Computed vs Digital Radiography Quiz & Flashcards

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Questions and Answers

What term includes both computed radiography (CR) and direct radiography (DR)?

Diagnostic imaging

Digital radiography (correct)

Computed radiography

Direct radiography

When did digital radiography enter the medical field?

1960s

1990s

1980s

1970s (correct)

What company introduced the first CR systems in the US?

Fuji (correct)

Phillips

Siemens

What is the main component of CR imaging plates?

Barium fluorohalide crystals Signup and view all the answers

What is the purpose of europium doping in CR imaging plates?

To create defects in the barium fluorohalide crystals Signup and view all the answers

What is the function of the CR reader?

To scan the imaging plate with a high-intensity laser beam Signup and view all the answers

What is the outcome of exposing a CR imaging plate to the exit beam?

A latent image is formed on the CR plate Signup and view all the answers

What is the purpose of the CR workstation?

To process the digitized signal Signup and view all the answers

What type of laser beam is used to scan the CR imaging plate?

Red light Signup and view all the answers

What is the purpose of exposing the CR plate to a bright white light after use?

To remove any residual energy and prevent a ghost image Signup and view all the answers

What is the result of incomplete clearing of the CR plate?

A ghost image remains on the CR plate Signup and view all the answers

What is the function of the Analog-to-Digital Converter (ADC) in CR processing?

To convert the electronic signal from the PMT into a digital signal Signup and view all the answers

What is the effect of not recognizing the collimated borders during image data analysis?

The image data analysis will include all data outside the collimation Signup and view all the answers

What is the purpose of using a fiber optic light guide in CR processing?

To collect and send the blue-green light to the PMT Signup and view all the answers

What is the effect of scatter radiation on the CR plate?

It reduces the brightness and contrast of the final image Signup and view all the answers

What is the purpose of the workstation in CR processing?

To allow for post-processing image manipulation Signup and view all the answers

Why should CR plates be erased after 48 hours of non-use?

To prevent background and scatter radiation from affecting the plate Signup and view all the answers

What is the process called when the laser stimulates the movement of trapped electrons back to their original position?

Light-stimulated phosphorescence Signup and view all the answers

Study Notes

Digital Radiography

Digital radiography includes both computed radiography (CR) and direct radiography (DR).
Digital radiography entered the medical field around the late 1980s and early 1990s.

Computed Radiography (CR)

The first CR systems in the US were introduced by Fuji Photo Film.
The main component of CR imaging plates is Photostimulable Phosphor (PSP).
Europium doping enhances the luminescent properties of the imaging plates, improving image quality.

CR Reader and Imaging Process

The CR reader scans the imaging plate to retrieve stored data by stimulating the phosphors with a laser beam.
Exposing a CR imaging plate to the exit beam captures an image by converting x-rays to electron energy within the phosphor.
The CR workstation processes the data retrieved from the CR reader for viewing and analysis.

Laser and Light Exposure

A solid-state laser beam is utilized to scan the CR imaging plate, ensuring precise reading of the stored image.
Exposing the CR plate to bright white light after use resets the phosphor and eliminates residual image data.

Image Processing and Artifacts

Incomplete clearing of the CR plate can lead to residual ghost images that affect diagnostic accuracy.
The Analog-to-Digital Converter (ADC) in CR processing converts the analog signal from the imaging plate to a digital format for further processing.
Not recognizing the collimated borders during image data analysis may result in inaccurate measurements and diagnostics.

Fiber Optic and Radiation Effects

A fiber optic light guide in CR processing directs light efficiently from the imaging plate to the reader, enhancing image capture.
Scatter radiation can negatively impact the quality of the CR plate, leading to noise and artifacts in the images.

Workstation Functions

The workstation in CR processing is essential for image processing, storage, and retrieval, facilitating efficient diagnostics.
CR plates should be erased after 48 hours of non-use to prevent unwanted retention of data and maintain image clarity.

Electron Movement

The process whereby the laser stimulates trapped electrons to return to their original position is known as photostimulated luminescence.

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Description

Learn about the history and development of digital radiography, including computed radiography (CR) and direct radiography (DR). Discover how digital radiography entered the medical field and how CR systems evolved over time.