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FCLV,RRT(MIDTERM) > DADDY > Flashcards

DADDY Flashcards

1
Q

dThree Principal Parts of X-ray Imaging System

A

X-ray Tube, Operating Console & High Voltage Generator

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2
Q

It is attached to an overhead movable crane assembly

A

X-ray Tube

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3
Q

LOCATIONOF X-RAY TUBE

A

examination room

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4
Q

Fluoroscopic X-ray Tube is located____

A

under the examination table

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5
Q

Examination Table must be ____

A

transparent to x-rays as possible

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6
Q

composition of examination table

A

carbon fiber

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7
Q

ratio of Fluoroscopic Table Tilt

A

90/30
90 degree to foot side
30 to head side

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8
Q

housed in an equipment cabinet positioned against a wall

A

High Voltage Generator

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9
Q

High Voltage Generator is always clodes to the

A

x-ray tube

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10
Q

Most familiar to the radiologic technologist

A

Operating Console

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11
Q

It is used to control the x-ray tube current & voltage applied to the x-ray tube

A

Operating Console

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12
Q

It provides control of line compensation, kVp, mA & exposure time

A

Operating Console

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13
Q

The number of x-rays

A

Radiation Quantity

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14
Q

The intensity of the x-ray beam

A

Radiation Quantity

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15
Q

Radiation Quantity units

A

mR or mR/mAs

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16
Q

The penetrability of the x-ray beam

A

radiation quality

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17
Q

radiation quality is expressed in

A

kvp or hvl

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18
Q

It measures the voltage provided to the x-ray imaging system

A

Line Compensator

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19
Q

It controls the kVp

A

Autotransformer

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20
Q

It consists of only one winding of wire & one core

A

Autotransformer

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21
Q

supplies a precise voltage to the filament circuit & high-voltage circuit

A

Autotransformer

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22
Q

location of autotransformer

A

operating console

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23
Q

Autotransformer Law

A

states that the voltage receive & provide by the transformer is directly proportional to the number of turns

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24
Q

formula of autotransformer law

A

Formula: Vs/Vp = Ns/Np

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25
It conducts the input power to the autotransformer
Primary Connection
26
Adjustment of Kilovoltage Peak (kVp)
Major & minor kVp
27
It reads voltage (not kVp)
kVp Meter
28
It determines the quality of the x-ray beam
kVp
29
Location: output terminals of the autotransformer
kvp meter
30
It allows the voltage to be monitored before an exposure
Prereading kVp Meter
31
It is measured in milliamperes
X-ray Tube Current
32
It determines the number of electrons emitted by the filament
Filament Temperature
33
It controls the filament temperature
Filament Current
34
It is measured in amperes
Filament Current
35
Filament Current range from___ to __
3-6 A
36
It controls x-ray tube current
Filament Circuit
37
A phenomenon of the space charge that makes it difficult for subsequent electrons to be emitted by the filament because of electrostatic repulsion
Space Charge Effect
38
Electron cloud near the filament
Space Charge
39
The release of electrons from a heated filament
Thermionic Emission
40
It is used to reduce the voltage to a value that corresponds to the selected milliamperage
Precision Resistor
41
Three Main Section of X-ray Imaging System
X-ray tube, Operating Console & High-Voltage
42
Power Rating (kW) formula for three-phase and high frequenc
(mA x kVp)/1000
43
Power Rating (kW) formula for single-phase
(0.7)(mA x kVp)/1000
44
Fewer low-energy projectile electrons pass from cathode to anode
Greater radiation quality
45
Electron cloud near the filament
Space Charge
46
The release of electrons from a heated filament
Thermionic Emission
47
It is used to reduce the voltage to a value that corresponds to the selected milliamperage
Precision Resistor
48
The product of x-ray tube current (mA) & exposure time (s)
mAs
49
It monitors the x-ray tube current
mA Meter
50
Filament Transformer  Full Name
Filament Heating Isolation Step-down Transformer
51
Primary windings
o Thin copper o Current: 0.5-1 A o Voltage: 150 V
52
Secondary windings:
o Thick o Current: 5-8 A o Voltage: 12 V
53
It terminates an exposure after a prescribed time (6 s)
Guard Timer
54
Four Types of Timing Circuits
Synchronous Timer, Electronic Timer, mAs Timer & Automatic Exposure Control
55
A precision device designed to drive a shaft at precisely 60 revolution per second  It cannot be used for serial exposures
Synchronous Timer
56
Most sophisticated, most complicated & most accurate (as small as 1 ms)
Electronic Timer
57
It is used to check timer accuracy (as short as 1 ms)
Solid-state Detectors
58
Terminates exposure when desired mAs value is attained
mAs Timer
59
A device that measure the quantity of radiation that reaches the image receptor
Automatic Exposure Control (AEC)
60
It increases the output voltage from the autotransformer to the kVp necessary for x-ray production
High Voltage Generator
61
Three Primary Parts of high voltage generator
High Voltage Transformer, Filament Transformer & Rectifiers
62
A step-up transformer
High Voltage Transformer
63
 It ensures that electrons flow from cathode to anode only
Voltage Rectification
64
The process of converting alternating current (AC) to direct current (DC)
Rectification
65
An electronic device that allows current flow in only one direction
Rectifier
66
Have loosely bound electrons (free to move)  Have spaces called holes (no electrons)
P-type Semiconductor
67
The voltage is not allowed to swing negatively during the negative half of its cycle
Half-Wave Rectification
67
It produces a nearly constant potential voltage waveform
High Frequency Generator
68
The voltage impressed across the x-ray tube is nearly constant  6 pulses/1/60 second
Three-Phase Power
68
The negative half-cycle corresponding to the inverse voltage is reverse
Full-Wave Rectification
68
Tube voltage falls during exposure  Approximately 1 kV/mAs
Capacitor Discharge Generator

FCLV,RRT(MIDTERM) (14 decks)

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