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Table 2 Parameter values before, during, and after calibration

From: Multimodality calibration for simultaneous fluoroscopic and nuclear imaging

Parameter Pinhole nr. Direct physical measurement (before) Calibration pinhole positions (step 1) Calibration effective size x-ray detector (step 2) Calibration position x-ray detector
(step 3)
x pinhole (cm) 1 −5.40 −5.527 ± 0.001 * *
2 −5.50 −5.488 ± 0.020 * *
3 5.40 5.291 ± 0.020 * *
4 5.50 5.551 ± 0.005 * *
y pinhole (cm) 1 −8.90 −8.810 ± 0.007 * *
2 8.90 8.911 ± 0.020 * *
3 −9.15 −9.094 ± 0.036 * *
4 9.15 9.057 ± 0.049 * *
d x-ray detector (cm)   22.86 22.86 21.39 ± 0.02 *
x x-ray detector (cm)   0.00 0.00 0.00 −1.14 ± 0.07
y x-ray detector (cm)   0.00 0.00 0.00 0.16 ± 0.03
  1. The center of the coordinate system was the center of the scintillation crystal surface. The z axis was perpendicular to the scintillation crystal surface and pointed towards the x-ray detector
  2. Asterisks (*) indicate that the parameter value was unchanged with respect to the previous calibration step