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Topic: Tomographic reconstruction

Related Topics

Reconstruction algorithm

Filtered back projection

Computerized axial tomography

Tomogram

Iterative reconstruction

SPECT

Cardiology diagnostic tests and procedures

Hounsfield scale

Medical imaging

Computed axial tomography

Electron beam tomography

Radiodensity

Brain imaging

Positron emission tomography

Nuclear medicine

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	Tomographic reconstruction - Wikipedia, the free encyclopedia
		The mathematical basis for tomographic imaging was laid down by Johann Radon.
		This article applies in general to tomographic reconstruction for all kinds of tomography, but some of the terms and physical descriptions refer directly to X-ray computed tomography.
		This function is known as the Radon transform (or sinogram) of the 2D object.
	en.wikipedia.org /wiki/Tomographic_reconstruction (424 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		Field of Invention The present invention generally relates to an apparatus and method for reconstructing images in computed tomographic fluoroscopy, and particularly to an iterative process for performing this functionality in real-time applications utilizing a row-action or modified ordered-subset expectation maximization algorithm or other ordered-subset based algorithms in fan-beam or cone-beam geometry.
		The process proceeds with step 350 where the discrepancies are backprojected over the image reconstruction grid to produce a backprojected image, and the backprojected image is then pixel-wise divided by the relaxation factor, which is then multiplied by the current image pixel-wise to update the current image.
		Reconstruction was performed using 180 projections, 190 detectors per projection and half-scan data.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/21036.000413&ELEMENT_SET=DECL (4522 words)

	Digital Tomosynthesis
		Digital Tomosynthesis (DTS) is referred to as the limited angle technique, which allows the reconstruction of tomographic planes on the basis of the information contained within the images acquired during one tomographic acquisition step.
		The interaction with simultaneous reference to projection and tomographic data allows the user to verify his perception of spatial relationships and ensures a high degree of localization accuracy of 1.2 mm and a precision of 0.4 mm.
		The effect of the reconstruction arc on the spatial resolution, slice thickness, contrast sensitivity, shape distortion and artifacts, was also experimentally studied.
	bme.med.upatras.gr /bit/tomosynthesis.htm (1240 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		This acquisition data consists of tomographic projections or is processed to obtain tomographic projections, which may be used in a tomographic reconstruction procedure to obtain image data associated with a sectional view of the observed object.
		However, since the tomographic projections Y are often processed to incorporate various corrections, such as attenuation correction, scatter correction, resolution correction and geometric correction, the resulting noise W does not actually comply with such statistical models.
		data corresponding to tomographic projections of a series of cross-sectional slices of the observed object are provided and the projections are backprojected for each cross- sectional slice, generating data corresponding to a series of noisy cross-sectional slices of the observed object.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/84500.011108&ELEMENT_SET=DECL (6173 words)

	CAT Application Note
		Computed axial tomographic reconstruction using back-projection is presented as a challenging real-world application illustrating the performance obtainable with Alacron's FastSeries architecture compared to standard cluster architectures.
		The reconstruction region is a square array of 1024 x 1024 pixels centered on the axis of rotation of the x-ray head (Figure 1).
		Conversion of the fan shaped polar form of the data to the square array of pixels in the reconstruction region is accomplished by summing the density along each ray into each pixel the ray encounters.
	www.alacron.com /software/CAT-SCAN.htm (1047 words)

	JAWMA Paper: Tomographic Reconstruction of Tracer Gas Concentration Profiles in a Room with the Use of a Single OP-FTIR ... (Site not responding. Last check: 2007-11-04)
		Tomographic Reconstruction of Tracer Gas Concentration Profiles in a Room with the Use of a Single OP-FTIR and Two Iterative Algorithms: ART and PWLS
		Computed tomographic (CT) reconstructions of air con-taminant concentration fields were conducted in a room-sized chamber employing a single open-path Fourier transform infrared (OP-FTIR) instrument and a combina-tion of 52 flat mirrors and 4 retroreflectors.
		However, the peak heights were slightly reduced in the PWLS-CT reconstructions due to the nature of the PWLS algorithm.
	www.awma.org /journal/ShowAbstract.asp?Year=2000&PaperID=79 (447 words)

