Ch. 12 Bushong

What is Computed Radiography (CR)?

A form of digital radiography

What does IP stand for?

imaging plate

What does PD stand for?

photodiode

What does PMT stand for?

photomultiplier tube

What does PSL stand for?

photostimulable luminescence

What does PSP stand for?

photostimulable phosphor

What does SP stand for?

storage phosphor

What does SPS stand for?

storage phosphor screen

What is Photostimulable luminescence?

Light emission stimulated by light

What is an Image receptor?

PSP screen inside a cassette

What is Light-stimulation—emission?

The process of emitting light upon stimulation by light.

What determines the spatial resolution of the CR imaging system?

The diameter of the laser beam

What is the Slow scan driver?

Part of the CR reader responsible for moving the imaging plate slowly.

What is the Fast scan driver?

Part of the CR reader responsible for rapidly scanning the imaging plate.

What does Laser intensity control?

Component that controls the intensity of the laser beam.

What is Scatter of stimulating beam?

The scattering effect of the stimulating laser beam.

What are Light quanta emitted by the screen?

The amount of light emitted by the screen when stimulated.

What are Light quanta collected?

The amount of light collected during the scanning process.

What is Sampling?

The process of converting continuous data into discrete values.

What is Quantization?

The process of assigning discrete values to the sampled data.

What is Spatial resolution?

Ability to distinguish small objects

What is Contrast resolution?

Ability to distinguish many shades of gray from black to white

What is Noise?

Random background interference that obscures the clear visualization of the image.

What are Artifacts?

Undesirable features or patterns in the image that can obscure or mimic actual anatomical structures.

What is the Image receptor response function?

Describes how the image receptor responds to different levels of radiation exposure.

How many gray levels are in a 14-bit CR image?

16,384

What is Image noise?

Random disturbances or unwanted information that obscures or degrades the quality of an image.

What is Scatter

redirection of photons as they interact with matter, resulting in decreased image quality and increased noise in radiographic images.