aaa根據(jù)一項(xiàng)新研究，最近開發(fā)的數(shù)字技術(shù)使計(jì)算機(jī)控制X線斷層掃描術(shù)(CT)技術(shù)推進(jìn)了一大步。

InstaRecon (Urbana, IL, USA) 的研究者們已經(jīng)設(shè)計(jì)出可以提供幾乎所有瞬間、實(shí)時(shí)重建復(fù)雜三維圖像的運(yùn)算法則。新的CT系統(tǒng)可以在10妙內(nèi)掃描整個(gè)身體，收集4000個(gè)圖像平面的數(shù)據(jù)。然而，這些圖像的重建仍舊滯后，需要幾分鐘。Yoram Bresler，InstaRecon的主席說：“我們的目標(biāo)是加速圖像重建的速度，以至于能在數(shù)據(jù)收集的同時(shí)成像。”

實(shí)時(shí)重建對(duì)諸如X線透視檢查等醫(yī)學(xué)程序來說是很重要的，借此臨床醫(yī)生可以將導(dǎo)管移動(dòng)至心臟。“醫(yī)生需要能在導(dǎo)管移動(dòng)的時(shí)候看到他，”Bresler先生解釋說，“醫(yī)生不能容忍圖像重建中的延遲，否則他們將不能知道導(dǎo)管在當(dāng)下的確切位置。通過我們的方法，我們可以通過從10到100的因子加速圖像重建，從而使實(shí)時(shí)、完整的3D效果成為可能。”

不僅圖像重建的完成速度更快，并且，更重要的是，從長(zhǎng)遠(yuǎn)來看病人能更少的接受X線的照射。如果數(shù)據(jù)重建能更快完成的話，放射劑量就能減少。通過這個(gè)來自InstaRecon運(yùn)算法則的速度加速技術(shù)，CT掃描系統(tǒng)就能做到。CT掃描能數(shù)倍提升計(jì)算速度，以難以置信的速度運(yùn)行，減少必須接受的放射劑量。

速度的增快還可以幫助世界范圍內(nèi)的安全代理商掃描更多的包裹和集裝箱。InstaRecon最先在Urbana-Champaign伊利諾伊州大學(xué)（USA）開展研究，在那里調(diào)查人員設(shè)計(jì)出最快的圖像重建運(yùn)算法則。這項(xiàng)技術(shù)受到6個(gè)美國(guó)的保護(hù)，在全世界范圍內(nèi)處于申請(qǐng)期。

Breakthrough in CT Speed 
 
Newly developed mathematical techniques have given a big boost to computed tomography (CT) technology, according to new research.

Researchers at InstaRecon (Urbana, IL, USA) have devised algorithms that can provide almost instantaneous, real-time reconstruction of complicated, three-dimensional (3D) images. Newer CT systems can scan the whole body in 10 seconds, gathering data for 4,000 image slices. However, reconstruction of those images still falls behind, taking several minutes. “Our goal has been to speed up the image reconstruction so it happens at the same time that the data are collected,” stated Yoram Bresler, president of InstaRecon.

Real-time reconstruction is important in medical procedures such as fluoroscopy, in which clinicians move a catheter through the heart. “Doctors need to be able to see the catheter as it’s moving,” explained Mr. Bresler. “Doctors cannot tolerate a delay in image reconstruction or they will not know exactly where the catheter is at any given moment. With our method, we can speed up image reconstruction by a factor of 10 to 100, so it should be possible to have full 3D resolution in real-time.”

Not only would the image reconstruction be performed quicker, but, maybe even more important, patients may receive less exposure to x-rays in the long run. Radiation dose can be decreased if the devices are able to reconstruct the data much faster, correcting the results each time. With this speed enhancement technology from the InstaRecon algorithms, CT scanning systems will be able to provide this. CT scanners will be able to compute images many times over, at incredible speeds, reducing the required radiation dose.

Increased speed would also help security agents worldwide scan more packages and containers. InstaRecon had its beginnings at University of Illinois at Urbana-Champaign (USA), where the investigators devised the fast image reconstruction algorithms. The technology is protected by six U.S. patents, with many others pending worldwide.