[Adaptive Wiener filter based on Gaussian mixture distribution model for denoising chest X-ray CT image].
In recent decades, X-ray CT imaging has become more important as a result of its high-resolution performance. However, it is well known that the X-ray dose is insufficient in the techniques that use low-dose imaging in health screening or thin-slice imaging in work-up. Therefore, the degradation of CT images caused by the streak artifact frequently becomes problematic. In this study, we applied a Wiener filter (WF) using the universal Gaussian mixture distribution model (UNI-GMM) as a statistical model to remove streak artifact. In designing the WF, it is necessary to estimate the statistical model and the precise co-variances of the original image. In the proposed method, we obtained a variety of chest X-ray CT images using a phantom simulating a chest organ, and we estimated the statistical information using the images for training. The results of simulation showed that it is possible to fit the UNI-GMM to the chest X-ray CT images and reduce the specific noise.
Department of Radiology, Konko Hospital Dojinkai, Division of Industrial Innovation Science, Okayama University Graduate School of Natural Science and Technology.
Motohiro
M
Tabuchi
Nobumoto
N
Yamane
Yoshitaka
Y
Morikawa
D015233:Models, Statistical; D016011:Normal Distribution; D019047:Phantoms, Imaging; D013902:Radiography, Thoracic / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*