M3 -Overview on Radiographic Contrast and Density

Densitometer

______ is the device used to measure density.

Differential Absorption

_________ is the difference between those x-rays absorbed and those transmitted to the image receptor.

Radiographic Contrast

_________ is the degree of density difference between two areas on a radiograph.

• Optical

• Photographic

• Film Density

Radiographic Density is also called as (3):

Radiographic Density

_________, also known as Optical, Photographic, or Film Density is a measure of the degree of film darkening.

balance

In radiographic sense, _______ is the relationship between contrast, density, and sharpness.

balanced radiograph

A _________ can be a short or long scale of contrast and can be light or dark.

radiographic contrast

The amount of effort it takes to produce a radiographic image is of no importance if suitable _________ cannot be achieved.

Subject Contrast and Film Contrast

There are 2 major elements that make up radiographic contrast: _______ and _________

Subject Contrast

Is the amount of differential absorption that has taken place among the various body structures lying in the path of the x-ray beam.

radiographic contrast

Other things remaining constant, the degree of differential absorption (subject contrast) will determine _______.

Film Contrast

Denotes the inherent sensitivity a given emulsion has to variations in the intensity of remnant photons striking its surface.

Film Contrast

This sensitivity is manufactured into the film and can be increased and decreased by the manufacturer according to the requirements of the radiologist.

film contrast

There is indeed an optimum radiographic contrast for different body parts which will best demonstrate that particular area, and it is the responsibility of _______ to help produce this optimum condition for the viewer.

Radiographic Density

It is obtained when a sufficient accumulation of black metallic silver crystals is present in the film.

Radiographic Density

This accumulation of silver is directly related to the number of remnant photons that struct the film during an exposure.

radiographic contrast

The film’s inherent ability to emphasize intensities of the remnant beam will determine ________.

Definition

Sharpness or ______ is the third major characteristic.

1. Visibility of Detail

2. Sharpness of Detail

The radiographic image has 2 types of detail:

Visibility of detail

_________ is how well we can see the structures that have been transferred to the film’s emulsion by the quantity and variation of remnant photons.