Criado por ecmarchese
mais de 10 anos atrás
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Questão | Responda |
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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