mri field strength

7/24/2019 MRI Field Strength

1/30

GI TR S DNG

CC MC T TRNG

MY CNG HNG T

Ts.L VnPhc

BnhvinChRyHi ngh CHA

Cn Th-2015


2/30

NI DUNG

I-i cng MRI-t trng

II-Mc t trng v kh nngng dng

III-La chn

IV-Kt lun


3/30

I-i cng

MRI v mc t trng


4/30

MRI l k thut hnh nh khng xm ln

S dng t trng, sng RF, proton

nc to hnh

CNG HNG T (MRI)


5/30

TO HNH MRI

T trng l quantrng nht trongto hnhCng ttrng=Cht

lng, tnh nng


6/30

T trng

MC T TRNG

Ttrngthp : < 0.5T

Ttrngtrung bnh : 1.5 - 3T*


7/30

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


8/30

T TRNG CAO BT THUN LI

Vn an ton (


9/30

II-MC T TRNG

V KH NNG NG DNG


10/30

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


11/30

1. NG DNG LM SNG

MRI T TRNG THP-TRUNG BNH


12/30

Mai Tan N., 1959, t qu gi 5Siemens: Concerto 0.3T

MRI 0.3T


13/30

MRI 0.3T

Tran Thi H. 1935, di cnSiemens: Concerto 0.3T


14/30

2.SO SNH NG DNG LM

SNG MRI T TRNG CAO1.5 T V 3.0 T


15/30

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


16/30

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


17/30

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


18/30

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


19/30

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


20/30

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


21/30

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


22/30

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


23/30

3. NG DNG LM SNG

MRI T TRNG SIU CAO


24/30

Chi titgiiphu Chcnng

M hc

NGHIN CU

MRI 7T

www.siemens.com,7T


25/30

III-LA CHN


26/30

LA CHN

Nhu cuchnhlm sng Skhost, bnhnhn (gi, dngccan

thip, c thai)

Thngqui>


27/30

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


28/30

IV- KT LUN


29/30

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)


30/30

XIN CHN THNH

CM N

mri field strength

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