Two x-ray images of the hand are shown. One corresponds to an x-ray beam with an effective energy of a) 140 keV and the other to an effective energy of b) 50 keV. Identify which is which, and the reasons for the differences in the image contrast and signal intensity. a.None of the above. b.The attenuation coefficient does not gives rise to contrast in x-ray imaging and is not energy dependent. At 50 keV the attenuation coefficient is about the same between tissues and bone showing no contrast, whereas at 140 keV there is a greater difference between tissues showing greater contrast. c.The attenuation coefficient gives rise to contrast in x-ray imaging and is energy dependent. At 140 keV the attenuation coefficient is about the same between tissues and bone showing no contrast, whereas at 50 keV there is a greater difference between tissues showing greater contrast. d. The attenuation coefficient gives rise to contrast in x-ray imaging and is energy dependent. At 50 keV the attenuation coefficient is about the same between tissues and bone showing no contrast, whereas at 140 keV there is a greater difference between tissues showing greater contrast

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Two x-ray images of the hand are shown. One corresponds to an x-ray beam with an effective energy of a) 140 keV and the other to an effective energy of b) 50 keV. Identify which is which, and the reasons for the differences in the image contrast and signal intensity.

a.None of the above.

b.The attenuation coefficient does not gives rise to contrast in x-ray imaging and is not energy dependent. At 50 keV the attenuation coefficient is about the same between tissues and bone showing no contrast, whereas at 140 keV there is a greater difference between tissues showing greater contrast.

c.The attenuation coefficient gives rise to contrast in x-ray imaging and is energy dependent. At 140 keV the attenuation coefficient is about the same between tissues and bone showing no contrast, whereas at 50 keV there is a greater difference between tissues showing greater contrast.

d. The attenuation coefficient gives rise to contrast in x-ray imaging and is energy dependent. At 50 keV the attenuation coefficient is about the same between tissues and bone showing no contrast, whereas at 140 keV there is a greater difference between tissues showing greater contrast

Mass attenuation coefficient
(cm'g)
Mass attenuation coefficient
(em'g")
104
(a)
(b)
10
total
0.1
Compton
100
bone
0.01
10
muscle
fat
0.001
photoelectric
0.1
10 30 50 70 90 110 130 150
10
100
1000
Х-гау energy (keV)
Х-аy energy (keV)
Transcribed Image Text:Mass attenuation coefficient (cm'g) Mass attenuation coefficient (em'g") 104 (a) (b) 10 total 0.1 Compton 100 bone 0.01 10 muscle fat 0.001 photoelectric 0.1 10 30 50 70 90 110 130 150 10 100 1000 Х-гау energy (keV) Х-аy energy (keV)
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