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Physics 3 > Test 2 > Flashcards

Test 2 Flashcards

1
Q

What is the name of an image constructed from numerical information?

A

Digital Image

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2
Q

What is the display of the digital image that occurs in a series of rows and columns called?

A

Matrix

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3
Q

What is the matrix of the digital image composed of?

A

Pixels

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4
Q

Which imaging method is difficult to use for mobile radiology?

A

DR

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5
Q

The basic unit of information in a computer is a:

A

Bit

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6
Q

What is the graphical display of the pixel values during digital radiography known as?

A

Histogram

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7
Q

With digital imaging, using twice the needed mAs will result in an image with _______ density/brightness and _______ patient exposure.

A

Appropriate, Excessive

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8
Q

Which imaging method requires the shortest time from exposure to image viewing?

A

DR

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9
Q

What are the mathematical calculations used for image construction of specific examinations called?

A

Algorithms

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10
Q

When the image matrix size is increased, resulting in a decreased pixel size, what happens to spatial resolution?

A

It Increases

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11
Q

Which imaging method has the greatest spatial resolution?

A

Film-screen

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12
Q

A significant advantage of digital compared to film-screen radiography is:

A

Postprocessing image enhancement

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13
Q

Which of the following matrix sizes would produce the best image quality? (A) 64x64 (B) 256x256 (C) 1024x1024 (D)2048x2048

A

D - 2048x2048

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14
Q

The pixel bit depth determines the amount of shades of gray the system is capable of displaying on the digital image. (T/F)

A

True

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15
Q

If a digital image is produced using one half of the appropriate mAs, the image will have:

A

Appropriate density/brightness, AND Quantum mottle

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16
Q

Increasing the number of pixels in the image matrix will increase:

A

Spatial Resolution

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17
Q

Which one of the following digital systems would have the best image quality? (A) 8 bit (B) 12 bit (C) 16 bit (D) 32 bit

A

D - 32 bit

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18
Q

The x-ray beam exiting the patient has the capability of producing over ________ shades of gray.

A

1000

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19
Q

Computer operates in the _________ system even though it can accept and report alphabetic characters and numeric info.

A

Binary

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20
Q

______________ is needed to convert analog input into digital data for processing (converts analog signal into sequence of numbers)

A

ADC (Analog to digital converter)

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21
Q

____________ converts digital info back into analog signals so that it can be interpreted by analog display device such as a TV monitor.

A

DAC (Digital to analog converter)

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22
Q

Each binary number, or binary digit is called a:

23
Q

Transfer of images and patient reports to remote sites is known as:

A

Teleradiology

24
Q

This assigning of a unique value to each pixel is known as:

A

Quantization

25
____________ is the range of exposures a system can retain to create the visible image
Dynamic Range
26
___________ is the number of bits used to reproduce image gray levels
Bit Depth
27
The bit number is always expressed as the exponent of:
2
28
An 8 bit pixel is equal to:
2^8 (256)
29
In CT the numeric value of each pixel is a CT number, or __________
Hounsfield Unit
30
The diameter of image reconstruction is called the:
Field of View
31
For the same field of view the spatial resolution will be better with a _________ image matrix
Larger
32
Spatial Resolution = ---?---- / ---?---
FOV / Matrix
33
This is the same formula as ___________, since spatial resolution is determined by the number of pixels and the matrix size.
Pixel Size
34
Where is the latent image in computed radiography formed?
In the photostimulable phosphor
35
The optical mirror in the reader does what?
Directs the laser beam to the imaging plate surface
36
What is the device that changes the electrical signal created from the light released from the CR imaging plate into digital data?
Analog to digital converter
37
Before being reused, the imaging plate is _______
Exposed to intense light
38
What is the graphical display of the pixel values during digital radiography known as?
Histogram
39
The phosphor layer is made of phosphors from the ________ family
Barium Flurohalide
40
What are the mathematical calculations used for image construction of specific examinations called?
Algorithms
41
When the image matrix size is increased, resulting in a decreased pixel size, what happens to spatial resolution?
It increases
42
The range of exposure intensities an image receptor can accurately detect determines its:
Dynamic Range
43
The reflective layer does what?
Sends light in a forward direction
44
Pixel pitch refers to the:
Center from the pixel to pixel
45
The layer of the imaging plate that traps electrons during exposure is the ________ layer
Active
46
Increasing the number of pixels in the image matrix will increase:
Spatial Resolution
47
Image noise in the digital imaging is primarily the result of:
Quantum Mottle
48
The numeric value of the pixel which represents the brightness of the image at a particular location is known as:
Quantization
49
As a descriptor of a photostimulable phosphor, the term turbid refers to the appearance of:
Cloudy
50
The frequency at which the analog sample is taken is known as:
Sampling frequency
51
Spatial resolution in CR is principally determined by:
Laser beam diameter
52
How does the computed radiography reader maintain the laser beam?
Beam-shaping optics
53
The highest spatial frequency that can be recorded by a digital detector is known as:
Nyquist frequency

Physics 3 (1 decks)

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