RANDOM IMAGE PRODUCTION Flashcards
learn all of them
which term describes the same exposure to the image receptor if the same milliampere-seconds (mAs) is used, even if different milliampere (mA) and timer settings are used?
Exposure reproducibility
what is the energy conversion principle in an x-ray imaging system?
Electrical energy is converted into electromagnetic energy
which control can be used to accommodate slowly changing calibration or sensitivity of the exposure control AEC
Optical density
what occurs if the filament in the x-ray tube gets vaporized?
ARCING= vaporization of the filament causes tungsten to coat the glass,resulting in ARCING.
what is the consequence of a small amount of gas present inside an x-ray tube?
Generates more heat - a small amount of gas in the enclosure leads to the generation of more heat.
what is the mean marrow dose ?
The average radiation dose to the entire active bone marrow
which type of shielding can be manipulated to extend into the path of the beam during a radiologic procedure
shadow shielding - are mounted to the side of the collimator of the x-ray tube. It is manipulated to extend into the path of the beam and cast a shadow on the patient .
which is the minimum kvp typically found on high -kvp technique charts
100 kvp
which device senses the amount of radiation incident on the image receptor ?
Automatic exposure control
grid
reduces the scattered radiation and allows the primary radiation to pass.
three phase and high frequency generators
help to reduce the exposure time , but they do not help to sense the amount of radiation incident on the image receptor.
For which projection might gonald shielding obscure essential anatomy for both males and females
the lateral inferosuperior hip
which is the most important marker for limb projections
R and L
which of these precautions should a radiologic technologist take control occupational radiation exposure during a fluoroscopic procedure?
- use proper protective shielding 2. use proper lead curtains on the equipment 3. Step back from the table when assistance is not required
which factor when decreased would minimize size distortion recorderd in a radiographic image?
Object to image receptor distance
which devices are available in different sizes and are used for various age groups to shield male and female gonads during a radiographic examination ?
Flat contact shields
identification is absolutely vital in what type of studies?
- follow up studies 2. medicolegal cases 3. comparison studies
what determines the contrast resolution of a digital imaging system?
BIT DEPTH- determines the number of gray levels that can be displayed by a digital imaging system , thus bit depth determines the contrast resolution
which term protects a radiologic technologist from radiation
- lead aprons 2. wraparound aprons
which portion of the pixel face is sensitive to x-rays ?
FILL FACTOR- is the percentage of the pixel face that is sensitive to x-rays. the fill factor is 80 of the pixel face, with the remaining 20 percent dedicated to the reading and storage components.
which type of device does a radiologic technologist place the side of the collimator of the x-ray tube on a flexible extension arm?
shadow shield
Aperture ratio is a measure of what characteristic of liquid crystal displays ( LCDs)
image luminance - The portion of the pixel face that is available to transmit light is the aperture ratio.
which component of a radiographic imaging system measures the quantity of radiation that reaches the image receptor ?
Automatic exposure control (AEC)
which technical factor I controlled by automatic exposure control (AEC) ?
exposure time
