Showing posts with label ultrasound scan. Show all posts
Showing posts with label ultrasound scan. Show all posts

Saturday, April 13, 2013

Scan technique ii

Indications for 2nd & 3rd trimester scanning

  • Assigning dates
  • Assessing foetal growth, amniotic fluid volume, foetal heart motion & foetal presentation.
  • Assessing placental position & texture.
  • For review of foetal anatomy
  • To detect the presence of adenexal masses or cysts or uterine myomas
Scan technique
  • Bi parietal diameter measurement of the foetal head –BPD
  • BPD measurement is more accurate in the first trimester.
  • BPD is the distance between the anterior & posterior tables of the skull.
  • It is measured perpendicular to the mid line echo (falx)


 


Scan technique i

First trimester

Indications
  • Bleeding after a POA
  • Pain during pregnancy
  • Pregnancy complicated by fibroid or ovarian cyst
 
Preparation
Scans are performed though the full bladder using a 5 MHtz curvilinear probe.

Indications for first trimester sonography 
  • Localization of the GS –Intra uterine or Ectopic pregnancy
  • Identification of foetal viability
  • Anovular gestation
  • Estimation of POG
  • Assessment of multiple pregnancy, number of embryos chorionicity & amniocity

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