X-Ray Circuit
The x-ray tube is a DC electrical device, while the transformers that power it are AC devices. An arrangement of diodes between the two converts the AC voltage waveform into a pulsed DC output. The process of converting an electrical signal from AC into DC is called?
Rectification
The primary parts of the cathode include the,
1. Focal Track
2. Filament
3. Focusing cup
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3
C. 2 and 3
When using the smaller field in a dual-field image intensifier,
1. A smaller patient is magnified
2. The image is magnified
3. The image is less bright
A. 1 only
B. 1 and 3
C. 2 and 3 only
D. 1, 2, and 3
D. 1, 2, and 3
A device contained within many CR readers that functions to convert light energy released by the PSP into electrical energy is called a:
A. Transilluminator
B. Photomultiplier tube
C. Light gate
D. Penetrometer
B. Photomultiplier
To be more efficiently by the x-ray tube, alternating current is changed to unidirectional current by the
A. filament transformer
B. autotransformer
C. high-voltage transformer
D. rectifiers
D. rectifiers
All of the following x-ray circuit devices are located between the incoming power supply and the primary coil of the high-voltage transformer except
A. the circuit breaker
B. the kilovoltage selector
C. the rectifiers
D. the autotransformer
C. the rectifiers
What are the 2 main components of the x-ray tube?
1. Anode 2. Stator
3. Cathode 4. Rotor
A. 3 and 4
B. 2 and 4
C. 1 and 3
D. 1, 2, and 4
C. 1 and 3
Digital Fluoroscopy units use which of the following devices in lieu of television camera tube?
A. Charged-Coupled-Device
B. Photometer
C. Photomultiplier tube
D. Light gate
A. Charged-Coupled-Device
Characteristics of DR imaging include,
1. Solid state detector receptor plates
2. A direct-capture imaging system
3. Immediate image display
A. 1 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2, and 3
D. 1, 2, and 3
The long axis of the laser beam moving transversely back and forth across the image plate in CR reader is called the
A. scan/translation mode
B. zig-zag scan mode
C. slow scan direction
D. fast scan direction
D. fast scan direction
To be used more efficiently by the x-ray tube, alternating current is changed to unidirectional current by the
A. filament transformer
B. autotransformer
C. high-voltage transformer
D. rectifiers
D. rectifiers
Which part of an induction motor is located outside the x-ray tube glass envelope?
A. Filament
B. Focusing Cup
C. Stator
D. Rotor
C. Stator
The radiographic imaging system that uses a flat-panel detector is
A. Film emulsion system
B. Computed radiography
C. Direct digital Radiography
D. Fluoroscopy
C. Direct digital Radiography
During CR imaging, the latent image present on the PSP is changed to a digital signal by the
A. PSP
B. Scanner-reader
C. ADC
D. helium-neon laser
C. ADC
B. Image plate transport mechanism
C. Thin-film transistor
D. Analog-to-digital converter
C. Thin-film transistor
Which portion of the X-ray tube is used by an induction motor?
A. Filament
B. Focusing cup
C. Rotor
D. Housing
C. Rotor
One advantage of a battery powered mobile radiographic unit is,
A. it requires less kilovoltage to penetrate the anatomical part of interest
B. It produces radiographic images of much better image quality
C. It is much lighter than other mobile units
D. Electrical power is available to drive itself
D. Electrical power is available to drive itself
The purpose of magnification fluoroscopy is to
A. Enhance the image in order to facilitate diagnostic interpretation
B. Decrease patient dosage
C. Decrease fluoroscopy time
D. Increase efficiency of X-ray production
A. Enhance the image in order to facilitate diagnostic interpretation
Which of the following best describes the device used to collect light emitted by storage plate phosphors
A. Photoelectric effect
B. Photoelectron
C. Photodetector
D. Photon
C. Photodetector
Which of the following systems function to compensate for changing patient thickness during a fluoroscopic procedure
A. Automatic brightness control
B. Minification gain
C. Automatic resolution contrast
D. Flux gain
A. Automatic brightness control
Which of the following is/are components of the secondary, or high voltage side of the X-ray circuit?
1. Rectification system
2. Autotransformer
3. KV meter
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3
A. 1 only
A backup timer for the AEC serves to
1. protect the patient from overexposure
2. protect the x-ray tube from excessive heat
3. adjust image contrast
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2, and 3
B. 1 and 2 only
All of the following are advantages of digital fluroscopic imaging systems, except
A. Post-processing capability to enhance image contrast
B. Increased image acquisition speed
C. No need for pulsed or continuous radiation exposure
D. Higher milliamperage settings can be used
C. No need for pulsed or continuous radiation exposure
A fill factor of 80% in direct or indirect digital radiography means that
A. 20% of the pixel area is occupied by the detector electronics, with 80% representing the sensing area
B. 80% of the pixel area is occupied by the detector electronics, with 20% representing the sensing area
C. The saturation level will be unacceptable
D. Only 20% of the image will be captured
A. 20% of the pixel area is occupied by the detector electronics, with 80% representing the sensing area
Fluorescent light is collected from the image intensifier output phosphor and converte to an electronic video signal by the
1. Tv camera tube
2. CCD
3. coaxial cable
A. 1 only
B 1 and 2 only
C. 2 and 3
D. 1, 2, and 3
B 1 and 2 only