Transducer types

Question	Answer
What are the 7 types of transducers?	Linear sequenced array, curved sequenced array, phased linear sequenced array, phased curved sequenced array, vector array, linear phased array, annular phased array
Aka linear array or linear switched array	Linear sequenced array
Operated by applying voltage pulses to groups of elements in succession	Sequencing
What type of transducer uses sequencing, produces a rectangular image, has no steering or focus, and is considered old technology?	Linear sequenced array
What are the advantages of linear sequenced array?	Beams creating images are parallel at all depths, very accurate measure, no internal moving parts
What is the disadvantage of linear sequenced array?	Large footprint, can't use between the ribs, and has a fixed focus
Also called curved, curvilinear, or convex array	Curved sequence array
Curved line of elements	Convex (bowed out)
What type of image does a curved sequenced array create?	A blunted sector image
What type of transducer has lines that are steered outward by curved design, no focusing, operates by sequencing, and is considered old technology?	Curved sequenced array
What are the advantages of a curved sequenced array transducer?	Natural sector image, no internal moving parts
What are the disadvantages of a curved sequenced array transducer?	Fixed focus, large acoustic footprint, sound beam separates in the far field thus decreasing resolution and image quality
Another term for a transducer with multiple elements	Array
This type of transducer operates by applying voltage pulses to groups of elements in succession with small time delays	Phased linear sequenced array
How many elements does a phased linear sequenced array have?	200
Linear sequenced array with phasing for focus	Phased linear sequencing array
If you have a rectangle image you have ______	No steering
This transducer can be steered or can have phasing for steering on newer probes, and can be focused by phasing?	Phased linear sequenced array
Newer probes produce a _______image	Sector image
What is the advantage of phased linear sequenced array?	Dynamic focus
What is the disadvantage of phased linear sequenced array?	Expensive and complex
Also called curvilinear or convex	Phased curved sequenced array
With a phased curved sequenced array, where are the scan lines steered?	Outward
This transducer is identical to phased linear sequenced array, and the scan lines are steered outward, focused by phasing, and has a blunted sector image	Phased curved sequence array
What are the advantages of a phased curved sequence array?	Dynamic focus
What are the disadvantages of phased curved sequence array?	Expensive and complex
A linear sequenced array (operates by sequencing) and phasing for steering and focus.	Vector array
This transducer has a sector with a flat top, steers with phasing, and focuses by phasing?	Vector array
What are the advantages of a vector array?	Small footprint, dynamic focus, wide near field
What are the disadvantages of a vector array transducer?	Expensive and complex
Also called phased array	Linear phased array
This type of transducer operates with phasing, has a sector image with a pointed top, steers by phasing, and focuses by phases?	Linear phased array
This transducer produces a sector image with a pointed top?	Linear phased array
What are the advantages of the linear phased array?	Small footprint, dynamic focus
What are the disadvantages of linear phased array?	Narrow near field, expensive and complex
Also called annular array	Annular phased array
What type of image does a annular phased array produce?	Sector image with a small round notch at the top
This transducer is ring shaped, multi element, operates like a phased array by using phasing.	Annular phased array
What type of transducer produces a sound beam with a cone shape (focused by phasing), and can be focused in the a axis keeping section artifact to a minimum.	Annular phased array
What transducer creates a sector image and uses mechanical steering, although it is an electronic transducer?	Annular phased array
Can a annular phased array use electronic phasing?	No, due to the ring design
What are the advantages of a annular phased array?	Dynamic focusing in all dimensions including the z axis, small footprint
What are the disadvantages of a annular phased array?	Mechanical steering (moving parts), dynamic focus in all directions requires a long time to make a single image
What are the two ways a multi frequency transducer performs?	On/off switch mode, true multi-frequency
Activates one or the other frequency, uses only 1 frequency at a time, and it chooses which frequency to use.	On/off switch mode
Aka broad bandwidth mode	True multi-frequency
Multiple frequencies are transmitted and recieved	True multi-frequency
Describe a true multi frequency?	Provides broad bandwidth, improves resolution at all depths, and uses all the frequencies all the time.
Give an example of a state of the art transducer?	3D & 4D
State of the art transducers have what type of array?	Matrix array
What is the disadvantage of the matrix array?	Section thickness artifact
With linear arrays, how do you focus the z axis?	By adding a lens or curved element and is a fixed focus
What is the benefit of a matrix array?	Dynamic focusing in the z axis that can achieve elevation all resolution. (Perpendicular to imaging plane above and below)
What is the disadvantage of the matrix array?	Section thickness artifact

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	Created by ecmarchese over 10 years ago