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In mammography: a. A low tube potential is needed because of the small irradiated tissue b. The film has a smaller latitude compared with general radiography c. The screen is made of caesium iodide d. Single-sided emulsion is used on the inner side of the film e. The principal interaction is the photoelectric effect with L-shell electrons |
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Answer» a. False. A low tube potential is needed to maximize the low-contrast subject. b. True. In mammography, there is not much difference between the different tissues imaged. Therefore, mammography film has a small latitude, i.e. the range of exposure needed to cover the grey scale is reduced, so that a small change in exposure gives an enhanced change in blackening of the film. This means that mammography film has a very steep linear part of the sensitometric curve. c. False. It is made of rare earth materials. d. False. Single-sided emulsion is used on the distal side of the film. e. True. |
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