Displays And Image Storage

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

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

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?

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

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

Smallest part of a digitized image.

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

It displays up to 3 gray shades simultaneously.

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

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.

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.

4. Which electronic component is required for grayscale imaging?

VCR

Non-interlaced display

Computer memory

Scan converter

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.

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.

5. All of the following are Advantages of PACS systems EXCEPT:

Data will not deteriorate over time

Images can be delivered to distant locations on the imaging network

Older, achieved studies and reports can be reviewed easily

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

Image resolution is not improved simply with the use of a PACS system.

Explanation

Image resolution is not improved simply with the use of a PACS system.

6. All of the following are disadvantage of analog scan converters EXCEPT:

Image fade

Low-resolution image

Image flicker

Deterioration

Analog scan converters produced High-Resolution images. The other 3 choices are shortcomings of analog converters.

Explanation

Analog scan converters produced High-Resolution images. The other 3 choices are shortcomings of analog converters.

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

These methods are very costly

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

Only low resolution images are stored

Only black & white images are stored

data stored on videotape and computer discs can be erased by strong magnetic fields

Explanation

data stored on videotape and computer discs can be erased by strong magnetic fields

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9. All of the following are characteristics of write magnification EXCEPT:

Preprocessing function

More pixels in the region of interest

Identical regions stored in the scan converter before and after zooming

It is the preferred method of image magnification

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.

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.

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

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

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

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

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

A normal CRT creates images by using 525 horizontal scan lines that appear on the screen in an interlaced format.

Explanation

A normal CRT creates images by using 525 horizontal scan lines that appear on the screen in an interlaced format.

11. Which of the following correctly describes a typical television display?

Interlaced

Progressive Scan

Bistable

Non-Interlaced

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.

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.

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

Digital with 256 x 256 pixels

Digital with 512 x 512 pixels

Digital with 128 x 128 pixels

Analog wiht 1000 x 1000 array

1 miillion picture elements (1,000 x 1,000), has the highest image detail

Explanation

1 miillion picture elements (1,000 x 1,000), has the highest image detail

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

It is the smallest element of an image.

It is bistable.

Eight bits combine to make a byte

It is a component of a digital scan converter.

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

Explanation

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

14. Which of the following procedures is postprocessing?

Modifying a frozen image

Read zoom

Write zoom

Adjusting the brightness of the CRT

Increasing the receiver gain

Write zoom & increasing the receiver gain is preprocessing

Explanation

Write zoom & increasing the receiver gain is preprocessing

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15. Which of the following forms of information are Analog?

The signal from the transducer to the receiver

The input signal to the digital-to-analog converter

The output signal from the analog-to-digital converter

The input signal to the analog-to-digital converter

The output signal from the digital-to-analog converter

A typical video signal

The Input signal to the Digital-to-Analog converter & the Output signal from the Analog-to-Digital converter are Digital forms.

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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