Sequence of positioning for prone pendulous DXA breast imaging.
Density step phantom (N17NS) used to calibrate the DXA device to units of glandular density and to perform a quality control. This phantom is composed by seven materials with x-ray absorption characteristics equivalent to 0,30,40,45,50,60,70, and glandular cladded by two water equivalent compartments.
DXA calibration phantoms designed in UCSF; picture (left) and low energy attenuation (right).
DXA calibration graph (for PA scans). The dots represent calibration measurements and the grid is composed of iso thickness and iso glandular curves computed fro Eqs. (1) and (2).
Material image of the DXA calibration phantoms shown in Fig. 3. The image gray scale is in units. Note that the gray scale values are proportional to percent fibroglandular density through the thickness range from 0 to .
Examples of examination of the same patient: mammographic density (left) and DXA (right) analysis. For this example and .
Left/right breast correlation.
Correlation between and .
Repeatability results using the N17NS phantom for prone pendulous positioning.
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