However, the procedure is not usually painful and doesn't take long.ĭoppler ultrasound for circulatory problemsĪ traditional ultrasound scan detects sound waves as they bounce off your tissues while a Doppler ultrasound scan detects sound waves bouncing off moving objects (eg blood cells) to measure their speed and how they flow through your body. You may feel some discomfort as the transducer is passed into your body. A small transducer will then be passed into your rectum. A small transducer will then be passed into your vagina.ĭuring a rectal ultrasound scan, you will be asked to lie down on your back or on your side with your knees pulled up to your chest. ![]() Internal ultrasound scans allow your doctor to get clearer images of your internal organs, such as the prostate, ovaries and womb.ĭuring a transvaginal ultrasound scan, you will be asked to lie down on your back or on your side with your knees bent upwards. The lubricating gel ensures smooth movement and continuous contact between the transducer and your skin. However, they are also used to examine your heart.Ī small, handheld transducer is placed on your skin, with a lubricating gel, and is moved over the part of your body being scanned. Your ultrasound scan will usually be carried out by a radiologist or a sonographer (a person trained in ultrasound scanning) who will also analyse the results of your scan.Įxternal ultrasound scans are often used to examine organs in your abdomen (eg kidneys and liver) and pelvis, as well as more superficial tissues such as your muscles and joints. Lower frequencies pass further into your body and therefore can create images of tissues deep inside your body, but the images are of poorer quality. This means high-frequency sound waves can’t create images of tissues deep inside your body. Higher frequencies produce better quality images but they are also absorbed by your skin and other tissues. Ultrasound scans that are used to diagnose conditions are usually performed at 2-18 Hertz. The unit of measurement for sound waves - their frequency - is Hertz. ![]() You can’t hear the sound waves produced - the term ultrasound refers to sound waves that are beyond the human hearing range. ![]() This information is sent to a computer that turns them into moving images in real-time. The sound waves bounce off the different tissues that make up your body and these echoes are detected by the ultrasound probe. An ultrasound scan (also called a sonogram) uses high-frequency sound waves to create pictures of the inside of the body.
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