Ch 28
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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| _______ is the degree of overall blackening of the film. (photographic property that comprise visibility of detail) | show 🗑
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| ______ is the concept of density as it is displayed on a soft-copy monitor for digital images. | show 🗑
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| ________ describes the digital processing that produces changes in density/brightness. | show 🗑
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| What range of OD is visible to the human eye? | show 🗑
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| What is the major consideration in assessing density verification? | show 🗑
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| show | overexposed
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| show | window level
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| Whenever a choice must be made between excess and insufficient density, the best decision is always the choice that will produce the ________ image. | show 🗑
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| show | film density
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| _______ is the controlling factor of density. | show 🗑
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| show | kVp
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| show | insufficient/excessive
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| _______is determined by the characteristics of the IR. | show 🗑
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| _______ is the ability of the film to stop light. | show 🗑
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| If a region of a radiograph has an OD of 1.0 only _______ of the incident light is transmitted through the radiograph in that region. | show 🗑
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| The straight line portion of the D lo E curve, film density is _________ to the log relative exposure. | show 🗑
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| Will doubling the exposure result in a doubling the film density? | show 🗑
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| show | window leveling
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| show | mAs
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| show | graphic representations
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| As mAs increases, ________ increases proportionally and ________ also increases. | show 🗑
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| The reciprocity law fails for __________ or _________ exposure times. | show 🗑
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| If the mAs used to create one image is the same as the mAs used to create a second image of the same structure, then both images should have the same __________. | show 🗑
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| The minimum change necessary to cause a visible shift in film density is ______ of mAs or any other influencing factors that would equal this change. | show 🗑
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| _______ is mainly controlled by the radiographer, but can also be preset with a computerized exposure system. | show 🗑
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| show | bright light/scanner
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| show | doubles/halves
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| Kilovoltage has a __________ effect on density. | show 🗑
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| Kilovoltage contols the average ____ of the x-ray photon produced at the anode target. | show 🗑
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| The 15% rule is used as a guide to maintain the same image receptor exposure film density when _______ changes. | show 🗑
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| The 15% rule will always change the ______ of the image. | show 🗑
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| show | 51 kVp
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| show | 25
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| Motion has what impact on density? | show 🗑
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| What is grid ratio? | show 🗑
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| An increase in pt size will ______ density and a decrease in pt size will _____ density. | show 🗑
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| show | increase
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| An increase lead in the grid will ____ density. | show 🗑
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| An increase in screen speed will ____ density.(more efficient) | show 🗑
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| show | an inverse relationship
(inverse square law)
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| show | inverse relationship
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| Increased generator will result in an ______ density. (high field, more efficient) | show 🗑
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| show | density
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| Pulmonary edema would show on a radiograph with ______ density. | show 🗑
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| show | density/contrast
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| As developer solution temperature increases, film density will _______. | show 🗑
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| If a satisfactory exposure is obtained with 20 mAs at 72", what mAs will be required to maintain the same exposure at 40"? | show 🗑
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| If a satisfactory PA chest radiograph is made at 72" with 4 mAs, what mAs, will be required at 56"? | show 🗑
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| show | 51 kVp
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| show | generator efficiency
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| show | cathode/anode
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| show | negatively
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| show | 40 mAs/200mA = .20 sec
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| A radiograph of the forearm is produced using 4 mAs at 55kVp. What kVp would be required to double the exposure? | show 🗑
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| show | mAs2=60
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| show | mAs2=12
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| What is the proper mAs for use with an 80 RS system when technical factors of 55 kVp and 5 mAs produce an acceptable image with a 200 RS system? | show 🗑
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| An increase in patient size will ___________ density. A decrease in patient size will _______ density. | show 🗑
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| show | decrease
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