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Deformable Image Registration

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https://www.readbyqxmd.com/read/28816295/-three-dimensional-data-fusion-method-for-tooth-crown-and-root-based-on-curvature-continuity-algorithm
#1
Y J Zhao, Y Liu, Y C Sun, Y Wang
OBJECTIVE: To explore a three-dimensional (3D) data fusion and integration method of optical scanning tooth crowns and cone beam CT (CBCT) reconstructing tooth roots for their natural transition in the 3D profile. METHODS: One mild dental crowding case was chosen from orthodontics clinics with full denture. The CBCT data were acquired to reconstruct the dental model with tooth roots by Mimics 17.0 medical imaging software, and the optical impression was taken to obtain the dentition model with high precision physiological contour of crowns by Smart Optics dental scanner...
August 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28816151/quantification-of-pediatric-abdominal-organ-motion-with-a-4-dimensional-magnetic-resonance-imaging-method
#2
Jinsoo Uh, Matthew J Krasin, Yimei Li, Xingyu Li, Christopher Tinkle, John T Lucas, Thomas E Merchant, Chiaho Hua
PURPOSE: To characterize respiration-induced abdominal organ motion in children receiving radiation treatment with a 4-dimensional (4D) magnetic resonance imaging (MRI) method. METHODS AND MATERIALS: We analyzed free-breathing coronal 4D MRI datasets acquired from 35 patients (aged 1-20 years) with abdominal tumors. A deformable image registration of the 4D MRI datasets was performed to derive motion trajectories of selected anatomic landmarks, from which organ motions were quantified...
September 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28806994/patterns-of-locoregional-failure-following-post-operative-intensity-modulated-radiotherapy-to-oral-cavity-cancer-quantitative-spatial-and-dosimetric-analysis-using-a-deformable-image-registration-workflow
#3
Abdallah S R Mohamed, Andrew J Wong, Clifton D Fuller, Mona Kamal, Gary B Gunn, Jack Phan, William H Morrison, Beth M Beadle, Heath Skinner, Stephen Y Lai, Sean R Quinlan-Davidson, Abdelaziz M Belal, Ahmed G El-Gowily, Steven J Frank, David I Rosenthal, Adam S Garden
BACKGROUND: We sought to identify spatial/dosimetric patterns of failure for oral cavity cancer patients receiving post-operative IMRT (PO-IMRT). METHODS: Two hundred eighty-nine OCC patients receiving PO-IMRT were retrospectively reviewed from 2000 to 2012. Diagnostic CT documenting recurrence (rCT) was co-registered with planning CT (pCT) using a validated deformable image registration software. Manually segmented recurrent gross disease (rGTV) was deformed to co-registered pCTs...
August 15, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28802976/prognostic-factors-associated-with-the-accuracy-of-deformable-image-registration-in-lung-cancer-patients-treated-with-stereotactic-body-radiotherapy
#4
Yasuharu Sugawara, Hidenobu Tachibana, Noriyuki Kadoya, Nozomi Kitamura, Amit Sawant, Keiichi Jingu
We evaluated the accuracy of an in-house program in lung stereotactic body radiation therapy (SBRT) cancer patients, and explored the prognostic factors associated with the accuracy of deformable image registrations (DIRs). The accuracy of the 3 programs which implement the free-form deformation and the B-spline algorithm was compared regarding the structures on 4-dimensional computed tomography (4DCT) image datasets between the peak-inhale and peak-exhale phases. The dice similarity coefficient (DSC) and normalized DSC (NDSC) were measured for the gross tumor volumes from 19 lung SBRT patients...
August 9, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28800299/representing-the-dosimetric-impact-of-deformable-image-registration-errors
#5
Jason Vickress, Jerry Battista, Rob Barnett, Slav Yartsev
Deformable image registration (DIR) is emerging as a tool in radiation therapy for calculating the cumulative dose distribution across multiple fractions of treatment. Unfortunately, due to the variable nature of DIR algorithms and dependence of performance on image quality, registration errors can result in dose accumulation errors. In this study, landmarked images were used to characterize the DIR error throughout an image space and determine its impact on dosimetric analysis. Ten thoracic 4DCT images with 300 landmarks per image study matching the end-inspiration and end-expiration phases were obtained from 'dir-labs'...
August 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28791659/three-dimensional-analysis-of-the-tibial-resection-plane-relative-to-the-arthritic-tibial-plateau-in-total-knee-arthroplasty
#6
J Michael Johnson, Mohamed R Mahfouz, Mehmet Rüştü Midillioğlu, Alexander J Nedopil, Stephen M Howell
BACKGROUND: Kinematically aligned total knee arthroplasty strives to correct the arthritic deformity by restoring the native tibial joint line. However, the precision of such surgical correction needs to be quantified in order to reduce recuts of the resection and to design assisting instrumentation. This study describes a method for novel three-dimensional analysis of tibial resection parameters in total knee arthroplasty. Pre-operative versus post-operative differences in the slopes of the varus-valgus and flexion-extension planes and the proximal-distal level between the tibia resection and the arthritic tibial joint line can reliably be measured using the three-dimensional models of the tibia and fibula...
