Intensity Inhomogeneity Correction of Magnetic Resonance Images using Patches.

Intensity Inhomogeneity Correction of Magnetic Resonance Images using Patches.
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DOI:
10.1117/12.877466
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发表时间:
2011-03-11
期刊:
Proceedings of SPIE--the International Society for Optical Engineering
影响因子:
--
通讯作者:
Prince JL
Prince JL
中科院分区:
其他
文献类型:
--
作者:
Roy S;Carass A;Bazin PL;Prince JL

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本文提出了一种基于块的非参数方法来校正人脑磁共振图像的强度不均匀性。在图像采集期间,射频线圈中存在的不均匀性通常在重建的MR图像上表现为平滑阴影效应。这种伪影可以显著地恶化使用强度作为特征的任何种类的图像处理算法的性能。大多数目前的非均匀性校正技术使用显式的平滑假设的非均匀性领域,这有时会限制他们的性能,如果实际的非均匀性是不顺利的,一个问题,成为普遍存在的高领域。所提出的基于块的不均匀性校正方法不假设任何参数平滑模型,而是使用来自无不均匀性图像的图谱的块来进行校正。初步结果表明,所提出的方法是与N3,目前的最先进的方法,当不均匀性是光滑的,并优于N3时,不均匀性包含非光滑元素。
This paper presents a patch-based non-parametric approach to the correction of intensity inhomogeneity from magnetic resonance (MR) images of the human brain. During image acquisition, the inhomogeneity present in the radio-frequency coil, is usually manifested on the reconstructed MR image as a smooth shading effect. This artifact can significantly deteriorate the performance of any kind of image processing algorithm that uses intensities as a feature. Most of the current inhomogeneity correction techniques use explicit smoothness assumptions on the inhomogeneity field, which sometimes limit their performance if the actual inhomogeneity is not smooth, a problem that becomes prevalent in high fields. The proposed patch-based inhomogeneity correction method does not assume any parametric smoothness model, instead, it uses patches from an atlas of an inhomogeneity-free image to do the correction. Preliminary results show that the proposed method is comparable to N3, a current state of the art method, when the inhomogeneity is smooth, and outperforms N3 when the inhomogeneity contains non-smooth elements.
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