The device together with details of the marker (A) and of the moving lateral bar (B,C) and auricular pipes (D). In details C and D the graduate scales are visible.
The device worn by a volunteer.
The Alderson Rando phantom wearing the device.
The marker was stepped through the CT scanner in increment. The position of the marker centroid (measured position) and the true position are compared; the slope of the rectilinear fit is 1,07.
The marker was stepped through the SPECT scanner in submillimeter increment. The position of the marker centroid (measured position) and the true position (read on the micrometric screw) are compared; the slope of the rectilinear fit is 1,06.
Differences between the , and coordinates of the seven fiducial markers in the base line and in the 14 CT registered studies. Between two adjacent vertical lines the results of each of the 14 repeated tests are reported.
Residual differences between the fiducial marker positions in the base line and the 14 CT registered studies. The seven points encompassed between two adjacent vertical lines represent the results of each test.
Three selected SPECT and CT registered images of the Hoffman brain phantom. The vertical arrows point to the three fiducial markers while the horizontal arrows indicate three device markers. In CT registered data the two small points outside the phantom, visible in the last two images, represent the lateral bars of the device.
Registration parameter differences. Minimum and maximum differences between the rotation and translation parameters obtained using the device markers and the fiducial markers together with the mean (and standard deviation) of the absolute value of the differences. The symbols rot, rot, rot represent the rotations around the three Cartesian axes while , , indicate the translation along the three axes.
Maximum, minimum and mean absolute values of the differences , , and between the fiducial marker positions evaluated in the base line and in the 14 CT registered studies.
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