Deck 5: The X-ray Imaging System

Question 1

Voltage across the x-ray tube is most constant with _____.

A) high frequency generators
B) single-phase, half-wave rectification
C) single-phase, full-wave rectification
D) three-phase, full-wave rectification

Answer 1

high frequency generators

Question 2

The autotransformer has _____ winding(s).

A) one
B) two
C) three
D) four

Answer 2

one

Question 3

A diode allows electrons to flow from _____.

A) anode to cathode
B) cathode to anode
C) cathode to cathode
D) anode to anode

Answer 3

cathode to anode

Question 4

The difference in the waveform between the primary and secondary sides of the high voltage transformer is _____.

A) frequency
B) velocity
C) amplitude
D) all of the above

Question 5

The first component to receive power in the x-ray circuit is the _____.

A) mA meter
B) high voltage transformer
C) rectifier
D) autotransformer

Question 6

The step-up transformer increases voltage _____ times.

A) 500-1000
B) 200-300
C) 60-120
D) 20-50

Question 7

The high voltage generator contains the high voltage transformer,the _____,and the _____.

A) autotransformer, timer
B) timer, rectifiers
C) kVp meter, filament transformer
D) filament transformer, rectifiers

Question 8

The operating console contains circuits that are _____.

A) both high voltage and low voltage
B) high voltage only
C) low voltage only
D) non-voltage

Question 9

The mAs timer is usually set to give the _____ mA at the _____ time.

A) highest, highest
B) highest, shortest
C) lowest, shortest
D) lowest, highest

Question 10

Variations in power distribution to the x-ray machine are corrected by the _____.

A) line voltage compensator
B) high voltage autotransformer
C) full-wave rectifier
D) automatic exposure control

Question 11

In modern imaging systems,the components for rectification are _____.

A) capacitor discharge generators
B) high frequency transformers
C) vacuum tubes
D) solid state semiconductors

Question 12

A step-down transformer is located in the _____ circuit.

A) tube
B) timing
C) filament
D) rectifier

Question 13

With half-wave rectification,the current flows through the x-ray tube during the _____ part of the cycle.

A) zero
B) positive or negative
C) positive
D) negative

Question 14

Thermionic emission at the filament determines the _____ across the x-ray tube during an exposure.

A) kilovoltage
B) milliamperage
C) resistance
D) magnetism

Question 15

Most mammography units operate with _____ generators.

A) capacitor discharge
B) high frequency
C) single-phase
D) three-phase

Question 16

The automatic exposure control (AEC)terminates the exposure when _____.

A) the set time is reached
B) set radiation leaves the x-ray tube
C) sufficient radiation reaches the image receptor
D) the correct mAs is reached

Question 17

The three main parts of the x-ray imaging system are the x-ray tube,_____,and _____.

A) protective barrier, tabletop
B) operating console, high voltage generator
C) rectification circuit, operating console
D) crane assembly, tabletop

Question 18

The most accurate type of timer is the _____ timer.

A) mechanical
B) electronic
C) synchronous
D) mAs

Question 19

Full-wave rectified,three-phase units provide an x-ray beam at _____ pulse(es)per second.

A) 1
B) 60
C) 120
D) 360

Question 20

The _____ circuit provides electrons for the x-ray tube current.

A) rectifier
B) autotransformer
C) high voltage
D) filament

Question 21

What is the industry standard formula for calculating high voltage generator power?

A) power = min mA (@100 kVp and 100 ms) / 100 kVp
B) power = min mA (@100 kVp and 100 ms)/100 kVp
C) power = max mA (@100 kVp and 100 ms) / 100 kVp
D) power = max mA (@100 kVp and 100 ms)/100 kVp

Question 22

The principal disadvantage of three-phase equipment is _____.

A) efficiency
B) cost
C) operation
D) beam quality

Question 23

The x-ray generator with the lowest power rating is the _____ imaging system.

A) high frequency
B) three-phase, twelve-pulse
C) three-phase, six-pulse
D) single-phase

Question 24

A single-phase waveform has _____ ripple.

A) 1%
B) 4%
C) 14%
D) 100%

Question 25

The x-ray beam generated by the circuit with the _____ voltage ripple has the _____ quantity and quality.

A) highest, lowest
B) highest, highest
C) lowest, highest
D) lowest, lowest