Advantages Relatively inexpensiveWidely availableCan be performed by the bedsideNon-invasiveNon-ionisingSafe in children and pregnancy Disadvantages Operator dependentCannot image lung or boneNot good for imaging obese patients or deep structuresSpecific issues with...
v = flow velocity (m/s)c = the speed of sound in tissues (m/s)fd = Doppler frequency shift that is received (Hz)cos θ = cosine of the angle between the sound beam and moving fluid (45°)fT = frequency of the transmitted ultrasound from the transducer...
Gain Focus Depth Dynamic Range Sector Width Frequency Describes the degree of amplification of the reflected signal that is receivedIf low gain is used, tissues that are poor reflectors will not be visualisedIf high gain is used noise is added to the image and it can...