fast accurate unsupervised segmentation of 3d magnetic resonance angiography

... choice of Chinese as the language in our work is essential If the assumption holds well, the most important and direct application is unsupervised text segmentation into words Many works in unsupervised ... see that unsupervised segmentation is more di cult, by far, than supervised segmentation; therefore, the algorithms are complex, and previous studies have tended to be limited in terms of both ... test corpus consisting of 1001 KB manually segmented data with the training corpus consisting of 200 MB of Chinese text Chinese is such an important language that supervised segmentation methods...

Ngày tải lên: 20/02/2014, 12:20

... numerator of the multinomial is the factorial of the total number of morph tokens, N , which equals the sum of frequencies of every morph type The denominator is the product of the factorial of the ... the segmentation of a set of words consists of the following steps: (1) Segment the words in the corpus using the automatic segmentation algorithm (2) Divide the segmented data into two parts of ... segmentation of words In this paper, we aim at overcoming the problem of excessive segmentation, particularly when small corpora (up to 200 000 words) are used for training We present a new segmentation...

Ngày tải lên: 31/03/2014, 03:20

... tumor progression in mouse models List of abbreviations MRI: magnetic resonance imaging; BT-MRI: benchtop -magnetic resonance imaging; NMR: nuclear magnetic resonance; Gd-BOPTA: gadobenate dimeglumine; ... BT-MRI and measurement of pixel extensions of tumor sections based on NMR images For both methods comparable progression profiles could be observed, which was independent of GdBOPTA injection A ... al Journal of Experimental & Clinical Cancer Research 2011, 30:69 http://www.jeccr.com/content/30/1/69 Page of Figure Monitoring of xenograft tumor growth (A): Transaxial NMR images of a mouse...

Ngày tải lên: 10/08/2014, 10:21

... gradient value, the faster the propagation of the surface is, which results in a robust and accurate segmentation [51] In the context of MRA segmentation, the accuracy of the segmentation process ... instead of the 3D view of the vasculature itself • A variety of artifacts may appear in MR images: Since the artifacts change the appearance of the image, they may also affect the performance of a segmentation ... i.e., to which of the tissues should it be assigned One way of dealing with partial volume effects is by using so called soft segmentation Soft segmentation, as opposed to hard segmentation, means...

Ngày tải lên: 02/10/2015, 12:55

... for thrombi Magnetic resonance angiography of heart and coronary arteries Magnetic Resonance Angiography is the most attractive of angiography procedures for Coronary arteries because of its widespread ... Magnetic resonance angiography of vascular run-off Contrast-Enhanced Magnetic Resonance Angiography is rapidly gaining acceptance as the method of choice for diagnostic imaging of the run-off vessels ... contrastenhanced magnetic resonance angiography in the investigation of suspected intracranial dural arteriovenous fistula ” Journal of clinical neuroscience : official journal of the Neurosurgical Society of...

Ngày tải lên: 07/03/2014, 23:20

... China 2Department of Radiology, The First Bethune Hospital of Jilin University, 71 Xinmin Avenue, Changchun 130021, China 3Department of Pathology, The First Bethune Hospital of Jilin University, ... surgical removal of pineal region meningioma is also affected by the VC of the pineal region [17,18] Pineal region meningioma commonly results in a shift of the surrounding structures of the quadrigeminal ... retrospective analysis of CTA images of these pineal region meningiomas, combined Li et al World Journal of Surgical Oncology 2011, 9:64 http://www.wjso.com/content/9/1/64 Page of Table Clinical histories...

Ngày tải lên: 09/08/2014, 02:20

... SEGMENTATION OF HUMAN MUSCLES OF MASTICATION FROM MAGNETIC RESONANCE IMAGES NG HSIAO PIAU (B Eng (Hons.), National University of Singapore) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... segmentations of left and right masseters 154 6.5 3D segmentations of left and right lateral pterygoids 155 6.6 3D segmentations of left and right medial pterygoids 156 6.7 Volume rendered images of the ... Sensitivity of model accuracy to number of dominant slices, c 137 5.6.2 Selection of Ii and If 138 5.6.3 Number of polynomial coefficients used in spline fitting 139 5.6.4 Segmentation of muscles...

Ngày tải lên: 12/09/2015, 08:20

... FAST REGISTRATION OF CONTRAST-ENHANCED MAGNETIC RESONANCE IMAGES OF THE BREAST SUN YIN (B.Eng (Hons.), NUS) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF ELECTRICAL ... requires the formation of the joint histogram of corresponding voxel pairs The optimization of the transformation parameters often requires computation of the gradient of the MI- or NMI-based ... The degree of freedom of FFD is proportional to the number of control points In medical applications, the images are 3D and there is a large amount of data to handle A large number of control...

Ngày tải lên: 06/10/2015, 20:49

... SEGMENTATION OF THE COLON IN MAGNETIC RESONANCE IMAGES NICOLAS PAYET (B.Eng., Supélec) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF ELECTRICAL & COMPUTER ... processing of images in MR colonography 1.2 Aim of the Thesis One of the most important steps in the processing of the images is segmentation This step consists of isolating the colon from the rest of ... algorithms Finally we show the possibility of a 3D reconstruction of the colon from 2D images segmented with B-snakes on a series of 40 images vi LIST OF TABLES List of Tables 6.1 Quantitative results...

Ngày tải lên: 16/10/2015, 15:38

... require a large amount of training data 19 2.2 Unsupervised segmentation 2.2 Unsupervised segmentation Gibbs et al [11] presented an unsupervised approach for the segmentation of tumor in T1 post-contrast ... 1.4: Example of pseudo -3D approach [5] Another method for 3D segmentation, which is believed to be more robust and accurate, is to carry out the computation in 3D space and detect the 3D tumor surface ... work The output of this work is the 3D surface of the tumor There are two kinds of methods to obtain the 3D tumor surface One is reconstructing the 3D surface from a sequence of 2D contours detected...

