Figure 1.
Completed ROI placement in axial CT slice of quality assurance and CT calibration reference phantoms positioned for QA studies.
Figure 2.
A) axial, B) sagittal and C) coronal images of segmented bone in proximal femur, rotated into a standard projection.
Figure 3.
CTXA proximal femur ROI positions.
CTXA projected image with standard regions of interest used for BMD calculations (femoral neck, trochanter, intertrochanter, and Total Hip as sum of these three regions). Position of femoral neck box and intertrochanter limit line at base of lesser trochanter, and rotation of femoral neck axis, are adjustable by user. Ward's Triangle ROI is displayed but not used in comparisons.
Table 1.
Summary of Long-Term In Vivo Precision, CTXA vs. DXA, in Osteoporotic Subjects.
Table 2.
Interobserver Comparison of CTXA BMD Estimates (g/cm2).
Figure 4.
Correlation of area BMD for CTXA and DXA for total hip region of interest.
Figure 5.
Correlation of area BMD for CTXA and DXA for femoral neck region of interest.
Table 3.
Correlation of CTXA Hip and DXA BMD Results (Site 1, Manchester; Site 2, Schenectady).