Term
| Computers are typically classified according to what 3 characteristics? |
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Definition
1. Size
2. Processing speed
3. Storage capacity |
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Term
| Computer memory is distinguished from computer storage by its ________. |
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Definition
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Term
| Memory is ______, while storage is _______. |
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Definition
memory = active
storage = archival |
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Term
| All data processed by the computer pass through the ____ ______. |
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Definition
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Term
| What are the most common output devices? |
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Definition
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Term
| When rows and columns of pixels are combined they form a ______. |
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Definition
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Term
| ____ is what is put into a the computer, and ___________ is what is gotten out. |
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Definition
Data - put in
Information - what is gotten out |
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Term
| _______ is the capacity to retrieve data that has been previously stored. |
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Definition
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Term
| The introduction of what two things made DR possible? |
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Definition
1. advanced microprocessors
2. semiconductor memory |
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Term
| CR uses a what as the image receptor? |
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Definition
| a photostimulable phosphor |
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Term
| (True or False) The numeric value of the pixel also has a relationship to the composition of the tissue imaged. |
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Definition
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Term
| The larger the matrix size, the _______ the resulting image. |
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Definition
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Term
__________________ is the process of capturing remnant energy from an imaging device, i.e., an x-ray machine, and transforming this energy into electrical signals that are measured by detectors and assigned discreet values (digits) that are processed, stored, and displayed by computers.
a. Digital Processing
b. Digital Imaging
c. Digital Image Acquisition
d. Direct Capture Radiography |
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Definition
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Term
What is the first step in digital imaging?
a. Positioning the patient
b. Determining the image matrix
c. Capturing the x-ray energy and transforming it into electrical signals
d. Transforming the latent image into a manifest analog image that can be viewed by the human eye |
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Definition
| c. Capturing the x-ray energy and transforming it into electrical signals |
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Term
What determines the size of the image matrix?
a. The amount of RAM on the system
b. The characteristics of the imaging equipment
c. The capacity of the computer
d. a and c
e. b and c
f. a and b |
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Definition
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Term
What determines spatial resolution for a digital image?
a. The size of the image matrix and the line pairs per millimeter
b. The field of view and the line pairs per millimeter
c. The size of the image matrix and the field of view
d. The field of view and the dynamic range |
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Definition
| c. The size of the image matrix and the field of view |
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Term
Using the computer to change the appearance of an image after exposure is known as:
a. Leveling
b. Window Width
c. Windowing
d. Window & Leveling |
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Definition
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Term
Which image enhancement modifies the gray scale rendition of the image, and therefore the image contrast?
a. Leveling
b. Window Width
c. Windowing and Leveling
d. Subtraction |
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Definition
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Term
___________ is the process of selecting some segment of the total pixel value range (the wide dynamic range of the receptors) and then displaying the pixel values withing that segment over the full brightness (shades of gray) range from white to black.
a. Subtraction
b. Leveling
c. Windowing
d. Windowing and Leveling |
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Definition
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Term
| The latent image in CR consists of ______ _______ stored in high-energy traps. |
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Definition
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Term
| The laser beam (CR processing) causes the trapped electrons to return to the ______ ____ with emission of _____ light. |
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Definition
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Term
| The violet light given off during CR processing is viewed by an ultra sensitive _________ ____, which emits an ________ signal proportional to the amount of violet light it sees. |
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Definition
| photomultiplier tube, electric |
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Term
| CR is characterized by an extremely wide latitude and linear response, resulting in _______ levels of gray, all of which can be evaluated visually by post-processing. |
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Definition
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Term
| What controls image density in CR? |
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Definition
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Term
| In direct conversion DR, the _____-___ ____ is the signal that charges the AMA of TFTs. |
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Definition
| electron-hole pairs (EHPs) |
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Term
Digital images acquired using a/an __________ __________ as a solid-state image receptor in rectangular plate form is termed "Computed Radiography" or "CR".
a. Photostimulable Device
b. Photostimulable Phosphor
c. Photostimulable Screen
d. Amerisium-Activated Fluorohalide |
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Definition
| b. Photostimulable Phosphor |
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Term
The prime influence on contrast in CR comes from the _________ _________.
a. mAs response
b. Lookup Tables
c. kVp response
d. Tube Filtration |
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Definition
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Term
DQE, and therefore patient dose, is determined principally by the _________ _________ of the detector.
a. Atomic Number
b. Atomic Weight
c. Pixel Size
d. Fill Factor |
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Definition
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