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CHAPTER 7-CAllegood
SWGTC EXPOSURE CH 7 Wallace-RADIOGRAPHIC CONTRAST
| Question | Answer |
|---|---|
| The amount of radiographic contrast is judged by the number of _________ present on the radiograph? | grey tones |
| There can be too little contrast when the radiograph appears? | very gray |
| There can be too much contrast when the radiograph appears? | mostly black and white |
| The radiographic contrast caused by the differences in the composition of the patient's body tissues? | subject contrast |
| The degree of difference between adjacent densities on a radiograph? | radiographic contrast |
| If the colors of black and white are adjacent to each other, they display a _____amount of contrast? | high |
| If two similar shades of gray are next to each other they display a _____ amount of contrast? | low |
| The image on a radiograph containing the various shades of gray is ? | gray scale image |
| Short scale contrast = | high contrast |
| long scale contrast= | low contrast |
| Subject contrast is caused by? | the tissue density differences, atomic number differences, and thickness differences of the patient's body parts |
| The atoms in ____ are very compact. | bone |
| In a stable atom the number of electrons equals the number of ________? | protons |
| List the body parts in order from less absorbing power to more absorbing power. | Air, Fat, Water, Muscle, and Bone |
| List the body parts from more radiographic density to less radiographic density. | Air, Fat, Water, Muscle, and Bone |
| Patients who are in good physical shape usually display the _______ subject contrast. | highest |
| Bones that have lost minerals because of disease become ____ dense and x-ray photons pass through them more ______. | less; easily |
| Patients who have retained water in their bodies will display a _____ is subject contrast. | decrease |
| Water causes an _______ in the amount of scattered radiation produced in the patient's body. | increase |
| Adding ____ _____ to a body part changes its tissue density. | contrast media |
| The most common type of contrast media are? | air, iodine, and barium |
| Adding air to a body part ______ its tissue density compared to the structures around it. | decreases |
| Adding iodine or barium to a body part ______ its tissue density compared to the structures around it. | increases |
| ________ and _____ are used in the gastrointestinal tract. | Barium and air |
| Used in the kidneys and gall bladder | Iodine |
| What is the main controlling factor for radiographic contrast? | KVP |
| High KVP= | high photon energy |
| Low KVP= | low photon energy |
| Hgih KVP= high photon energy= | low contrast=long scale |
| Low KVP= low photon energy= | high contrast=short scale |
| The major KVP control changes the KVP by a unit of ? | 10 |
| The minor KVP control changes the KVP by a unit of? | 1 or 2 |
| KVP settings usually range from ______ to _____. | 40; 120 |
| The radiation that gets through the patient's body is called? | exit radiation or remnant radiation |
| Scattered radiation ________ radiographic contrast. | lowers |
| High kvp= more scattered radiation= | low contrast image |
| Low kvp= less scattered radiation= | high contrast image |
| Three things that can happen to the primary x-ray photon as they enter the patient's body are? | They can be absorbed, they can be scattered, and they can pass through and hit the film. |
| As the x-ray photons are absorbed or scattered, the radiation intensity of the original beam is ________. | reduced |
| The reduction of radiation intensity by absorption or scattering as the beam passes through matter is called? | attenuation |
Created by:
radtech
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