Contrast info, Density info
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| An H & D curve demonstrating a steep curve represents film with ______? | show 🗑
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| How does the use of grids affect the contrast of a radiograph? | show 🗑
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| Subject contrast is caused by? | show 🗑
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| List the body parts in order from less absorbing power to more absorbing power. | show 🗑
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| Adding air to a body part ______ its tissue density compared to the structures around it. | show 🗑
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| show | Increases
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| show | kVP
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| show | Exit radiation or remnant radiation
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| Scattered radiation ________ radiographic contrast. | show 🗑
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| show | Air, Barium and Iodine
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| Adding air <increases/decreases> radiographic density | show 🗑
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| As x-ray photons are absorbed, scattered, or pass through, the intensity of the beam is reduced. this is called _______. | show 🗑
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| ________ refers to the ability of a film to record a wide range of densities. | show 🗑
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| Low energy radiation will result in ______ ____ contrast. | show 🗑
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| show | Produce lower contrast
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| show | kVp
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| How will increasing screen speed affect radiographic quality? | show 🗑
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| Which grid ratio should be used to maintain contrast when using over 100 kvp? | show 🗑
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| The number of density difference in a radiograph refers to what? | show 🗑
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| How does a small increase indeveloper temperature affect radiographic contrast? | show 🗑
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| show | Hyperstenic
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| show | Penetrometer
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| show | Produce higher contrast
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| Contrast can be measured from an H & D curve by finding the slope of the ________ ________. | show 🗑
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| Long wavelength radiation will result in _____ scale contrast. | show 🗑
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| What type of relationship occurs with contrast when mAs increases? | show 🗑
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| show | Inverse relationship
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| show | No change
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| Why is contrast needed in a radiographic image? | show 🗑
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| show | Contrast decreases.
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| As contrast decreases, how is the number of densities in the film affected? | show 🗑
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| show | Motion has no effect on contrast.
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| show | Difference between adjacent densities.
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| A visible change in kVp is not seen until kVp is changed __ to __%, depending on kVP range. | show 🗑
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| show | Film and subject contrast
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| show | The range of densities that the image is capable of recording.
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| show | Range of differences in the intensity of the x-ray beam after it has been attenuated by the subject.
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| show | Decreased contrast
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| Density is one of the two ________ properties comprising visibility of detail. | show 🗑
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| Increments of 0.3 changes in optical density numbers represent a ________ or ________ of opacity. | show 🗑
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| show | Window levelling
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| show | Reciprocity law
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| When kVp ranges 30 - 50, a __ to ___ percent change in kVP can be detected. | show 🗑
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| A __ to ___ percent change in kVp is required in the 50-90 kVp range. | show 🗑
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| A ___ to __ percent change in kVp is required in the 90 - 130 kVp range. | show 🗑
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| show | 60 to 100
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| The image receptor exposure is always greater at the _________ end. | show 🗑
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| show | small angle
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| show | Cathode
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| Radiolucent contrast media (air) will _________ film density. | show 🗑
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| show | Decrease
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| As relative speed increases, the amount of exposure required to maintain the same film density ____________. | show 🗑
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| show | Increase, increase
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| Film density will _____ when developer solution temperatures ________. | show 🗑
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| __________ ____________ controls image contrast. | show 🗑
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| As the slope of the Dlog E curve increases, contrast is _______. | show 🗑
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| Low kVp produces ____ subject contrast because most of the low energy photons are absorbed by thicker parts. | show 🗑
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| With high kVP, subject contrast is _______ because more uniform penetration occurs between thick and thin parts. | show 🗑
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| In a fixed kilovoltage system, the kVp is held _______, while the mAs is ______ to achieve appropriate image receptor exposure. | show 🗑
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| show | Decrease
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| _______________ kVp is the maximum kVp level that will produce images with appropriate contrast, consist within acceptance limits. | show 🗑
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| The objective of optimal kVp is to determine the ____kVp and _____ contrast that is within acceptance limits. | show 🗑
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| show | Variable kilovoltage
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