August 8, 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/28789598/development-of-a-computerized-4-d-mri-phantom-for-liver-motion-study
#7
Chunhao Wang, Fang-Fang Yin, W P Segars, Zheng Chang, Lei Ren
PURPOSE: To develop a 4-dimensional computerized magnetic resonance imaging phantom with image textures extracted from real patient scans for liver motion studies. METHODS: The proposed phantom was developed based on the current version of 4-dimensional extended cardiac-torso computerized phantom and a clinical magnetic resonance scan. Initially, the extended cardiac-torso phantom was voxelized in abdominal-chest region at the end of exhalation phase. Structures/tissues were classified into 4 categories: (1) Seven key textured organs, including liver, gallbladder, spleen, stomach, heart, kidneys, and pancreas, were mapped from a clinical T1-weighted liver magnetic resonance scan using deformable registration...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28783715/fully-automatic-left-ventricular-myocardial-strain-estimation-in-2d-short-axis-tagged-magnetic-resonance-imaging
#8
Pedro Morais, Sandro Queirós, Brecht Heyde, Jan Engvall, Jan D 'hooge, João L Vilaça
Cardiovascular diseases are among the leading causes of death and frequently result in local myocardial dysfunction. Among the numerous imaging modalities available to detect these dysfunctional regions, cardiac deformation imaging through tagged magnetic resonance imaging (t-MRI) has been an attractive approach. Nevertheless, fully automatic analysis of these data sets is still challenging. In this work, we present a fully automatic framework to estimate left ventricular myocardial deformation from t-MRI. This strategy performs automatic myocardial segmentation based on B-spline explicit active surfaces, which are initialized using an annular model...
August 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28783625/non-rigid-contour-based-registration-of-cell-nuclei-in-2d-live-cell-microscopy-images-using-a-dynamic-elasticity-model
#9
Dmitry V Sorokin, Igor Peterlik, Marco Tektonidis, Karl Rohr, Pavel Matula
The analysis of the pure motion of subnuclear structures without influence of the cell nucleus motion and deformation is essential in live cell imaging. In this work, we propose a 2D contour-based image registration approach for compensation of nucleus motion and deformation in fluorescence microscopy time-lapse sequences. The proposed approach extends our previous approach which uses a static elasticity model to register cell images. Compared to that scheme, the new approach employs a dynamic elasticity model for forward simulation of nucleus motion and deformation based on the motion of its contours...
July 31, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28782629/normcorre-an-online-algorithm-for-piecewise-rigid-motion-correction-of-calcium-imaging-data
#10
Eftychios A Pnevmatikakis, Andrea Giovannucci
BACKGROUND: Motion correction is a challenging pre-processing problem that arises early in the analysis pipeline of calcium imaging data sequences. The motion artifacts in two-photon microscopy recordings can be non-rigid, arising from the finite time of raster scanning and non-uniform deformations of the brain medium. NEW METHOD: We introduce an algorithm for fast Non-Rigid Motion Correction (NoRMCorre) based on template matching. NoRMCorre operates by splitting the field of view (FOV) into overlapping spatial patches along all directions...
August 3, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28781156/evaluation-of-deformed-image-based-dose-calculations-for-adaptive-radiotherapy-of-nasopharyngeal-carcinoma
#11
Miranda Poon, Catherine Holborn, Ka Fai Cheng, Winky Wing Ki Fung, George Chiu
The ultimate goal of adaptive radiotherapy (ART) is to deliver truly customized radiation treatments. Currently, the quality of cone-beam computed tomography (CBCT) images is still inferior to that of conventional CT images in contour delineations and dose calculations for replanning purposes. This retrospective study aims to evaluate the dosimetric accuracy of using deformed conventional CT images for dose calculations, in the hope of inferring the feasibility of ART using planning CT (PCT) images that deformed to up-to-date CBCT images for patients with nasopharyngeal carcinoma (NPC)...
