Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults and thus, 20 kHz serves as a useful lower limit in describing ultrasound. The production of ultrasound is used in many different fields, typically to penetrate a medium and measure the reflection signature or supply focused energy. The reflection signature can reveal details about the inner structure of the medium. The most well known application of this technique is its use in sonography to produce pictures of fetuses in the human womb. There are a vast number of other applications as well.


Medical sonography (ultrasonography) is an ultrasound-based diagnostic medical imaging technique used to visualize muscles, tendons, and many internal organs, their size, structure and any pathological lesions with real time tomographic images. It is also used to visualize a fetus during routine and emergency prenatal care. Ultrasound scans are performed by medical health care professionals called sonographers. Obstetric sonography is commonly used during pregnancy. Ultrasound has been used to image the human body for at least 50 years. It is one of the most widely used diagnostic tools in modern medicine. The technology is relatively inexpensive and portable, especially when compared with modalities such as magnetic resonance imaging (MRI) and computed tomography (CT).

Free resourses

Ultrasound Forums – This forum features topics on utrasound and related issues.

Medmark Ultrasound Links – Links and resources for those seeking quality sites on sonography.

Ultrasound Glossary – A glossary of terms specific to sonography.

Cool 3-D Cases – University of British Columbia collection of 3D ultrasound images.

Echo in Context – Echo in Context is the longest standing and most watched recurring telemedicine event in the world.

Ultrasound Vendors – Links to a variety of new and used ultrasound vendors.

Echo-Web – Online Education, CMEs, CEUs, job opportunities, career connections, online resumes, conferences and seminars, echocardiography links, technology news, and other materials for echocardiographers.

Esonography.com – Online resource for professional sonographers. Provides information on international industry, professional organizations, publications, courses of instruction and jobs.

Imaging the Human Body with Ultrasound – by Elisabet O. Orville from Yale-New Haven Teachers Institute.

Introduction to Emergency Ultrasound – A review of justifications, indications and significant findings by Dr Godwin.

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