Test Bank For Digital Radiography
1. Which of the following is a primary advantage of digital radiography over
traditional film-based radiography?
A) Increased patient dose
B) Improved image resolution
C) Faster image acquisition and processing
D) Higher cost of equipment
Answer: C) Faster image acquisition and processing
2. What is the term used to describe the process of converting X-ray photons into
electrical signals in a digital radiography system?
A) Photostimulable luminescence
B) Scintillation
C) Conversion
D) Digitalization
Answer: B) Scintillation
3. In digital radiography, which of the following detectors is commonly used to
capture X-ray photons and convert them to an electrical signal?
A) Photodiode
B) Flat-panel detector
C) Charged-coupled device (CCD)
D) Film-screen combination
Answer: B) Flat-panel detector
4. What type of digital radiography system uses a photostimulable phosphor plate to
capture and store X-ray information?
A) Direct digital radiography
,B) Computed radiography
C) Analog radiography
D) Digital subtraction angiography
Answer: B) Computed radiography
5. Which of the following factors does NOT affect the quality of a digital radiographic
image?
A) Detector type
B) Grid ratio
C) Exposure parameters
D) Image processing algorithms
Answer: B) Grid ratio
6. What is the purpose of the histogram in digital radiography?
A) To display the distribution of pixel values in the image
B) To enhance the contrast of the image
C) To control the exposure time
D) To calibrate the X-ray tube
Answer: A) To display the distribution of pixel values in the image
7. In digital radiography, what is the significance of the term "bit depth"?
A) It refers to the number of gray levels that can be displayed in an image
B) It is the thickness of the detector
C) It represents the spatial resolution of the image
D) It defines the X-ray tube voltage
Answer: A) It refers to the number of gray levels that can be displayed in an image
8. What is the typical resolution range for digital radiography systems?
,A) 1-5 line pairs per millimeter
B) 10-20 line pairs per millimeter
C) 50-100 line pairs per millimeter
D) 200-400 line pairs per millimeter
Answer: B) 10-20 line pairs per millimeter
9. In digital radiography, what is the primary function of image processing
algorithms?
A) To reduce patient dose
B) To enhance image quality and clarity
C) To increase the physical size of the detector
D) To change the X-ray tube settings
Answer: B) To enhance image quality and clarity
10. What is the role of automatic exposure control (AEC) in digital radiography?
A) To manually adjust exposure settings
B) To automatically adjust the X-ray exposure based on patient size and anatomy
C) To increase the resolution of the image
D) To ensure that the image is properly processed
Answer: B) To automatically adjust the X-ray exposure based on patient size and
anatomy
11. What is the main function of a direct digital radiography (DR) system?
A) To capture and digitize X-ray images directly using a flat-panel detector
B) To process film-based images into a digital format
C) To store X-ray images on a phosphor plate
D) To manually develop X-ray films
Answer: A) To capture and digitize X-ray images directly using a flat-panel detector
, 12. Which of the following best describes the term "spatial resolution" in digital
radiography?
A) The ability to distinguish between two adjacent structures in an image
B) The number of gray levels in an image
C) The time required to acquire an image
D) The size of the detector
Answer: A) The ability to distinguish between two adjacent structures in an image
13. In digital radiography, which component is responsible for converting X-ray
photons into an electrical signal in direct DR systems?
A) Indirect converter
B) Photostimulable phosphor
C) Thin-film transistor (TFT)
D) Charge-coupled device (CCD)
Answer: C) Thin-film transistor (TFT)
14. What is the main advantage of using a digital radiography system with a flat-
panel detector compared to traditional film-based systems?
A) Increased film processing time
B) Higher susceptibility to image artifacts
C) Reduced image processing time and improved workflow
D) Increased cost of film and processing materials
Answer: C) Reduced image processing time and improved workflow
15. What does the term "signal-to-noise ratio" (SNR) refer to in digital radiography?
A) The amount of background noise present in the image compared to the actual
signal
B) The size of the detector in the system
1. Which of the following is a primary advantage of digital radiography over
traditional film-based radiography?
