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i hc Bch Khoa H NiVin in T Vin Thng
TM HIU MY CNG HNG T (MRI)GVHD:ThS.NCSHongQuangHuy
Nhmsinhvin thc hin:Phm Hng Sn
Phm ThThanh
Nguyn Th Tho
Nguyn Th HuynTrang
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Ni Dung
Lch S MRI1
Nguyn L MRI
c im MRI
2
3
Cu To MRI
So snh MRI v CT Scanner
4
4
5
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Khi Nim
Chp cng hng t (MRI) l mt kthut chn on y khoa to ra hnh nh
gii phu ca c th nh s dng ttrng v sng radio.
My chp cng hng t l mt thit bnhy cm v a nng gip ta thy hnhnh cc lp ct ca cc b phn c tht nhiu gc trong khong mt thigian ngn.
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Lch S
Felix Block v Edward Purcell pht hinra hin tng cng hng t ht nhn
vo nm 1946Nm 1980, chic my cng hng t
u tin c a vo p dng
Nm 1993, Function MRI c dng chn on cc chc nng v hot ngca no b
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Nguyn L MRI
Nguyn l c bn:
- cc tn thng bnh l u dn n s
thay i phn b nc ti v tr tnthng,nn ta s ghi hnh c ccthng tn.
- MRI s dng t trng mnh v mt hthng pht cc xung c tn s v tuyn iu khin hot ng in t canhn nguyn t
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Nguyn L MRI
- Da trn s tn ti ca nguyn t Hydrotrong cc m c th. Khi cc m c ttrong mt t trng cng ln, cc
Proton ca nguyn t Hydro s ccung cp nng lng di dng nhngsng tn s radio, khi ngng cung cpcc sng th h thng s hi tr nng
lng v cc Proton s pht ra tn hiuc my tnh x l, tnh ton v hinthnh hnh nh chn on.
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Cu To MRI
1. Nam chm to t trng B0 (Magnet) : Ttrng B0 nhm lmcho cc moment t (htnhn H) trong m sp xp theo mt hng xcnh.
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Cu To MRI
2. Cun dy to t trng bin thin theokhng gian G (Gx, Gy, Gz) (Gradient Coil) :
Cc t trng Gx, Gy, Gz dng chn lp ct
(khi cho mt thnh phn mt gi tr xc nh)hoc xc nh v trca im cn kho st
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Cu To MRI
3. Cun pht thu sng in t RF : B thupht RF to ra t trng B1 nhm to ra sthay i t trng ti mt v tr xc nh v thunhn t trng phn hi t m v tr ny (ttrng M). Tn hiu thu c (t trng M) ttrong c th pht ra l rt nh. Do , thit bcn c li chn t (shield) chng nhhng ca sng in t bn ngoi
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Cu To MRI
Cu to ca cun pht thu sng in t
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Cu To MRI
4. H thng my tnh x l : My tnh vcc ph kin qun l namchm, b pht-
thu v cun to t trng bin thin xl v lu tr tn hiu cng hng t; v ti to, lu tr v hin th nh
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ng dng, c im MRI
Chp cng hng t l mt k thutnhanh, gn khng gy nh hng ph,l mt phng php chn on hnh
nh hin i, hiu qu v ph bin trnth gii.
Ngy nay, MRI c s dng kimtra gn nh mi c quan trong c th.K thut ny c bit c gi tr trongvic chp nh chi tit no hoc dy ctsng.
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ng dng, c im MRI
K t khi MRI mang li nhng hnh nh3 chiu, bc s c th nm c thngtin v a im thng tn. Nhng
thng tin nh vy rt c gi tr trc khiphu thut chng hn nh tiu phuno.
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ng dng, c im MRI
V d khi chun on bnh U nonh cng hng t:
o Cc u no lnh tnh hoc c tch, u trong
no hoc ngoi no u nhn thy r trn nhcng hng t. Trn nh cng hng t cnhng u im sau:
o Ph quanh u trn nh cng hng t nhn r
hn nh ct lp vi tnh.o Trn nh cng hng t pht hin nhng u
c t trng thp hn i vi cc t chc no,m trn nh chp ct lp vi tnh khng pht
hin c.
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ng dng, c im MRI
hay bnh Ri lon tun hon no:
o MRI l mt k thut hon ho chnon chy mu ni s hoc tai bin
mch mu no trong giai on ti cptnh. MRI c th tin hnh ngay trong 6gi u sau khi b bnh.
o
MRI nhy cm hn vi trng hp taibin mch mu no nh, tin trin hoctai bin h s sau.
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So snh MRI vi CT Scanner
Chp ct lp in ton (CT Scan) s dng tiaX v h thng detector thu nhn tn hiu khcnhau ca tng im trn c th sau ti to
li hnh nh theo tng lt ct.Chp cng hng t (MRI) s dng t
trng lmphn cc cc nguyn t Hydro ctrong phn t nc ca c th.
To nh bng MRI khng gy tc dng phnh trong to nh bng chp X quangthng quy v chp CT
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So snh MRI vi CT Scanner
CT v MRI u l phng tin chn onhnh nh cao cp, thu nhn cc hnh nh
bnh l nm su trong c th chn onbnh. Hnh nh thu c c th ti to thnhhnh 3 chiu, lt ct rt mng v chi tit rtnh gip ch rt nhiu trong chn on.
MRI c th cung cp nhanh v chun xc sovi tia X trong vic chn on cc bnh vtimmch
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So snh MRI vi CT Scanner
MRI c u th hn CT trong chn on tqu do gip pht hin tt hn tn thngthiu mu, c chnh xc hn v gip chn
on nguyn nhn t qu. Nghin cu trncho thy MRI vt tri CT trong chn ont qu cp, t qu thiu mu cp v xuthuyt ni s mn tnh
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Vn an ton trong chp MRI
Tun theo s hng dn ca nhn vinphng chp MRI.
Tt c cc vt kim loi cn c ly ra trckhi chp ng thi khng mang cc vt dngc kim loi vo phng chp MRI.
c cht lng hnh nh tt, bnh nhn
khng c ng trong lc chp.
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Vn an ton trong chp MRI
Trong lc chp, nu c bt c yu cu no,bnh nhn c th trao i trc tip vi nhnvin iu khin my.
Bnh nhn khng cn nhn i trc khi chpMRI. Trong trng hp cn gym chpth bnh nhn phi nhn i 4 6 gi trckhi chp.
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