Firstauditions Groping Hands Preview

ultrasound is in physical sound wave that can not be perceived by man to be at a higher frequency than the ear can grasp. This limit is aproximdamente in the 20 KHz. In contrast, other animals such as bats, dolphins and dogs, able to hear these frequencies, and even used as radar to navigate and hunt.

Ultrasound is used in many fields of science and technology. For example, on Medicaid is used for diagnostic ultrasound (ultrasonography), physiotherapy, econografía, teeth cleaning, liposuction, etc.

The industry is used to measure distances, nondestructive testing, internal characterization of materials, cleaning surfaces, etc..

Militarily ultrasound can be used as a weapon. Uses

Ultrasounds are used both in industrial applications (measuring distances, internal characterization of materials, nondestructive testing and others) and medicine (see for example

ultrasound, physiotherapy

, ultrasonotherapy ). In the medical field is called the ultrasound equipment to devices such as fetal doppler, which uses ultrasound waves 2 to 3 MHz to detect the fetal heartbeat in the womb. What is the ultrasound imaging

general

Ultrasound gallbladder Ultrasound kidney Ultrasound liver , involves exposing part of the body to high-frequency sound waves to produce images inside the body. Ultrasound exams do not use ionizing radiation

Ultrasound imaging, also called ultrasound scanning or sonography

(used in X-ray

). Because ultrasound images are captured in real time, can show the structure and movement of the body's internal organs, as well as blood flowing through blood vessels. The ultrasound imaging is a noninvasive medical test that helps physicians diagnose and treat medical conditions.

Conventional ultrasound displays the images in thin, flat sections of the body. Advances in ultrasound technology include three-dimensional ultrasound (3-D) that transforms the data of acoustic waves in 3-D images. Ultrasound images of a four-dimensional (4-D) consists of a 3-D ultrasound in motion.

A Doppler ultrasound study may be part of an ultrasound examination.

The Doppler ultrasound

is a special ultrasound technique that evaluates blood as it flows through blood vessels, including arteries and major veins of the body found in the abdomen, arms, legs and neck.

There are three types of Doppler ultrasound:

The

color Doppler uses a computer to convert Doppler measurements into an array of colors to display the speed and direction of blood flow through a blood vessel. The

• Power Doppler is a newer technique that is more sensitive than color Doppler and capable of providing greater detail of blood flow, especially in the vessels found within the organs. However, power Doppler does not help the radiologist determine the direction of flow, which may be important in some situations. Spectral Doppler
• . Instead of displaying Doppler measurements visually, Spectral Doppler displays blood flow measurements graphically, depending on the distance traveled per unit of time.