Radiography: Technique, Contrast, and Distance Formulas

Vocabulary flashcards covering distance formulas, image formation, contrast resolution, and exposure factors from the lecture.

Direct square law

The formula used to determine a new mass when radiographic distance is changed.

Latent image

The unviewed image in histogram form on an exposed plate or cassette before it appears on the display.

Contrast resolution

The ability to distinguish two objects of similar densities.

Grids

Radiographic devices used to reduce scatter radiation with the intent of increasing image contrast.

Ionization chamber

A sensor block used in exposure detection.

KVP

A technical factor that produces more scatter and more grays when increased, leading to decreased contrast in the image.

Indirect square law

The formula used when distance changes and radiation dose units such as milligray or Sieverts are evaluated rather than mass.