describe the cathode:

negative charged electrode w/n x-ray tube

heat builds up on the anode and must be dissipated by

a rotating anode and a tungsten alloy target

what is the purpose of the rotating anode

dissipate heat effect of electrons as they hit the target

describe the x-ray tube

energy converter. receives electrical energy, converts to x-ray and heat

direct current is necessary to produce xrays, the current must flow through the xray tube

from cathode to anode without interruption

the filament circuit is used to:

boost the current to the xray transformer

rectifiers are used in the x-ray circuit to ensure that:

the current flows through the x-ray tube in a continuous direction

the purpose of the transformer is to:

increase the voltage in a step up transformer

the exposure switch must ____ and ____

terminate exposure completed, must not reexpose until switch is released

the anode rotates in order to

dissipate the heating effect of the electrons as they hit the target

describe the anode heel effect

intensity of radiation > on cathode side than anode

what is the thermionic emission?

boiling off of electrons from the filament

in x-ray technology, potential difference refers to the difference between:

the charge between the cathode and the anode of the x-ray tube

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diagnostic x-ray production

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chapter 2 lavins radiography for veterinary technicians

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Questions 36

Answers

1
describe the cathode:
coiled tungsten wire
an electrode with a positive charge
negative charged electrode w/n x-ray tube
sets sequence of events in motion to produce the x-ray exposure
2
coiled _____wire that's source of electrons during x-ray production
titanium
tungsten
platinum
thorium
3
heat builds up on the anode and must be dissipated by
a rotating anode or a thick copper stem
a long tungsten stem and a rhodium filter
a rotating anode and aluminum coil
a rotating anode and a tungsten alloy target
4
main component in the circuit that produces the x-rays.
thermionic emmision
x-ray tube
filament
cathode
5
what is the purpose of the rotating anode
provides voltage requested when kV set on control panel
sets sequence of events in motion to produce the x-ray exposure
describes how electrons interact with anode and change direction
dissipate heat effect of electrons as they hit the target
6
what temperature can anodes reach during multiple exposures?
2370 degrees F
3410 degrees F
6170 degrees F
6470 degrees F
7
physical area of target bombarded by electrons during x-ray production
focal spot bloom
line focus principle
focal spot
exposure switch
8
describe the x-ray tube
sets sequence of events in motion to produce the x-ray exposure
power generated activated xray circuit
produces electron cloud when current is applied
energy converter. receives electrical energy, converts to x-ray and heat
9
direct current is necessary to produce xrays, the current must flow through the xray tube
from transformer circuit directly to the xray tube
from the filament circuit to the anode in one direction only
from anode to cathode with interruption
from cathode to anode without interruption
10
a transformer is used to step up or step down electricity; it recieves
high voltage and low amperage
high amperage and low voltage
high wattage and low resistance
low wattage and high resistance
11
the filament circuit is used to:
increase the current to the collimator light
boost the current to the xray transformer
increase the intensity of the electron beam
send voltage to the cathode to heat it
12
rectifiers are used in the x-ray circuit to ensure that:
the current flows through the x-ray tube in a continuous direction
the voltage is maintained in the x-ray circuit
an alternating current flows through the x-ray tube
a direct current flows in the x-ray circuit
13
the rotor circuit is responsible to activate
the rotating anode
the internal rectifiers
the x-ray filamnet
the production of x-rays
14
the purpose of the transformer is to:
increase the voltage in a step up transformer
transform the voltage to enable the unit to power up
maintain the voltage and decrease the current
decrease the voltage in a step up transformer
15
describe the anode:
an electrode with a (+) charge
an electrode with no charge
an electrode with (-) charge
produces an electron cloud when current is applied
16
which type of anode is used for small animals usually mounted
direct
alternating
rotating
stationary
17
the exposure switch must ____ and ____
activate a 2 stage exposure, will not reexpose until the door is closed
terminate exposure completed, must not reexpose until switch is released
be depressed to activate exposure, will continue to expose until released
expose only correct factors set, must not reexpose until switch is released
18
how is the current in an x-ray generator labeled?
kV
seconds
Milliamperage
sV
19
coiled wire that's a source of electrons during x-ray production
cathode
x-ray tube
anode
filament
20
this part directs the electrons toward the anode
focal spot
filament
focusing cup
anode target
21
the anode rotates in order to
dissipate the heat emitted in teh production of x-rays
decrease the size of teh focal spot to form a clearer image
increase the size of teh focal spot and increase contrast
dissipate the heating effect of the electrons as they hit the target
22
x-rays produced when ____ electrons are attracted to ___ by an electromagnetic force
positive, a positive anode
negative, a positive anode
negative a negative cathode
positive, a negative anod
23
describe the anode heel effect
physical area of target bombarded by electrons
intensity of radiation < on cathode side than anode
electrons impact the anode
intensity of radiation > on cathode side than anode
24
occurs during the prod. of x-rays when projectile electron completely avoids the orbital electrons of tungsten atom
line focus princaple
thermionic emmision
bremsstrahlung
anode heel effect
25
what structure provides the voltage requested when kV is set on the control panel?
focal spot
exposure siwtch
rectifiers
autotransformer
26
what is the thermionic emission?
electrons directly impact this part to produce x-rays
intensity of radiation greater on the cathode side than on the anode side
boiling off of electrons from the filament
produces an electron cloud when current is applied
27
the thick end should always go on the ____ side
anode, right
cathode, right
anode, left
cathode, left
28
what are the two main components of the tube
rotor and stator
cathode and anode
filaments and focusing cup
evacuated glass bottle and fliament
29
what is the ratio of heat to x-rays produced during exposure?
10% heat and 90% x-rays
1% x-rays and 99% heat
10% x-rays and 90% heat
1% heat and 99% x-rays
30
the high frequency x-ray unit is ____ efficient than a/an ___ unit
less, single-phase
less, equine mobile
more, single-phase
less, three phase
31
the part through which the xrays exit the tube
focusing cup
filament
window
glass envolope
32
the cathode compromises ___ and ___
alternating and direct currents
rotating and stationary
focusing cup and filament
heel effect and focal spot
33
the cathode in the x-ray tube is a coiled ___. it is made of ______
wire, copper
wire, tungsten
tube, aluminum
tube, tungsten
34
______ anodes are portable with no rotation/sound. (dental) (fluoroscopY)
rotating
direct
stationary
alternating
35
what are the two type of anodes available
direct and alternating
rotating and stationary
b-mode and a -mode
positive or negative
36
in x-ray technology, potential difference refers to the difference between:
the charge between the cathode and the anode of the x-ray tube
voltage and the amperage in an electric circuit
the power ratings of 2 different x-ray units
technical factors used with large dogs compared with cats

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