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1、合肥國(guó)家同步輻射實(shí)驗(yàn)室 X 射線相位襯度成像取得重大突破
X 射線相位襯度成像是在世紀(jì)之交蓬勃發(fā)展起來新型成像技術(shù)， 它彌 補(bǔ)了傳統(tǒng) X 射線成像技術(shù)對(duì)輕元素材料不敏感的不足，為生命科學(xué)、 材料科學(xué)、 信息科學(xué)以及醫(yī)療診斷、 安全檢查和工業(yè)產(chǎn)品檢測(cè)等展現(xiàn) 了美好的應(yīng)用前景。然而，迄今為止發(fā)展的 X 射線相位襯度成像方 法太繁瑣、曝光時(shí)間過長(zhǎng)、 輻射劑量過高，阻礙了這種新型成像技術(shù) 的應(yīng)用。 中國(guó)科學(xué)技術(shù)大學(xué)國(guó)家同步輻射實(shí)驗(yàn)室吳自玉研究員領(lǐng)導(dǎo)的成像研 究小組，經(jīng)過幾年的努力，發(fā)現(xiàn) X 射線正面入射和背面入射的兩張 投影像中，吸收襯度具有對(duì)稱性，而折射襯度具有反對(duì)稱性。根據(jù)這 一原理，提出了 X
2、 射線相位 CT 新方法，實(shí)驗(yàn)結(jié)果表明新方法克服了 以往 X 射線相位襯度成像方法中的不足，具有簡(jiǎn)便、快速和低輻射 劑量的優(yōu)點(diǎn)， 可以和現(xiàn)有的醫(yī)學(xué) X 射線 CT 技術(shù)相結(jié)合， 形成操作簡(jiǎn) 便、輻射劑量低的 X 射線相位 CT 新技術(shù)。相關(guān)研究論文發(fā)表在最近 一期的 PNAS 期刊上 [PNAS 107, 13576 (2010)] ，被審稿人譽(yù)為 “近二 十年來 X 射線成像的重大突破 ”。這項(xiàng)研究成果受到國(guó)際同行的高度 關(guān)注，被今年 8 月在美國(guó)芝加哥舉行的第十屆 X 射線顯微術(shù)國(guó)際會(huì) 議(XRM 2010, Chicago)邀請(qǐng)做特邀報(bào)告，獲得國(guó)際多位著名 X射 線成像專家的高度評(píng)價(jià)，
3、一致認(rèn)為這項(xiàng)研究成果具有重大應(yīng)用前景。 另外,在 8 月份第十屆 X 射線顯微術(shù)國(guó)際會(huì)議上,中國(guó)科學(xué)技術(shù)大 學(xué)國(guó)家同步輻射實(shí)驗(yàn)室與上海光源聯(lián)手合作,高票贏得下一屆 2012 年 X 射線顯微術(shù)國(guó)際會(huì)議的舉辦權(quán)( XRM 2012 ,上海 -合肥)。
Breakthrough on X-ray Phase-contrast Imaging
National Synchrotron Radiation Laboratory (NSRL) ， University of Science and Technology of China made a great breakthrough in X-
4、ray phase-contrast computed tomography (CT) in 2010.
The simple, fast and low radiation dose X-ray phase-contrast CT technique was newly put forward by the research team led by Prof.
WU Ziyu, director of NSRL. It is developed based on the principle that the absorption contrast is the same but the
5、refraction contrast opposite between front projection and back projection. The new technique set the prerequisites for fast and low-dose phase-contrast X-ray imaging techniques in the future. The findings were published in PNAS, 107, 31, 13576-13581 (2010).
In comparison, the existing X-ray phase-c
6、ontrast imaging technique is subjected to long exposure time, high radiation dose and complicated operation, which impairs its wide application. Experiments show that the new technique can address all these shortages with lower radiation dose and simpler operation.
With its distinct advantages, the
7、 new technique has drawn worldwide attention. NSRL was invited to deliver a report on it in the 10th International Conference on X-ray Microscopy (XRM) in Chicago in August, 2010. The report was highly praised by famous experts who believed that the new technique would show great promise in the future.
During the conference, NSRL along with Shanghai Synchrotron Radiation Facility won the bid for hosting the next XRM conference (XRM 2012 ， Shanghai-Hefei ).
合肥國(guó)家同步輻射實(shí)驗(yàn)室X射線相位襯度成像取得重大突破.
