Imaging tissues with lower atomic numbers results in
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decreased attenuation
Which of the following occurs first during x-ray production?
a.
Kilovoltage is applied to anode and cathode.
b.
Voltage is transformed to kilovoltage.
c.
Thermionic emission.
d.
Current passes through the rheostat.
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, Current passes through the rheostat.
Transmission refers to
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x-rays leaving the patient that did not interact with atoms
Compton scattering typically occurs with x-ray photons in the energy range of
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20-40 keV-Most x-ray photons that produce Compton interactions range
from 20 to 40 keV
A low-kilovoltage x-ray beam results in
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increased attenuation-A low kVp produces a low-energy beam that is more
likely to be absorbed or scattered, increasing attenuation.
Except for the K shell, the maximum number of electrons that can be in the outermost
shell of an atom is
a.
4
,b.
8
c.
32
d.
16
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8-With the exception of the K shell, no more than 8 electrons can be in the
atom's outermost shell. This is called the octet rule.
If an atom has 15 electrons, which will be the outermost shell?
a.
"O"
b.
"L"
c.
"N"
d.
"M"
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"M"-With 15 electrons, 2 will fill the K shell, 8 will fill the L shell, and 5 will fill
the M shell.
Which of the following is an example of an image receptor?
a.
Film-screen.
b.
Digital.
c.
, Absorption.
d.
A and B.
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A and B.-Film-screen and digital are types of image receptors
How many heat units are produced with an exposure using a single phase x-ray unit,
75 kVp, and 50 mAs?
a.
5,063 HU.
b.
5,288 HU.
c.
5,438 HU.
d.
3,750 HU.
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3,750 -Because mAs is the product of mA and time, the heat units for this
single-phase unit (correction factor of 1) is 1 ´ 75 ´ 50, or 3,750 HU.
The autotransformer is found on the
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primary circuit-The autotransformer is found on the primary circuit.
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decreased attenuation
Which of the following occurs first during x-ray production?
a.
Kilovoltage is applied to anode and cathode.
b.
Voltage is transformed to kilovoltage.
c.
Thermionic emission.
d.
Current passes through the rheostat.
Give this one a try later!
, Current passes through the rheostat.
Transmission refers to
Give this one a try later!
x-rays leaving the patient that did not interact with atoms
Compton scattering typically occurs with x-ray photons in the energy range of
Give this one a try later!
20-40 keV-Most x-ray photons that produce Compton interactions range
from 20 to 40 keV
A low-kilovoltage x-ray beam results in
Give this one a try later!
increased attenuation-A low kVp produces a low-energy beam that is more
likely to be absorbed or scattered, increasing attenuation.
Except for the K shell, the maximum number of electrons that can be in the outermost
shell of an atom is
a.
4
,b.
8
c.
32
d.
16
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8-With the exception of the K shell, no more than 8 electrons can be in the
atom's outermost shell. This is called the octet rule.
If an atom has 15 electrons, which will be the outermost shell?
a.
"O"
b.
"L"
c.
"N"
d.
"M"
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"M"-With 15 electrons, 2 will fill the K shell, 8 will fill the L shell, and 5 will fill
the M shell.
Which of the following is an example of an image receptor?
a.
Film-screen.
b.
Digital.
c.
, Absorption.
d.
A and B.
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A and B.-Film-screen and digital are types of image receptors
How many heat units are produced with an exposure using a single phase x-ray unit,
75 kVp, and 50 mAs?
a.
5,063 HU.
b.
5,288 HU.
c.
5,438 HU.
d.
3,750 HU.
Give this one a try later!
3,750 -Because mAs is the product of mA and time, the heat units for this
single-phase unit (correction factor of 1) is 1 ´ 75 ´ 50, or 3,750 HU.
The autotransformer is found on the
Give this one a try later!
primary circuit-The autotransformer is found on the primary circuit.
