What is Ultrasound?
Ultrasound is cyclic sound pressure with a frequency greater than the upper
limit of human hearing. Ultrasound is thus not separated from "normal" (audible)
sound based on differences in physical properties, only the fact that humans
cannot hear it. Although this limit varies from person to person, it is
approximately 20 kilohertz (20,000 hertz) in healthy, young adults. 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, a property also used by animals such as bats for hunting. The most
well known application of ultrasound 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
to capture their size, structure and any pathological lesions with real
time tomographic images. Ultrasound has been used by radiologists and
image the human body for at least 50 years and has become one of the
used diagnostic tools in modern medicine. The technology is relatively
inexpensive and portable, especially when compared with other
as magnetic resonance imaging (MRI) and computed tomography (CT).
also used to visualize fetuses during routine and emergency prenatal
diagnostic applications used during pregnancy are referred to as
Obstetric ultrasound can be used to identify many conditions that would be
harmful to the mother and the baby. Many health care professionals consider the
risk of leaving these conditions undiagnosed to be much greater than the very
small risk, if any, associated with undergoing an ultrasound scan.
Sonography is used routinely in obstetric appointments during pregnancy, but the
FDA discourages its use for non-medical purposes such as fetal keepsake videos
and photos, even though it is the same technology used in hospitals.
Obstetric ultrasound is primarily used to:
Date the pregnancy (gestational age)
Confirm fetal viability
Determine location of fetus, intrauterine vs ectopic
Check the location of the placenta in relation to the cervix
Check for the number of fetuses (multiple pregnancy)
Check for major physical abnormalities.
Assess fetal growth (for evidence of intrauterine growth restriction (IUGR))
Check for fetal movement and heartbeat.
Determine the sex of the baby
Ultrasound scanners have different Doppler-techniques to visualize arteries and
veins. The most common is colour doppler or power doppler, but also other
techniques like b-flow are used to show bloodflow in an organ. By using pulsed
wave doppler or continuous wave doppler bloodflow velocities can be calculated.
Ultrasound is also increasingly being used in trauma and first aid cases, with
emergency ultrasound becoming a staple of most EMT response teams. Furthermore,
ultrasound is used in remote diagnosis cases where teleconsultation is required,
such as scientific experiments in space or mobile sports team diagnosis.
For any Ultrasound Equipment not listed here, please do not
hesitate to call