2023年12月5日 · A Doppler ultrasound can estimate how fast blood flows by measuring the rate of change in its pitch, also called frequency. A technician trained in ultrasound imaging, called a sonographer, performs the Doppler ultrasound. The sonographer presses a small hand-held device against the skin over the area of your body being examined.

2023年12月5日 · 回答 Sheldon G. Sheps, M.D. 多普勒超声是一种无创检查，可用于测量流过血管的血流。其工作原理是高频超声波在碰到血流中循环的红细胞时会发生反射。常规超声使用声波生成图像，但不能显示血流。 多普勒超声可以帮助诊断 ...

2024年5月3日 · Risks. Diagnostic ultrasound is a safe procedure that uses low-power sound waves. There are no known risks. ...

2025年1月15日 · The ultrasound technician may use a Doppler ultrasound, which shows blood flowing through the arteries. In a Doppler ultrasound, the rate of blood flow is translated into a graph. There have been many advances in carotid ultrasounds to improve the quality and resolution of the images.

2024年11月5日 · Risks. There are no known risks. Abdominal ultrasound is a safe, painless procedure. But you may have some brief discomfort if the healthcare professional presses on an area that is sore or tender.

Endoscopic ultrasound is a procedure that combines endoscopy and ultrasound to create images of the digestive tract and nearby organs and tissues.

2023年6月24日 · During a fetal ultrasound, a device called a transducer is placed on the pregnant person's belly. Or in some cases, it may be placed in the vagina or on the area between the vagina and the anus.

2021年8月31日 · You might have Doppler ultrasonography — a noninvasive test that can be used to estimate blood flow through blood vessels by bouncing high-frequency sound waves (ultrasound) off circulating red blood cells. This test can be used to measure blood flow within your penis that would suggest ischemic or nonischemic priapism.

2023年12月5日 · ¿Qué es la ecografía Doppler? Respuesta de Sheldon G. Sheps, M.D. La ecografía Doppler es una prueba no invasiva que puede usarse para medir el flujo de sangre que pasa por los vasos sanguíneos. Funciona emitiendo ondas sonoras de alta frecuencia en los glóbulos rojos que circulan por el ...

2023年4月19日 · The goal in treating carotid artery disease is to prevent stroke. Treatment depends on how blocked the carotid arteries are, whether the blockage is causing symptoms, and the age and other illnesses of the person who has the blockage.