Jun 25 – 29, 2023
Ole-Johan Dahls Hus
Europe/Oslo timezone

P2.32: X-ray computed tomography of the periodically moving object

Jun 28, 2023, 5:12 PM
Ole-Johan Spiseri (Ole-Johan Dahls Hus)

Ole-Johan Spiseri

Ole-Johan Dahls Hus

Ole Johan Dahls Hus - Oslo Science Park Gaustadalléen 23B, 0373 Oslo


Daniel Vavrik


X-ray computed tomography is now a common method of non-destructive testing of a wide range of static objects. In recent years, time-dependent tomography has been on the rise, for which it is necessary to record a series of tomographic data covering the event of interest. For slower events, conventional laboratory CT scanners can be used, while when events are faster, a very intense X-ray source is usually required. For high resolution requirements, the need for an intense X-ray source leads to the use of a synchrotron. This is because it is clear that in the case of an insufficiently intense X-ray source, the statistics in a single X-ray image are too low and a high quality tomographic reconstruction cannot be achieved. An exception is tomographic tracking of periodic events. As will be shown, for these, a good quality reconstruction can be achieved even in the case of a relatively low-intensity X-ray source. A crucial condition is the precise synchronization of all components of the system. While sufficient statistics in a single projection is achieved by integrating very short images acquired at an identical position of the moving object. In all cases, it is necessary to have an imaging detector with a sufficiently high frame rate, accurate synchronization via a common trigger signal and the possibility of very short exposure times.

Tomography of a periodically moving sample with a frequency of 4 Hz and an amplitude of 2.5 mm was performed using a Dexela 1512NDT detector. The resulting tomographic reconstruction has almost the same quality as in the case of tomography of a static object. The Dexela detector with 2x2 binning has a minimum exposure time of 25 ms, using external HW triggering. As an alternative, a 2x5 MPX3 detector with a sensor thickness of 500 mm was tested, which has excellent temporal resolution and thus allows tomography at higher frequencies.

Primary author


Tomas Fila (Czech Academy of Sciences, Institute of Theoretical and Applied Mechanics) Dr Petr Koudelka (Czech academy of sciences, Institute of theoretical and applied mechanics) Dr Michal Machacek (Czech academy of sciences, Institute of theoretical and applied mechanics) Vaclav Rada (Czech academy of sciences, Institute of theoretical and applied mechanics) Dr Jan Zemlicka (Czech Technical University in Prague (CZ)) Dr Pert Zlamal (Czech academy of sciences, Institute of theoretical and applied mechanics)

Presentation materials