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Radiology > Final > Flashcards

Final Flashcards

1
Q

Where does radiation exposure come from?

A

scatter radiation

x-ray tube head ?

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2
Q

X-ray are a form of

A

electromagnetic radiation

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3
Q

What is the majority of energy produced in the x-ray tube

A

heat

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4
Q

The anode consists of a

A

tungsten target

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5
Q

The cathode provides

A

electrons

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6
Q

Rotating anodes cause an increase intensity of the x-ray beam on the cathode side. This is called

A

heel effect

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7
Q

electron

A

particle that is negatively charged and travels around the center of an atom

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8
Q

frequency

A

number of cycles of the wave that pass a stationary point per second

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9
Q

wavelength

A

distance between 2 consecutive corresponding points on a wave

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9
Q

Why is it important that x-rays are created in a vacuum

A

prevent dust particles from interfering in production

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10
Q

What does milliamperage (mA) control

A

Number of electrons boiled off
degree of blackness
number of x-ray produced

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11
Q

What does kilovoltage peak control

A

penetrating power
degree of contrast
shades of gray

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12
Q

Select all the tissues that are particularly susceptible to radiation damage

A

Skin
Blood

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13
Q

The best place to wear your dosimeter badge is under you lead apron during radiograph procedures

A

False

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14
Q

What is the MPD for occupationally exposed people

A

5 REM

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15
Q

What is not part of proper protective apparel

A

lab coat

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16
Q

An overexposed film will be to light

A

False

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17
Q

Which is not a physical property of x-rays

A

x-ray travel in a wave

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18
Q

The purpose of a grid is to

A

absorb scatter and non-image forming x-rays

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19
Q

Order the density of the following tissues from the least dense (1) to the most dense (5)

A
  1. Air
  2. Fat
  3. Water/muscle
  4. Bone
  5. Metal
20
Q

As the focal film distance decreases, the intensity of the x-ray increases. This rule is called

A

inverse square law

21
Q

The grid is located between the x-ray tube and the patient

A

False

22
Q

Which is a contraindication of using barium for GI studies

A

suspected perforation of GI tract

23
Q

To produce good quality radiographs of the thorax and abdomen, you need ___ contrast

A

low

24
Q

bisecting

A

beam is projected at a right angle to an imaginary line that cuts in half the angle formed by the place of the film and the long axis of the tooth

25
Q

parallel

A

beam is projected at a right angle to the film and long axis of the tooth

26
Q

Which way should the tube head be directed. if excessive elongation occurs with dental x-rays

A

more toward the sensor

27
Q

What is the goal for dental imaging

A

get a complete image of the root

28
Q

Anechoic

A

no echo are returned to the transducer resulting in a black image

29
Q

Hyperechoic

A

echoes produced are brighter than the surrounding tissue

30
Q

Hypoechoic

A

a few echoes are detected and the area is low level gray compared with adjacent tissues

31
Q

What causes acoustic shadowing? Interaction of sound waves with …

A

Bone

32
Q

Technetium 99m used in nuclear scintigraphy has a long half life, therefore animals are usually released after 5-6 days post administration of drug.

A

false

33
Q

Ultrasound examinations of the equine primarily below the carpus/tarsus

A

False

34
Q

Depth

A

allows you to put the patient area of interest in the biggest part of the image

35
Q

Gain

A

affects the brightness of the image

36
Q

Time-gain compensation

A

allows you to change gain in the near, far or entire image

37
Q

which rang of frequencies are used for most small animal ultrasound procedures

A

2-15 mHz

38
Q

Comet tail

A

sound waves interacting with metal objects

39
Q

Distance enhancement

A

sound beam travels through a fluid-filled structure

40
Q

Reverberation

A

repeated back and forth reflection of sound waves between two highly reflective surfaces

41
Q

Which type of image receptor captures the distribution of the radioactivity of a radiopharmaceutical injection with gamma-ray camera

A

nuclear scintigraphy

42
Q

What special imaging unit is used to identify and irradiate abnormal thyroid tissues in cats

A

nuclear medicine

43
Q

Which is the most common indication form nuclear bone scan

A

lameness that cannot be localized

44
Q

Fluoroscopy produces an continuous image

A

True

45
Q

Select all the uses of fluoroscopy units

A

swallowing
heart
vascular studies

46
Q

Which of the following materials does not require special handling following injection of Technetium-99

A

Hair

47
Q

Any anesthesia machine can be used with performing an MRI

A

Falsse

48
Q

A high frequency probe produces better resolution and detail images than a low frequency probe

A

True

Radiology (7 decks)

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