Radiography: Equipment Operation Flashcards
__________________ is an electric device used to convert alternating current into direct current by allowing a current to flow in only one direction.
A rectifier
Which 3 components are essential in order for X-ray tubes to function?
A vacuum-sealed glass/metal envelope, an electron source (cathode), and target material (anode)
What type of motor is used with X-ray tubes?
An induction motor
___________________ refers to the number of X-rays or the intensity of the X-ray beam.
**Radiation quantity **
An X-ray tube current is controlled through a separate circuit called the ______________.
filament circuit
What part of the collimator absorbs the X-ray beam?
Lead shutters
What type of X-ray generator features the exposure beginning at the maximum mA with the mA dropping as the anode heats?
A falling load generator
A vacuum tube with 2 electrodes, a cathode and an anode, is also called ______________ .
**a diode **
What is the main reason inherent filtration or added filtration are used?
**To decrease patient dose **
One side of an X-ray beam is stronger because some of the radiation created in the X-ray tube is absorbed by ________________ .
the anode
The console of a radiographic imaging system usually DOES or DOES NOT allow control of added filtration?
Does not
The most powerful X-ray that emerges from the X-ray tube is controlled by what setting?
kilovoltage peak (kVp)
What is directly proportional to receptor exposure?
**Milliampere seconds (mAs) **
When the primary X-ray beam passes through tissue, photons interact with the anatomy, and the beam’s energy is reduced, which is a process known as __________________ .
**attenuation **
The ratio of the number of light photons emitted by the output phosphor in an image intensifier tube to the number of X-rays striking the input phosphor is called __________________ .
**flux gain **
When using an image intensifier, the brightness gain can be calculated by ___________________ .
**multiplying the flux gain times the minification gain **
The component of an image intensifier tube that converts the photoelectrons into visible light is called _____________________ .
**the output phosphor **
In an image intensifier, the _____________________ converts visible light into a photoelectrons.
**photocathode **
In an image intensifier tube, __________________ is where electrons interact and produce light.
the output phosphor
__________________ is a characteristic of an image intensifier and appears as reduced brightness and contrast toward the periphery of the resulting image.
Vignetting
The fluoroscopic exposure rate may not exceed _________________ .
100 mGya per minute
The cathode assembly is made up of 2 primary parts, which are ________________ and _________________.
a filament and a focusing cup
The anode components of an X-ray tube rotate at a high rate per minute in order to ____________________
**dissipate heat **
The rows and columns of pixels displayed on a digital image is _____________________ .
**the matrix **
