Doppler ultrasound device is used by Jacqueline to measure changes in fetal heart rate when various repeated sounds are presented and then followed by a different sound.
In Europe throughout the 20th century, an obstetrician named Ian Donald created ultrasound diagnostics. Utilizing sound waves to create images of the inside of the body, ultrasound is a medical diagnostic tool.
Thus, Ultrasound is a technology used in medicine to create images of the inside of the body using sound waves. Jacqueline is measuring changes in fetal heart rate with a Doppler ultrasonography instrument by playing back numerous repeating sounds, followed by a different sound.
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