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Physics Flashcards > Chapters 5-7 > Flashcards

Chapters 5-7 Flashcards

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0
Q

changes the shape of an electronic signal to improve the focus

A

Apodization

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1
Q

Size of source

A

Aperture

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2
Q

A collection of active elements within a trasducer housing

A

Array

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3
Q

Minimum distance 2 structures are seperated from front to back (anterior to posterior) and still distiguished as seperate by the ultrasound machine.

A

Axial

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4
Q

Along the axis of the ultrasound beam

A

Axial Resolution

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5
Q

Out of transducer into the body

A

Beam

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6
Q

Man made piezoelectric elements that is close to soft tissue

A

Composite

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7
Q

Crystals arranged in an arc

A

Convex Array

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8
Q

Main componite in a transducer producing piezoelectric current

A

Crystal

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9
Q

The amount the piezoelectric elements are heated

A

Currie Point

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10
Q

Bonded element to the back of the active element. limits the “ringing” of the crystals.

A

Damping

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11
Q

AKA spatial resolution, the machines ability to see and differentiate small structures and represent them anatomically correct on the ultrasound image.

A

Detail Resolution

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12
Q

Used to improve resolution

A

Dynamic Focusing

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13
Q

Made of natural or man made material, used to convert energy in the transducer.

A

Element

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14
Q

Slice thickness

A

Elevational Resolution

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15
Q

The region that lies beyond the distance of one near zone length (Fraunhofer zone)

A

Far Zone

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16
Q

Near zone length

A

Focal Length

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17
Q

Where the beam is the narrowest

A

Focal Region

18
Q

Area of highest most uniform beam intensity

A

Focal Zone

19
Q

Improves accuracy of image by narrowing the “waist” of the beam

A

Focus

20
Q

lobes at various angles to the main beam

A

Grating Lobes

21
Q

Side to Side dimension

A

Lateral

22
Q

AKA transverse resolution. The minimum distance that two side by side structures can be seperate and still show 2 seperate echoes on the screen

A

Lateral Resolution

23
Q

The man made element that ultrasound transducer use

A

Lead Zirconate Titanate

24
Q

External Focusing

A

Lens

25
Q

AKA phased array. Elements arranged in a line with a small array

A

Linear

26
Q

Parallel scan lines that are perpendicular to the transducer face to give a rectangle feild of view

A

Linear Array

27
Q

Arranged in a line with a flat face, is electronically steered and gives a wide feild of view

A

Linear Phased Array

28
Q

AKA linear swithed. Multiple elements arranged in a line that are fired in a sequence.

A

Linear Sequenced Array

29
Q

Reduces reflections at transducer to tissue interface (impedance matching layer)

A

Matching Layer

30
Q

AKA resonant Frequency. Operating frequency of a transducer.

A

Natural Focus

31
Q

Region between the transducer and the focus (Fresnel Zone)

A

Near Zone

32
Q

Frequency of a transducer (Resonant frequency)

A

Operating Frequency

33
Q

AKA electronic sector

A

Phased Array

34
Q

Arranged in a line with a flat face, is electronically steered and gives a wide feild of view

A

Phased Linear Array

35
Q

When a mechanical force is applied to a certain materials they create a voltage.

A

Piezoelectricity

36
Q

Transducer

A

Probe

37
Q

The machines ability to image structures with accuracy

A

Resolution

38
Q

Operating frequency, at the center of the bandwidth (Natural Frequency)

A

Resonance Frequency

39
Q

Crystals arranged in an arc and produce fan shaped image

A

Sector

40
Q

When energy from the transducer radiates at various angles of the transducer face

A

Side Lobes

41
Q

Any devise that converts one form of energy to another

A

Transducer

42
Q

Combination of phased array electronics and linear sequential array probes to provide electronic steering and multiple focal zones

A

Vector Array

Physics Flashcards (6 decks)

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