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RAD 111: Test 4--Digital Imaging & PACS Test Review Questions with Complete Solutions

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RAD 111: Test 4--Digital Imaging & PACS Test Review Questions with Complete Solutions What is the primary advantage of digital radiography over traditional film-based radiography? It allows for immediate image acquisition and processing. What does PACS stand for in radiology? Picture ...

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  • January 26, 2025
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  • RAD 111: Tst 4--Digital Imaging & PACS
  • RAD 111: Tst 4--Digital Imaging & PACS
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RAD 111: Test 4--Digital Imaging & PACS
Test Review Questions with Complete
Solutions
What is the primary advantage of digital radiography over traditional film-based radiography?


✔✔ It allows for immediate image acquisition and processing.




What does PACS stand for in radiology?


✔✔ Picture Archiving and Communication System.




What is the main function of the image receptor in digital imaging?


✔✔ To capture the X-ray image and convert it into a digital signal.




What is the role of the analog-to-digital converter (ADC) in digital imaging?


✔✔ To convert the analog image into a digital format for processing and display.




What is the significance of spatial resolution in digital radiography?


✔✔ It refers to the ability of the system to distinguish fine details in the image.




1

,What does the term "dynamic range" refer to in digital imaging?


✔✔ The range of exposures that a digital system can accurately capture, from the darkest to the

lightest areas.




What is the purpose of the pixel in digital imaging?


✔✔ A pixel is the smallest unit of a digital image that represents a specific area of the body in

the radiograph.




What is the difference between direct and indirect digital imaging?


✔✔ Direct digital imaging uses a flat-panel detector to capture the image, while indirect imaging

uses a phosphor plate to capture the image before converting it to a digital format.




What is the function of a digital display monitor in radiology?


✔✔ To view and interpret digital radiographs in high resolution.




How does digital image processing improve image quality?


✔✔ It enhances contrast, sharpness, and noise reduction to improve diagnostic quality.




2

,What is the purpose of using a grid in digital radiography?


✔✔ To reduce scatter radiation and improve image contrast.




What is the difference between a conventional film and a digital radiograph in terms of exposure

latitude?


✔✔ Digital radiographs have a wider exposure latitude, allowing for more flexibility in

capturing images under varying conditions.




What is the term used to describe the brightness of a digital radiographic image?


✔✔ Luminance.




What is a common digital imaging artifact and its cause?


✔✔ Moiré pattern, often caused by a mismatch between the grid frequency and the sampling

frequency of the digital detector.




What is the role of the flat-panel detector in digital radiography?


✔✔ To capture the X-ray image and convert it into an electrical signal for processing.




3

, What does the term "bit depth" refer to in digital imaging?


✔✔ The number of bits used to represent each pixel, determining the image's contrast resolution.




What is a major advantage of PACS in radiology departments?


✔✔ It allows for the storage, retrieval, and sharing of images digitally, improving workflow and

accessibility.




How does a CR (computed radiography) system work in digital imaging?


✔✔ It uses a phosphor plate to capture the X-ray image, which is then read and converted into a

digital image by a scanner.




What is the difference between a CCD and a CMOS detector in digital radiography?


✔✔ CCD (charge-coupled device) and CMOS (complementary metal-oxide-semiconductor) are

both types of digital detectors, but CCD typically offers higher image quality, while CMOS is

more cost-effective.




What is the term used to describe the number of pixels in an image?


✔✔ Pixel matrix or image resolution.




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