Chapter Review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Determining the scale of contrast is one role of kVp. T or F | True
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| Subject contrast will vary with physical condition. T or F | True
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| Film/screen combination has no effect on contrast. Tor F | False
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| All other factors remaining constant, an increase in kVp will have what effect on density? | increase
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| The longer the OID, the _______ the loss of sharpness | greater
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| The ________ the screen, the greater the sharpness. | slower
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| What 3 things can be used to minimize size distortion | very small focal spot, increase SID, decrease OID
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| What does filtration absorb | low energy photons
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| What term defines the "range of acceptable SID's that can be used with a focus grid"? | grid focal range
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| What effect does increasing filtration have on radiographic contrast | decreases contrast
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| In what year were x-rays discovered? |
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| In what year were some of the biologically damaging effects of x-rays discovered? |
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| X-rays were discovered in experiments dealing with electricity and ___________. |
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| X-rays were discovered when they caused a barium platinocyanide–coated plate to _________. |
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| X-radiation is part of which spectrum? |
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| X-rays have a dual nature, which means that they behave like both ________________. |
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| The wavelength and frequency of x-rays are __________________ related. |
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| X-rays have __________________ electrical charge. |
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| X-rays have ____________. |
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| The x-ray beam used in diagnostic radiography can be described as being ___________. |
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| Which x-ray tube component serves as a source of electrons for x-ray production? |
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| Electrons interact with the ______ to produce x-rays and heat. |
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| The cloud of electrons that forms before x-ray production is referred to as ______. |
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| The burning or boiling off of electrons at the cathode is referred to as ______. |
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| Which primary exposure factor influences both the quantity and the quality of x-ray photons? |
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| The unit used to express tube current is ______. |
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| What percentage of the kinetic energy is converted to heat when moving electrons strike the anode target? |
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| The intensity of the x-ray beam is greater on the ______. |
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| According to the line focus principle, as the target angle decreases, the ________. |
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| ___________ extends x-ray tube life. |
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| Which type of target interaction is responsible for most of the x-rays in the diagnostic beam? |
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| Increasing the kVp results in ______. |
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| Total filtration in the x-ray beam includes ______. |
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| The process whereby a radiographic image is created by variations in absorption and transmission of the exiting x-ray beam is known as ______. |
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| Which processes occur during the x-ray beam interaction with tissue? |
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| The ability of an x-ray photon to remove an atom's electron is a characteristic known as ______. |
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| The x-ray interaction responsible for absorption is ______. |
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| The x-ray interaction responsible for scattering is ______. |
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| Remnant radiation is composed of what 2 things? |
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| What interaction creates unwanted exposure to the image, known as fog? |
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| What 2 factors would affect beam attenuation? |
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| The low-density or high brightness areas on a radiographic image are created by ________. |
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| An anatomic part that transmits the incoming x-ray photon would create an area of ______________ on the radiographic image. |
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| The process of creating a radiographic image by differential absorption varies for film-screen and digital imaging. |
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| An attribute (or attributes) of a radiographic image that affects the visibility of sharpness is _________. |
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| A radiographic film image with many densities but little differences among them is said to have ________. |
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| What is defined as the range of exposure intensities an image receptor can accurately detect? |
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| What 2 factors would improve digital image quality? |
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| Which of the following is accurate regarding the relationship between milliamperage (mA) and exposure time to maintain the exposure to the image receptor? |
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| A radiographic film image has excessive density. What is best to do in order to correct the exposure error? |
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| What exposure factor affects both the quality and the quantity of the x-ray beam? |
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| What is not affected by kilovoltage? |
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| How is the quality of the image affected when more than needed radiation exposure reaches the digital image receptor? |
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| What would maintain radiation exposure to the image receptor when the kilovoltage is decreased by 15%? |
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| Without exposure technique compensation, increasing the OID by 4 inches for a knee film image would: |
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| Which factor does not affect the radiation exposure to the image receptor? |
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| What exposure factor change is recommended to maintain radiation exposure to the image receptor when increasing patient thickness by 5 cm? |
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| Instilling a negative contrast agent in the gastrointestinal tract has what effect in the area of interest on the digital image? |
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| The projected shape of the unrestricted primary beam is _______________. |
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| A purpose of beam-restricting devices is to _______________ by changing the size and shape of the primary beam. |
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| The most effective type of beam-restricting device is the _______________. |
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| Of the beam-restricting devices (cone, aperture diaphragm, collimator, cylinder), which two are most similar to one another? |
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| The purpose of automatic collimation is to ensure that _______________. |
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| When making a significant increase in collimation, _______________. |
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| What increases as collimation increases? |
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| What is true of positive beam-limiting devices? |
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| The purpose of a grid in radiography is to _______________. |
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| Grid ratio is defined as the ratio of the _______________. |
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| Compared with parallel grids, focused grids _______________. |
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| Which grid would a convergent line be formed if imaginary lines from its grid lines were drawn in space above it? |
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| Grid cutoff, regardless of the cause, is most recognizable on a film radiograph as reduced ______. |
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| Off-focus grid cutoff occurs by using an SID that is not ___________. |
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| The type of motion most used for moving grids today is ________. |
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| A grid should be used whenever the anatomic part size exceeds _____. |
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| The air gap technique uses an increased ________ instead of a grid. |
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