GXMO Exam Questions and Answers 100%
Solved
Safelight A. : Incandescent lamp with a color filter that provides sufficient illumination in
the darkroom while ensuring that the film remains unexposed.
i. A 15-W bulb should be no closer than 1.5 m (5 ft) from the work surface.
ii. With blue-sensitive film, an amber filter is used.
iii. For blue and green-sensitive film, a red filter is used
Scheduled maintenance i. routine procedures that are performed usually weekly or
monthly.
Preventive maintenance planned program of parts replacement at regular intervals
Nonscheduled maintenance a system failure that requires repair
,Sensitometry A. : a sensitometry strip should be passed through the processor, and fog,
speed, and contrast then should be measured and recorded properly.
Digital imaging any imaging acquisition process that produces an electronic image that
can be viewed and manipulated on a computer
Analog A. a device or system that captures or measures a continuously changing signal. A
digital image begins as an analog signal.
Analog signal wave A. recorded or used in its original form1. Ex: a watch with hands that
move continuously.
Analog image the image that is placed on a piece of radiographic film
Binary code/number system i. If the transistor circuit is closed and current passes through,
it is assigned a value of 1. If no current passes because the circuit is open, it is assigned a value
of "0"
Analog to Digital Conversion (ADC) accepts the analog signal, and digitizes it
,Digitizing the signal a numerical value is assigned to each light photon. The emitted light
is converted from the storage phosphor into an electrical signal. The electrical signal is sampled
and digitized to represent a specific location within the image matrix and displays a specific
brightness
Pixel bit depth i. The number of bits within a pixel
Spatial resolution or spatial frequency resolution A. ability to image small objects that
have high subject contrast.
i. Detail of the image measured in line pairs per millimeter (lp/mm).
Spatial resolution = field of view ÷ matrix
Sharpness also controlled by focal spot size, screen and/or film speed, and object-image
distance (OID).
, Digital radiography can also be controlled for sharpness by adjusting processing
parameters such as edge enhancement
Computed Radiography (CR) also known as Photostimulable phosphor (PSP) image
capture. Uses storage phosphor plates to produce projection images
PSP cassette i. Made of a durable lightweight plastic material.
ii. The IP is backed by a thin sheet of aluminum or lead that absorbs backscatter x-ray photons.
iii. Contains an antistatic material (usually felt) to protect against static electricity buildup, dust
collection, and mechanical damage to the IP.
PSP screen speed i. PSP screens do not have the speed limitations found in film/screen
systems and can be used over a wide latitude of exposure ranges.
ii. Example: if the relative speed of a film/screen system is 200, then a PSP screen could cover
any speed from 20 to 2000.
Protective layer : a clear plastic
Solved
Safelight A. : Incandescent lamp with a color filter that provides sufficient illumination in
the darkroom while ensuring that the film remains unexposed.
i. A 15-W bulb should be no closer than 1.5 m (5 ft) from the work surface.
ii. With blue-sensitive film, an amber filter is used.
iii. For blue and green-sensitive film, a red filter is used
Scheduled maintenance i. routine procedures that are performed usually weekly or
monthly.
Preventive maintenance planned program of parts replacement at regular intervals
Nonscheduled maintenance a system failure that requires repair
,Sensitometry A. : a sensitometry strip should be passed through the processor, and fog,
speed, and contrast then should be measured and recorded properly.
Digital imaging any imaging acquisition process that produces an electronic image that
can be viewed and manipulated on a computer
Analog A. a device or system that captures or measures a continuously changing signal. A
digital image begins as an analog signal.
Analog signal wave A. recorded or used in its original form1. Ex: a watch with hands that
move continuously.
Analog image the image that is placed on a piece of radiographic film
Binary code/number system i. If the transistor circuit is closed and current passes through,
it is assigned a value of 1. If no current passes because the circuit is open, it is assigned a value
of "0"
Analog to Digital Conversion (ADC) accepts the analog signal, and digitizes it
,Digitizing the signal a numerical value is assigned to each light photon. The emitted light
is converted from the storage phosphor into an electrical signal. The electrical signal is sampled
and digitized to represent a specific location within the image matrix and displays a specific
brightness
Pixel bit depth i. The number of bits within a pixel
Spatial resolution or spatial frequency resolution A. ability to image small objects that
have high subject contrast.
i. Detail of the image measured in line pairs per millimeter (lp/mm).
Spatial resolution = field of view ÷ matrix
Sharpness also controlled by focal spot size, screen and/or film speed, and object-image
distance (OID).
, Digital radiography can also be controlled for sharpness by adjusting processing
parameters such as edge enhancement
Computed Radiography (CR) also known as Photostimulable phosphor (PSP) image
capture. Uses storage phosphor plates to produce projection images
PSP cassette i. Made of a durable lightweight plastic material.
ii. The IP is backed by a thin sheet of aluminum or lead that absorbs backscatter x-ray photons.
iii. Contains an antistatic material (usually felt) to protect against static electricity buildup, dust
collection, and mechanical damage to the IP.
PSP screen speed i. PSP screens do not have the speed limitations found in film/screen
systems and can be used over a wide latitude of exposure ranges.
ii. Example: if the relative speed of a film/screen system is 200, then a PSP screen could cover
any speed from 20 to 2000.
Protective layer : a clear plastic
