Automatic region of interest determination in dual photon absorptiometry of the lumbar spine

1991 ◽  
Vol 10 (2) ◽  
pp. 200-206 ◽  
Author(s):  
L.F. Verheij ◽  
J.A.K. Blokland ◽  
A.M. Vossepoel ◽  
R. Valkema ◽  
J.A.J. Camps ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Region Of Interest ◽  
Dual Photon Absorptiometry ◽  
Photon Absorptiometry

Measurement of lumbar spine bone mineral: a comparison of dual photon absorptiometry and computed tomography

1985 ◽  
Vol 58 (691) ◽  
pp. 621-624 ◽  
Author(s):  
P. N. Sambrook ◽  
C. Bartlett ◽  
R. Evans ◽  
R. Hesp ◽  
D. Katz ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Lumbar Spine ◽  
Bone Mineral ◽  
Dual Photon Absorptiometry ◽  
Photon Absorptiometry

Comparison of Dual-Energy X-Ray Absorptiometry and Dual Photon Absorptiometry for Bone Mineral Measurements of the Lumbar Spine

1988 ◽  
Vol 63 (11) ◽  
pp. 1075-1084 ◽  
Author(s):  
HEINZ W. WAHNER ◽  
WILLIAM L. DUNN ◽  
MANUEL L. BROWN ◽  
RICHARD L. MORIN ◽  
B. LAWRENCE RIGGS
Keyword(s):  
Lumbar Spine ◽  
Bone Mineral ◽  
Dual Energy ◽  
Dual Photon Absorptiometry ◽  
Photon Absorptiometry ◽  
X Ray ◽  
Bone Mineral Measurements

Vertebral Bone Mineral Measurement Using Dual Photon Absorptiometry and Computed Tomography

1988 ◽  
Vol 29 (1) ◽  
pp. 89-94 ◽  
Author(s):  
S. Eriksson ◽  
B. Isberg ◽  
U. Lindgren
Keyword(s):  
Computed Tomography ◽  
Lumbar Spine ◽  
Bone Mineral ◽  
Vertebral Body ◽  
Dual Energy ◽  
Dual Photon Absorptiometry ◽  
Mineral Density ◽  
Photon Absorptiometry ◽  
The Mean ◽  
Posterior Elements

The lumbar spine of 14 cadavers was studied both by 153Gd dual photon absorptiometry (DPA) and quantitative computed tomography (QCT) at 96 and 125 kVp. The intact spine and the individual vertebrae were analyzed. After these measurements the ash content of the vertebral body, the posterior elements, and the transverse processes was determined. The fat content of the vertebral body as well as its volume was also measured. With DPA, the bone mineral content (BMC) determined in situ as well as on excised spine specimens correlated highly with the amount of total vertebral ash (r>0.92, SEE<3.2 g). The bone mineral density (BMD, area density) of 3 lumbar vertebrae correlated accurately with the mean ash density of the vertebral body (r>0.81, SEE<0.015 g/cm3). The so-called corpus density and central density determinations were less accurate. No difference in accuracy was found between measurements when using 3 mm and 4.5 mm step intervals. Variations in the distribution of mineral between the vertebral body and the posterior elements contribute to the error in predicting vertebral body mineral with DPA. QCT gave a smaller error when a cylindric portion of the vertebral body with a 20 mm diameter was measured compared with one with a 9 mm diameter, when the dual energy technique was used (p<0.01). With dual energy QCT a correlation was found between a center segment of 3 vertebrae in the lumbar spine and the mean ash density of the vertebral body of r=0.92 (SEE=0.010 g/cm3). Single energy QCT was insignificantly less accurate than dual energy QCT. Only small differences were found between vertebrae with high fat density of the vertebral body when single or dual QCT was used. QCT was more accurate than DPA in the prediction of the mineral density of individual vertebral bodies (p<0.05) but no difference was found when the average values for the lumbar spine were calculated.

Quantitative dual-energy radiographic absorptiometry of the lumbar spine: in vivo comparison with dual-photon absorptiometry.

Radiology ◽  
1989 ◽  
Vol 170 (1) ◽  
pp. 129-131 ◽  
Author(s):  
J Borders ◽  
E Kerr ◽  
D J Sartoris ◽  
J A Stein ◽  
E Ramos ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Dual Energy ◽  
Dual Photon Absorptiometry ◽  
Photon Absorptiometry ◽  
Radiographic Absorptiometry

Reproductive hormones and bone mineral density in women runners

1992 ◽  
Vol 72 (6) ◽  
pp. 2149-2156 ◽  
Author(s):  
D. B. Snead ◽  
A. Weltman ◽  
J. Y. Weltman ◽  
W. S. Evans ◽  
J. D. Veldhuis ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Lumbar Spine ◽  
Steroid Hormones ◽  
Bone Mineral ◽  
Dehydroepiandrosterone Sulfate ◽  
Reproductive Hormones ◽  
Control Group ◽  
Dual Photon Absorptiometry ◽  
Mineral Density ◽  
Photon Absorptiometry

We examined the relationships among reproductive hormone concentrations and bone mineral density (BMD) in 43 women runners classified as eumenorrheic (n = 24), oligomenorrheic (n = 8), or amenorrheic (n = 11). Results were compared with a eumenorrheic nonrunner control group (n = 11). Serum 17 beta-estradiol, progesterone, and dehydroepiandrosterone sulfate concentrations were determined in daily blood samples for 21 days, and integrated concentrations (areas under the curve) were calculated. BMD was assessed at the lumbar spine and proximal femur by dual-photon absorptiometry. As expected, 17 beta-estradiol, progesterone, and lumbar spine BMD were higher in the control and eumenorrheic runner groups than in the oligomenorrheic and amenorrheic runner groups (P less than 0.05). Progesterone concentration was significantly correlated with lumbar spine BMD in the eumenorrheic runners (r = 0.61). None of the steroid hormones was significantly related to BMD in the oligomenorrheic/amenorrheic group. The present data suggest that circulating levels of gonadal steroid hormones affect axial BMD in eumenorrheic runners.

Comparison of bone mass measured by histomorphometry on iliac biopsy and by dual photon absorptiometry of the lumbar spine

Bone ◽  
1988 ◽  
Vol 9 (4) ◽  
pp. 209-213 ◽  
Author(s):  
P.D. Delmas ◽  
E. Fontanges ◽  
F. Duboeuf ◽  
G. Boivin ◽  
P. Chavassieux ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Bone Mass ◽  
Dual Photon Absorptiometry ◽  
Photon Absorptiometry
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