	Tomography
		Probably the most important contribution of this algorithm is that the Bayesian MAP reconstruction optimization is not performed over the wavelet coefficients, but instead over pixels in the space domain using scale-recursive updates of the wavelet prior.
		This is extremely important, since without enforcing positivity, the quality of tomographic reconstructions is typically unacceptable even in high signal-to-noise ratio cases.
		The scanner has a non-standard, intricate geometry, resulting in projection data that is not very suitable for direct tomographic reconstruction techniques such as convolution backprojection.
	dynamo.ecn.purdue.edu /~bouman/tomography (813 words)

	Available Technologies - Office of Technology Management (Site not responding. Last check: 2007-11-04)
		This suite of patented and patent-pending algorithms reconstructs tomographic images for standard (i.e., 2-D) and volumetric (i.e., 3-D) CT scans 10 to 100 times faster than conventional methods for typical image sizes, lowering scanning costs, increasing throughput, enabling improved image quality, and freeing up precious computer resources.
		Dramatically faster 3-D imaging: The reconstruction of cone-beam data gathered for 3-D or volumetric imaging is extremely demanding computationally, in particular for spiral cone-beam or cardiac cine; therefore, the algorithms offer a critical improvement in reconstruction speed.
		This family of native divergent beam algorithms can be used to reconstruct all divergent-beam tomographic data, including single- and multi-slice 2-D fan-beam and 3-D cone-beam with arbitrary scan trajectories, including single circle and spiral trajectories for short and long objects.
	www.otm.uiuc.edu /techs/techdetail.asp?id=19 (1069 words)

	Three-Dimensional Solar Wind Modeling Using Remote-Sensing Data (Site not responding. Last check: 2007-11-04)
		The reconstruction takes into account that line of sight observations are dominated by contributions from material closest to the Sun, but no explicit assumptions are made about the distribution of velocity and density along the lines of sight.
		Corotating tomographic reconstructions using IPS and Helios data are usually performed with angular resolution of 10º in heliographic coordinates and 0.1 AU in heliocentric distance.
		An important use for heliospheric tomographic reconstructions lies in its application to space weather studies: remote sensing observations towards the east of the Sun sample corotating structures that have not yet reached Earth.
	cassfos02.ucsd.edu /solar/publications/2001_eslab34/e34-039.html (1332 words)

	Reconstruction Techniques for Positron Emission Tomography
		Bayesian reconstruction methods allow the incorporation of prior information (such as smoothness constraints or partial specified topological information) and therefore further reduce the noise sensitivity.
		In contrast with conventional reconstruction techniques, our method can be adapted in a quite natural way to handle incomplete data (measurements missing for certain angles due to detector failure or simply due to occlusion-a severe problem in X-Ray CT).
		We are investigating convergence issues in terms of several process parameters, and the feasibility of simulated annealing in the context of image reconstruction from projections.
	www.elis.rug.ac.be /brochure/node53.html (415 words)

	Interpolation CT slices
		The most important part of 3D visualization of tomographic data is an object model reconstruction.
		The traditional reconstruction techniques include some artefacts since the distances between slices are too big.
		We transform the reconstruction problem of 3D object to the 1D object reconstruction.
	www.cg.tuwien.ac.at /studentwork/CESCG/CESCG98/MZimanyi (764 words)

	Stephen Glick - Faculty - Radiology - UMass Medical School (Site not responding. Last check: 2007-11-04)
		To evaluate improvements in tomographic mammography, if any, we plan to compare lesion detection accuracy using human observer studies and simulated images generated with planar mammography, tomosynthesis, and CT mammography.
		The goal of the proposed research is to investigate the use of statistically based iterative reconstruction (IR) methods for breast tomosynthesis.
		I, D'Orsi CJ, and Webber RL, "Iterative reconstruction for limited angle tomographic digital mammography," presented at the 84th Annual Meeting of the Radiological Society of North America, Nov., 1998..
	www.umassmed.edu /entities/med_phys/people/Glick.cfm?start=0& (4068 words)

