinh: DTI, fMRI, ASL, SWI, Angio
Mch mu: NATIVE
Ton thn: WB-DWI, spectrography, nh nh, cxngkhp(chi)
Tnenbaum LM, Magn Reson Imag Clin N Am, 2006
7/24/2019 MRI Field Strength
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1. NG DNG LM SNG
MRI T TRNG THP-TRUNG BNH
7/24/2019 MRI Field Strength
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Mai Tan N., 1959, t qu gi 5Siemens: Concerto 0.3T
MRI 0.3T
7/24/2019 MRI Field Strength
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MRI 0.3T
Tran Thi H. 1935, di cnSiemens: Concerto 0.3T
7/24/2019 MRI Field Strength
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2.SO SNH NG DNG LM
SNG MRI T TRNG CAO1.5 T V 3.0 T
7/24/2019 MRI Field Strength
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MRI THN KINH
Cutrc giiphu Mchmu (MRA) Khuchtn (DWI)
Hnh b sithnkinh(DTI, Tractography) Timu (PWI)
Ph(MRS) Chcnng(fMRI)
Tractography
3D MPR
MRI-3T phn ln u th so vi 1.5T:c bit: Thn kinh: DTI, fMRI, ASL,
SWI, Angio
7/24/2019 MRI Field Strength
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CT SNG
Chi tit gii phu(ty c, ngc)
Thi gian
Bnh l ty, mchmu
Tr.T.T.N., N, 1978
T2W
Med-T2W
T1W
7/24/2019 MRI Field Strength
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MRI 3T: BNG-CHU
u im Phn gii khng gian Phn giithigian Tng phn hnh nh
K thut MRCP MRI khuchtn MRI ph
Mchmu
Merkle EM, Magn Reson Imag Clin N am, 2006Kevin J. Chang, Radiographics, 2008
MRI 3T phnlntthn1.5 T.SNR, CNR >< SAR, xonh
7/24/2019 MRI Field Strength
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MRI 3T: C XNG KHP
3.0 T so vi 1.5 T Phn gii khng gianx 2
Phn gii thi gian x 4
phn gii Chi tit gii phu, tn thng
Cu trc sn khp (hng, gi, ctay, c chn)
Cu trc nh (sn vin, phc hpsn si tam gic bn tay/TFCC),dy chng nh, thn kinh
Thi gian
Ramnath RR., Magn Reson Imag Clin N Am, 2006
7/24/2019 MRI Field Strength
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MRI-3T: TIM MCH
Hnh thi, chc nng Ti mu( MRI-3T > 1.5T,
MRI-3T > SPECT: 0.89/0.7*)
Sng cnc tim (tngquang hn, thun li hn 1.5T)
Mch vnh
MRI 3T: nhiu
Nandalur KR, J Am Coll Cardiol 2007
Christiane K., Radiology, 2008V Th. Th., N,1973
7/24/2019 MRI Field Strength
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MRI 3T:MCH MU
Chi tit
Kho st c Gd hoc
khng Gd (MRI 3T) nh gi ng hc mchmu
nh gi thnh mch
mu: MRI 3T=1.5T(1)
Ng.T.L.A., N, 1982 Ng.V.K., Nam, 1964
C Gd
Khng dng Gd
William S. Kerwin, J Magn Reson Imaging, 2008
7/24/2019 MRI Field Strength
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MRI 3T: V
MRI 3 T Dynamic CE; DWI
MRI Spectroscophy
Ch nhMRI 1.5 T
MRI 3.0T
MRI 3T> 1.5T T: Cht lng hnh nh
Ci thin cht lngchn on cc tnthng tng quang
Christiane, Radiology, 2006
7/24/2019 MRI Field Strength
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MRI TON THN
Chi tit, trng kho st rng,thi gian nhanh
K thut: STIR, DWI (WB-DWI) Pht hin, m tctnh tn
thng, nhgi png iu tr Ch nh: Gim liu tia (tr em, c thai) Hn ch CT c cn quang Tm sot ty xng
Theo di, nh gi iu tr U kch thc nh t ngm FDG
Trn P. T., Nam, 1955, K di cn hach, phi, xng
STIR DWISchmidt GP, Radiology, 2010
Anwar R. Padhani, Radiology, 2011
7/24/2019 MRI Field Strength
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3. NG DNG LM SNG
MRI T TRNG SIU CAO
7/24/2019 MRI Field Strength
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Chi titgiiphu Chcnng
M hc
NGHIN CU
MRI 7T
www.siemens.com,7T
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III-LA CHN
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LA CHN
Nhu cuchnhlm sng Skhost, bnhnhn (gi, dngccan
thip, c thai)
Thngqui>
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MC T TRNG >< CHTLNG HNH NH
Mcttrng: quan trng Ngoi ra:
Tinbphnmm
Cuhnh my
Khnngsdng
Thct: My ttrngcao: c(tuitrung bnh M: 11.4
nm), c pnht?, ngisdngmy
Ngcli
2013, IMV Medical Division
7/24/2019 MRI Field Strength
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IV- KT LUN
7/24/2019 MRI Field Strength
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KT LUN
Mcttrngl yutquan trngnhtlinquan cht lnghnh nh, khnngpngyu culm sng
Yu cumc t trngmy lin quan nhucungisdng, kinh ph
Khuynh hng s dng t trng cao vsiu cao (>1.5 T)
7/24/2019 MRI Field Strength
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XIN CHN THNH
CM N