RTBC Digital Radiography Assessment Practice Test

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• What effect does increased collimation have on image quality in digital radiography?
• What is the function of a thin-film transistor (TFT) in flat-panel detector systems?
• What is a common characteristic of direct digital radiography systems?
• What is the percentage of the detector element (DEL) devoted to the detection layer called?
• Which measurement reflects the maximum range of signal intensities a digital system can represent?
• What step in digital image processing identifies the useful exposure values ("values of interest") in raw image data?
• What is the impact of using high-quality image receptors in digital radiography?
• What is the purpose of automatic exposure control (AEC) in digital radiography?
• Which two components collect and convert light into an electrical signal in flat-panel detectors?
• What is the effect of beam hardening during digital imaging?
• In the context of a flat-panel detector, what is the purpose of the antistatic layer?
• Which factor increases the Detective Quantum Efficiency (DQE)?
• What do higher values in the modulation transfer function (MTF) suggest about an imaging system?
• What can be a consequence of excessive exposure in digital radiography?
• Calculate the pixel size given these variables: Matrix size = 512 x 512 and Field-of-View = 12 cm.
• Which of the following best describes the relationship between kVp and image quality?
• What issue can 'beam hardening' introduce into digital radiography?
• What does the term 'modulation transfer function' relate to in radiography?
• Which of the following makes up a single detector element (DEL)?
• Which of the following factors influences the grayscale of a digital radiograph?
• What is the primary advantage of a lower fill factor in a detector?
• What is the typical response time of a digital radiography system?
• Which element used in the construction of a flat-panel detector is able to convert the x-ray photons directly into an electrical signal?
• What is one of the main advantages of digital radiography compared to traditional methods?
• The Modulation Transfer Function (MTF) evaluates the:
• How do updates to digital radiography systems typically enhance performance?
• Within a digital radiography image matrix, 1024 x 1024 refers to the:
• What is the effect of grid use on digital radiographic images?
• Which of the following approaches to increasing the signal may lead to an increase in scatter reaching the IR?
• Explain the term "energy level" in relation to digital radiography.
• Which of the following bit depths enables a digital radiography system to display the greatest amount of anatomic information in an image?
• What does a high Detective Quantum Efficiency indicate?
• What MTF score indicates that an image perfectly represents the object in both spatial resolution and contrast?
• Which of the following would decrease the Detective Quantum Efficiency (DQE)?
• Which type of digital imaging detector converts x-ray photons directly into an electric signal?
• What does "post-processing" involve in the digital radiography workflow?
• How does collimation benefit digital radiography?
• Multiple factors like quantum noise, quantum mottle, and photon starvation contribute to which issue in imaging?
• What term describes the amount of photons that are absorbed by the detector?
• In the context of digital radiography, what is a "pixel"?
• What is another name for the conductive layer of a CR plate?
• How can the signal-to-noise ratio affect image quality in digital radiography?
• What is recommended for ensuring effective infection control in radiography?
• Modulation Transfer Function (MTF) is also referred to as which of the following?
• Processing a tibia-fibula radiograph as an abdomen may result in which of the following?
• Which component is primarily responsible for noise in digital images?
• What does the term "saturation" refer to in digital radiography?
• Which of the following is a common error in digital radiography related to improper exposure?
• What is the primary purpose of digital radiography (DR)?
• What is the term for the visible result of insufficient exposure on a digital image?
• What device is needed to transfer the latent image within the imaging plate to a viewable digital radiograph?
• Detective Quantum Efficiency (DQE) is defined as what?
• Which components of an indirect capture flat-panel detector converts the visible light into electrons?
• Which of the following is an advantage of digital radiography over conventional radiography?
• Why is patient positioning important in digital radiography?
• Which of the following factors would produce a radiographic image with the highest spatial resolution?
• Which of the following affects the spatial resolution in digital radiography?
• Which line pairs per millimeter would represent the highest spatial frequency?
• How does the size of pixels affect image resolution in radiography?
• What type of image is likely to demonstrate a high level of quantum mottle?
• What role does the digital detector play in digital radiography?
• What is expected to display when a receptor exposure of 0.001 microgray occurs?
• In a charged coupled device (CCD) system, the scintillation layer is connected to the CCD sensor chips by which of the following?
• Define "quantum mottle" in the context of digital imaging.
• What is the primary purpose of using a lookup table in digital radiography?
