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Questions and Answers
What is the main function of an intensifying screen in a film-screen receptor?
What is an advantage of digital receptors over film-screen receptors?
What is the primary cause of size distortion in radiography?
What is a consequence of distortion in radiography?
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How do smaller pixels and higher resolution affect distortion in digital radiography?
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What is a characteristic of digital radiography receptors?
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What is a type of distortion that occurs due to unequal magnification or receptor curvature?
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What can introduce or correct for distortion in digital radiography, depending on the algorithm used?
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Study Notes
Radiography Image Receptors and Distortion
Image Receptors
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Film-Screen Receptors:
- Composed of a radiographic film and a intensifying screen
- Screen converts X-ray energy into visible light, which exposes the film
- Limitations: low sensitivity, high patient dose, and limited dynamic range
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Digital Receptors:
- Convert X-ray energy directly into digital signals
- Types: Computed Radiography (CR) and Digital Radiography (DR)
- Advantages: higher sensitivity, lower patient dose, and improved dynamic range
Distortion in Radiography
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Types of Distortion:
- Size Distortion: Enlargement or reduction of image size due to object-to-receptor distance
- Shape Distortion: Alteration of object shape due to unequal magnification or receptor curvature
- Position Distortion: Shift of image position due to receptor misalignment or object movement
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Causes of Distortion:
- Object-to-receptor distance
- Receptor curvature or non-uniformity
- X-ray beam angulation or divergence
- Patient movement or positioning errors
-
Effects of Distortion:
- Diagnostic accuracy and confidence
- Measurement accuracy (e.g., bone length or density)
- Image quality and aesthetics
Factors Affecting Distortion in Digital Radiography
- Pixel Size and Resolution: Smaller pixels and higher resolution reduce distortion
- Detector Element Size and Shape: Larger elements and irregular shapes can increase distortion
- Receptor Design and Material: Curved or non-uniform receptors can introduce distortion
- Image Processing Algorithms: Can introduce or correct for distortion, depending on the algorithm used
Radiography Image Receptors
- Film-Screen Receptors: composed of radiographic film and intensifying screen, which converts X-ray energy into visible light, exposing the film
- Limitations of Film-Screen Receptors: low sensitivity, high patient dose, and limited dynamic range
- Digital Receptors: convert X-ray energy directly into digital signals, with advantages of higher sensitivity, lower patient dose, and improved dynamic range
- Types of Digital Receptors: Computed Radiography (CR) and Digital Radiography (DR)
Distortion in Radiography
Types of Distortion
- Size Distortion: enlargement or reduction of image size due to object-to-receptor distance
- Shape Distortion: alteration of object shape due to unequal magnification or receptor curvature
- Position Distortion: shift of image position due to receptor misalignment or object movement
Causes of Distortion
- Object-to-receptor distance
- Receptor curvature or non-uniformity
- X-ray beam angulation or divergence
- Patient movement or positioning errors
Effects of Distortion
- Diagnostic accuracy and confidence
- Measurement accuracy (e.g., bone length or density)
- Image quality and aesthetics
Factors Affecting Distortion in Digital Radiography
Detector Design and Properties
- Pixel Size and Resolution: smaller pixels and higher resolution reduce distortion
- Detector Element Size and Shape: larger elements and irregular shapes can increase distortion
Receptor Design and Material
- Curved or non-uniform receptors can introduce distortion
Image Processing
- Image processing algorithms can introduce or correct for distortion, depending on the algorithm used
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Description
This quiz covers the basics of radiography image receptors, including film-screen receptors and digital receptors, and their advantages and limitations.
