Bone Densitometry

Bone Age Radiology
20 40 60 80 100 Age (years)

c L2-4 comparison to reference values 1.44 -i--------

20 40 60 80 100 Age (years)

Fig. 8.26a This young lady was referred by a colleague from endocrinology. Bone densitometry was performed with dual-energy x-ray-absorptiometry (DXA) equipment. With this modality the lumbar spine is scanned with a narrow x-ray beam twice, first with a higher and subsequently with a lower energy spectrum. The difference after subtraction of the collected attenuation values correlates with the absorption of the osseous substance. b The blue band running from left to right documents the variance and the change over time of the normal bone density in the different sex-matched age groups. The asterisk indicates the age and the bone density of this patient. The density in this case is clearly below normal. c After one year of therapy, the bone density has reached normal levels.

20 40 60 80 100 Age (years)

Fig. 8.26a This young lady was referred by a colleague from endocrinology. Bone densitometry was performed with dual-energy x-ray-absorptiometry (DXA) equipment. With this modality the lumbar spine is scanned with a narrow x-ray beam twice, first with a higher and subsequently with a lower energy spectrum. The difference after subtraction of the collected attenuation values correlates with the absorption of the osseous substance. b The blue band running from left to right documents the variance and the change over time of the normal bone density in the different sex-matched age groups. The asterisk indicates the age and the bone density of this patient. The density in this case is clearly below normal. c After one year of therapy, the bone density has reached normal levels.

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