Temporal Scalability of Dynamic Volume Data Using Mesh Compensated Wavelet Lifting

Temporal Scalability of Dynamic Volume Data Using Mesh Compensated Wavelet Lifting
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使用网格补偿小波提升的动态体数据的时间可伸缩性

DOI:
10.1109/tip.2017.2762586
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发表时间:
2018
影响因子:
10.6
通讯作者:
A. Kaup
A. Kaup
中科院分区:
计算机科学1区
文献类型:
--
作者:
W. Schnurrer;N. Pallast;T. Richter;A. Kaup

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由于它们的高分辨率,来自计算机断层扫描(CT)和磁共振断层扫描(MR)的动态医学2D+t和3D+t体积达到使得它们对于远程放射学应用非常不方便的尺寸。无损可缩放表示提供了可用于定向或预览的缩小版本的优点,而用于重建全分辨率的剩余信息则按需传输。小波变换提供了所需的可扩展性。低通子带的非常高的质量是至关重要的,以便将其用作按比例缩小的表示。我们提出了一种基于补偿小波提升的方法,用于获得具有非常高质量的动态CT和MR体积的可扩展表示。网格补偿是可行的,以模拟动态体积中的位移,这主要是由随着时间的推移,组织的膨胀和收缩。为了实现这一点,我们提出了一个优化的网格补偿参数的估计,以最佳地适应动态卷。在提升结构中,运动补偿的反转在更新步骤中是至关重要的。我们建议在估计步骤中直接考虑这种反转,并且对于我们所测试的动态CT和MR体积,可以平均将低通子带的质量提高0.63和0.43 dB,代价是平均将速率提高2.4%和1.2%。
Due to their high resolution, dynamic medical 2D+t and 3D+t volumes from computed tomography (CT) and magnetic resonance tomography (MR) reach a size which makes them very unhandy for teleradiologic applications. A lossless scalable representation offers the advantage of a down-scaled version which can be used for orientation or previewing, while the remaining information for reconstructing the full resolution is transmitted on demand. The wavelet transform offers the desired scalability. A very high quality of the lowpass sub-band is crucial in order to use it as a down-scaled representation. We propose an approach based on compensated wavelet lifting for obtaining a scalable representation of dynamic CT and MR volumes with very high quality. The mesh compensation is feasible to model the displacement in dynamic volumes which is mainly given by expansion and contraction of tissue over time. To achieve this, we propose an optimized estimation of the mesh compensation parameters to optimally fit for dynamic volumes. Within the lifting structure, the inversion of the motion compensation is crucial in the update step. We propose to take this inversion directly into account during the estimation step and can improve the quality of the lowpass sub-band by 0.63 and 0.43 dB on average for our tested dynamic CT and MR volumes at the cost of an increase of the rate by 2.4% and 1.2% on average.
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