Density on the Conventional Radiograph

Overall amount of blackening on the radiographic image (X-ray film) is known as ____________

• density

• contrast

• resolution

Optimum density value is ___________

• < 0.25 OD

• 0.25 - 2.5 OD

• > 2.5 OD

A tool used to measure density on an x-ray film is called _____________

• sensitometer

• film processor

• densitometer

The most important factor that influence the density of an x-ray film is ___________

• kV

• mAs

• SID

If you increase the mAs, the density will ________ (proportionally)

• increase

• decrease

• static (no changes)

Any combination of milliampere (mA) and time (s) that will produce a given mAs will produce identical density on the X-ray film. This is ____________

• reciprocity law

• 15% rule

• inverse square law

Human eyes can detect at least _____ % change of density on the x-ray film.

• 10

• 20

• 30

A radiographer set 15 mAs on a control panel to produce abdomen x-ray film. However, the x-ray film produce is insufficient and low density. If the radiographer want to re-do the abdomen x-ray with double the density from previous film, suggest the new mAs?

• 7.5 mAs

• 20 mAs

• 30 mAs

Kilovoltage (kV) also effect the density of x-ray film. If you increase the the kV, the density will ___________ (but not proportional).

• increase

• decrease

• static (no changes)

if kV increase by 15%, the density will double & if the kV reduce by 15%, the density will reduce to half. This explain the ___________

• reciprocity law

• 15% rule

• inverse square law