Radiology Flashcards Preview

Veterinary Technician > Radiology > Flashcards

Flashcards in Radiology Deck (188)
Loading flashcards...
61

What are 10 things you can do to decrease your radiation exposure?

1. never hold the x-ray tube
2. wear film or TLD badges near the collar
3. maintain darkroom chemicals in good operating condition
4. have the x-ray machine calibrated annually
5. don't aim the x-ray beam directly at any personnel
6. use a 2.5mm aluminum filter to remove soft x-rays
7. use collimation whenever possible to decrease field size and scatter radiation
8. never let any part of the body within the primary beam
9. use mechanical restraints whenever possible (sandbags)
10. use chemical restraint whenever possible (anesthetize)

62

What is the name of the radiation monitoring device you wear?

film badge a type of dosimeter

63

What is the MPD? and who is responsible for setting dose limits?

maximum permissible dose is the maximum dose of radiation that a person may receive in a given period, NCRP national committee on radiation protection and measurements

64

The unit of absorbed dose is?

Gy gray

65

1 Gy =

100 rad

66

The quantity of energy imparted by ionizing radiations to matter per unit of mass of the matter

absorbed dose

67

The quantity obtained by multiplying the absorbed dose in tissue by the quality factor.

dose equivalent

68

The unit of dose equivalent is?

Sv sievert

69

1 Sv=

100 rem

70

What lead equivalent do gloves and gowns need to be in order to be safe?

at least 0.5mm thickness

71

How do you maintain protective gear?

aprons are hung vertically over a sound surface(not 3< cm in diameter) or laid flat when not in use, gloves are placed on vertical holders that allow air to circulate throughtout the inside, lead aprons and gloves should be inspected periodically for damage

72

Secondary radiation caused by interaction of the primary beam with objects in its path.

scatter radiation

73

The amount of scatter radiation is determined by what 4 factors?

intensity of the beam, the composition of the structure being radiographed, the kVp level, and the thickness of the patient

74

What is primary radiation?

the path that the x-rays follow as they leave the tube

75

Several important factors must be considered if an accurate reproduction is to be made:

welfare of the patient, restraint and immobilization of the patient, minimal truama to the area of interest, and the least risk of exposing those assisting with the examination to radiation

76

What instrument is used to measure the anatomic area of interest? Measurements are in what increments?

a caliper measures part thickness in centimeters

77

What are the required views?

two views of each anatomic area taken at right angles to each other minimum

78

T/F X-rays produce a radiograph

true

79

The amount of electrical energy being applied to the anode

mA milliamperage

80

The amount of electrical energy being applied to anode and cathode to accelerate the electrons from the cathode to the anode

kV kilovoltage

81

A number of x-rays traveling together through space at a rapid speed

x-ray beam

82

A visible photograph record on film produced by x-rays passing though an object

radiograph

83

A restricting device used to control the size of the primary beam

collimator

84

A decrease of x-ray intensity on the anode side of the x-ray beam caused by the anode target angle

heel effect

85

Difference in density and mass of two adjacent anatomic structures

contrast

86

The distance between the source of x-rays and the image receptor or film

source image distance (SID) formerly called FFD

87

How does energy travel?

fast moving electrons is produced at the cathode(filament) and directed to the anode->as electrons collide and interact with the atoms of the target on the anode energy is produced

88

T/F 99% is the form of roentgen radiation and 1% is a great amount of heat.

false

89

_____ is the result of the interaction of the electrons and the atoms in the target.

heat

90

What are the two electrodes found in an x-ray tube? What role do they play in the movement of the electrons?

anode and cathode, the negative charge at the cathode are attracted to the positive anode and collide producing x-rays and heat