may chup cong huong tu

7/28/2019 May Chup Cong Huong Tu

1/21

LOGO

www.themegallery.com

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


2/21

LOGO


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


3/21

LOGO


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.


4/21

LOGO


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


5/21

LOGO


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


6/21

LOGO


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.


7/21

LOGO


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.


8/21

LOGO


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


9/21

LOGO


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


10/21

LOGO

Cu To MRI

Cu to ca cun pht thu sng in t


11/21

LOGO

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


12/21

LOGO


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.


13/21

LOGO


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.


14/21

LOGO


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.


15/21

LOGO


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.


16/21

LOGO


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


17/21

LOGO



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


18/21

LOGO



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


19/21

LOGO


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.


20/21

LOGO


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.


21/21

LOGO

may chup cong huong tu

Documents