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Physics 3 > Test 2 > Flashcards

Test 2 Flashcards

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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:

A

Bit

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
Q

____________ is the range of exposures a system can retain to create the visible image

A

Dynamic Range

26
Q

___________ is the number of bits used to reproduce image gray levels

A

Bit Depth

27
Q

The bit number is always expressed as the exponent of:

A

2

28
Q

An 8 bit pixel is equal to:

A

2^8 (256)

29
Q

In CT the numeric value of each pixel is a CT number, or __________

A

Hounsfield Unit

30
Q

The diameter of image reconstruction is called the:

A

Field of View

31
Q

For the same field of view the spatial resolution will be better with a _________ image matrix

A

Larger

32
Q

Spatial Resolution = —?—- / —?—

A

FOV / Matrix

33
Q

This is the same formula as ___________, since spatial resolution is determined by the number of pixels and the matrix size.

A

Pixel Size

34
Q

Where is the latent image in computed radiography formed?

A

In the photostimulable phosphor

35
Q

The optical mirror in the reader does what?

A

Directs the laser beam to the imaging plate surface

36
Q

What is the device that changes the electrical signal created from the light released from the CR imaging plate into digital data?

A

Analog to digital converter

37
Q

Before being reused, the imaging plate is _______

A

Exposed to intense light

38
Q

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

A

Histogram

39
Q

The phosphor layer is made of phosphors from the ________ family

A

Barium Flurohalide

40
Q

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

A

Algorithms

41
Q

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

A

It increases

42
Q

The range of exposure intensities an image receptor can accurately detect determines its:

A

Dynamic Range

43
Q

The reflective layer does what?

A

Sends light in a forward direction

44
Q

Pixel pitch refers to the:

A

Center from the pixel to pixel

45
Q

The layer of the imaging plate that traps electrons during exposure is the ________ layer

A

Active

46
Q

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

A

Spatial Resolution

47
Q

Image noise in the digital imaging is primarily the result of:

A

Quantum Mottle

48
Q

The numeric value of the pixel which represents the brightness of the image at a particular location is known as:

A

Quantization

49
Q

As a descriptor of a photostimulable phosphor, the term turbid refers to the appearance of:

A

Cloudy

50
Q

The frequency at which the analog sample is taken is known as:

A

Sampling frequency

51
Q

Spatial resolution in CR is principally determined by:

A

Laser beam diameter

52
Q

How does the computed radiography reader maintain the laser beam?

A

Beam-shaping optics

53
Q

The highest spatial frequency that can be recorded by a digital detector is known as:

A

Nyquist frequency

Physics 3 (1 decks)

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