LMRT State Review Questions and Revised
Answers – Verified 2025/2026
1. indicator number: how much radiation was absorbed into the phosphors
2. image stitching: stitching together multiple images - useful for scoliosis studies of the spine, long bone studies or
angiographic imaging of peripheral vasculature. - to view as a single image.
3. image annotation: allow the technologist to inset preset text or manual text on the image
4. contrast resolution (digital): Ability to distinguish anatomic structures having similar subject contrast
5. spatial resolution: Refers to the amount of detail present in any image.Phosphor layer thicḳness and pixel size
determines resolution in CR.
6. pixel: A single square within a matrix
7. matrix: a series of very small boxes that form a digital image
8. direct conversion: one step process in DR where flat panel detectors convert the x-ray energy directly to an electric
signal using an amorphous selenium detector for immediate viewing
9. charged coupled device: component which light enters and is converted into video or electronic signal
10. thin film transistor: used to read charges collected during an exposure
11. photodiode: A silicon solid state device sensitive to light. Converts light into an electrical signal.
1/
10
, 12. scintillator: Amorphous silicon requires a such as cesium iodide or a rare earth intensifying screen
composed of gadolinum and lanthanum with oxysulfides. This also converts x-rays to visible light.
13. flat panel detector: a type of digital detector employing amorphous silicon or selenium detector material, bonded
with thin-film transistor technology for digital image creation and amplification
14. density: It is the degree of blacḳening of a radiograph resulting from radiation exposure and processing and one of the
two photographic properties that comprise visibility of detail.
15. automatic exposure controll: a device that measures the quantity of radiation that reaches the image receptor
and automatically terminates the exposure when the image receptor has received the required radiation intensity
16. high frequency generator: , What uses AC and DC power converters to change the incoming line from 60Hz to
6000Hz?
17. three phase generator: ...
18. single phase generator: produce a pulsating current that alternates from positive to negative and are power by a
single source of ac
19. diode: A device that permits current to flow through it in only one direction
20. rectification: The process of converting AC to DC.
21. filament circuit: low-voltage circuit; uses 3-5 volts, regulates the flow of electrical current to the filament of the x-ray
2/
10
Answers – Verified 2025/2026
1. indicator number: how much radiation was absorbed into the phosphors
2. image stitching: stitching together multiple images - useful for scoliosis studies of the spine, long bone studies or
angiographic imaging of peripheral vasculature. - to view as a single image.
3. image annotation: allow the technologist to inset preset text or manual text on the image
4. contrast resolution (digital): Ability to distinguish anatomic structures having similar subject contrast
5. spatial resolution: Refers to the amount of detail present in any image.Phosphor layer thicḳness and pixel size
determines resolution in CR.
6. pixel: A single square within a matrix
7. matrix: a series of very small boxes that form a digital image
8. direct conversion: one step process in DR where flat panel detectors convert the x-ray energy directly to an electric
signal using an amorphous selenium detector for immediate viewing
9. charged coupled device: component which light enters and is converted into video or electronic signal
10. thin film transistor: used to read charges collected during an exposure
11. photodiode: A silicon solid state device sensitive to light. Converts light into an electrical signal.
1/
10
, 12. scintillator: Amorphous silicon requires a such as cesium iodide or a rare earth intensifying screen
composed of gadolinum and lanthanum with oxysulfides. This also converts x-rays to visible light.
13. flat panel detector: a type of digital detector employing amorphous silicon or selenium detector material, bonded
with thin-film transistor technology for digital image creation and amplification
14. density: It is the degree of blacḳening of a radiograph resulting from radiation exposure and processing and one of the
two photographic properties that comprise visibility of detail.
15. automatic exposure controll: a device that measures the quantity of radiation that reaches the image receptor
and automatically terminates the exposure when the image receptor has received the required radiation intensity
16. high frequency generator: , What uses AC and DC power converters to change the incoming line from 60Hz to
6000Hz?
17. three phase generator: ...
18. single phase generator: produce a pulsating current that alternates from positive to negative and are power by a
single source of ac
19. diode: A device that permits current to flow through it in only one direction
20. rectification: The process of converting AC to DC.
21. filament circuit: low-voltage circuit; uses 3-5 volts, regulates the flow of electrical current to the filament of the x-ray
2/
10
