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Rad Technique > Digital Imaging Processing > Flashcards

Digital Imaging Processing Flashcards

0
Q

Deals with an image which is composed of many image points

A

Digital Image Processing

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1
Q

Technology of applying a number of computer algorithms to process digital images

A

Digital image processing

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2
Q

Main purpose of processing

A

Allow to obtain an imahe of high quality or descriptive characteristics of the original image

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3
Q

Generated from continuous function, required for human viewing

A

Analog images

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4
Q

Numerical representation of the patient

A

Digital image

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5
Q

Related to brightness or color

A

Pixel value

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6
Q

Two domains

A

Spatial location

Spatial frequency

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7
Q

An image is described using right handed x-y coordinates

A

Spatial location domain

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8
Q

Images are acquired and described according to tge wavelength of the signal

A

Spatial frequency domain

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9
Q

Digitizing an image

A

Scanning
Sampling
Quantization

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10
Q

Image is divided into array of pixels

A

Scanning

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11
Q

Brightness level of each pixel is measured by PMT

A

Sampling

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12
Q

Process where the brightness levels obtained through sampling are assigned

A

Quantization

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13
Q

Integer

A

Gray level

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14
Q

Total number of gray level

A

Gray scale

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15
Q

Quantization occurs in

A

Analog digital converter

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16
Q

Divides the analog signal into equal parts depending on its bit capacity

A

Analog digital converter

17
Q

Generate image that is more pleasing to the observer

A

Image enhancement

18
Q

To improve the quality of images ggat have distortion or degradations

A

Image restoration

19
Q

Allows measurements and statistics to be perform

A

Image analysis

20
Q

To reduce the size of the image in order

A

Image compression

21
Q

2 types of compression

A

Lossy

Lossless

22
Q

Some loss image when decompressed

A

Lossy

23
Q

No loss of information when decompressed

A

Lossless

24
Q

Creates images from other images pr non images data

A

Image synthesis

25
Q

Concepts of dogital imaging processing

A

Point processing operation
Local processing operation
Global processing operation
Geometric operation

26
Q

Most frequent and simple used operation in digital diagnostic imaging

A

Point processing operation

27
Q

3 methods of point processing

A

Histogram
Look up table
Windowing

28
Q

Graph of number of pixels in the entire image

A

Histogram

29
Q

Determines the number assigned to input pixel values

A

Look up table

30
Q

Range of numbers, controls image contrast

A

Window width

31
Q

Center of the range, controls brightness of tge image

A

Window level

32
Q

Uses window width and window level

A

Windowing

33
Q

The output image pixel value is obtained from a small area of pixels. It makes use of the image domains

A

Local processing operation

34
Q

Value depends on a group of pixel in the input image

A

Spatial location filtering - convolution

35
Q

Known as edge enhancement

Image in spatial location is converted to be in the spatial frequency

A

Spatial frequency high pass filtering

36
Q

Output image will be blurred

Makes use of a low filter to operate on the input image with the goal

A

Spatial frequency low pass filtering

37
Q

Intended to reduce noise and displayed brightness levels of pixel

A

Smoothing

38
Q

Makes use of a blurred image produces from the low pass filtering process and subtracts it from the original to produce sharp

A

Spatial frequency processing : unsharp masking

39
Q

Pixels are used to change the value of a pixel in the output image

A

Global processing operation

40
Q

Allows user to change the position of pixel rather than brightness of tge pixels

A

Geometric operation

41
Q

Range of technique that allows the user to change the appearance of a digital image

A

Image post processing

Rad Technique (13 decks)

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