Assertion: doppler ultrasound | /r/HasProperty | preferable
Facets:
value: in many cases
type: TEMPORAL
value: to x-ray angiography
type: OTHER
Source sentences:
text: Doppler ultrasound is an indispensable diagnostic tool in all areas of ultrasound testing and is preferable in many cases to X-ray angiography because it does not require injecting the patient with contrasting dye.