RTBC Fundamentals of Digital Radiography Practice Test

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• Increasing the matrix size from 1024 x 1024 primarily affects which image attribute?
• How does exposure latitude in digital radiography compare with film-screen imaging, and what practice helps mitigate dose creep in DR?
• The latent image concept in computed radiography describes which of the following?
• If the field of view is 10 cm and the matrix size is 200, what is the pixel size in cm?
• During digital image formation, quantization occurs at which device?
• The primary function of the ADC within the CR IP reader/digitizer is to convert:
• Which factors influence magnification and geometric distortion in radiography, and how can you minimize distortion?
• If detector uniformity fails QA, what artifact might appear on the image?
• In digital radiography, which statement correctly distinguishes direct-conversion detectors from indirect-conversion detectors?
• For pediatric imaging in DR, what adjustments reduce dose while maintaining diagnostic quality?
• Signal-to-noise (SNR) is increased when which condition is used?
• The storage capacitor of the DEL stores which type of charge?
• What formula is used to calculate spatial frequency from pixel size in CR imaging?
• How does patient positioning affect the appearance of motion artifacts and overall image quality in DR?
• In CR IP, the purpose of the storage capacitor within the DEL is to:
• Which strategy best minimizes dose while preserving diagnostic quality for a chest radiograph in DR?
• Calculate the pixel size given these variables: Matrix size = 512 x 512; FOV = 12 cm.
• The detector exposure range of 1 µGy to 1000 µGy corresponds to which concept?
• Which would lead to an increase in patient dose?
• Which spatial frequency would produce the greatest spatial resolution?
• High DQE radiographs exhibit which combination of signal and noise?
• What is the role of the photomultiplier tube (PMT) within the CR system?
• Which layer of the CR imaging plate is responsible for creating the latent image from transmitted x-ray photons exiting the patient?
• What is the purpose of histogram equalization in DR post-processing?
• The storage capacitor of the DEL stores which type of electrical charge?
• Which interaction is most associated with the absorption of diagnostic X-rays by a phosphor layer in radiography?
• Which interaction is responsible for x-ray absorption in the phosphor layer of a CR plate, among the listed options?
• What display monitoring within a PACS workflow primarily supports QA?
• In a CCD system, the scintillation layer is connected to the CCD sensor chips by which means?
• What is a likely clinical consequence of having a wide dynamic range in a DR detector?
• Which processing step comes first in exposure correction?
• Which layer of a CR imaging plate prevents unwanted light and background radiation from affecting the unprocessed latent image?
• Which of the listed radiographic matrices would produce the greatest spatial resolution?
• What is the purpose of geometric accuracy QC in DR imaging?
• Detective Quantum Efficiency is a:
• In DR workflow, which statement correctly describes the difference between CR and DR?
• What is the term for the percentage of the DEL that is devoted to the detection layer?
• The digital image receptor is comprised of small elements called
• What is the purpose of the backup timer in automatic exposure control (AEC) systems?
• In DR, how does focal spot size affect spatial resolution and patient dose?
• In digital radiography, increasing pixel bit depth primarily increases the number of grayscale steps available in the image.
• Which practice helps prevent incorrect histogram rescaling and LUT adjustments by ensuring proper exposure monitoring?
• Spatial frequency is best described as which of the following?
• What is the device called that transfers the latent image from the imaging plate to a viewable digital radiograph?
• How does PACS digital workflow influence QA practices in DR?
• What is the role of beam-limiting devices (collimators) in DR, and what is the effect of misalignment?
• Which set of elements makes up the capture area of a direct conversion detector (DEL)?
• What is the name of the conductive layer on a CR plate?
• Which change will increase the contrast resolution of a digital radiographic system?
• CsI scintillation layer uses a columnar structure to focus which type of photons?
• What is the Modulation Transfer Function (MTF), and why is acquiring a higher MTF preferable for diagnostic performance?
• In DR, what is the relationship between SNR and CNR?
• In digital radiography, what is the primary purpose of a look-up table (LUT)?
• Which factor would produce a radiographic image with the highest spatial resolution?
• What is the typical role of Automatic Exposure Control (AEC) in DR, and what common errors can degrade image quality?
• In direct capture flat-panel detectors, which material directly converts x-ray energy into electrical charge?
• The conductor layer within the CR IP is responsible for which of the following?
• What does exposure index accuracy QC ensure?
