2. M u chnh xc ch n on VRT trn lm sng 65-82%. Hnh nh h c ng vai
tr quan tr ng trong c i thi n chnh xc ch n on, lm gi m ph u thu t
khng c n thi t. CT l kh o st chu n ng i l n, siu m tr em v ph n c
thai. MRI l ph ng php thay th ch n on. 3. Vai tr c a MRI trong VRT
c p Theo tiu chu n thch h p c a Hi p h i X quang M , CT l kh o st
hnh nh t t nh t nh gi VRT c p ng i l n. Siu m c p l ph ng php u tin
thch h p nh t ch n on VRT ph n c thai. MRI c nhi u u i m h n CT
trong nh gi VRT c p: khng c nguy c do b c x , thch h p cho ph n c
thai v tr em. MRI khng ph thu c vo ng i lm nh siu m. MRI h n siu m
trong tr ng h p b nh nhn n ng cn, bo ph, ph n c thai, b nh nhn b ng
ch ng h i, ru t th a sau manh trng ho c v tr b t th ng. 4. MRI vs.
Siu m nh y (%) chnh xc (%) Gi tr d bo m (%) MRI 97 95 96 Siu m 76
82 74 Incesu L, Coskun A, Selcuk MB, et al. Acute appendicitis: MR
imaging and sonographic correlation. AJR 1997;168:669-74 5. H n ch
c a MRI Th i gian kh o st di nh gi do c ng H n ch trong c p c u t
ti n B t ti n cho BS X quang khi c c p c u Cn t ti li u trong y vn.
6. Protocol MRI khi nghi VRT c p 1. T2W HASTE (SSFSE) 3 m t ph ng
vng b ng d i nh v ru t th a. 2. Axial v Coronal TSE T2W FS 3. Axial
T1W FS 4. Axial STIR 5. Axial T1W FLASH 3D FS (SPGR) tr c v sau
tim. Cc mt ct c th ty chn khi BS X quang xem xt khi kho st 7. T1W
T2W FS STIR -ng knh 6mm Lng RT l p y d ch, tn hi u cao trn
T2W/STIR. Dy thnh ru t th a, tn hi u cao trn T2W B t thu c thnh RT
r trn T1W FS Thay i quanh ru t th a Tng tn hi u m quanh RT trn
T2W/STIR G i th ng Kh ngoi lng RT (tn hi u th p en trn cc chu i
xung) T d ch ho c abscess. Du hiu vim quanh rut tha c bit hu ch khi
khng xc nh c rut tha. MRI hn ch trong vic nh gi ton b chiu di RT v
si RT. 10. RT ln, tn hiu cao trn T2W FS 11. RT ln, bt thuc thnh r
rt 12. Nguyn nhn th ng g p nh t trong ph u thu t khng do s n khoa H
thai >30% n u v ,
