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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: J Xray Sci Technol. 2012 Jan 1;20(1):17–29. doi: 10.3233/XST-2012-0316

Table 1.

The speck width and the voxel intensity of 0.54 mm top speck for six isocenter horizontal-shifts

Isocenter shift 0 shift 2 pixel shift 4 pixel shift 6 pixel shift 8 pixel shift 10 pixel shift
Uncalibrated width 3 pixels 3 pixels 3 pixels 3 pixels 4 pixels 4 pixels
Calibrated width 3 pixels 3 pixels 3 pixels 3 pixels 3 pixels 3 pixels
Uncalibrated intensity 0.54 0.52 0.48 0.47 0.45 0.42
Calibrated intensity 0.55 0.54 0.52 0.52 0.51 0.49