Classes of Digital image processing operations Flashcards
What is the role of virtual reality in image analysis?
Virtual reality systems convert CT scans into 3D images that radiologists can virtually move and examine for detailed analysis.
What is noise reduction in image enhancement?
Noise reduction is the process of removing unwanted noise from a signal or image to improve its quality
What is edge enhancement in image processing?
Edge enhancement is an image processing algorithm that improves the sharpness of an image by enhancing the edges of objects within the image.
What is wavelet compression in image processing?
Wavelet compression is a form of image compression that uses special wave forms to reduce image size without losing detail.
What is the key difference between film-screen radiography and computed radiography (CR) in terms of image formation?
In film-screen radiography, light from the intensifying screen exposes the film, while in CR, X-ray interaction traps electrons in a higher energy metastable state, which is later released as light during processing.
What are the similarities between film-screen radiography and computed radiography (CR)?
Both use an X-ray sensitive plate encased in a protective cassette.
Both produce a latent image that must be processed to become visible.
Both use a conventional X-ray machine.
Both require an image processor to render the latent image visible.
What are the three common elements of digital radiography systems?
The capture element
The coupling element
The collection element
What are the four forms of digital radiography systems available on the market?
Computed radiography (CR) system
Direct digital system
Indirect digital system
Scanned projection radiography system
What is the function of the CR image reader?
The CR image reader processes the imaging plate by scanning it with a laser beam to release trapped electrons as light (photostimulable luminescence), which is then converted into electrical signals and digitized to produce the CR image.
What is the role of the image display workstation in a CR system?
Displays digitized images.
Shows patient worklists.
Provides image post-processing options.
What is the purpose of the imaging plate in a CR system?
The imaging plate captures X-rays transmitted through the patient and stores the latent image in the form of trapped electrons, which are later released as light during processing.
What is photostimulable luminescence (PSL) in computed radiography?
Photostimulable luminescence is the phenomenon where photostimulable phosphors emit light when struck by a laser beam after being exposed to X-rays, creating a visible image from the latent image.
How does the CR system convert the latent image into a visible image?
The CR system scans the imaging plate with a laser beam, causing the trapped electrons to emit light (photostimulable luminescence). This light is converted into electrical signals, which are digitized and processed to produce the visible CR image.
What is the difference between direct and indirect digital radiography systems?
Direct digital radiography systems convert X-rays directly into electrical signals, while indirect systems first convert X-rays into light, which is then converted into electrical signals.
What is the significance of the CR processor in the imaging process?
The CR processor digitizes the latent image stored on the imaging plate by converting the emitted light into electrical signals, which are then processed to create the final digital image.
What is the importance of understanding the internal components of CR equipment for a radiographer?
Understanding the internal components helps radiographers optimize image quality, troubleshoot issues, and ensure proper use of the equipment for accurate diagnostics.
