Ch. 5 X-Ray Equipment Flashcards
How many alterations in the direction of the current flow occur in 0.10 second in a 60 Hz AC current?
12
0.1 sec x 120 turns/1sec
At what point in the x-ray circuit is the rectification circuit located?
Between the step-up transformer and the x-ray tube
Where is the stator of the anode induction motor located?
Outside the glass envelope and outside the rotor
The exposure switch on an x-ray machine is intended to:
Initiate the exposure
The exposure switch is found between the:
Autotransformer and the timer circuit
The electrical device used to adjust the mA selection is:
A variable resistor
The time control is found between the:
- Exposure switch and the step-up transformer
- Incoming line and the step-down transformer
The mA control is found between the:
Incoming line and the exposure switch
Diagnostic x-ray range is approximately:
- 10 to 1200 mA
- 0.001 to 10 seconds
- 25 to 150 kVp
A key advantage of a curved-top radiographic table is the:
Smaller object image distance (OID)
When using AEC at 80 kVp, backup times:
Must not exceed 600 mAs
Radiographic rooms equipped with a tilting table are primarily designed for performing _______ procedures.
Fluoroscopic
All of the following are x-ray tube support systems EXCEPT:
a. C-arm
b. Floor-to-ceiling
c. Overhead suspension
d. Fluoroscopic tower
d. Fluoroscopic tower
To protect the radiographer during x-ray exposures.
The mA and kVp selections are on the low voltage side of the circiut
Which tube suspension system offers the greatest multidirectional movement?
a. Overhead tube suspension system
b. Floor-to ceiling tube suspension
c. Floor tube suspension system
d. Mobile tube suspension system
a. Overhead tube suspension system
The incoming line current is supplied:
In the form of a three phase power cycle
Nearly all types of x-ray equipment operate from an incoming line of:
210 V
When full-wave rectification is applied to three-phase current, a ____ ripple is produced.
Voltage
A three-phase, rectified current produces a voltage ripple of ____ pulses per Hz.
6
Ancillary equipment for tilting tables includes:
- A footboard
- Handgrips
- Shoulder supports
All of the following are desired features of radiographic tables EXCEPT:
a. Variable height to improve patient safety
b. Floating table tops to enhance patient positioning
c. Low abrasion surface to lessen patient slippage as they transfer
d. Carbon fiber material to reduce absorption of x-ray energy
c. Low abrasion surface to lessen patient slippage as they transfer
High frequency generators:
- Use invertors to increase pulse frequency
- Produce similar output to three-phase with a single phase source
- Achieve peak kVp faster than single or three phase generators
Falling load generators:
- Permit higher mA exposures for short exposure times
- Permit the mA to fall as exposure time increases
- Are designed to use the highest allowable mA
Radiographing a thin body part using automatic exposure control (AEC):
May produce inconsistent images due to AEC timer errors
Automatic exposure control (AEC) technology determines:
Exposure time
Present day AEC technology utilized:
- Ionization chamber technology
- Minimum reaction times as short as 1 ms
- A pre-detector AEC chamber position
When compared to battery-powered portable radiographic units, capacitor discharge mobile units:
Have a tendency to produce leakage exposure after exposure termination
When compared to single phase electrical current, three phase power:
- Permits shorter exposures
- Produces 360 pulses per second
- Produces less voltage ripple
