Real time 3D sonography of the normal fetal heart--clinical evaluation

Abstract

Aim of the study was to determine the clinical feasibility of real time 3D ultrasound in the examination of the normal fetal heart compared to conventional 2D fetal echocardiography. Twenty fetuses with normal hearts at 20 to 38 weeks of gestation underwent real time 3D ultrasound. Examination data were stored on an external notebook. Later analysis and interpretation was done by a different sonographer using a special software. In the assessment of the four chamber view and the out flow tracts real time 3D ultrasound was equivalent to conventional ultrasound. Advantages of realtime 3D ultrasound were the possibility of later time-independent off-line analysis and post-processing of volume data and generation of new views not available in 2D imaging. Disadvantages included low frame rate (16 frames/s), low lateral resolution and the lack of Doppler and colour information. Simultaneous display of 3 different views of the fetal heart as well as the construction of spatial perspectives ("new views") provide additional useful information to conventional fetal echocardiography. Later off-line analysis of 3D volume data can be used for sequential analysis of the normal fetal heart with good diagnostic results. Currently it remains unclear whether this new method may provide additional important information in the assessment of fetal congenital heart defects.