# Displays And Image Storage

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Kfdm26
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Quizzes Created: 15 | Total Attempts: 53,577
Questions: 15 | Attempts: 98

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Analog, Digital, Scan Converters, Image Processing, Spatial Resolution, Storage Media

• 1.

### What is the number of shades that can be respresented by 3 bits?

Explanation
We have 3 bits, so take the number 2 and multiple it by itself 3 times.
Eight different gray shades are stored with 3 bits

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• 2.

### What is the number of shades that can be respresented by 8?

Explanation
With 8 bits, the number 2 is multiplied by itself 8 times. 256 different gray shades can be stored with 8 bits

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• 3.

### All of the following are ture of ordinary cathode ray tubes EXCEPT:

• A.

It contains large vacuum tubes with a phosphor-coated screen.

• B.

Electrons are emitted by a gun and swept across the screen by varying magnetic fields.

• C.

There are 600 horizontal scan lines from top to bottom, painted in order from 1 to 600.

• D.

There are 60 fields generated each second that combine into 30 frames per second

C. There are 600 horizontal scan lines from top to bottom, painted in order from 1 to 600.
Explanation
A normal CRT creates images by using 525 horizontal scan lines that appear on the screen in an interlaced format.

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• 4.

### Which of the following correctly describes a typical television display?

• A.

Interlaced

• B.

Progressive Scan

• C.

Bistable

• D.

Non-Interlaced

A. Interlaced
Explanation
A typical television display uses interlaced scanning, where the screen is divided into two fields, with odd-numbered lines displayed in one field and even-numbered lines displayed in the other field. This method allows for a smoother and more fluid motion on the screen.

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• 5.

### Which electronic component is required for grayscale imaging?

• A.

VCR

• B.

Non-interlaced display

• C.

Computer memory

• D.

Scan converter

D. Scan converter
Explanation
A scan converter is required for grayscale imaging because it is able to convert the input video signal into a format that can be displayed on a grayscale monitor. It takes the analog video signal and converts it into a digital format, allowing for precise control of the grayscale levels. This component is essential in medical imaging, where grayscale is commonly used to visualize different tissue densities.

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• 6.

### All of the following are disadvantage of analog scan converters EXCEPT:

• A.

• B.

Low-resolution image

• C.

Image flicker

• D.

Deterioration

B. Low-resolution image
Explanation
Analog scan converters produced High-Resolution images. The other 3 choices are shortcomings of analog converters.

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• 7.

### Which of the following scan converters will provide the best Spatial Resolution?

• A.

Digital with 256 x 256 pixels

• B.

Digital with 512 x 512 pixels

• C.

Digital with 128 x 128 pixels

• D.

Analog wiht 1000 x 1000 array

D. Analog wiht 1000 x 1000 array
Explanation
1 miillion picture elements (1,000 x 1,000), has the highest image detail

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• 8.

### Which of these statements, regarding a bit of computer memory is FALSE?

• A.

It is the smallest element of an image.

• B.

It is bistable.

• C.

Eight bits combine to make a byte

• D.

It is a component of a digital scan converter.

A. It is the smallest element of an image.
Explanation
A bit is the smallest element of computer memory. A bit is not a part of an image.

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• 9.

### How many gray shades can be represented by a group of: a. 4 Bits b. 2 Bits

Explanation

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• 10.

### Which of the following statements regarding a pixel is FALSE?

• A.

Smallest part of a digitized image.

• B.

A collection of bits, assigned to each pixel, stores the shade of gray.

• C.

It displays up to 3 gray shades simultaneously.

• D.

Image quality is improved when the number of pixels is high.

C. It displays up to 3 gray shades simultaneously.
Explanation
A pixel is the smallest part of a digitized image and is represented by a collection of bits that store the shade of gray. However, a pixel can display more than just 3 gray shades simultaneously. The number of gray shades a pixel can display depends on the bit depth or color depth of the image. A higher bit depth allows for a larger number of gray shades, resulting in better image quality.

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• 11.

### Which of the following procedures is postprocessing?

• A.

Modifying a frozen image

• B.

• C.

Write zoom

• D.

Adjusting the brightness of the CRT

• E.

A. Modifying a frozen image
D. Adjusting the brightness of the CRT
Explanation
Write zoom & increasing the receiver gain is preprocessing

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• 12.

### Which of the following forms of information are Analog?

• A.

The signal from the transducer to the receiver

• B.

The input signal to the digital-to-analog converter

• C.

The output signal from the analog-to-digital converter

• D.

The input signal to the analog-to-digital converter

• E.

The output signal from the digital-to-analog converter

• F.

A typical video signal

A. The signal from the transducer to the receiver
D. The input signal to the analog-to-digital converter
E. The output signal from the digital-to-analog converter
F. A typical video signal
Explanation
The Input signal to the Digital-to-Analog converter & the Output signal from the Analog-to-Digital converter are Digital forms.

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• 13.

### All of the following are characteristics of write magnification EXCEPT:

• A.

Preprocessing function

• B.

More pixels in the region of interest

• C.

Identical regions stored in the scan converter before and after zooming

• D.

It is the preferred method of image magnification

C. Identical regions stored in the scan converter before and after zooming
Explanation
With write magnification, the system concentrates all of the image scan lines into the region of interest (ROI). The anatomy on either side of the ROI is no longer scanned.

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• 14.

### What is the primary Disadvantage of video tape and computer disc methods of image archiving?

• A.

These methods are very costly

• B.

The information is vulnerable to erasure when exposed to strong magnetic fields

• C.

Only low resolution images are stored

• D.

Only black & white images are stored

B. The information is vulnerable to erasure when exposed to strong magnetic fields
Explanation
data stored on videotape and computer discs can be erased by strong magnetic fields

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• 15.

### All of the following are Advantages of PACS systems EXCEPT:

• A.

Data will not deteriorate over time

• B.

Images can be delivered to distant locations on the imaging network

• C.

Older, achieved studies and reports can be reviewed easily

• D.

Images have higher resolution than that appears on the system's display.

D. Images have higher resolution than that appears on the system's display.
Explanation
Image resolution is not improved simply with the use of a PACS system.

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• Current Version
• Mar 14, 2023
Quiz Edited by
ProProfs Editorial Team
• Nov 26, 2011
Quiz Created by
Kfdm26

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