Direct detection of small motion from dynamic computed tomography images

In this paper, we present a new and precise method to detect small motions directly from the raw data of the X-ray scan, called sinograms. The application for which the method has been developed, namely the detection of the wall motion of intracranial aneurysm, will be presented and the required verification process will be showed with results.This direct motion detection method has the advantage of eliminating any unnecessary calculation, by directly using the sinograms, instead of the reconstructed image. Such error elimination is particularly important in critical applications, like the medical diagnostics, and for small motions, such as the motion of the wall of a body organ.The performance of the method is evaluated by comparison with digital and physical phantoms.