Chapter 3 Transducers - Vocabulary
Size of a transducer element (single-element)
Size of a group of elements (array)
Nonuniform driving of elements in an array to reduce grating lobes
A transducer assembly containing several piezoelectric elements
In the direction of the transducer axis (sound travel direction
The minimum reflector separation along the sound path that is required to produce separate echoes.
Region containing continuous wave sound; region through which a sound pulse propagates
Combination of a piezoelectric polymer.
curved linear array
Temperature at which an element material loses its piezoelectric properties.
Material attached to the rear face of a transducer element to reduce pulse duration; the process of pulse duration reduction.
The ability to image fine detail and to distinguish closely spaced reflectors
a thin flat circular object
Aperture that increases with increasing focal length to maintain focal width
Continuously variable reception focusing that follows the increasing depth of the transmitted pulse as it travels
The detail resolution in the direction perpendicular to the scan plane. It is equal to the section thickness and it the source of section thickness artifact.
The region of a sound beam in which the beam diameter increases as the distance from the transducer increases.
Distance for a focused transducer to the center of a focal region or to the location of the spatial peak intensity
Region of minimum beam diameter and area.
length of the focal region
The concentration of the sound beam into a smaller beam area than would exist otherwise.
Additional weaker beams of sound traveling out in directions different from the primary beam as a result of the multielement structure of transducer arrays
perpendicular to the direction of sound travel.
Minimum reflector separation perpendicular to the sound path that is required to produce separate echoes.
Lead Zirconate Titanate
A ceramic piezoelectric material.
A curved material that focuses a sound or light beam
array made up of rectangular elements arranged in a line
Linear Phased Array
Linear array operated by applying voltage pulses to all elements, but with small time differences (phasing) to direct ultrasound pulses out in various directions.
Linear sequenced Array
Linear array operated by applying voltage pulses to groups of elements sequentially.
Material attached to the front face of a transducer element to reduce the reflections at the transducer surface.
the narrowing of a sound beam that occurs with an unfocused flat transducer element
The region of a sound beam in which the beam diameter decreases as the distance from the transducer increases.
Preferred (maximum efficiency) frequency of operation of a transducer
An array that steers and focuses the beam electronically (with short time delays)
Phased Linear Array
Linear sequences array with phased focusing added; linear sequenced array with phased steering of pulses to produce a parallelogram-shaped display.
Conversion of pressure to electric voltage
The ability to distinguish echoes in terms of space, time, or strength (called detail, temporal, and contrast resolution.)
A geometric figure bounded by two radii and the arc of the circle included between them.
Ability of an imaging system to detect weak echoes
Weaker beams of sound traveling out from a single element in directions different from those of the primary beam
The region of a medium that contains virtually all of the sound produced by transducer
An emitter of ultrasound; transducer
A device that converts energy from one form to another
transducer elements with damping and matching materials assembled in a case.
A device that converts electric energy to ultrasound energy, and vice versa
Linear sequenced array that emits pulses from different starting points and (by phasing) in different directions