Chapter 2 Digital Imaging Characteristics
Questions and Answers| Latest Update
Is used to ensure that imaging equipment is functioning appropriately ✔️✔️Standardized
radiation exposure (KSTD)
The measurement of the radiation that reached the image receptor ✔️✔️Indicated equivalent
air karma (KIND)
An ideal exposure for each specific part and view ✔️✔️Target equivalent air karma value
(KTGT)
The difference between the actual exposure (KIND) and the "perfect" or target exposure (KTGT)
✔️✔️Deviation index (DI)
Image quality characteristics ✔️✔️Brightness/luminance, contrast resolution, spatial
resolution
Refers to the amount of light emitted by the monitor. No technical adjustment during image
acquisition will change the brightness of the image; strictly a display quality
✔️✔️Brightness/luminance
The ability of the digital system to display subtle changes in shades of gray. This in digital
imaging is directly related to the bit depth of the pixels of the image. ✔️✔️Contrast resolution
The ability of the imaging system to demonstrate small details of an object. Smaller pixels =
higher ✔️✔️Spatial resolution
, Soft tissue on an image of a knee projection is due to what? ✔️✔️Wide dynamic range
The ability of an imaging system to record available spatial frequencies/incoming x-ray
information. Overall efficiency of the system ✔️✔️Modulation transfer function (MTF)
Light spread reduces: ✔️✔️System efficiency
The more light spread, the __________ the MTF ✔️✔️Lower
Anything that interferes the formation of the image, occurs during the acquisition of the image
✔️✔️Noise
Depends on the amount of noise that can be tolerated by radiologist and tech ✔️✔️Signal-to-
noise ratio (SNR)
a high ________ is our goal ✔️✔️SNR
As SNR increases, noise ___________, but patient exposure ______________. ✔️✔️decreases,
increases
Refers to the range of exposures that radiographic film can respond to in order to produce an
optimal image ✔️✔️Exposure latitude
Ability of a digital imaging system to respond to varying levels of exposure ✔️✔️Dynamic
range
Describes how efficiently a system converts the x-ray input signal into a useful output image
✔️✔️Detective quantum efficiency (DQE)
Questions and Answers| Latest Update
Is used to ensure that imaging equipment is functioning appropriately ✔️✔️Standardized
radiation exposure (KSTD)
The measurement of the radiation that reached the image receptor ✔️✔️Indicated equivalent
air karma (KIND)
An ideal exposure for each specific part and view ✔️✔️Target equivalent air karma value
(KTGT)
The difference between the actual exposure (KIND) and the "perfect" or target exposure (KTGT)
✔️✔️Deviation index (DI)
Image quality characteristics ✔️✔️Brightness/luminance, contrast resolution, spatial
resolution
Refers to the amount of light emitted by the monitor. No technical adjustment during image
acquisition will change the brightness of the image; strictly a display quality
✔️✔️Brightness/luminance
The ability of the digital system to display subtle changes in shades of gray. This in digital
imaging is directly related to the bit depth of the pixels of the image. ✔️✔️Contrast resolution
The ability of the imaging system to demonstrate small details of an object. Smaller pixels =
higher ✔️✔️Spatial resolution
, Soft tissue on an image of a knee projection is due to what? ✔️✔️Wide dynamic range
The ability of an imaging system to record available spatial frequencies/incoming x-ray
information. Overall efficiency of the system ✔️✔️Modulation transfer function (MTF)
Light spread reduces: ✔️✔️System efficiency
The more light spread, the __________ the MTF ✔️✔️Lower
Anything that interferes the formation of the image, occurs during the acquisition of the image
✔️✔️Noise
Depends on the amount of noise that can be tolerated by radiologist and tech ✔️✔️Signal-to-
noise ratio (SNR)
a high ________ is our goal ✔️✔️SNR
As SNR increases, noise ___________, but patient exposure ______________. ✔️✔️decreases,
increases
Refers to the range of exposures that radiographic film can respond to in order to produce an
optimal image ✔️✔️Exposure latitude
Ability of a digital imaging system to respond to varying levels of exposure ✔️✔️Dynamic
range
Describes how efficiently a system converts the x-ray input signal into a useful output image
✔️✔️Detective quantum efficiency (DQE)
