公开(公告)号：US06920240B2

公开(公告)日：2005-07-19

申请号：US10048336

申请日：2001-06-07

申请人： Thomas Rodet ,  Pierre Grangeat ,  Laurent Desbat

发明人： Thomas Rodet ,  Pierre Grangeat ,  Laurent Desbat

IPC分类号： G06T11/00 ,  G06K9/00

CPC分类号： G06T11/005 ,  G06T2211/421

摘要： Sets of projections of measurements through an object (1) the image of which is to be represented, undergo Fourier transforms before being broken down into blocks according to cutoff frequencies. The blocks are separately reconstructed in order to form a series of thumbnail images of the object, which are then combined in order to reconstruct the final image. The reconstruction calculations on the thumbnail images are rapid and often a large portion of the blocks will be discarded, notably those which are at high frequencies, whereby their contribution may frequently be neglected as well as the noise effects which accumulate therein.The invention is applied to medical or industrial tomography methods and is of larger interest for mobile objects, the movement of which may be estimated and compensated.

摘要翻译： 通过其图像要被表示的对象（1）的测量的投影的集合在根据截止频率被分解成块之前进行傅里叶变换。 为了形成一系列的对象的缩略图，单独地重建这些块，然后将其组合以便重构最终的图像。 缩略图上的重建计算是快速的，并且通常大部分的块将被丢弃，特别是那些处于高频率的块，其中它们的贡献可能经常被忽略以及在其中积累的噪声效应。 本发明应用于医疗或工业层析成像方法，并且对移动物体具有较大的兴趣，其运动可以被估计和补偿。

公开(公告)号：US20060147097A1

公开(公告)日：2006-07-06

申请号：US10530854

申请日：2003-10-14

申请人： Pierre Grangeat ,  Thomas Rodet ,  Laurent Desbat

发明人： Pierre Grangeat ,  Thomas Rodet ,  Laurent Desbat

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  G06T2211/421

摘要： A calculation for reconstructing tomographic images involves the decomposition of two-dimensional sets of projections of this image by a wavelet decomposition method, in which the set of projections is separated into thumbnail images expressing the whole and the higher frequency details of the projections, respectively. The reconstruction is carried out separately on the thumbnail images before making a combination. Certain properties of this decomposition, notably in the Fourier frequency domain, provide substantial reduction of the amount of calculations.

摘要翻译： 用于重建断层图像的计算涉及通过小波分解方法对该图像的二维投影集进行分解，其中将该组投影分成表示整体的缩略图和投影的较高频率细节。 在进行组合之前，在缩略图上分别进行重建。 这种分解的某些特性，特别是在傅里叶频域中，提供了大量的计算量的减少。