Ngày tải lên: 08/11/2015, 17:33

... to the problem of segmenting parallel parts of documents The task of aligning each sentence of an abstract to one or more sentences of the body has been studied in the context of summarization ... concentration parameter of the underlying DP distribution GEM (α) defines a distribution of partitions of the unit interval into a countable number of parts The formal definition of our model is as ... Proceedings of ACL, pages 305–312 Jacob Eisenstein and Regina Barzilay 2008 Bayesian unsupervised topic segmentation In Proceedings of EMNLP, pages 334–343 Thomas S Ferguson 1973 A Bayesian analysis of...

Ngày tải lên: 20/02/2014, 04:20

... learning of Conditional Random Field (CRF) sequence models to the problem of parsing the head- ers of research papers There has also been some previous work on unsupervised learning of field segmentation ... limited unsupervised segmentation of bibliographic citations as a small part of a larger probabilistic model of identity uncertainty However, their system does not explicitly learn a field segmentation ... range of linguistic phenomena in text, including morphology, parts-ofspeech (POS), named entity mentions, and even topic changes in discourse An HMM consists of a set of states S, a set of observations...

Ngày tải lên: 23/03/2014, 19:20

... domain of the fiber shaft To this end, novel spleen-to-liver metastatic colorectal cancer mouse model was used and the antitumor efficacy was evaluated with magnetic resonance imaging (MRI) Page of ... study 21 days after intrasplenic injection of HCT116 cells, × 10e10 VP of AdTL, AdTLGR, or AdTLRGDK in 150 μl of PBS were injected through the tail vein of NMRI nude mice After 48 hours, mice (n ... injections of × 10e10 VP of WT, WTRGD, or WT-RGDK in 100 μl volume of PBS (n = 4, 11, and 9, respectively) Mock animals (n = 9) were treated with PBS only Tumor volume was followed up by MRI of the...

Ngày tải lên: 18/06/2014, 16:20

... after operation using a scale of 1–9 with ascending order of effort Score was equivalent to nonawareness of breathing effort at rest Score 1–3 was equivalent of awareness of gentle breathing effort ... The protocol of BH-MR imaging of the chest has been reported in previous published study [5] In brief, fast gradient-recalled echo pulse sequence was used to obtain coronal images of the whole ... consisted of three types (a) cases of Harrington rod on concave side, Luque rod on convex side and Wisconsin wire for the instrumented spinous processes (b) cases of ISOLA instrumentation consisted of...

Ngày tải lên: 20/06/2014, 01:20

... theoretical analysis To further understand the origin of ferromagnetism of TMs in the ZnO nanowire, we also plot the density of states (DOS) of 3d levels of the FM and AFM states in Fig for the two Cr ... the defect formation energies of transition metals in ZnO nanowires and bulk, and the magnetic coupling properties of the TMs in the two systems A brief summary of the letter is given in Sect ... Further reference can be found in [31]) The variations of formation energies could be explained by the shift of the single electron energy levels of 3d relative to the conduction band minimum (CBM)...

Ngày tải lên: 22/06/2014, 01:20

... reserved Usage subject to terms and conditions of license 84 132 150 162 164 166 168 Contents VIII Pelvis MRI MRI MRI MRI MRI MRI MRI of of of of of of of the the the the the the the Female Pelvis—Axial ... MRI of the Abdomen—Coronal Renal Artery—MR Angiography MR Angiography of the Coeliac Trunk—MR Angiography MR Angiography of the Splenic ... 37 38 Segments of the lungs Right Lung Apical segment of upper lobe Posterior segment of upper lobe Anterior segment of upper lobe Lateral segment of middle lobe Medial segment of middle lobe...

Ngày tải lên: 29/06/2014, 09:21

... conditions of license 163 164 MR Angiography of the Coeliac Trunk Moeller, Sectional Anatomy © 2007 Thieme All rights reserved Usage subject to terms and conditions of license MR Angiography ... conditions of license 165 166 MR Angiography of the Splenic and Portal Veins Moeller, Sectional Anatomy © 2007 Thieme All rights reserved Usage subject to terms and conditions of license MR Angiography ... conditions of license 152 MRI of the Abdomen 45 46 47 48 49 (Numbers indicate liver segments) Right ventricle Diaphragm Right lung (costodiaphragmatic recess) Falciform ligament of liver Right lobe of...

Ngày tải lên: 29/06/2014, 09:21

... smoothing using a Gaussian kernel of full width at half maximum (FWHM) mm; mean-based intensity normalisation of all volumes by the same factor; high-pass filter cut-off of 100 s; high-pass temporal ... chance of one or more false positive clusters anywhere in the brain Finally, MRI3dx http://imaging.aston.ac.uk/mri3dX/ index.shtml was used to determine the corresponding labels for the areas of ... preliminary findings from a cohort of individuals who are the presumed obligate carriers of genes linked to schizophrenia The performance of this group was compared to that of healthy age/gender/IQ matched...

Ngày tải lên: 08/08/2014, 23:21

... testreset reliability of the KID-SCID In Scientific Proceedings of the 44th Meeting of the American Academy of Child and Adolescent Psychiatry Washington, DC: AACAP; 1997:172-173 Office of Population ... schizophrenia: a meta-analysis of quantitative magnetic resonance imaging studies Schizophr Res 2006, 82:75-88 Page of 11 (page number not for citation purposes) Annals of General Psychiatry 2008, ... side of the figure represents the right side of the brain; the z coordinate for each axial slice in the standard space of Talairach and Tournoux [38] is given in mm Cluster-wise probability of...

Ngày tải lên: 08/08/2014, 23:21