Accurate reestablishment system of helical CT based on CELL wide band engine

Abstract

The invention relates to a spiral CT accurate reconstruction system based on a CELL wide-frequency engine, which belongs to the technical field of image processing, wherein, the data collected by a projection collecting module is stored in a memorizer of a data collector after the pretreatment of filtering and eliminating noise, and waits for the alternation with a DMA control module; the DMA control module selects the projection data required by the reconstruction from the projection collecting module and transmits the data into an image construction module; the image construction module adopts a spiral CT accurate reconstruction algorithm, firstly, a construction result in a PI coordinate system is obtained by a filter back-projection or back-projection filter construction algorithm, and then, a result in a Cartesian coordinate system is converted by the coordinate conversion by resetting the construction result in the PI coordinate system, finally, the construction result is stored and the construction image is given by a display output module. The spiral CT accurate reconstruction system of the invention optimizes the realization of the accurate construction algorithm according to an instruction set of a Cell chip, so as to enhance the parallel efficiency and the speedup ratio and improve the performance of the construction system.

Description

technical field [0001] The invention relates to a system in the technical field of image processing, in particular to a helical CT accurate reconstruction system implemented in parallel based on a CELL broadband engine. Background technique [0002] Spiral CT has been widely used clinically. In CT examination, the object to be measured lies flat on the examination bed, and the X-ray source and X-ray detector are installed in the same gantry. When the gantry rotates, the examination bed moves linearly in the direction perpendicular to the gantry. In this way, the motion track of the X-ray source is a helical line when observed with the object to be measured as the reference system. The X-rays emitted by the X-ray source pass through the object to be measured, and the attenuated signal is received by the detector on the opposite side. The goal of CT imaging is to reconstruct a three-dimensional image from the received projection data. [0003] The Katsevich accurate reconstr...

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Problems solved by technology

[0005] According to the literature search of the prior art, it is found that the Chinese invention patent (application No. 200710041120.6) proposes a CT parallel reconstruction system, but the system uses MPI-based cluster computing technology, and the data between nodes in the reconstruction Interaction affects rebuild speed

With the improvement of reconstruction accuracy, the amount of projection data increases, and the data transmission between nodes will reduce the speedup ratio of the parallel reconstruction system

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