• Why must clinicians exercise caution when comparing exposure index values across different DR manufacturers?
• DQE is directly related to which factor?
• When should a CR IP be processed to prevent loss of the latent image?
• In radiographic imaging phosphor layer, which interaction is primarily responsible for absorbing diagnostic x-ray photons?
• What effect does a wide dynamic range have on the visualization of bone and soft tissue in digital radiography (DR)?
• Exposure latitude is the ability to produce quality radiographs across a wide range of technical factors.
• Which material is commonly used as a photoconductor in direct-conversion DR detectors?
• Which description best defines the dynamic range in digital radiography?
• From the sequence 0.6, 0.8, 1.0, 0.7, which value is the highest?
• Amorphous Selenium is used in which imaging system?
• Which option reflects when to replace DR receptors due to QA checks?
• Why calibrate monitor luminance and ambient lighting in digital radiography, and how is it performed?
• Which device may be used in place of the photomultiplier tube (PMT) within a CR image reader system?
• What are typical imaging receptor lifecycles and when should plate cleaning or replacement occur?
• Quantization is a digital radiography process through which receptor readings are:
• Which element used in a flat-panel detector is able to convert x-ray photons directly into an electrical signal?
• Within a digital radiography matrix, what does 1024 x 1024 refer to in imaging terms?
• Which statement correctly identifies a common DR artifact and its mitigation?
• Dynamic range is defined as the range of exposure values that can be captured by a detector.
• How many shades of gray can be displayed by an 8-bit digital radiography system?
• From the values 0.6, 0.7, 0.8, 1.0, identify the largest value.
• Within a flat-panel detector, which device acts as the switch to release the collected charge?
• Compared to computed radiography (CR), digital radiography (DR) is
• Which statement correctly describes the role of bit depth in digital imaging?
• Which of the following components is not utilized for CR systems?
• Which statement best describes the effect of using a grid on radiographic image quality?
• What do window level and window width control in DR image display, and how should they be used to optimize visualization of a chest radiograph?
• What factors influence spatial resolution in DR, and how is pixel pitch related to the Nyquist frequency?
• List two essential components of a DR QA program and briefly describe their purpose.
• Which processing step is primarily responsible for mapping pixel values to display brightness levels?
• What is the purpose of the laser within the CR digitizer?
• Describe the impact of grid ratio on image quality and patient dose in DR.
• Automatic rescaling in DR can affect longitudinal image comparisons by...
• DQE is an actual number represented in a percentage. Which percentage below would be considered the highest DQE?
• DQE stands for Detective Quantum Efficiency.
• Which statement about magnification and spatial resolution in DR is true?
• What happens when a CR imaging plate is exposed to white light?
• What does Dose Area Product (DAP) measure, and how is it used in patient dose assessment?
• Which term describes the amount of photons absorbed by the detector?
• Which interaction is responsible for the absorption of x-ray photons in the phosphor layer of CR imaging?
• LUT determines brightness/contrast and each body part has a different LUT. What is the primary role of a LUT?
• Which dose metric is used for population risk estimates in DR?
• What is the relationship between spatial frequency and MTF?
• Which interaction is primarily responsible for x-ray absorption in the phosphor layer of a radiography plate?
• In a flat-panel detector, which component acts as a switch to read charge from detector elements (DELs) and route it to the readout electronics?
• Which component of an indirect capture flat-panel detector converts incident x-ray photons into visible light photons?
• What distinguishes raw image data from the processed display image in DR?
• Which approach to increasing the signal may lead to an increase in scatter reaching the image receptor?
• Explain the concept of automatic rescaling and how it affects longitudinal image comparisons in DR.
• The readout of the DEL array is controlled by which component?
• What is the Moire effect, and why is it a concern with digital detectors using certain grids?
• Motion affects MTF curves in digital radiography. Which statement best describes its effect and detection method?
• An x-ray photon absorbed in the phosphor layer of a computed radiography plate occurs through which interaction?
• The thin, active layer within a CR cassette stores which of the following?
• Exposure latitude is defined as the:
• What part of a digital detector element detects radiation?
• In a chest radiography scenario where two exams of the same patient used different technique settings but both produced acceptable exposure indicators, this demonstrates which concept?
• Exposure latitude is best described as the ability to produce quality radiographs across a wide range of technical factors.
• Processing a tib-fib radiograph as an abdomen may result in which of the following?
