Digital Radiography Multiple Choice Quizlet

What term describes the range of exposures that may be captured by a detector, (Number of gray shades that an imaging system can produce)?

A. Dynamic Range

B. Bit Depth

C. Exposure Latitude

D. Raw Data

A. Dynamic Range

What is exposure information called before any processing algorithms are applied?

A. Quantization

B. Histogram

C. Raw Data

D. Latent Image

C. Raw Data

What is a graphical representation of pixel intensity distribution in a digital image?

A. Histogram Analysis

B. Look-Up Table (LUT)

C. Values of Interest (VOI)

D. Histogram

D. Histogram

(Also frequency of recorded exposure values. Each anatomical setting on the control panel has one.)

What process compares the exposure produced to a pre-established histogram for the anatomic part?

A. Histogram Analysis

B. Automatic Rescaling

C. Flat Fielding

D. Quantization

A. Histogram Analysis

What process assigns a value to a dead pixel based on adjacent pixel values?

A. Dead Pixel Correction

B. Flat Fielding

C. Edge Enhancement

D. Smoothing

A. Dead Pixel Correction

What preprocessing calibration technique makes the image receptor response uniform?

A. Dead Pixel Correction

B. Automatic Rescaling

C. Flat Fielding

D. Windowing

C. Flat Fielding

(Dead pixels are removed from the matrix by making a mask over the dead pixels)

What is an invisible image waiting to be processed?

A. Annotation

B. Histogram

C. Latent Image

D. Raw Data

C. Latent Image

What term describes the number of shades of gray available to define each pixel?

A. Quantization

B. Bit Depth

C. Window Width

D. Dynamic Range

B. Bit Depth

(When this number is increased, more information is included on the radiograph, 8 = 256 shades of gray)

What process assigns each pixel a number with an assigned grayscale value during ADC?

A. Image Inversion

B. Histogram Analysis

C. Bit Depth

D. Quantization

D. Quantization

What determines the range of histogram data that should be included in the displayed image?

A. Dynamic Range

B. Region of Interest (ROI)

C. Look-Up Table (LUT)

D. Values of Interest (VOI)

D. Values of Interest (VOI)

What series of mathematical equations determines brightness and contrast during digital image processing?

A. Look-Up Table (LUT)

B. Automatic Rescaling

C. Values of Interest (VOI)

D. Histogram

A. Look-Up Table (LUT)

What software function produces consistent (uniform) brightness and contrast and can correct small exposure errors?

A. Smoothing

B. Windowing

C. Automatic Rescaling

D. Histogram Analysis

C. Automatic Rescaling

(Modifies the histogram and makes it look how the computer thinks it is supposed to look)

What post-processing ability allows a technologist to alter brightness and contrast?

A. Shuttering

B. Windowing

C. Quantization

D. Stitching

B. Windowing

Which control adjusts image brightness during post-processing?

A. Wide Window Width

B. Window Width

C. Window Level

D. Narrow Window Width

C. Window Level

Which control adjusts image contrast during post-processing?

A. Window Level

B. Window Width

C. Exposure Latitude

D. Dynamic Range

B. Window Width

What processing algorithm increases contrast along the edges of anatomical structures?

A. Smoothing

B. Image Subtraction

C. Edge Enhancement

D. Shuttering

C. Edge Enhancement

What process masks quantum noise and is also called noise suppression or low-pass filtering?

A. Flat Fielding

B. Image Inversion

C. Smoothing

D. Edge Enhancement

C. Smoothing

(If set too high it can cause loss of spatial resolution)

What error produces a halo effect from excessive edge enhancement settings?

A. Quantum Noise

B. Histogram Error

C. Dead Pixel Correction

D. Edge Enhancement Error

D. Edge Enhancement Error

Which window width produces short-scale or high contrast?

A. Wide Window Width

B. Dynamic Range

C. Narrow Window Width

D. Window Level

C. Narrow Window Width

Which window width produces long-scale or low contrast?

A. Wide Window Width

B. Narrow Window Width

C. Bit Depth

D. Window Level

A. Wide Window Width

What application removes white borders around a digital image?

A. Stitching

B. Shuttering

C. Electronic Cropping or Masking

D. Annotation

B. Shuttering

What post-processing tool selects a specific area of an image for enhancement or brightening?

A. Histogram Analysis

B. Values of Interest (VOI)

C. Region of Interest (ROI)

D. Shuttering

C. Region of Interest (ROI)

(A square shape is used to indicate the area that needs to be enhanced or brightened)

What process is used in interventional radiology to remove overlying bone so blood vessels can be better visualized?

A. Image Inversion

B. Edge Enhancement

C. Image Subtraction

D. Stitching

C. Image Subtraction

(Can be used to look for blockages or obstructions)

What process connects two images together, such as in scoliosis imaging?

A. Annotation

B. Image Subtraction

C. Stitching

D. Shuttering

C. Stitching

What term describes electronic collimation performed during post-processing?

A. Windowing

B. Electronic Cropping or Masking

C. Shuttering

D. Region of Interest (ROI)

B. Electronic Cropping or Masking

What processing application reverses black and white colors and may help visualize tubes or lines?

A. Image Inversion

B. Edge Enhancement

C. Automatic Rescaling

D. Image Subtraction

A. Image Inversion

What term describes the range of exposures that can still produce an acceptable-quality image?

A. Bit Depth

B. Dynamic Range

C. Window Width

D. Exposure Latitude

D. Exposure Latitude

(The extent to which radiographs can be over or under exposed and still achieve an acceptable result)

What term means writing or adding labels/text on an image?

A. Quantization

B. Stitching

C. Shuttering

D. Annotation

D. Annotation