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Ultrasound Imaging Basics

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Display Monitor

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Displays the real-time images generated by the ultrasound machine.

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Time Gain Compensation (TGC)

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Adjusts the brightness of the image at different depths to compensate for attenuation.

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Gel

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Medium that helps in the transmission of ultrasound waves from the transducer to the body.

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M-mode (Motion Mode)

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Displays movement of structures over time, often used to measure cardiac structures.

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Dynamic Range

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The ratio between the largest and smallest signal strengths that the ultrasound machine can handle.

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Control Panel

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Contains knobs, switches, and controls to adjust the ultrasound machine's settings.

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B-mode (Brightness Mode)

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Displays the ultrasound information as dots of varying brightness, forming a 2D image.

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Transducer/Probe

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Used to send and receive the ultrasound waves.

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Doppler Effect

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The change in frequency or wavelength of the ultrasound waves as they reflect off moving objects, like blood.

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Pulse Control

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Controls the electrical pulses that the transducer sends into the body.

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Spectral Doppler

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Used to visualize blood flow velocity over time in a graphical representation.

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Anisotropy

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Dependency of the echo intensity on the angle of the ultrasound beam in relation to the structure being imaged.

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Gain

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Adjusts the amplification of the reflected ultrasound signals.

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Real-time Imaging

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The ability of the ultrasound machine to generate immediate images during scanning.

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Gray Scale

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The range of brightness in the B-mode image representing the different intensities of echoes received.

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Pulsed-Wave Doppler

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Uses pulses of ultrasound to measure the velocity of moving structures, such as blood, at a specific location.

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Echogenicity

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The ability of a tissue to produce echoes and reflect the ultrasound waves back to the transducer.

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Acoustic Impedance

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A property of tissue that affects how much ultrasound beam is reflected at boundaries.

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Attenuation

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Reduction in the intensity of the ultrasound beam as it travels through tissue.

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Isoechoic

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Describes structures that produce a similar amount of echoes to the surrounding tissue, thus appearing similar in echogenicity.

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Aliasing

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Misrepresentation of Doppler velocities that occurs when the measured velocity exceeds the Nyquist limit of the pulse-wave Doppler.

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Continuous-Wave Doppler

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Uses continuous ultrasound beams to measure the velocity of moving structures, like blood, throughout the beam path.

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Hypoechoic

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Refers to structures that produce fewer echoes and appear darker than surrounding tissues.

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Harmonic Imaging

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Uses the non-linear propagation of ultrasound through tissue to enhance image quality.

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Frequency

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The number of oscillations per second of the ultrasound wave, affecting image resolution and penetration.

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Hyperechoic

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Refers to structures that produce more echoes and appear brighter than surrounding tissues.

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Anechoic

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Refers to a structure that does not produce echoes and appears black on the ultrasound image.

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