Medical Image Compression by Applying 3D DWT in PACS

来源 :Wuhan University Journal of Natural Sciences | 被引量 : 0次 | 上传用户:rinimalebi
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The process or image compression in a practical Picture Archiving and Communication System (PACS) was discussed with detail. To fully reduce the inter-slice correlation existing in the volumetric image sets generated by CT and MR, 3D Discrete Wavelet Transformation (DWT) was introduced in our applica-tion. Iustead or using a fixed quantizer of lossless low rrequency and distinct loss of high frequency, an adap-tive quantizer was devised taking MSE as the performance index. In the low frequency subband, DPCM was replaced with S+P trans form to facilitate coding computation. Compared with JPEG or 2D DWT, our method is 20 %-50% more erricient. Furthermore, preliminary tests showed that 33 dB may be the maximal distortion threshold for CT images. To fully reduce the inter-slice correlation existing in the volumetric image sets generated by CT and MR, 3D Discrete Wavelet Transformation (DWT) was introduced in our applica- tion. Iustead or using a fixed quantizer of lossless low rrequency and distinct loss of high frequency, an adap-tive quantizer was devised taking MSE as the performance index. In the low frequency subband, DPCM was replaced with S + P Compared with JPEG or 2D DWT, our method is 20% -50% more erricient. Furthermore, preliminary tests showed that 33 dB may be the maximal distortion threshold for CT images.
其他文献
柑橙是我县的主要果树,七十年代后,栽培面积和产量都增长很快,尤其是大批引种了温州蜜柑,柑橙生产提高到一个新的水平。据统计,1980年全县有果树498万株,其中柑橙351万株,占
目的:观察针刀松解配合三维牵引治疗腰椎间盘突出症的疗效.方法:对临床42例腰椎间盘突出症患者进行针刀松解配合三位牵引治疗,并进行疗效分析.结果:治愈23例,显效13例,好转4
有一次,小王咳嗽,去医院看病,可当他站在挂号大厅时,他懵了,在众多的科室中,该挂哪一科的号呢?其实,看病先挂号,挂号有诀窍!什么诀窍呢?很简单,就是分清一、二、三。 Once,
《指导意见》发布后,蓝筹股的机会之门已经敞开,蓝筹股前期振荡蓄势正是其后市潜力之所在。同时市场参与重组股热情将大大提高,为重组股后期行情埋下伏笔。尤其值得关注的是
目的:观察针刀配合火罐治疗腰三横突综合征的治疗效果. 方法:对49例腰三横突综合征患者采用针刀配合火罐治疗,对比前后病情变化,客观报道临床疗效. 结果:治愈35例(71.4
会议
当前,如何合理的确定果树负载量,防止大小年结果,实现高产、稳产、优质,应确定两个问题:一是找出一个树体负载量指标,二是找出一个较好的调节花、叶芽比例的办法。我们经过1
目的:比较应用肌筋膜经线理论和"阿是穴"理论进行手法治疗第三腰椎横突综合征的临床疗效.方法:将第三腰椎横突综合征患者60人,随机分成对照组和实验组,对照组采用传统手法,实
会议
油桐是我国特有的工业油料树种。解放以来,我省油桐生产发展很快,南阳、信阳、许昌、洛阳等地区有三十多个县有油桐分布,面积已达150万亩,但单产很低。从1981年产量看,南阳
最近,在房管局工作的徐女士将中大文锦苑的一套2003年的学军小学的学区房在中介公司挂售,标价仅为2.9万元/平方米,而中大文景苑房屋的成交均价普遍在3.2万元—3.3万元/平方米
会议