• Cesium iodide scintillation layer is preferred because its structure focuses which type of photons?
• What is the smallest exposure difference that can be detected and displayed by the imaging system?
• What is the purpose of a QA phantom in DR imaging, and which metric is commonly evaluated with it?
• What is DICOM and why is it essential in DR workflows?
• In the context of CR plate physics, absorption of x-ray photons in the phosphor layer occurs via which interaction?
• Which statement describes how high DQE affects exposure?
• In digital radiography, saturation artifact occurs when exposure exceeds the system's dynamic range, causing:
• Which digital process is applied after rescaling to adjust overall brightness/contrast following slight under- and over-exposure errors?
• Dexels are described as being part of which structure inside the imaging receptor?
• Which action can help reduce the system noise in digital radiography?
• Which of the following lp/mm selections would represent the highest spatial frequency?
• How does thoracic projection and patient size influence dose and image quality in DR?
• What is a potential limitation of post-processing in DR for high-contrast detail perception?
• In the scenario of upright bucky versus table bucky, the most likely source of the increased noise is:
• Which statement best describes high DQE?
• Which of the listed radiographic matrices will create the image with the smallest pixels?
• If the detector's matrix size increases while the field of view remains constant, what happens to pixel pitch?
• What does IP stand for in CR imaging?
• Why is beam quality (kVp) important in DR for maintaining patient dose and image contrast?
• Which of the following factors influences MTF?
• What is the purpose of using a standardized technique chart in DR chest imaging?
• In the sequence 0.6, 0.7, 0.8, 1.0, which number is the greatest?
• Which of the following makes up a single DEL?
• Calculate the spatial frequency if the pixel size is 0.03 mm. spatial frequency = 1/(2 x pixel size)
• What term describes the detector's ability to detect a range of exposure values?
• Which QC test is commonly used in digital radiography to assess detector uniformity across the image field?
• Dynamic range in radiographic imaging is defined as the range of exposures that can be captured by an IR.
• Photons that add information but do not represent anatomical structures are considered:
• PSP stands for Photostimulable Phosphor.
• Which factor most directly controls the brightness levels displayed in a digital radiography image?
• Out of the listed spatial frequencies, which would represent the highest Modulation Transfer Function (MTF) score?
• Which CR IP layer provides physical support and durability to the plate?
• In the following MTF value sequence, which value is the highest?
• Images with different mAs but all producing exposure indicator values within the acceptable range illustrate which concept?
• What is the role of histogram analysis in DR post-processing, and what happens if the histogram is truncated or contains outliers?
• Which interaction is involved in absorbing diagnostic x-ray photons by the phosphor layer in radiographic imaging, among the options?
• How do DR exposure index values differ across manufacturers, and what is their clinical value?
• What is SNR and CNR in DR and how do they influence image quality?
• MTF stands for Modulation Transfer Function.
• In the radiographic histogram, the Y-axis represents which of the following?
• Flat-panel detector systems typically use a thin-film transistor (TFT). This device functions to
• Which of the following factors influence the grayscale of a digital radiograph?
• Which term describes a blotchy appearance caused by insufficient photons reaching the imaging receptor?
• Final digital images do not display exposure indicators (EIs); brightness is used to assess IR exposure; why is this poor practice?
• What best describes the dynamic range of a digital radiography detector?
• In CR imaging, which statement best describes the remnant-beam signal?
• Which guidelines help minimize motion and dose in pediatric chest radiography?
• Which bit depth enables the greatest amount of anatomical information to be displayed in a digital radiography image?
• What does pixel bit depth determine in a DR image, and how does it affect grayscale dynamic range?
• Aliasing in DR imaging and how can it be prevented?
• Most common CR IP readers contain which of the following?
• Ambient noise in radiographic imaging is defined as which?
• A histogram in digital radiography refers to the:
• Which MTF score indicates that an image perfectly represents the object in both spatial resolution and contrast?
• What is the smallest controllable element of a digital image called?
• Bit depth is defined as the:
• An x-ray exposure above the highest level of the exposure latitude may result in an error called:
• Which configuration will yield the highest spatial resolution?
• What units are used to express spatial frequency?
• Which processing step is used to adjust brightness and contrast of a digital image?
• Consider an x-ray exposure results in a receptor exposure of 0.001 uGy. The resulting image is expected to display which of the following?
