Keywords:
Radiation physics, Computer applications, Cone beam CT, CT-Angiography, Physics, Computer Applications-3D, Image guided radiotherapy, Artifacts
Authors:
M. Elter, T. D. O. Lang, N. Maaß; Erlangen/DE
DOI:
10.1594/ecr2013/C-0496
Results
The proposed method was capable to fully correct individual misalignments of the horizontal detector offset u0 and the axis skew b for all datasets.
The full correction of the axis tilt a was possible for three of the five datasets.
Fig. 1 shows the central slice of the thorax phantom with a misaligned horizontal detector offset. Fig. 2 shows the same slice after applying the proposed misalignment correction method.
Fig. 3 shows a detail of the central slice of the head phantom with a misaligned axis skew. Fig. 4 shows the same detail after applying the proposed misalignment correction method.
The correction of joint misalignments of u0 and b was also successful.
Including misalginments of the less important parameter a had negative effects on the capability of the approach to correct the other two geometry parameters.