Sep 26, 2011 to provide evidence for the selection of an optimal crosssectional reconstruction mode in spectral ct imaging of the abdomen, we compared the monochromatic images with polychromatic images. Multimaterial decomposition using statistical image. This unique technology is capable of counting individual xray photons while rejecting noise, rather than simply integrating the electrical signal in each pixel. Methods three phaseenhanced ct scans of the abdomen were recorded using the spectral imaging technique on 100 patients. The purpose of this paper is to develop an algorithm for hybrid spectral computed tomography ct which combines energyintegrating and photoncounting detectors.
While the energyintegrating scan is global, the photoncounting scan can have a local field of view fov. This can improve image quality and reduce dose requirements. Joint reconstruction of multichannel, spectral ct data via. Which is the best software for 3d reconstruction from ct cbct images. Philips ct scanners solutions overview philips healthcare. For all of the possibilities and enhancements that spectral imaging offers, many say it is still working its way into imaging departments. Where can i get a spectral xray computed tomography ct. We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services. Spectral ct with metal artifacts reduction software for improvement of. The current reconstruction software adopted by the mars team is octopus ct by inct systems 2. Castor customizable and advanced software for tomographic. Yet, dedman says that with dualsource spectral ct systems, the two tubes essentially double the power, making it possible to image bariatric patients weighing up to and possibly beyond 400 lbs.
Multimaterial decomposition using statistical image reconstruction for spectral ct yong long and jeffrey a. In many recent spectral ct reconstruction papers, intensitygradient sparsity constraints are often supplemented with an additional structural redundancy constraint 2. An upcoming spectral ct technology, which is gaining clinical. In recent years, the development of spectral ct, in which the energy dependence of the xray attenuation coe cient is utilized, has attracted considerable interest. Low rank and sparsity prior is used for spectral ct reconstruction. In fact, it took until 2009 for the first iterative reconstruction algorithms to come commercially available and replace conventional filtered back projection. Michigan image reconstruction toolbox mirt the michigan image reconstruction toolbox mirt is a collection of open source algorithms for image reconstruction and related imaging problems written in mathworks matlab language. The evolution of image reconstruction for ctfrom filtered. Our proprietary 3d imaging products are used by ct and microct scanner manufacturers and endusers of ct scanners to improve image quality, reduce or eliminate artifacts, accelerate image reconstruction, and decrease scan time. Since then, this technique has caused a true hype in the field of radiology. Total image constrained diffusion tensor for spectral. What sets iqon apart is that it uses a singlesource. May 14, 2019 in laymans terms, a ct system equipped with gsi, or another spectral imaging product, will take data sets at two levels of xray power in a single scan. Photon counting detector pcdbased spectral computed tomography ct is a promising imaging technique that enables high energy resolution imaging with narrow energy bins.
To evaluate spectral computed tomography ct with metal artifacts reduction software mars for reduction of metal artifacts associated with gold fiducial seeds. Spekcalc software 28, considering a tube voltage of 120 kv, a 12. Philips introduced its iqon spectral ct solution at the 20 radiological society of north america rsna annual meeting in chicago, and the system received u. Mar 29, 2017 set of functions performing ct reconstruction tasks like a radon transformation, a simple backprojection, a filtered backprojection using a convolution in the spatial domain, a filtered backprojection using a 2d fourier transformation, and a filtered back projection using the central slice theorem. Jun 05, 2019 in other words, its a ct system with spectral imaging that will take data sets a two levels of xray power in a single scan. Spectral ct and mars reconstruction were performed on the scanner workstation. Whereas conventional single energy ct produces a single image set, dual energy data attenuation values at two. Full software license highend, multiprocessor ct reconstruction and 3d visualization workstation complete user guide, documentation and calibration tools. Redundancy constraints exploit the coherence in image structure between spatially localized spectral samples to further improve the robustness of regularization.
Spectral xray ct image reconstruction with a combination of. An xray spectrum was generated using an open source software package. In multi spectral ct mct, the appropriate consideration of the spectral responses leads to a nonlinear data model, and image reconstruction by solving the nonlinear data model remains a topic. Pdf optimizationbased reconstruction exploiting spectral. Spectral ct is a way to visualize tissue composition with ct. The two data sets are then compared within the image reconstruction software and offer an additional level of detail. Food and drug administration fda has cleared siemens syngo.
The main reason that spectral ct is still a budding technology, according to sahney, is largely a matter of perception. Clark dp, badea ct 2017 hybrid spectral ct reconstruction. Spectral ct with metal artifacts reduction software for. Xray computed tomography ct is a medical imaging modality that allows reconstruction of the internal stucture of the human body from a large number of xray attenuation measurements.
In the present spectral ct system based on fast peak kilovoltage switching technology, there are two crosssectional image reconstruction modes available. Spectral ct reconstruction with weighted nonlocal total. In laymans terms, a ct system equipped with gsi, or another spectral imaging product, will take data sets at two levels of xray power in a single scan. A code for reconstruction and spectral analysis of spectral domain oct images. Spectral image reconstruction can include image types such as monoenergetic monoe, iodine quantification, and images that map the effective atomic number of the tissues in question. The algorithm synthesizes both spectral data and energyintegrating data. We can determine the atomic number of the tissues in the body. Introducing gsi xtream on revolution ct, 1 the first volume spectral ct technology designed to improve small lesion detection, tissue characterization and metal artifact reduction, with a simplified workflow you can make part of your daily practice.