• Why is it important to maintain consistent EI/S numbers across serial DR exams?
• The phosphor layer of the CR IP is composed of which materials?
• Quantum mottle is observed as what in DR images?
• Acquiring an optimal wrist image at 60 kVp and 2.5 mAs, and then using 72 kVp and 5 mAs for the same projection, will result in which of the following?
• In DR systems, what does the exposure indicator (EI) represent and how should it be used to adjust technique?
• To reduce pixel size while keeping the field of view constant, you should:
• What is the role of detector exposure indices (EI) or S numbers in DR systems, and why is consistency important?
• Which statement correctly describes how z-axis magnification depends on SID and OID and its effect on spatial resolution and dose?
• Which term describes the digital matrix of the image file?
• Decreasing beam energy has what effect on photon absorption and DQE?
• In a radiographic histogram, which axis shows how often brightness values occur?
• In a fixed field of view, increasing matrix size from 512x512 to 2048x2048 results in what?
• What is the primary reason for using higher technique in larger patients or oblique projections?
• Which detector component converts x-rays to light?
• Which process corrects slight under- and over-exposure errors made by the tech?
• In an indirect capture flat-panel detector, which component converts the visible light into electrons?
• Which AEC-related issue can degrade image quality during radiography?
• During digital image formation and processing, quantization takes place in which device?
• Which parameter does NOT influence the spatial resolution of a digital radiograph?
• In DR, which statement accurately describes the function of DICOM within imaging workflows?
• The MTF evaluates the:
• Which statement best distinguishes ESD, DAP, and effective dose in dose assessment?
• Which change increases the detective quantum efficiency (DQE) of an imaging system?
• Which statement best describes the role of DICOM in radiographic imaging?
• Which type of noise cannot be reduced?
• Which action will reduce pixel size without changing the field of view?
• In a CR phosphor layer, which interaction is responsible for absorbing diagnostic x-ray photons?
• What device reads the latent image from a CR IP by scanning with a laser in a raster pattern?
• Which of the following is created on an image receptor by the arrangement of DELs into rows and columns?
• Doubling the matrix size with a fixed field of view will:
• In indirect DR detectors, what is the role of the photodiode array?
• What is the relationship between fill factor and spatial resolution?
• Which step in digital image processes identifies the useful exposure values in raw image data?
• If a DR image shows grid cutoff due to misalignment, what is the recommended first corrective action?
• MTF is also referred to as which of the following?
• In CR systems, which item is not typically utilized?
• When radiographic grids are used to reduce scatter, which adjustment is typically preferred?
• What occurs to the imaging plate as soon as it is inserted into the CR reader?
• In the radiographic histogram, the X-axis represents which of the following?
• Which material is responsible for storing the latent image within the CR IP?
• Which action is the correct first step when grid alignment is suspected as causing grid cutoff?
• Net image receptor dose and patient skin dose differ in what way?
• Which QA activity ensures consistent image quality across exams in DR?
• What is off-center exposure or off-level grid error and how does it appear on radiographs?
• In direct capture detectors, which statement is true about amorphous selenium (A-Se)?
• Which dose metrics are used to assess patient dose, and which metric is used for population risk estimates?
• Which of the following would decrease the DQE?
• What term describes photons that contribute to image brightness but do not convey anatomical details?
• Increasing kVp generally has what effect on DQE?
• Which tech error is most likely to result in incorrect histogram rescaling and LUT adjustment?
• A tech uses lower mAs than appropriate; which digital process displays the image as if the IR was exposed correctly?
• What is the function of a look-up table (LUT) in DR image processing?
• What is the role of an analog-to-digital converter (ADC) in digital radiography?
• In CR imaging, the latent image known as the stored image is held in which layer of the imaging plate?
• In DR, what is the function of automatic exposure control (AEC)?
• Which component releases the collected charge from a detector element in a flat-panel detector?
• Photon is synonymous with which term?
• Which interaction is most commonly associated with the absorption of diagnostic x-rays by a phosphor layer used in radiography?
• Which statement best describes histogram analysis in the absence of exposure indicator information?
• In the sequence 0.6, 0.7, 0.8, 1.0, which option shows the maximum value?
• Which processing step is used to adjust brightness and contrast after histogram analysis?
• Dose creep is the gradual increase in patient dose due to overreliance on automatic systems and practice drift. How can it be prevented?