Neutron radiography and tomography can trace the propagation of small amounts of hydrogenous
substances within metallic casings (e.g. a combustion engine) or rock and soil matrices. Exactly triggered radiographs with short exposures can take snapshots of rapid periodic processes. Many short exposures must be usually summed in order to achieve sufficient image contrast. Non-periodic
processes may also be observed if the neutron flux intensity is high and the neutron detector permits acquiring images at sufficiently
high frame rate.
Dynamic processes pose an additional challenge to the acquisition of tomographies. Normally, the sample is not allowed to change during the scan. Otherwise, motion artifacts will appear. By changing the order in which the projections are acquired, it is still possible to obtain useful spatio-temporal data even though the sample is changing during the scan.
Dynamic processes pose an additional challenge to the acquisition of tomographies. Normally, the sample is not allowed to change during the scan. Otherwise, motion artifacts will appear. By changing the order in which the projections are acquired, it is still possible to obtain useful spatio-temporal data even though the sample is changing during the scan.
Figure 2: Humidity exchange between small spheres followed in 3D over time.
Reference
Spatiotemporal computed tomography of dynamic processes
Kaestner, A; Munch, B; Trtik, P; Butler, L (2011)
OPTICAL ENGINEERING 50 , 12 , 123201
DOI:10.1117/1.3660298
Kaestner, A; Munch, B; Trtik, P; Butler, L (2011)
OPTICAL ENGINEERING 50 , 12 , 123201
DOI:10.1117/1.3660298