Image Production-Processing and Display

The ability of a digital system to display details (expressed as the number of line pairs per millimeter) is known as what?

Spatial resolution

Edge enhancement can be applied to a digital image to improve which of the following?

The contrast along the edges of a structure

Which of the following is a step-by-step procedure for solving a problem or accomplishing a task?

Algorithm

Applying too much edge enhancement to a digital image can result in which of the following?

Halo artifact

How many shades of gray can be displayed with a bit depth of 12 bits?

4096

One of the most important aspects of digital imaging is the ability of the computer to mathematically change the image’s brightness and contrast. Which of the following controls image brightness?

Window level

In digital fluoroscopy, what is the function of the automatic gain control (AGC) or automatic brightness control (ABC)?

To maintain constant image brightness regardless of tissue thickness

After the values of interest have been determined from the histogram, which of the following is used to readjust those numbers to produce the proper contrast?

Look-up table

Visually, dynamic range refers to which of the following?

The number of shades of gray than can be represented

Which of the following describes a short scale of contrast?

High contrast

A small area network that is the least expensive, fastest, and typically only shares images and data within a single geographic area is known as a:

LAN

What is the purpose of a film digitizer?

To convert analog film images into digital images

Which of the following controls contrast in a digital system?

Look-up table

Which of the following terms is used to describe long-term storage of digital images and documents?

Archive

Which of the following is not an output device in digital imaging?

X-ray machine

The unit of brightness of a digital radiographic image is known as a:

Candela

As a display monitor increases in size, how will spatial resolution be affected if the matrix size remains the same?

Decrease

A networked group of computers, servers and archives that is used to manage the display and storage of a digital images is know as:

PACS

Which type of digital device has a narrow viewing angle, puts out less heat, and can be used around more ambient light?

AMLCD monitor

When referring to digital imaging, what does the term digital mean?

Using numbers to generate images

The quality of a digital image depends on which of the following?

1. Spatial resolution

2. Brightness

3. Contrast

All 3

A hospital’s plan to periodically backup archived files is known as what?

Disaster recovery plan

Which of the following is NOT an advantage of digital imaging?

Image’s spatial resolution

Which of the following describes low contrast?

Long scale

Noise in low exposure areas and saturation in high exposure areas can result when which one of the following post processing techniques is excessively applied?

Equalization

Spatial resolution in digital imaging is determined by which of the following?

Matrix size and the size of the field of view

Which of the following statements would define spatial resolution in digital imaging?

The measure of the amount of detail in an image

Which of the following is a geometric factor that affects spatial resolution on a digital image?

OID

Which of the following are advantages of digital systems over film-screen systems?

1. Increased dynamic range

2. Higher spatial resolution

3. More contrast resolution

1 and 3 only

Which of the following would NOT produce a digital imaging processing error?

The proper values of interest determined

The three-dimensional volume of tissue that is represented in each pixel is known as what?

Voxel

Image brightness is controlled by which post-processing tool?

Window level

Which of the following statements is false?

If the CR software cannot locate the collimated borders the plate is rejected

Which of the following refers to adding text to a digital image?

Annotate

Smoothing can be applied to a digital image to mask which of the following?

Noise

Which component of a PACS system is responsible for the storage of historic data to be viewed with current imaging studies?

Archive server

Which standard format ensures that all digital images and devices communicate and transfer information to one another?

DICOM

One image per imaging plate is preferred. Which of the following must be done to assure ideal processing of the image?

1. The exposure field is centered to the cassette

2. The anatomical part is centered to the cassette

3. At least three, or ideally four collimated borders can be recognized

All 3

What does the acronym RAID stand for?

Redundant Array of Independent Disks

The term teleradiology refers to:

Electronically transmitting images from one place to another

Which of the following refers to automatic rescaling?

Adjusting the raw data to display the proper brightness