Analyzing the Latent Radiographic Image

Flashcards for Radiographic Image Analysis

__ is the term for overall detail in a radiographic image.

The overall ability of an imaging system to bring out the maximum number of details or the most visible information.

The __ is the term given to the unprocessed image in digital radiography.

The unprocessed image that includes all the electronic information that has been captured but has not been processed to form a fully visible image.

__ has a direct effect on the exposure level of the latent image.

mAs affects it in direct proportion and is the prime controlling factor for exposure.

__ affects the exposure level of the latent image exponentially.

Affects exposure exponentially (increase kVp = increase exposure).

Decreasing __ will result in decreased exposure.

Decrease field size/increase collimation = decrease exposure.

Increased __ will result in increased exposure.

Increased scatter = increased exposure.

__ affects exposure by the inverse square law.

increased SID = decreased exposure.

__ controls sufficient penetration, which is critical for subject contrast.

kilovoltage-peak (kVp)

Increased __ will decreases subject contrast.

Increased field size = decreased subject contrast.

Increased __ will result in decreased subject contrast.

Increased scatter = decreased subject contrast.

The use of a __ will result in increased subject contrast.

Use of a grid and increased grid ratio = increased subject contrast.

__ round off the corners of the resulting exposure trace of the lead foil strips in the line-pair template

The effects of absorption penumbra round off the corners of the resulting exposure trace of the lead foil strips in the line-pair template

When is plotted against of the lines of a line-pair test template, we obtain a graph

When MTF (contrast resolution) is plotted against spatial frequency (sharpness) of the lines of a line-pair test template, we obtain a graph

Digital systems can only image objects larger than a __.

Digital systems can only image objects larger than a single pixel.

__ is caused by the decrease in projected thickness of an object towards its edges.

Absorption penumbra is caused by the decrease in projected thickness of an object towards its edges.

__ = absorption penumbra + geometric penumbra

total penumbra = absorption penumbra + geometric penumbra

__ is measured by the spatial frequency, or the number of details (lines) that can be fit into a given amount of space

Spatial resolution (sharpness) is measured by the spatial frequency, or the number of details (lines) that can be fit into a given amount of space

__ is measured by the modulation transfer function (MTF)

Contrast resolution is measured by the modulation transfer function (MTF)