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exposures > review of all tests > Flashcards

review of all tests Flashcards

1
Q

the physical area of a rotating anode focal track, affected by the cathode electron beam is the

A

actual focal spot

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2
Q

the two types of anodes

A

rotating, stationary

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3
Q

what type of anode is typically used in dental radiography

A

stationary

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4
Q

what type of anode is best at dissipating heat

A

rotating

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5
Q

as the actual focal spot size increases, the effective focal spot size

A

increases

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6
Q

as the angle of the anode increases and the incident electron beam size remains the same, the effective focal spot size

A

increases

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7
Q

the area of the focal spot that is projected out of the tube toward the object being radiographed is the

A

effective focal spot

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8
Q

the exact point on the anode where the x ray beam is created is called the

A

focal spot

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9
Q

the actual focal spot is controlled by the

A

length of the filament

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10
Q

the most common range of diagnostic radiography target angle is between ___ degrees

A

12-17

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11
Q

in order to control motion when taking a radiograph, what focal spot size should be chosen so a lower time can be utilized

A

large

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12
Q

When radiographing a wedge - shaped anatomical structure such as a femur or foot the thicker portion of the anatomy should be positioned

A

under the cathode end of the tube

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13
Q

which theory states that when tube angles are less than 45 degrees , the effective focal spot is smaller than the actual focal spot

A

line focus principle

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14
Q

what is the percentage of heat produced in the production of x-rays

A

99%

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15
Q

the factors that directly affect x ray quality are

A

kVp & beam filtration

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16
Q

The factors that directly affect x-ray quantity are

A

mA, time, filtration

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17
Q

The product of the x-ray tube current and exposure time is equal to

A

x-ray beam quantity

18
Q

as the mAs doubles, the number of electrons flowing from cathode to anode

A

increase times 2

19
Q

mAs doesn’t directly affect

A

beam quality

20
Q

3 prime factors that are under the direct control of the radiographer

A

kVp, mAs, distance

21
Q

is how light or dark an image appears on the computer monitor

A

brightness

22
Q

size bloom can be described as

A

an increase in the focal spot size

23
Q

When a machine is described as “dual focus” this mean that

A

there are two filament lengths

24
Q

when performing exams where a heavy heat load will be used what focal spot size should be chosen

A

large

25
Q

which focal spot size should be used on an extremity exam, such as a hand

A

small

26
Q

penumbra or “ghosting of an image is a result of

A

off focus radiation

27
Q

The exposure of the beam should remain unchanged as long as the intensity and duration of the x-ray exposure remain unchanged

A

the reciprocity law

28
Q

increasing the KVP for an exposure will

A

cause an increase in the speed at which the electrons travel from cathode to anode

29
Q

if the mAs of a radiograph is increased from 10 to 20 the resulting radiograph will exhibit

A

increased film density

30
Q

The relationship between mAs and exposure is

A

directly proportional

31
Q

Kilovoltage is the primary controlling factor of

A

photon penetrability

32
Q

the anode heel effect will be seen mostly with ____ films at ___ distances

A

large, short

33
Q

the variation in beam intensity from anode to cathode is __%

A

45

34
Q

x ray beam penetrability is primarily controlled by

A

kVp

35
Q

after completing an upright abdomen radiograph using a manual technique, you notice some degree of motion artifact on the final image, to improve the repeat image results your best option would be to? 

A

Maintain the mAs but increase the mA and reduce the time

36
Q

The reason for the anode heal effect is 

A

The anode absorbs a portion of the beam

37
Q

An anode with a small effective and actual focal spot will improve

A

detail

38
Q

what formula should be utilized to compensate for changes in intensity

A

inverse square law

39
Q

the length of the exposure time for a radiograph is used primarily to control

A

motion

40
Q

an increase in kVp by 15% will cause an approximate ___ in exposure

A

doubling

exposures (6 decks)

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