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“acceptance of a range of exposure factors to produce an acceptable image
- Anatomic thickness
- Body composition
- Optical density (OD)
- Kilovolt peak (kVp)
- Exposure time
- Focal-spot size
Harder to penetrate then normal
Easier to penetrate then normal
low density =________ Brightness
High density =________ Brightness
Mass density of body part or atomic number
MAs is the controlling factor for_____
Change from 200 mA to 300 mA =______% increace
MAs/Quantity of exposure is directly proportional to ________
Tissue density Increased tissue density—as in bone, for example—causes a lighter area on the radiograph because it absorbs more of the primary radiation, leaving less exposure on the IR.
Radiographic density Increased radiographic density means that the image is darker … In other words, radiographic density and tissue density are inversely related to each other.
Image with excessive brightness
or insufficient density
Image with insufficient brightness
or excessive density
When film images (made with manual technique settings) are underexposed or overexposed, a general rule states that a minimum change in mAs of 25% to 30% is required to make a visible difference in radiographic density on the repeat radiograph.”