Simultaneous iterative reconstruction technique software for. In fact, it took until 2009 for the first iterative reconstruction algorithms to. Because these two data sets can be compared within the image reconstruction software, it delivers an additional level of image detail. Therefore, image reconstruction in spectral ct is considered to be a. To achieve highquality material composition images and further suppress the xray beam hardening artifacts, we first propose a onestep material reconstruction model based on taylors firstorder expansion. The toolbox apps generally take a set of projections xray intensity measurements and filter and back project them in order to recreate the image or volume that the projections represent. Ct single source dual energy software package, that enables spectral imaging using which is designed to operate with ct images acquired with siemens single source ct scanners. Please sign up with science hr to see all job details. Spectral computed tomography ct has a great potential in material identification and decomposition. Spectral ct with metal artifacts reduction software for improvement of tumor visibility in the vicinity of gold fiducial markers. It is central to the safe and appropriate use of ct and is now included in some regulations including the standards of accrediting bodies.
Vmi images were generated using the ge commercial software at 10 kev. Oct 30, 2018 the first ct scanners in the early 1970s already used iterative reconstruction algorithms. This channel includes content on ct scanners, ct contrast agents, ct angiography cta and ccta, ct perfusion, spectral ct also called dual souce or dual energy ct, and interative image reconstruction. An upcoming spectral ct technology, which is gaining clinical interest, is photoncounting ct pcct. Another benefit of spectral ct, dedman adds, is the simultaneous acquisition of images at two different energy levelsone high and one low. Multispectral imaging via computed tomography arxiv. I am interested in obtaining a spectral ct dataset to test a reconstruction algorithm. Comparison of five onestep reconstruction algorithms for spectral ct.
In particular, material decomposition and reconstruction algorithms have the potential to exploit the nature of spectral ct data. Iterative spectral ct reconstruction based on low rank and average. Spectral photoncounting computed tomography for coronary st. Mar 07, 2015 we explore the use of the recently proposed total nuclear variation tv n as a regularizer for reconstructing multichannel, spectral ct images. Software supporting joint image reconstruction method with correlative multi channel prior for xray spectral computed tomography publication in inverse. Cardiac computed tomography ct systems use a series of xray images to create an image volume dataset that can be sliced or manipulated on any plane using advanced visualization software.
This code can be used as part of a platform for molecular imaging with oct, which we call mozart. With experience, the image processing takes about 5 minutes. This software was developed at the university of michigan by jeff fessler and his group. Fda clears siemens spectral ct imaging software for use with. For spectral ct reconstruction, a number of studies were reported.
The iqon spectral ct is a computed tomography xray system intended to produce crosssectional images of the body by computer reconstruction of xray transmission data taken at different angles and planes. Ct reconstruction package file exchange matlab central. Dual energy ct, also known as spectral ct, is a computed tomography technique that uses two separate xray photon energy spectra, allowing the interrogation of materials that have different attenuation properties at different energies. Block matching frame based material reconstruction for. Spectral ct with metal artifacts reduction software for improvement. Spectral ct reconstruction with image sparsity and spectral mean. Which should be the routine crosssectional reconstruction. However, the image quality is degraded because the number of photons in each energy bin is less than the number of photons in the full spectrum. Software for reconstruction of cwepri experiments using fbp and the iterative sirt algorithm has been. In addition, the reconstruction of crosssectional images remains a routine procedure for spectral ct imaging of the abdomen. In multispectral ct mct, the appropriate consideration of the spectral responses leads to a nonlinear data model, and image reconstruction by solving the nonlinear data model remains a topic.
Copenhagen computed tomography toolbox is a collection of applications and libraries for flexible and efficient ct reconstruction. Spectral results spectral results include ct images reconstructed utilizing underlying spectral data which includes the. Postdoc in deep learning based reconstruction for spectralct. In this work, we propose an iterative, hybrid reconstruction technique which. The evolution of image reconstruction for ctfrom filtered back. This platform is a scalable software providing both basic image reconstruction features for standard users and advanced tools for specialists in the reconstruction field, to develop, incorporate and assess their own methods in image reconstruction such as. Software supporting joint image reconstruction method with correlative multichannel prior for xray spectral computed tomography publication in inverse. We further discuss the impact of reconstruction artefacts and segmentation controls on the achievable results. Fessler, fellow, ieee abstract spectral ct provides information on material characterization and quanti. Spectral imaging brings new light to ct imaging technology news.
1180 827 767 447 733 406 647 808 140 590 627 1465 62 1262 462 1349 197 240 1062 130 519 865 303 1010 1143 1024 306 908 587 348 993 737 793 1501 1133 504 1442 468 1375 159 627 1452 312 658 887 159