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Title :A novel noise reduction filter for improving visibiligy of early CT signs of hyperacute stroke: evaluation of the filter's performance : Preliminary clinical experience
Authors :Takahashi, Noriyuki
Lee, Yongbum
Tsai, Du-Yih
Ishii, Kiyoshi
Publisher :Springer Berlin/Heidelberg
Issue Date :Jun-2007
Journal Title :Radiation Medicine
Volume :25
Issue :5
Start Page :247
End Page :254
ISSN :1862-5274
Description :Purpose: To evaluate the performance of a novel noise reduction filter for improving the visibilty of early CT signs of hyperacute stroke on nonenhanced CT images. Material and Methods: Fourteen patients with middle cerebral artery occlusion within 4.5 hours after onset were used for evaluations. Signal-to-noise ratio (SNR) of the processed images with the noise reduction filter and that of original images were measured. Moreover, two neuroradiologists visually rated all the processed and original images on the visibility of normal and abnormal gray-white matter interface. Results: The SNR value of the processed images was approximately eight times as high as that of the original images, and a 87% reduction of noise was achieved using this technique. In the visual assessment, the results showed that both the visibility of normal gray-white matter interface and that of the loss of the gray-white matter interface were significantly improved by using the proposed method (p<0.05). Conclusion: The noise reduction filter proposed in the present study has the potential to improve the visibility of early CT signs of hyperacute stroke on nonenhanced CT images.
Keywords :Computed tomography
Infarction
Computer application
Adaptive smoothing filter
Type Local :学術雑誌論文
Language :eng
URI :http://hdl.handle.net/10191/6247
URL :http://springerlink.metapress.com/content/120103/
fullTextURL :http://dspace.lib.niigata-u.ac.jp/dspace/bitstream/10191/6247/1/05_0002.pdf
DOI :http://dx.doi.org/10.1007/s11604-007-0129-3
Appears in Collections:10 査読済論文 = Postprint

Please use this identifier to cite or link to this item: http://hdl.handle.net/10191/6247