32 Questions
What are the two types of digital read systems mentioned in the text?
Direct Read System and Indirect Read System
What material is more popular in direct read systems due to its atomic number?
Amorphous selenium (Z=34)
What is the purpose of using CSI grown in 'needles' in flat panel detectors?
To improve spatial resolution by channeling light toward photodiode
What is the function of conducting paths embedded within layers in indirect read systems?
To facilitate the movement of electrons
Which material is layered on the front surface of indirect flat panel detectors to convert X-ray to light?
Scintillating material
What is the purpose of edge enhancement in digital detectors?
To highlight the boundaries of structures in the image
What is the function of post-processing tools in digital radiography?
To enhance image quality after initial image acquisition
What is the purpose of convolution kernel in digital images?
To apply various image processing operations such as blurring or edge detection
What is the term for the process of improving the visibility of specific aspects of an image?
Filtering
Which term is used to indicate which frequencies have been suppressed during the filtering process?
Masking
What is the term for the concept of altering each matrix value by performing a math function on it using neighboring pixels' values?
Spatial Filtering
What is the term for the range of signal values that will be displayed as shades of gray?
Window Width
What does the term 'Window Level' refer to?
The location of the center of the window
What is the term for the mathematical instructions that indicate the set of values to be used in calculation?
Kernel
What is another term for 'low pass filter'?
Low cut filter
What does spatial filtering involve?
Altering each matrix value using neighboring pixels' values
What is the term for the concept of improving visibility of structures in a specific subset of the full range of signal values?
Windowing
What does the Window Width indicate?
The size of the opening of the window
What is the term for the term applied to the filtering process to indicate which frequencies have been suppressed?
Masking
What is the term for the process of deleting all but low frequencies during the filtering process?
Smoothing
What is the purpose of high fill factor in digital radiography?
To achieve better spatial resolution
What is the role of edge enhancement in digital radiography image processing?
Accentuating edges and effective for fractures and high-contrast tissues
What is the purpose of smoothing in digital radiography image processing?
To reduce display contrast and visibility of quantum mottle
What does the digital matrix consist of in digital radiography?
Voxels (depth) and pixels (picture elements)
What is the initial output of digital image receptors in digital radiography?
Analog signal
What is the main goal of spatial smoothing algorithms in digital radiography image processing?
To reduce quantum mottle without losing clinically significant detail
What is the purpose of convolution in digital radiography image processing?
Involves manipulating digital images through mathematical operations using kernels
What are the detector elements called in indirect CCL in digital radiography?
Dexels
What must pixels have to be useful in digital radiography?
Electronic, light-sensitive, and detector areas
What is the effect of edge enhancement in digital radiography image processing?
Helpful for detecting scaphoid fractures and making boundaries more distinct
What is the default edge enhancement value in digital radiography image processing?
Usually optimal
What is the main component of digital radiography image processing that aims to reduce quantum mottle?
Smoothing
Study Notes
Digital Radiography Image Processing Summary
- Indirect CCL collects light for the detector elements called dexels.
- Pixels must have electronic, light-sensitive, and detector areas to be useful.
- High fill factor is desired for better spatial resolution, with 100% fill factor being ideal.
- Digital matrix consists of voxels (depth) and pixels (picture elements).
- Initial stages of digital image receptors produce an analog signal, which is later digitized.
- Image processing options include edge enhancement and smoothing.
- Edge enhancement accentuates edges and is effective for fractures and high-contrast tissues.
- Default edge enhancement values are usually optimal, but radiologists may adjust them.
- Edge enhancement is helpful for detecting scaphoid fractures and making boundaries more distinct.
- Smoothing reduces display contrast and visibility of quantum mottle.
- Convolution involves manipulating digital images through mathematical operations using kernels.
- Spatial smoothing algorithms aim to reduce quantum mottle without losing clinically significant detail.
Test your knowledge of digital radiography image processing with this quiz. Explore topics such as the digital matrix, edge enhancement, smoothing, and the manipulation of digital images through convolution. Gain insights into the key concepts and techniques used in digital radiography image processing.
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