Imaging Equipment and Operation Flashcards
What is the primary purpose of the backup time in an automatic exposure control (AEC) system?
to protect the tube from overheating and the patient from overexposure
What plays a major role in the functioning of scintillation detector equipment?
release of electrons by photoemission
Why is it necessary to evaluate the filtration of a radiographic imaging system?
to ensure patient safety
How frequently should evaluation of filtration in a radiographic imaging system be completed?
annually
Most electric exposure timers are controlled by which device?
microprocessor
The spatial resolution of a radiographic imaging system is determined principally by what characteristic of the x-ray tube?
focal-spot size
Which is the reason for alloying the tungsten with rhenium in x-ray equipment?
to withstand the stresses of high-speed rotation and to withstand the effect of repetitive thermal expansion
In what part of the equipment does the operator perform the selection of exposure factors such as milliampere-seconds (mAs) and kilovoltage peak (kVp)?
control console
Which component of the x-ray equipment is used to decrease the entrance skin dose of radiation?
collimators
Modern x-ray generators have anatomic programmers that can store a wide range of radiographic techniques. To use this type of equipment with the technique automatically set, what factor does the radiographer select?
body part
Which devices monitor the radiation exposure of personnel operating radiographic imaging systems?
film badges, thermoluminescence dosimetry, and optically stimulated luminescence
Which external agency regulates the operations of a radiology department?
Nuclear Regulatory Commission (NCR)
Which circuit element allows electrons to flow only in one direction?
diode
Which material is used in the manufacturing of solid-state rectifiers in an x-ray circuit?
silicon
What are the primary components of the x-ray tube?
anode and cathode
What is leakage radiation?
radiation emitted by the x-ray tube through the tube housing
What component supports and permits the x-ray tube to be moved in different directions?
tube stand or overhead tube crane assembly
What is most likely to result if the x-ray tube is not centered to the table?
grid cutoff artifacts
What should a radiographer do to prevent radiographic fog?
limit the size and shape of the primary beam
The electrical energy supplied to the X-ray tube is converted into what form of energy for the production of x-rays?
electromagnetic energy
