RT Book, Section
A1 Bailey, April A.
A1 Twickler, Diane M.
A2 Fleischer, Arthur C.
A2 Abramowicz, Jacques S.
A2 Gonçalves, Luis F.
A2 Manning, Frank A.
A2 Monteagudo, Ana
A2 Timor, Ilan E.
A2 Toy, Eugene C.
SR Print(0)
ID 1151030271
T1 Magnetic Resonance Imaging in Obstetrics
T2 Fleischer's Sonography in Obstetrics and Gynecology: Textbook and Teaching Cases, 8e
YR 2017
FD 2017
PB McGraw-Hill Education
PP New York, NY
SN 9781259641367
LK obgyn.mhmedical.com/content.aspx?aid=1151030271
RD 2024/04/25
AB Key  TermsDiffusion-weighted  imaging  (DWI):  an  MR  sequence  that  has  increased  signal  when  Brownian  motion  of  water  molecules  is  restricted,  such  as  highly  cellular  tumors,  fibrosis,  hypoxic  edema  of  the  brain,  and  abscess  with  viscous  content.Fat  suppression:  various  techniques  used  to  make  fat  dark  (low  signal  intensity)  on  MR  images  in  order  to  highlight  other  tissues  and,  depending  on  the  technique  used,  confirm  the  presence  of  fat  within  a  structure.Magnetic  resonance  (MR)  imaging:  a  modality  that  uses  high-field-strength  magnets,  radio  frequencies,  and  a  computerized  analysis  to  produce  detailed  in  vivo  images  of  internal  anatomy  of  the  body.Orthogonal  views:  MR  views  at  right  angles  to  each  other,  typically  axial,  coronal,  and  sagittal  views  of  the  fetus.Signal-to-noise  ratio  (SNR):  the  amount  of  desired  signal  or  useful  information  divided  by  the  background  level  of  false  data  or  noise.  High  SNR  results  in  a  clear  image.Steady-state  MR  imaging:  an  MR  technique  that  is  rapid  with  excellent  SNR  and  relatively  motion  insensitive  based  on  a  fast  gradient  echo  sequence.T1-weighted  imaging:  MR  technique  that  is  less  sensitive  for  fetal  anatomy  but  highlights  characteristics  of  fat,  certain  stages  of  bleeding,  liver  parenchyma,  and  meconium  in  the  colon  at  later  gestations  based  on  sequences  using  a  short  repetition  time  and  short  echo  time.  Simple  fluid  is  dark  (low  signal  intensity)  on  a  T1-weighted  image.T2-weighted  imaging:  MR  technique  that  defines  fetal  anatomy  and  dysmorphology  with  specific  tissue  characteristics  based  on  a  spin  echo  sequence  using  a  long  repetition  time  and  long  echo  time.  Simple  fluid  is  white  (high  signal  intensity)  on  a  T2-weighted  image.