An ultrasound study that evaluates the direction and velocity of blood flow. An ultrasound study that evaluates the direction and velocity of blood flow. A method of displaying two-dimensional ultrasound images in which the amplitude of the reflected sound wave is translated to a shade of gray. The absence of an echo is black. A high amplitude echo is white.
Intermediate amplitudes are shades of gray.
By programming an ultrasound system to receive only the harmonic signals, the contrast agent is in the blood may be visualized and the surrounding tissue suppressed. A gas with a high High-Q factor has the potential to remain undissolved for a substantial length of time, such as five minutes. A gas whose stabilized, encapsulated bubbles are about the same size as a red blood cell. The essential flow of blood through the tissue of a normal organ. The duration of time following administration that a contrast agent remains useful in the diagnosis of a patient.