原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2009年
11期
1034-1038
,共5页
针孔SPECT图像重建%OSEM算法%针孔响应修正
針孔SPECT圖像重建%OSEM算法%針孔響應脩正
침공SPECT도상중건%OSEM산법%침공향응수정
pinhole SPECT image reconstruction%OSEM algorithm%pinhole response correction
采用一种新颖的查找表法来实施有序子集期望值最大化(OSEM)的针孔SPECT图像重建算法,有效地将针孔响应修正包含在查找表中,进而实现高分辨针孔SPECT的三维图像重建.标准Jaszczak模具的成像实验结果表明:该方法不但能显著减少图像重建过程的计算时间和内存占用,且能显著改善重建图像的分辨率.因此,查找表法是能够快速实现针孔SPECT OSEM图像重建算法,并能将针孔响应修正包含在查找表中以获取高分辨断层图像的有效方法.
採用一種新穎的查找錶法來實施有序子集期望值最大化(OSEM)的針孔SPECT圖像重建算法,有效地將針孔響應脩正包含在查找錶中,進而實現高分辨針孔SPECT的三維圖像重建.標準Jaszczak模具的成像實驗結果錶明:該方法不但能顯著減少圖像重建過程的計算時間和內存佔用,且能顯著改善重建圖像的分辨率.因此,查找錶法是能夠快速實現針孔SPECT OSEM圖像重建算法,併能將針孔響應脩正包含在查找錶中以穫取高分辨斷層圖像的有效方法.
채용일충신영적사조표법래실시유서자집기망치최대화(OSEM)적침공SPECT도상중건산법,유효지장침공향응수정포함재사조표중,진이실현고분변침공SPECT적삼유도상중건.표준Jaszczak모구적성상실험결과표명:해방법불단능현저감소도상중건과정적계산시간화내존점용,차능현저개선중건도상적분변솔.인차,사조표법시능구쾌속실현침공SPECT OSEM도상중건산법,병능장침공향응수정포함재사조표중이획취고분변단층도상적유효방법.
In order to achieve high-resolution pinhole SPECT image reconstruction, a novel lookup table (LUT) method was implemented in the ordered subsets expectation maximization (OSEM) algorithm including an effective compensation of the pinhole response. A standard Jaszczak phantom was used to evaluate the reconstruction algorithm. The results show that the OSEM algorithm with the LUT method can significantly reduce the CPU time and the usage of memory, and provide significant improvement of the spatial resolution of the reconstructed image. In conclusion, the LUT method with pinhole response corrections in LUT is an effective approach to implement OSEM algorithm for high-resolution pinhole SPECT image reconstruction.