• Which layer of the CR imaging plate prevents unwanted light and background radiation from affecting the unprocessed latent image?
• What is the typical range for the exposure index in digital radiography?
• Which part of the detector element (DEL) is responsible for detecting radiation?
• What is the primary purpose of image receptors in digital radiography?
• What is a common effect of increasing kVp in radiography?
• Which two technologist errors are most likely to result in incorrect histogram rescaling and lookup table adjustment?
• Which of the following makes up the digital matrix of the image file?
• Which of the following describes a benefit of using a CCD in digital radiography?
• A histogram in digital radiography refers to what?
• What phenomenon is also referred to as quantum noise in radiography?
• How can artifacts in digital radiography be minimized?
• What principle underlies computed radiography (CR)?
• Signal-to-noise ratio (SNR) is increased whenever:
• Which two materials can be used in the construction of the computed radiography (CR) imaging plate outer cassette?
• What can be a consequence of improper patient positioning in radiography?
• What is the significance of the exposure index in digital radiography?
• What combination of noise and signal is demonstrated when a radiograph has a high DQE?
• Which aspect of digital imaging is most affected by quantum mottle?
• Which component of an indirect capture flat-panel detector converts incident x-ray photons into visible light photons?
• How does fill factor relate to spatial resolution in digital radiography?
• What is a potential risk of overexposure in digital radiography?
• Which of the following radiographic matrices will create an image with the smallest pixels?
• Which material is responsible for storing the latent image within the computed radiography (CR) imaging plate?
• Amorphous Selenium is primarily used in which type of imaging system?
• What is the term for the blotchy appearance caused by an insufficient number of photons reaching the image receptor?
• What process corrects slight under-exposure or over-exposure errors made by the technologists?
• Which of the following components is not utilized for CR systems?
• What action can help reduce system noise?
• Photons that add information but do not represent the anatomic structures are considered what type of radiation?
• Which process is used to display the digital image with the ideal brightness and contrast?
• What is exposure latitude defined as?
• Which radiographic matrix would produce the greatest spatial frequency?
• Which method can primarily reduce patient dose during digital imaging?
• Which layer of the CR imaging plate is responsible for creating the latent image from the transmitted x-ray photons exiting the patient?
• Which MTF score indicates the highest imaging capability?
• The primary function of the analog-to-digital converter (ADC) within the computed radiography (CR) imaging plate reader is to convert:
• An x-ray exposure above the highest level of the exposure latitude may result in an image error called:
• Which components make up the capture area of a detector element (DEL)?
• Out of the given line pairs per millimeter selections for spatial frequency, which would represent the highest Modulation Transfer Function (MTF) score?
• What does the thin, active layer within the computed radiography (CR) cassette store?
• Which of the following is created on an image receptor by the arrangement of the detector elements (DELs) into rows and columns?
• In digital radiography, what does the term 'windowing' refer to?
• What key factor affects patient dose in digital radiography?
• The most common CR imaging plate readers contain which of the following components?
• What does the acronym DQE stand for?
• What is the function of the conductor layer within the CR imaging plate?
• What is the main purpose of a radiology information system (RIS)?
• Which three of the following components are included in indirect capture flat-panel digital image detector systems?
• Dynamic range in radiographic imaging refers to what?
• What is a key focus of training for radiologic technologists?
• What is the role of a "dark room" in digital radiography systems?
• How does proper positioning of a patient impact the outcome of a digital radiographic exam?
• What does improved image quality in digital fluoroscopy lead to?
• What units are used to express the spatial frequency?
• What impact does beam hardening have on digital radiographs?
• Which device may replace the photomultiplier tube (PMT) in a computed radiography (CR) image reader system?
• What does image thresholding achieve in digital imaging?
• What is the primary purpose of using grids in radiography?
• A matrix that is 2048 x 2048 contains how many pixels?
• What term is synonymous with photon?
• Out of the following combinations, which two will result in an x-ray system that has a high Detective Quantum Efficiency (DQE)?
• What is the consequence of a low signal-to-noise ratio in digital radiography?
• What is the primary purpose of the laser within the CR digitizer?
• What role does a Picture Archiving and Communication System (PACS) play in patient care?
• What does lower radiation exposure in digital fluoroscopy improve?
• In a radiographic histogram, what does the Y-axis represent?
• Which component is essential for converting analog signals to digital in radiography?
