Digital Radiography Image Processing Quiz

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Questions and Answers

What are the two types of digital read systems mentioned in the text?

Preprocessing Read System and Postprocessing Read System
Primary Read System and Secondary Read System
Direct Read System and Indirect Read System (correct)
Analog Read System and Digital Read System

What material is more popular in direct read systems due to its atomic number?

Amorphous selenium (Z=34) (correct)
Cesium Iodide Needle Crystals
Scintillating material
Amorphous silicon (Z=14)

What is the purpose of using CSI grown in 'needles' in flat panel detectors?

To improve spatial resolution by channeling light toward photodiode (correct)
To enhance blurring in the image
To increase light spreading within phosphor
To reduce the atomic number of the detector material

What is the function of conducting paths embedded within layers in indirect read systems?

To facilitate the movement of electrons (D) Signup and view all the answers

Which material is layered on the front surface of indirect flat panel detectors to convert X-ray to light?

Scintillating material (A) Signup and view all the answers

What is the purpose of edge enhancement in digital detectors?

To highlight the boundaries of structures in the image (A) Signup and view all the answers

What is the function of post-processing tools in digital radiography?

To enhance image quality after initial image acquisition (C) Signup and view all the answers

What is the purpose of convolution kernel in digital images?

To apply various image processing operations such as blurring or edge detection (A) Signup and view all the answers

What is the term for the process of improving the visibility of specific aspects of an image?

Filtering (B) Signup and view all the answers

Which term is used to indicate which frequencies have been suppressed during the filtering process?

Masking (A) Signup and view all the answers

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 (B) Signup and view all the answers

What is the term for the range of signal values that will be displayed as shades of gray?

Window Width (A) Signup and view all the answers

What does the term 'Window Level' refer to?

The location of the center of the window (D) Signup and view all the answers

What is the term for the mathematical instructions that indicate the set of values to be used in calculation?

Kernel (B) Signup and view all the answers

What is another term for 'low pass filter'?

Low cut filter (C) Signup and view all the answers

What does spatial filtering involve?

Altering each matrix value using neighboring pixels' values (B) Signup and view all the answers

What is the term for the concept of improving visibility of structures in a specific subset of the full range of signal values?

Windowing (A) Signup and view all the answers

What does the Window Width indicate?

The size of the opening of the window (A) Signup and view all the answers

What is the term for the term applied to the filtering process to indicate which frequencies have been suppressed?

Masking (A) Signup and view all the answers

What is the term for the process of deleting all but low frequencies during the filtering process?

Smoothing (D) Signup and view all the answers

What is the purpose of high fill factor in digital radiography?

To achieve better spatial resolution (A) Signup and view all the answers

What is the role of edge enhancement in digital radiography image processing?

Accentuating edges and effective for fractures and high-contrast tissues (D) Signup and view all the answers

What is the purpose of smoothing in digital radiography image processing?

To reduce display contrast and visibility of quantum mottle (D) Signup and view all the answers

What does the digital matrix consist of in digital radiography?

Voxels (depth) and pixels (picture elements) (C) Signup and view all the answers

What is the initial output of digital image receptors in digital radiography?

Analog signal (A) Signup and view all the answers

What is the main goal of spatial smoothing algorithms in digital radiography image processing?

To reduce quantum mottle without losing clinically significant detail (A) Signup and view all the answers

What is the purpose of convolution in digital radiography image processing?

Involves manipulating digital images through mathematical operations using kernels (C) Signup and view all the answers

What are the detector elements called in indirect CCL in digital radiography?

Dexels (D) Signup and view all the answers

What must pixels have to be useful in digital radiography?

Electronic, light-sensitive, and detector areas (A) Signup and view all the answers

What is the effect of edge enhancement in digital radiography image processing?

Helpful for detecting scaphoid fractures and making boundaries more distinct (C) Signup and view all the answers

What is the default edge enhancement value in digital radiography image processing?

Usually optimal (A) Signup and view all the answers

What is the main component of digital radiography image processing that aims to reduce quantum mottle?

Smoothing (C) Signup and view all the answers

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.

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Description

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.