	Stephen Glick, Ph.D. - Faculty - Radiology - UMass Medical School
		Tomographic imaging can provide the radiologist with image slices through the three-dimensional (3D) breast, possibly reducing this masking effect.
		Limited angle, tomographic mammography, also referred to as breast tomosynthesis, is a technique that has been proposed to reduce this masking effect, by providing the radiologist with tomographic image slices through the breast.
		[30] Glick SJ and Soares EJ, "Noise characteristics of SPECT iterative reconstruction with a mis-matched projector-backprojector pair," IEEE Trans Nuc Sci, 45:2183-2188, 1998.
	www.umassmed.edu /biomedeng/faculty/glick.cfm?start=0& (4069 words)

	Ionospheric tomography: Issues, sensitivities, and uniqueness
		The tomographic reconstructions are dependent on geometries, algorithms, accuracies, noise, bias, and multipath, among other things.
		Relative roles of different factors are not clearly understood, and the “objectivity” of tomographic reconstruction is generally uncertain.
		On the basis of these simulations we provide guidelines for objective reconstruction of the ionosphere using ground-based and satellite-based receivers.
	www.agu.org /pubs/crossref/2001/1999RS002414.shtml (163 words)

	Time-Dependent Tomographic Reconstruction Using Helios Photometer Data (Site not responding. Last check: 2007-11-04)
		This "time-dependent" tomographic modeling technique maps day to day changes in the solar wind density content in three dimensions over the heliosphere.
		The video sequence presents each day's tomographic model result with a cadence of one-quarter day between frames over the time interval.
		The tomographic model fit to brightness has a far more simple relationship with density than does IPS g-level with density (see "Time-Dependent" Cambridge/STELab Tomography) accessed in current Space Weather Forecasts.
	cassfos02.ucsd.edu /solar/tomography/fast_helios_1653.html (481 words)

	Tomographic Reconstruction of Ultrasonic Attenuation with Correction for Refractive Errors
		Computerized ultrasonic attenuation tomography is one area where medically significant images may be reconstructed for diagnostic purposes.
		The important aspect of this new scanning mode lies in its correction for refraction in the measured attenuation profiles.
		In reconstructing phantom targets scanned by our experimental system, results superior to traditional line-of-sight scanning were obtained.
	domino.research.ibm.com /tchjr/journalindex.nsf/f556e7f920289a74852565450065410b/67f7e6943115e14385256bfa0067f4a9?OpenDocument (139 words)

	JAWMA Paper: Evaluation of Virtual Source Beam Configurations for Rapid Tomographic Reconstruction of Gas and Vapor ... (Site not responding. Last check: 2007-11-04)
		However, a practical limitation arises because in the past, multiple-source and detector units were required to produce a sufficient number of intersecting beam paths in order to reconstruct concentration maps.
		The performance of the tomographic reconstruction strategy was tested as a func-tion of concentration and concentration gradients.
		Computed tomographic techniques coupled with remote sensing have been applied to air monitoring.
	www.awma.org /Journal/ShowAbstract.asp?Year=1997&PaperID=372 (415 words)

	Quantifoil Holey Carbon Films for TEM - Cryo-electron tomographic reconstruction - SPI Supplies (Site not responding. Last check: 2007-11-04)
		An electron micrograph of a zero-degree projection of a tilt series; the edge of the hole in the Quantifoil is seen at the bottom.
		A view of the reconstruction, showing that the crista membrane that forms a three-dimensional network of interconnected lamellae is continuous with the inner boundary membrane (both shown in yellow).
		The outer membrane (magenta) is separated from the inner one by a narrow width of remarkably constant width.
	www.2spi.com /catalog/grids/quantifoil-carbon-films-cryo-electron.html (136 words)

