Physical basis of Doppler ultrasound imaging - Medical Physics - MCQs

Question

Doppler shift applies to:

Answer 1

All wave phenomena

Answer 2

Ultrasound

Answer 3

Infrared EM waves

Answer 4

Protection of the body from harmful ultrasound

Answer 5

Efficient transmission of sound waves into the tissue

Answer 6

Improvement of skin elasticity in the area of study

Answer 7

Deep body targets

Answer 8

Moving body targets

Answer 9

Surface targets

Answer 10

Radiowaves

Answer 11

Ultrasound

Answer 12

By one dimensional image

Answer 13

By two dimensional image with artificial coloring

Answer 14

The infrared spectrum of light, studied by Doppler

Answer 15

The frequency generated by ultrasonic transducer

Answer 16

The difference between emitted and reflected (received) frequency between to objects in relative motion.

Answer 17

Yes, when Δf > 0 erythrocytes move towards the transducer

Answer 18

Yes, when Δf > 0erythrocytes move away from the transducer

Answer 19

No, the sign of Δf does not tell the direction of motion

Answer 20

The frequency difference between emitted and received signals for observers at relative motion

Answer 21

The difference in acoustic impedance between two transmitting mediums

Answer 22

The intensity difference between emitted and reflected waves

Answer 23

Θ = 45⁰ (cos 45 = 0.7)

Answer 24

Θ = 90⁰ (cos 90 = 0)

Answer 25

Θ = 60⁰ (cos 60 = 0.5)

Answer 26

The properties of the tissue

Answer 27

The properties of the apparatus

Answer 28

The speed of (ultra)sound does not depend on the tissue

Answer 29

Ultrasound generation

Answer 30

X-ray tubes

Answer 31

Everywhere where light propagates

Answer 32

Therapeutic application of ultrasound

Answer 33

Diagnostic application of ultrasound

Answer 34

Method for sterilization

Answer 35

Damage internal organs

Answer 36

Increase temperature of tissues

Answer 37

Rearrange water molecules

Answer 38

Soft tissue

Answer 39

Ultrasound is completely harmless for humans and animals

Answer 40

Sound reflection depends on the transparency of the medium

Answer 41

Sound impedance does not depend on frequency (for linear mediums)

Answer 42

Audible sound: 103 Hz—106 Hz

Answer 43

Infrasound: 3 Hz—10 Hz

Answer 44

Ultrasound: 10 kHz—10 kHz

Answer 45

Ultrasound

Answer 46

Infrasound

Answer 47

Ultraviolet

Answer 48

Ultrasound detectors

Answer 49

Ultrasound generators

Answer 50

Electrophoresis

Answer 51

Electric polarization of solids under mechanical stress

Answer 52

Electro-mechanical coupling of objects falling off the tower of Pisa

Answer 53

Electric polarization in a solid due to temperature gradient.

Answer 54

No, the human body exhibits only capacitive properties

Answer 55

No, piezoelectric properties are observed in inorganic crystals

Answer 56

Yes, tissue such a collagen has piezoelectric properties

Answer 57

The size of the ultrasonic equipment (echograph) influences the acoustic density of imaged tissue.

Answer 58

The precision of the ultrasonic instrument does not have an effect on the quality of received images

Answer 59

The ultrasonic image, displayed on the monitor, represents the acoustic density of studied tissues.

Answer 60

Infrasound

Answer 61

Ultrasound

Answer 62

Electromagnetic waves with frequency under 20 Hz

Answer 63

Mechanical waves with frequency above 20 Hz

Answer 64

None of the above

Answer 65

The speed of blood relative to the stationary transducer (emitter and receiver) is as much great as Δf is greater

Answer 66

Blood motion does not affect Δf

Answer 67

The speed of blood relative to the stationary transducer is greater when Δf is smaller.

Answer 68

Pediatrics

Answer 69

Seismology

Answer 70

Dental medicine

Answer 71

Mechanical waves do not propagate through the surrounding tissue

Answer 72

Acoustic pressure in the surrounding tissue is greatly reduced compared tothe pressure induced in the kidney stones

Answer 73

Mechanical waves do not have negative effect on soft tissue

Answer 74

Longitudinal waves

Answer 75

Transverse waves

Answer 76

Both, longitudinal and transverse modes

Answer 77

Only when the intensity of the wave is sufficiently high for the ear to detect

Answer 78

No, that’s why they are called infra-sound

Answer 79

They can be sensed as vibrations by the tactile receptors of the skin

Answer 80

Infrasound

Answer 81

Ultrasound

Answer 82

Magnetic resonance

Answer 83

Vacuum tubes

Answer 84

Piezoelectric effect

Nächster

Physical basis of Doppler ultrasound imaging - Medical Physics - MCQs

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