Deck 5: The X-ray Imaging System

Question 1

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

Answer 1

sufficient radiation reaches the image receptor

Question 2

The most accurate type of timer is the ________ timer.

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

Answer 2

electronic

Question 3

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

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

Answer 3

filament

Question 4

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 5

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 6

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 7

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 8

Most mammography units operate with ___________ generators.

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

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

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

Question 11

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 12

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 13

The step-up transformer increases voltage _________ times.

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

Question 14

A diode allows electrons to flow from ___________.

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

Question 15

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 16

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 17

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

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

Question 18

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

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

Question 19

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 20

The autotransformer has _____ winding(s).

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

Question 21

The principal disadvantage of three-phase equipment is ______.

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

Question 22

A single-phase waveform has _____ ripple.

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

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

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 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