• During digital formation processing, quantization takes place in which of the following?
• In digital radiography, high signal-to-noise ratio is essential for which of the following?
• What does the abbreviation MTF stand for in radiography?
• What happens when a CR imaging plate is exposed to white light?
• Quantization is a digital radiography process through which receptor readings are:
• Which of the following will increase the contrast resolution of a digital radiographic system?
• Which characteristic of an imaging plate affects the quality of the resulting radiograph?
• A radiographer acquires an optimal image of the wrist using 60 kVp and 2.5 mAs. Acquiring the same projection using a technique of 72 kVp and 5 mAs will result in which of the following?
• What is a primary reason for training radiologic technologists in digital radiography?
• Which factors influence the quality of digital images?
• Which factor would lead to an increase in patient dose?
• What is the role of the photomultiplier tube (PMT) within the CR system?
• Which of the following spatial frequencies would produce the greatest spatial resolution?
• Which of the following best describes the role of the ADC in CR systems?
• Cesium Iodide is the preferred material for the scintillation layer because it can be formed into:
• The storage capacitor of the detector element (DEL) stores which of the following?
• An x-ray photon is absorbed with the phosphor layer of a CR plate through what type of interaction?
• What occurs to the imaging plate as soon as it is inserted into the CR reader?
• What is the role of a PACS (Picture Archiving and Communication System)?
• What is meant by "dynamic range" in digital imaging?
• What is the role of image storage in digital radiography?
• How is radiation dose measured in digital radiography?
• How do software updates benefit digital radiography systems?
• How does image post-processing in digital radiography differ from film radiography?
• What is the term used to describe the ability of an x-ray imaging system to capture a wide range of exposure values?
• What is the relationship between spatial frequency and the Modulation Transfer Function (MTF)?
• What type of noise cannot be reduced in digital radiography?
• Which of the following factors influences Modulation Transfer Function (MTF)?
• How does the matrix size influence the image quality in radiography?
• What is the effect of a higher bit depth on a digital radiograph?
• When compared to computed radiography (CR), digital radiography (DR) is:
• How does scatter radiation impact digital radiographic images?
• What do "image artifacts" refer to in digital radiography?
• What is the main function of an Automatic Exposure Control (AEC) system in digital radiography?
• What advantage does digital fluoroscopy provide compared to traditional fluoroscopy?
• How many shades of gray can be displayed by an 8-bit digital radiography system?
• Which configuration will produce the highest spatial resolution in radiography?
• In digital radiography, which factor primarily affects the image quality?
• Which of the following technologies is commonly used in digital radiography systems for image acquisition?
• The phosphor layer of the computed radiography (CR) imaging plate is primarily composed of which materials?
• The term "latent image" is used to describe the:
• What is the primary function of the scintillation layer in a flat-panel detector?
• How does image stitching work in digital radiography?
• Which component is critical for converting light signals into electronic signals in digital radiography systems?
• What does insufficient exposure in a digital image primarily affect?
• How is spatial frequency related to pixel size?
• What is the main difference between direct and indirect digital radiography?
• How is the sensitivity of a digital detector measured?
• What term describes the ability to produce quality radiographs at a wide range of technical factors?
• If the pixel size is 0.03 mm, what is the calculated spatial frequency?
• Which of the following is a characteristic of a photodiode in the context of digital radiography?
• Detective Quantum Efficiency (DQE) is an actual number represented in a percentage. Which percentage below would be considered the highest DQE?
• What is the smallest exposure difference that can be detected and displayed by the imaging system?
• What role does the technician have in the quality assurance of digital radiography?
• Which of the following is a primary benefit of using digital radiography over traditional film?
• In terms of imaging systems, what does a higher matrix size typically imply?
• What does the term "windowing" refer to in digital imaging?
• What does higher bit depth in digital imaging correspond to?
• What type of technology is primarily used in digital radiography systems to capture images?
• What type of artifact may occur due to improper sampling of a digital image?
• What are the small elements that comprise the digital image receptor called?
• A technologist accidentally uses a lower mAs than appropriate on a radiograph of the chest. What digital process is used to display the image as if the image receptor was exposed correctly?
• When should a computed radiography (CR) imaging plate be processed to avoid losing the latent image?
• Which adjustment is preferred when radiographic grids are used to reduce scatter?
• What does DICOM stand for, and why is it significant in digital radiography?