Method for reconstruction of an image of a moving object
AssigneeCommissariat a l'Energie Atomique
InventorsAnne Koenig, Pierre Grangeat
Life of this patent
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Abstract
A very fast reconstruction is undertaken in an image reconstruction process by tomography, by dividing measurements through the subject into a series of subsequent sets that are inverted by back projections giving partial result blocks used to search for the change law for the subject. Partial contents of the image can then be predicted at a reference time and their accumulation gives the image. The law for how the subject changes with time is evaluated and is used to compensate for partial results before their accumulation.
Claims11
Process for reconstruction of an image of a moving subject, including taking a set of successive measurements of the subject on projection rays passing through the subject, through a network (4) of detectors (5) at corresponding incidences around the subject, a measurement back projection step and a correction step following a subject change law, characterised in that the back projection step is made in several steps to give corresponding blocks (fb) of back projection results, each of the blocks grouping projection rays taken only for an angular sector of a turn of the detectors network using measurement quantities that are insufficient to genuinely express the required image;
- the subject change law is estimated based on the first images obtained by accumulating back projection blocks on at least half a turn of incidences of the detectors network;
- and the back projection result blocks are combined after they have been corrected using the subject change law to give the image at a reference time (tr).
Dependencies are inferred from the claim text.