Evaluation of non-linear adaptive smoothing filter by digital phantom

Kazuhiro Sato, Mitsunori Goto, Hiroki Ishiya, Ryosuke Oshita, Issei Mori, Isao Yanagawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


As a result of the development of multi-slice CT, diagnoses based on three-dimensional reconstruction images and multi-planar reconstruction have spread. For these applications, which require high z-resolution, thin slice imaging is essential. However, because z-resolution is always based on a trade-off with image noise, thin slice imaging is necessarily accompanied by an increase in noise level. To improve the quality of thin slice images, a non-linear adaptive smoothing filter has been developed, and is being widely applied to clinical use. We developed a digital bar pattern phantom for the purpose of evaluating the effect of this filter and attempted evaluation from an addition image of the bar pattern phantom and the image of the water phantom. The effect of this filter was changed in a complex manner by the contrast and spatial frequency of the original image. We have confirmed the reduced effect of image noise in the low frequency component of the image, but decreased contrast or increased quantity of noise in the image of the high frequency component. This result represents the effect of change in the adaptation of this filter. The digital phantom was useful for this evaluation, but to understand the total effect of filtering, much improvement of the shape of the digital phantom is required.

Original languageEnglish
Pages (from-to)434-441
Number of pages8
JournalNippon Hoshasen Gijutsu Gakkai zasshi
Issue number4
Publication statusPublished - 2008 Apr 20

ASJC Scopus subject areas

  • Medicine(all)


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