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問題一覧
1
The penetrating power of the x-ray beam is controlled by varying the:
peak kilovoltage (kVp)
2
The current, or volume, of x-ray production is measured in units of
milliamperage (mA)
3
An x-ray exposure is made using the following factors: 200 mA, 0.02 seconds, 80 kVp, 40 inches SID. The value of the mad for this exposure is
4.
4
A dual-focus x-ray tube has: 1. Two filaments 2. Two focal spot sizes 3. Two anodes
1 and 2
5
What is the standard rotation speed of the x-ray tube’s anode?
3,600 RPM
6
The rate of current flow across the x-ray tube is measured in
mA
7
Label the following image
electron stream size, actual focal spot size, effective focal spot size
8
The device for removing long-wavelength radiation from the primary x-ray beam is the
filter
9
What is the effect on the x-ray beam of the kVp is increased?
results in low contrast
10
An electron cloud surrounding the filament of the cathode is referred to as a:
space charge
11
Of what material of target/anode made?
Tungsten
12
If the x-ray tube had 0.5 mm AL equiv inherent filtration , and the collimator provides an additional 1.25 mm AL equiv, how much additional filtration must be added to meet minimum safety requirements?
0.75 mm AI equiv
13
Free electrons for x-ray production come from the
filament
14
What is the % of characteristic radiation that produced below 70 kVp?
0%
15
X-ray equipments that are able to produce 70 kVp or more is required to have total filtration of at least:
2.5 mm Al equiv
16
The creation of the space charge in the x-ray tube produces
thermionic emission
17
More than 99% of the energy of the electron stream is converted into
heat
18
Image sharpness is determined by
the size of the effective focal spot
19
The unit used to indicate the total quantity of x-ray exposure is
milliampere-seconds (mAs)
20
Above 70 kVp, what % of photons is created by bremsstrahlung radiation?
85%
21
The mA or mAs used for an exposure determines
quantity of x-ray production
22
What are the two rotation speeds for the anode?
3,600 and 10,000 rpm
23
The degree of angulation of the z-ray tube target (anode) will determine the
difference between the actual focal spot and effective focal spot
24
Is the anode side of the x-ray positive or negative?
positive
25
The high speed rotation (10,000 rpm) of the anode enables
greater dissipation of heat from high technical factors
26
The power and speed of the electrons inside the x-ray tube and the energy of the x-rays that emerge are controlled by the
kilovoltage (kVP)
27
To take advantage of the anode heel effect when making a radiograph of the femur in recumbent Anteroposterior on a 14 x17 inch image receptor (IR) at a 40 inch SID, the patient should be placed so that the
head is toward the cathode end of the tube
28
Name the tree components that contribute to inherent filtration.
glass of tube, surrounding oil of tube, and filtration from the mirror
29
What is the difference in radiation intensity between the anode and cathode end of the x-ray beam when a 14-17 inch IR is used at a 40 inch SID
45%
30
Doubling the mA will result in: 1. Increased patient dose 2. Twice as many photons in the x-ray beam 3. Increased radiographic density
1,2, and 3
31
The degree of angulation of the x-ray tube target will determine the
size of the actual and effective focal spot
32
The anode heel effect is a phenomenon of x-ray production that results in
uneven distribution of radiation within the x-ray field
33
Roentgen discovered x-rays while working with a(n) ____ tube
Crookes
34
The purpose of rotating the anode of the x-ray tube is to:
increase the heat capacity of the anode
35
Characteristic radiation is not produced below which kVp level?
70 kVp
36
How is the volume or the intensity of x-rays affected by the heel effect?
The intensity of the x-ray beam is least toward the anode end of the field
37
What type of radiation production makes up the greatest portion of the x-ray beam, bremsstrahlung or characteristic?
bremsstrahlung
38
What type of motor is used to turn the anode inside the x-ray tube?
an electromagnetic induction motor
39
When electrons in the outer most orbital shells move so far from the nucleus that they are no longer held in orbit but are flung out the atom.
thermionic emission
40
What is the term used to describe the heating of an element to a hot temperature and the expanding of the electrons in the atom?
Thermionic emission
41
If a patient has a body part that has a very thick portion and a very thin portion, which aspect of the x-ray tube should be placed over the thinnest area?
the anode end of the tube
42
What is added to the port to remove the king-wavelength radiation?
Aluminum filter
43
The primary purpose of filtration is to
reduce patient dose
44
The majority of photons in the x-ray beam are created by which process?
Bremsstrahlung radiation
45
Of what material is the filament made?
Tungsten
46
When is the large focal spot used?
To dissipate the heat of large exposures
47
What is the name of the radiation produced when an incoming electron into the anode is suddenly braked and deviated?
Bremsstrahlung radiation
48
Is the cathode side of the x-ray tube positive or negative?
negative
49
The amount of detail seen in an x-ray image is referred to as
spatial resolution
50
How much target is needed in a general purpose tube?
12 degrees
51
Label the following image
tungsten target, heated tungsten filament, evacuated Pyrex envelope, cathode, and anode