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Regarding dual-energy subtraction: a. A high kV image displays a high contrast between bone and soft tissues b. At low kV, the image contrast is influenced by tissue density rather than atomic number c. Subtraction of the low kV from the high kV image improves the soft tissue contrast d. Subtraction of the high kV from the low kV image displays bony details e. This technique involves taking three images: mask, low kV and high kV in rapid succession |
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Answer» a. False. A low kV image displays a high contrast between bone and soft tissues. b. False. At high kV, the contrast of bone is significantly reduced, and image contrast is influenced by tissue density rather than atomic number. c. True. d. True. e. False. No mask image is needed. |
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