	Klaus Mueller's homepage
		So far we have achieved speedups of 1-2 orders of magnitude (a factor of 10-100), without significant losses in reconstruction quality (see here for more information).
		Our approach enables rapid 3D reconstruction in diagnostic imaging, radio-therapy applications, surgery planning, electron microscopy, and others, at a fraction of the cost of proprietary hardware.
		Related projects are the 3D reconstruction from transmission ultrasound, MV-CT and proton-CT data, projections obtained via mobile X-ray source/detector pairs, and functional imaging applications, including MRI, functional MRI, SPECT, and PET.
	www.cs.sunysb.edu /~mueller/research/ct.html (394 words)

	Microstructure Characterization in Composite Media Using Ultrasonic Tomography by Ronald A (Site not responding. Last check: 2007-11-04)
		Recently, we have presented a possible approach to treating this problem for composite materials where the anisotropy could be effectively modeled using composite micromechanics equations.
		Experimentally, we have successfully obtained tomographic images from unidirectionally reinforced composite media with a differential cure state where the stiffness of the matrix (Young's modulus) was the tomographic variable of interest.
		Analytically, we have extended our analysis to permit multiparameter image reconstruction using data from all three possible modes of propagation, not just the quasilongitudinal mode as in the original problem.
	www.cnde.iastate.edu /QNDEDatabase/Vol.11A/p0797-0803.html (324 words)

	Residual Stress Analysis using Multiparameter Tomographic Reconstruction by J (Site not responding. Last check: 2007-11-04)
		---Typically, when acoustic tomognphy is utilized, one seeks to reconstruct the values of a single material parameter (e.g.
		Stewart, "An Algebraic Reconstruction Technique for Weakly Anisotropic Velocity" Geophysics, 53 (1988) pp.
		Wang, R. Kline, R. Mignogna and P. Delsanto, "A New Technique for Multi- parameter Image Reconstruction Using a Tomographic Approach," Review of Progress in QNDE, B(1994).
	www.cnde.iastate.edu /qndedatabase/Vol.14B/p2223-2230.html (187 words)

	Keith Price Bibliography Tomographic Image Generation, Reconstruction (Site not responding. Last check: 2007-11-04)
		Sedarat, H. Nishimura, D.G. On the optimality of the gridding reconstruction algorithm,
		A genetic approach to limited data tomographic reconstruction of time-resolved energy spectrum of short-pulsed neutron sources,
		Bayesian Reconstruction for Transmission Tomography with Scale Hyperparameter Estimation,
	iris.usc.edu /Vision-Notes/bibliography/medical861.html (1921 words)

	Leonid Tsap: Recovery and Visualization of 3D Structure of Chromosomes from Tomographic Reconstruction Images (Site not responding. Last check: 2007-11-04)
		Leonid Tsap: Recovery and Visualization of 3D Structure of Chromosomes from Tomographic Reconstruction Images
		The objectives of this work include automatic recovery and visualization of a 3D chromosome structure from a sequence of 2D tomographic reconstruction images taken through the nucleus of a cell.
		Structure is very important for biologists since it affects chromosome functions, behavior and the state of the cell.
	marathon.csee.usf.edu /~tsap/project7.html (199 words)

	The Wavelet Digest :: View topic - Question: wavelets and tomographic reconstruction
		The Wavelet Digest :: View topic - Question: wavelets and tomographic reconstruction
		I'm doing some research concerning the use of wavelets in tomography,
		This page was created in 0.195494 seconds : 19 queries executed : GZIP compression disabled
	www.wavelet.org /phpBB2/viewtopic.php?t=2725&view=previous (136 words)

	SourceForge.net: SW for Tomographic Image Reconstruction
		STIR (Software for Tomographic Imaging Reconstruction) is Open Source software for use in tomographic imaging.
		Its aim is to provide a Platform-independent Object-Oriented framework for all data manipulations in tomographic imaging (currently only PET)
		Operating System: OS Independent (Written in an interpreted language)
	sourceforge.net /projects/stir (131 words)

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