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SPI > Review > Flashcards

Review Flashcards

1
Q 
Which of the following has the same meaning as the transducer diameter 
A) crystal thickness 
B) Ceramic shape 
C)aperture 
D) pzt thickness
A

C

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2
Q

Which of the following determines the frequency of the sound created by a pulsed wave transducer ?
A) crystal thickness and impedance
B) speed of sound in ceramic and diameter
C) speed of sound and density of the ceramic
D) thickness and speed of sound in the ceramic

A

D

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3
Q

Which of the following determine the focal length of a sound beam?
A) crystal thickness and impedance
B) speed of sound in ceramic and frequency
C) frequency of sound and density of the ceramic
D) diameter of ceramic and frequency of sound

A

D

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4
Q

Which of the following determine the spread of a sound beam in the far field ?
A) crystal thickness and impedance
B) speed of sound in ceramic and frequency
C) frequency of sound and density of the ceramic
D) diameter of ceramic and frequency of sound

A

D

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5
Q 
Which of the following trans has the shallowest focus ? 
A) 4mhz, 4mm crystal diameter 
B) 4mhz, 6mm crystal dia
C) 6mhz, 4mm crystal dia 
D) 6mhz, 6mm crystal dia
A

A) hint: shallow, low frequency , small dia

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6
Q 
Which of the following trans  has the shallowest focus ? 
A) low frequency, largest crystal dia
B) low frequency, small crystal dia
C)high frequency, largest crystal dia 
D) high frequency, smallest crystal dia
A

B)

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7
Q

Which of the following trans has the deepest focus ?

A) 4mhz, 4mm crystal diameter
B) 4mhz, 6mm crystal dia
C) 6mhz, 4mm crystal dia
D) 6mhz, 6mm crystal dia

A

D)

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8
Q

Which transducer has the lowest intensity at the end of the near zone?

A) 4mhz, 4mm crystal diameter
B) 4mhz, 6mm crystal dia
C) 6mhz, 4mm crystal dia
D) 6mhz, 6mm crystal dia

A

D

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9
Q 
Which of the following trans  has the least divergence in the far field? 
A) low frequency, largest crystal dia
B) low frequency, small crystal dia
C)high frequency, largest crystal dia 
D) high frequency, smallest crystal dia
A

C)

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10
Q 
A sound beam is created by q round pzt crystal with a diameter of 10mm. The focal depth of the sound beam is 8cm. What is the diameter of the sound beam at a depth of 8cm? 
A) 8cm
B)3 mm
C) 5 mm 
D) 4 mm
A

C) 5mm

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11
Q

Which transducer has the lateral resolution in the far field?

A) 4mhz, 4mm crystal diameter
B) 4mhz, 6mm crystal dia
C) 6mhz, 4mm crystal dia
D) 6mhz, 6mm crystal dia

A

D) high frequency, larger diameter

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12
Q 
A sound beam is created by q round pzt crystal with a diameter of 10mm. The focal depth of the sound beam is 8cm. What is the diameter of the sound beam at a depth of 16cm? 
A) the same as the transducer dia
B) 3/4 the trans dia
C) half of the trans dia
D) 4mm
A

A

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13
Q

What is resolution ?

A

The ability to image accurately ( accuracy, not merely quality)

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14
Q

What is axial resolution?
Syn
LARRD- Longitudinal, axial, range, radial, depth

A

The ability to distinguish two structures that are close to each other front to back, parallel to, or along the beam’s main axis.

Short pulses has better resolution it has more details

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15
Q

What is the difference between axial resolution vs lateral resolution?

A

Axial is next to each other front and back

Lateral is side by side (:) ( best at focal point)

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16
Q

What improves LARRD resolution? (Axial)

A 
Less ringing (fewer cycle in a pulse)
High frequency( shorter spl and pulse duration)
17
Q

When is axial resolution at is best?

A

With high frequency trans and shorter pulses

18
Q

What is lateral resolution ? Lata- lateral, angular, transverse, azimuthal

A

The minimum distance that two structures are separated by side-to-side or perpendicular to the sound beam that produce two distinct echoes

19
Q

What is a point spread artifact ?

A

When 2 structure are closer together than the beam width, only one wide reflection is seen on the image

SPI (3 decks)

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