Digital 9-12

An electronic version of the radiologist’s reading room and the file room:

Electrical signals from CR and DR are:

Preprocessing takes place in the:

Postprocessing is done by:

A graphical representation of exposure values collected form the imaging plate:

Exposure data recognition processes only the:

The data recognition program searches for anatomy recorded on the imaging plate by finding the ____ and then elimitating the ____.

Low kVp gives a ____ histogram while high kVp gives a ____ histogram.

On the histogram graph, the y-axis is the ____ and the x-axis is the ____.

The shape of a histogram is _____ specific.

Aliasing results in:

When exposure is greater or less than what is needed to produce an image, ____ occurs.

A table of the luminance values derived during image acquisition:

LUT is used to:

LUT can be graphed by placing the original values on the __axis and the new values on the ___ axis.

With a LUT, the brightness can be increased or decreased by:

Latitude is also called:

Latitude refers to the ____ that can be used and stillr esult in a diagnostic quality image.

The exposure latitude for digital imaging receptors is ___ than thatof screen/film exposures due to ____.

Histograms show a wide range of exposure because of:

More than 50% below ideal exposure results in:

More than 200% above ideal exposure results in:

What feature increases latitude while preserving contrast and vitually eliminates detail loss in dense tissues?

What is MTF?

The ability of a system to record available spatial frequencies is known as:

The sum of the components in a recording system cannot be:

What quantifies the contribution of each system component to the overall efficiency of the entire system?

A perfect system would have an MTF of:

Phosphor light spreads which reduces system ____. The more light spread, the lower the ____.

The initial digital image appears linear when graphed because:

Image contrast is controlled by using a parameter that changes the _____ of the _____.

Detail or sharpness is referred to as:

Sharpness control is referred to as:

Two major types of spatial frequency filtering:

____ occurs when fewer pixels in the neighborhood are included in the signal average.

After the signal is obtained for each pixel, the signals are ____ to shorten processing time and storage.

The more pixels involved in the averaging, the ____ the image appears.

The signal strength of one pixel is averaged witht he strength of ____.

High pass filtering is accomplished by:

High pass filtering increases ____ and ____ and is useful for enhancing ___ structures, but can be noisy.

Smoothing, also known as ____, occurs by averaging each pixels frequency with surrounding pixel values to remove ____.

Low-pass filtering is useful for viewing small structures such as:

The most common image processing parameters are those for:

____ controls how light or dark and image is and ____ controls the contrast.

Unexposed borders around the collimation edges results in:

Removing the white unexposed borders results in an oerall smaller number of ____ and reduces the amount of ____.

Two basic types of magnification techniques in digital systems:

The first PACS were used int he early ____ and generally served ____.

PACS can be broekn into 3 parts:

First modality of PACS:

An archive server is the ____ for PACS.

The central part of the PACS; houses all of the historic data along with the current data being generated:

The hardware and softwear infrastructure of a computer system is the :

In a PACS. the system architecture normally consists of:

Three common PACS architectures:

In a client/server based system, images are sent directly to the ____ after acquisition and are centrally located.

In this system, acquisition modalities send the images to a designated reading station and possibly to review stations, then sent to the archive server once the images have been read:

Most interactive part of the PACS:

The brain of the archive system; contains the master database, controls movement of images and interfaces withthe RIS and HIS:

Two major types of film digitizers:

Common uses for film digitizers:

Two major types of imagers (printers):

A plan for the systemic obsservation and assessment of the different aspects of a project service or facility to make certain that standards of quality are being met:

A comprehensive set of activities designed to monitor and maintain systems that produce a procuct:

Three major categories of Quality Control:

PACS QC activities:

Who requires compliance with standards of practice to ensure quality in any imaging system?