Doppler ultrasonography is an enhancement to regular ultrasound evaluations. Doppler may be used to detail blood flow within a mare's ovary and the testes in the stallion, and for assessing fetal viability. The pulsed wave Doppler form of spectral Doppler provides detailed information over a relatively small area whereas color Doppler and power Doppler provide limited information over a larger region. Pulsed wave Doppler will allow for specific measurement of blood flow, enabling the calculation of flow indices. Power Doppler provides greater depiction of small blood vessels and lower flow rates than color Doppler and thus gives a better idea of total vascularity. The chapter discusses techniques for assessing a pregnant mare and fetus, a stallion and ovaries.
- Doppler ultrasonography
- Pregnant mare