A) Increased patient dose
B) Improved image resolution
C) Faster image acquisition and processing
D) Higher cost of equipment
Answer: C) Faster image acquisition and processing
2. What is the term used to describe the process of converting X-ray photons into
electrical signals in a digital radiography system?
A) Photostimulable luminescence
B) Scintillation
C) Conversion
D) Digitalization
Answer: B) Scintillation
3. In digital radiography, which of the following detectors is commonly used to
capture X-ray photons and convert them to an electrical signal?
A) Photodiode
B) Flat-panel detector
C) Charged-coupled device (CCD)
D) Film-screen combination
Answer: B) Flat-panel detector
4. What type of digital radiography system uses a photostimulable phosphor plate to
capture and store X-ray information?
A) Direct digital radiography
,B) Computed radiography
C) Analog radiography
D) Digital subtraction angiography
Answer: B) Computed radiography
5. Which of the following factors does NOT affect the quality of a digital radiographic
image?
A) Detector type
B) Grid ratio
C) Exposure parameters
D) Image processing algorithms
Answer: B) Grid ratio
6. What is the purpose of the histogram in digital radiography?
A) To display the distribution of pixel values in the image
B) To enhance the contrast of the image
C) To control the exposure time
D) To calibrate the X-ray tube
Answer: A) To display the distribution of pixel values in the image
7. In digital radiography, what is the significance of the term "bit depth"?
A) It refers to the number of gray levels that can be displayed in an image
B) It is the thickness of the detector
C) It represents the spatial resolution of the image
D) It defines the X-ray tube voltage
Answer: A) It refers to the number of gray levels that can be displayed in an image
8. What is the typical resolution range for digital radiography systems?
,A) 1-5 line pairs per millimeter
B) 10-20 line pairs per millimeter
C) 50-100 line pairs per millimeter
D) 200-400 line pairs per millimeter
Answer: B) 10-20 line pairs per millimeter
9. In digital radiography, what is the primary function of image processing
algorithms?
A) To reduce patient dose
B) To enhance image quality and clarity
C) To increase the physical size of the detector
D) To change the X-ray tube settings
Answer: B) To enhance image quality and clarity
10. What is the role of automatic exposure control (AEC) in digital radiography?
A) To manually adjust exposure settings
B) To automatically adjust the X-ray exposure based on patient size and anatomy
C) To increase the resolution of the image
D) To ensure that the image is properly processed
Answer: B) To automatically adjust the X-ray exposure based on patient size and
anatomy
11. What is the main function of a direct digital radiography (DR) system?
A) To capture and digitize X-ray images directly using a flat-panel detector
B) To process film-based images into a digital format
C) To store X-ray images on a phosphor plate
D) To manually develop X-ray films
Answer: A) To capture and digitize X-ray images directly using a flat-panel detector
, 12. Which of the following best describes the term "spatial resolution" in digital
radiography?
A) The ability to distinguish between two adjacent structures in an image
B) The number of gray levels in an image
C) The time required to acquire an image
D) The size of the detector
Answer: A) The ability to distinguish between two adjacent structures in an image
13. In digital radiography, which component is responsible for converting X-ray
photons into an electrical signal in direct DR systems?
A) Indirect converter
B) Photostimulable phosphor
C) Thin-film transistor (TFT)
D) Charge-coupled device (CCD)
Answer: C) Thin-film transistor (TFT)
14. What is the main advantage of using a digital radiography system with a flat-
panel detector compared to traditional film-based systems?
A) Increased film processing time
B) Higher susceptibility to image artifacts
C) Reduced image processing time and improved workflow
D) Increased cost of film and processing materials
Answer: C) Reduced image processing time and improved workflow
15. What does the term "signal-to-noise ratio" (SNR) refer to in digital radiography?
A) The amount of background noise present in the image compared to the actual
signal
B) The size of the detector in the system
