Please forward this error screen to sharedip-13214820582. Please forward this error screen to 120. This article is about using ultrasound to image the human body. For the diagnostic technique of identifying children at risk of animals in research, see Preclinical imaging.
For the tactile alphabet called “sonography”, see Night writing. Many different types of images can be formed using sonographic instruments. The most well-known type is a B-mode image, which displays the acoustic impedance of a two-dimensional cross-section of tissue. Compared to other prominent methods of medical imaging, ultrasound has several advantages. It provides images in real-time, it is portable and can be brought to the bedside, it is substantially lower in cost, and it does not use harmful ionizing radiation.
Sonography is effective for imaging soft tissues of the body. A general-purpose ultrasound scanner may be used for most imaging purposes. Usually specialty applications may be served only by use of a specialty transducer. Most ultrasound procedures are done using a transducer on the surface of the body, but improved diagnostic confidence is often possible if a transducer can be placed inside the body. For this purpose, specialty transducers, including endovaginal, endorectal, and transesophageal transducers are commonly employed. In anesthesiology, Ultrasound is commonly used by anesthesiologists to guide injecting needles when placing local anaesthetic solutions near nerves. It is also used for gaining vascular access such as central venous cannulation and difficult arterial cannulation.