Chapters 5-7

Question 0

changes the shape of an electronic signal to improve the focus

Answer 0

Apodization

Question 1

Size of source

Answer 1

Aperture

Question 2

A collection of active elements within a trasducer housing

Answer 2

Array

Question 3

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

Answer 3

Axial

Question 4

Along the axis of the ultrasound beam

Answer 4

Axial Resolution

Question 5

Out of transducer into the body

Answer 5

Beam

Question 6

Man made piezoelectric elements that is close to soft tissue

Answer 6

Composite

Question 7

Crystals arranged in an arc

Answer 7

Convex Array

Question 8

Main componite in a transducer producing piezoelectric current

Answer 8

Crystal

Question 9

The amount the piezoelectric elements are heated

Answer 9

Currie Point

Question 10

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

Answer 10

Damping

Question 11

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

Answer 11

Detail Resolution

Question 12

Used to improve resolution

Answer 12

Dynamic Focusing

Question 13

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

Answer 13

Element

Question 14

Slice thickness

Answer 14

Elevational Resolution

Question 15

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

Answer 15

Far Zone

Question 16

Near zone length

Answer 16

Focal Length

Question 17

Where the beam is the narrowest

Answer 17

Focal Region

Question 18

Area of highest most uniform beam intensity

Answer 18

Focal Zone

Question 19

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

Answer 19

Focus

Question 20

lobes at various angles to the main beam

Answer 20

Grating Lobes

Question 21

Side to Side dimension

Answer 21

Lateral

Question 22

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

Answer 22

Lateral Resolution

Question 23

The man made element that ultrasound transducer use

Answer 23

Lead Zirconate Titanate

Question 24

External Focusing

Answer 24

Lens

Question 25

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

Answer 25

Linear

Question 26

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

Answer 26

Linear Array

Question 27

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

Answer 27

Linear Phased Array

Question 28

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

Answer 28

Linear Sequenced Array

Question 29

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

Answer 29

Matching Layer

Question 30

AKA resonant Frequency. Operating frequency of a transducer.

Answer 30

Natural Focus

Question 31

Region between the transducer and the focus (Fresnel Zone)

Answer 31

Near Zone

Question 32

Frequency of a transducer (Resonant frequency)

Answer 32

Operating Frequency

Question 33

AKA electronic sector

Answer 33

Phased Array

Question 34

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

Answer 34

Phased Linear Array

Question 35

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

Answer 35

Piezoelectricity

Question 36

Transducer

Answer 36

Probe

Question 37

The machines ability to image structures with accuracy

Answer 37

Resolution

Question 38

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

Answer 38

Resonance Frequency

Question 39

Crystals arranged in an arc and produce fan shaped image

Answer 39

Sector

Question 40

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

Answer 40

Side Lobes

Question 41

Any devise that converts one form of energy to another

Answer 41

Transducer

Question 42

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

Answer 42

Vector Array