chapter 6 part 1 objectives - kaeli mrozinski

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15 Terms

1
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kVp

Kilovoltage peak, which is the measure of the penetrating power of the x-ray beam.

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mA

Milliamperage, which measures the tube current and controls the quantity of x-rays produced.

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mAs

Milliamperage-seconds, the product of mA and exposure time, used to quantify total exposure.

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Image receptor exposure

The amount of radiation that reaches the image receptor during exposure.

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Exposure indicators

Numerical values displayed on a processed image indicating the level of exposure received.

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The 15% rule

An increase or decrease of 15% in kVp is equivalent to doubling or halving the mAs concerning image receptor exposure.

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Photoelectric absorption

The absorption of x-ray photons by tissue, which is reduced with higher kVp settings.

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Subject contrast

Differences in attenuation of x-rays by various tissues, influenced by body habitus and kVp.

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Quantum noise

Image noise resulting from insufficient mAs, leading to a grainy appearance on radiographs.

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Law of reciprocity

States that varying combinations of mA and time that produce the same mAs will result in equivalent exposure.

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mAs and image brightness

The level of mAs does not affect image brightness when using a digital image receptor.

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Digital imaging contrast control

In digital imaging, contrast can be adjusted in post-processing, and kVp impacts but does not solely control it.

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Choosing correct mAs

The selection of appropriate mAs is based on the body habitus of the patient and the area being x-rayed.

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Radiation exposure management

Using higher kVp and lower mAs in digital imaging to reduce patient exposure while maintaining desired IR exposure.

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Overexposure while obtaining good image

It is possible to obtain a good image while overexposing the patient if the mAs is slightly higher than needed.