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- X – pointing from IP to the north,
- Y – pointing from IP to the top, and
- Z – pointing from IP along the photon beam propagation direction.,
as shown in the plot:
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Each photon with sample collision happens in different place... IP is an abstract position of the crossing point of the "beam line" and "target", which both are not well defined... Is it really good definition? |
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Components of these three unit vectors form the matrix e, where indexes "i" and "j" corresponds to the vector components in the setup and detector local coordinate frames, respectively. Within this definition 3-d pixel coordinate "c" from in the detector frame can be easily transformed to the setup coordinate "C" :using equationij
Ci=eij·cj + Pi.
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