Einführung in die medizinische Bildverarbeitung SS 2013

y interpolation of non-missing neighbor projections. volume increases. This can be particularly seen in pat
Rajgopal et al. [14] used a linear prediction method to replace with mass body. Artifacts arise because some part
the Grundlagen missing projections. - Bilderzeugung
In other work [15], a polynomial individual projection can be very noisy due to insuffi
interpolation Computertomographie technique International is used to Journal Artefakte
bridge of Biological the missing and Life photons Sciences passing 4:3 2008 through widest part of patient. Fig. 3
projections. A wavelet multiresolution analysis of projection shows these projects in the projection matrix for a pat
data is also proposed to detect the missing data and interpolate When these projects are reconstructed by standard algor
them ‣[16].
Verringerung der Artefakte durch of Bildverarbeitung
scanner, the noise is magnified, resulting in streaks in
direction of widest part (Fig. 3 (b)).
(a)
(a)
(a)
(a)
(b)
Fig. 2 Result of applying the method proposed in [18] for reduction
(b)
of © metallic Stephan artifacts; Gimbel a) original CT image, Einführung b) modified in CT die image medizinische artifact, Bildverarbeitung
h_da
Fig. b) 3 Example modified of image photon with starvation removal artifact; artifact a) matrix (images of project are
(b)
[Quelle: Yazdi, Beaulieu - Artifacts in Spiral X-ray CT Scanners]
(b)
Fig. 5 Example of patient motion artifact; a) original image wit