Questions and Answers
What is digital imaging?
The acquisition of images to a computer rather than directly to film.
Which components are part of the Computed Radiography (CR) system?
The first clinical use of Computed Radiography (CR) was in Japan in 1983.
True
What does CR stand for in medical imaging?
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What technology replaces film in Computed Radiography?
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What is the difference between Computed Radiography (CR) and Direct Digital Radiography (DDR)?
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___ is a term used to describe total electronic imaging capturing.
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Digital radiography images cannot be modified once processed.
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What does PACS stand for?
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What is a histogram in the context of imaging?
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The optical density and contrast can be adjusted ___ the exposure by the radiographer.
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What is one advantage of CR/DR over Film/Screen methods?
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What is the main use of DICOM in medical imaging?
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Direct Radiography captures x-ray energy directly into a digital format without an image plate.
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Study Notes
Digital Imaging Overview
- Digital imaging involves capturing images directly to a computer instead of using film.
- Transition to "filmless" radiology marks significant advancements in the field.
Impact of New Technology
- Affects radiologic technologists, educators, administrators, and students.
- Many hospitals now utilize digital imaging equipment.
Computed Radiography (CR)
- Components include casettes with phosphor plates, ID stations, digitizers, and viewing stations.
- Offers a transition from traditional film-based imaging.
History of Computed Radiography
- Concept initiated in 1970; first clinical use in Japan was in 1983.
- By 1998, over 5000 CR systems were operational in the U.S.
Terminology
- F/S: Film/Screen (traditional method)
- CR: Computed Radiography
- DR: Digital Radiography
- DDR: Direct to Digital Radiography
Image Creation Process
- Both CR and DR utilize the same radiography equipment with differences in image capture, storage, and processing.
Conventional vs. Digital Imaging
- Conventional systems create analog images; digital systems need electronic signals converted to digital formats.
- CR uses photostimulable phosphor plates, while DR systems utilize transistors for direct image capture.
Image Capture Mechanisms
- CR involves PSP plates replacing traditional film, whereas DR captures photons directly on a transistor.
- Once exposed, the PSP plate generates a latent image that is then scanned for digital processing.
Advantages of CR/DR
- Enhancements in image quality and quick data retrieval eliminate issues related to lost films.
- Post-exposure adjustments can improve visualization without needing repeat exposures.
Storage and Archiving
- CR and DR systems can store thousands of images on compact media, reducing physical storage needs and degradation issues associated with film.
Image Transmission
- PACS (Picture Archiving and Communications System) and DICOM protocols facilitate digital image sharing and remote transmission.
Histogram Analysis
- A histogram represents gray scale value distributions in images, aiding in distinguishing between varying tissue densities.
Dose Implications
- Digital systems typically allow for lower radiation doses while maintaining image quality, enabling better patient safety.
Technique Considerations
- Image quality relies on proper positioning and collimation; poor technique can lead to artifacts and decreased detail.
- High-resolution imaging can potentially introduce new challenges and necessitate thorough training for technologists.
Continuous Improvement
- Emphasis on the need for established techniques and proper understanding of digital imaging principles remains vital to producing quality images.
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Description
Explore the world of digital radiography and its impact on the field of radiologic technology. This quiz covers the transition from traditional film to digital imaging, highlighting the implications for radiographers, educators, and students. Test your knowledge about the advancements in radiology technology.
