Date post: | 14-Dec-2015 |
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Objectives
• Basic science
• Terminology
• Examples – Movies
• What we should and should not be doing
Disclosures
• Becoming more of a techy.
• I have lost my touch for subclavians
• I tried to trade my kids in for a machine(It did not work)
Anatomy of a wave
• Velocity = wavelength x frequency• High frequency wave travel more linear and
reflected easier
Velocity through material• Velocity of a
wave is a constant through a given substance
(at a constant temperature)
• Assumption made all velocity about 1540 m/s
Medium Speed (m/s)
Blood 1566
Brain 1505-1612
Fat 1446
Kidney 1567
Liver 1556
Muscle 1542-1656
Bone 2070-5350
Water 1480
Air 333
Brass 4430
Shadowing
• The lateral edge shadow is a thin acoustic shadow that appears behind edges of cystic structures.
Terminology
Image Interpretation:• Anechoic / Echolucent - Complete absence of
returning sound waves, area is black. • Hypoechoic - Structure has very few echoes
and appears darker than surrounding tissue. • Hyperechoic / Echogenic - Opposite of
hypoechoic, structure appears brighter than surrounding tissue.
Terminology Image Acquisition / Probe Positions:• Transverse Plane - Also known as an axial
plane or cross section, separates the superior from the inferior, or, the head from the feet.
• Sagittal Plane - Oriented perpendicular to the ground, separating left from right. The "midsagittal plane" is a sagittal plane that is exactly in the middle of the body.
• Coronal Plane - Also known as the frontal plane, separates the anterior from the posterior or the front from the back.
• Oblique Plane - The probe is oriented neither parallel to, nor at right angles from, coronal, sagittal or transverse planes.
• Longitudinal Plane - The longitudinal plane is perpendicular to the transverse plane an can be either the coronal plane or sagittal plane.
• http://www.youtube.com/watch?v=fntJ7GLjCSU
• http://www.youtube.com/watch?v=VF_OGTSdSlo&feature=channel
• http://www.youtube.com/watch?v=Sb1bM8MnpRk&feature=channel
• http://www.youtube.com/watch?v=XpN1R7A0r_0&feature=channel
• http://folk.ntnu.no/stoylen/strainrate/Ultrasound/
• http://www.sonoguide.com/physics.html