August 3, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28761337/size-variation-and-collapse-of-emphysema-holes-at-inspiration-and-expiration-ct-scan-evaluation-with-modified-length-scale-method-and-image-co-registration
#12
Sang Young Oh, Minho Lee, Joon Beom Seo, Namkug Kim, Sang Min Lee, Jae Seung Lee, Yeon Mok Oh
A novel approach of size-based emphysema clustering has been developed, and the size variation and collapse of holes in emphysema clusters are evaluated at inspiratory and expiratory computed tomography (CT). Thirty patients were visually evaluated for the size-based emphysema clustering technique and a total of 72 patients were evaluated for analyzing collapse of the emphysema hole in this study. A new approach for the size differentiation of emphysema holes was developed using the length scale, Gaussian low-pass filtering, and iteration approach...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28755425/accuracy-of-eight-deformable-image-registration-dir-methods-for-tomotherapy-megavoltage-computed-tomography-mvct-images
#13
Wannapha Nobnop, Hudsaleark Neamin, Imjai Chitapanarux, Somsak Wanwilairat, Vicharn Lorvidhaya, Taweap Sanghangthum
INTRODUCTION: The application of deformable image registration (DIR) to megavoltage computed tomography (MVCT) images benefits adaptive radiotherapy. This study aims to quantify the accuracy of DIR for MVCT images when using different deformation methods assessed in a cubic phantom and nasopharyngeal carcinoma (NPC) patients. METHODS: In the control studies, the DIR accuracy in air-tissue and tissue-tissue interface areas was observed using twelve shapes of acrylic and tissue-equivalent material inserted in the phantom...
July 29, 2017: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/28753797/-18-f-dcfpyl-positron-emission-tomography-magnetic-resonance-imaging-for-localization-of-dominant-intraprostatic-foci-first-experience
#14
Glenn Bauman, Peter Martin, Jonathan D Thiessen, Reggie Taylor, Madeleine Moussa, Mena Gaed, Irina Rachinsky, Zahra Kassam, Joseph Chin, Stephen Pautler, Ting Yim Lee, John F Valliant, Aaron Ward
An ongoing prospective study is acquiring preoperative imaging data for men with prostate cancer (PCa) using the molecular imaging agent [(18)F]-DCFPyL targeted against prostate-specific membrane antigen (PSMA). To date, six men (of a planned accrual of 24) with clinically localized, biopsy-proven PCa have undergone preoperative [(18)F]-DCFPyL positron emission tomography (PET) imaging and multiparametric magnetic resonance imaging acquired using a hybrid PET/MRI system. Lesions identified by [(18)F]-DCFPyL uptake on PET/MRI were characterized in terms of maximum standardized uptake value (SUVmax) and volume using a boundary threshold of 40% SUVmax...
October 26, 2016: European Urology Focus
https://www.readbyqxmd.com/read/28745402/fat-based-registration-of-breast-dynamic-contrast-enhanced-water-images
#15
Subashini Srinivasan, Brian A Hargreaves, Bruce L Daniel
PURPOSE: In this study, a 3D fat-based deformable registration algorithm was developed for registering dynamic contrast-enhanced breast images. METHODS: The mutual information similarity measure with free-form deformation motion correction in rapidly enhancing lesions can introduce motion. However, in Dixon-based fat-water separated acquisitions, the nonenhancing fat signal can directly be used to estimate deformable motion, which can be later used to deform the water images...
July 26, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28742029/collocation-for-diffeomorphic-deformations-in-medical-image-registration
#16
Sune Darkner, Akshay Pai, Matthew G Liptrot, Jon Sporring
Diffeomorphic deformation is a popular choice in medical image registration. A fundamental property of diffeomorphisms is in vertibility, implying that once the relation between two points A to B is found, then the relation B to A is given per definition. Consistency is a measure of a numerical algorithm's ability to mimic this invertibility, and achieving consistency has proven to be a challenge for many state-of-the-art algorithms.
July 21, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28740907/functional-imaging-equivalence-and-proof-of-concept-for-image-guided-adaptive-radiotherapy-with-fixed-gantry-and-rotating-couch
#17
Ilana Feain, Chun-Chien Shieh, Paul White, Ricky O'Brien, Sandra Fisher, William Counter, Peter Lazarakis, David Stewart, Simon Downes, Michael Jackson, Siddhartha Baxi, Brendan Whelan, Kuldeep Makhija, Chen-Yu Huang, Michael Barton, Paul Keall
PURPOSE: The purpose of this article is to present the first imaging experiments to demonstrate the functional equivalence between a conventional rotational gantry and a fixed-beam imaging geometry, and the feasibility of an iterative image-reconstruction technique under gravitational deformation. METHODS AND MATERIALS: Experiments were performed using an Elekta Axesse with Agility MLC and XVI, a custom-built rotating phantom stage, a Catphan QA phantom, and a porcine heart...
October 2016: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28735836/importance-of-deformable-image-registration-and-biological-dose-summation-in-planning-of-radiotherapy-retreatments
#18
Eeva Boman, Mika Kapanen, Lyndsey Pickup, Sirpa-Liisa Lahtela
The purpose of this study is to evaluate the effect of nonrigid and fractionation-corrected dose summation on total doses in radiotherapy and to demonstrate the benefits of such dose summation on clinical decision-making for planning of retreatments. Dose summation of organs at risk (OARs) was investigated for 3 clinical cases with need of retreatment to the same site: head and neck, brain, and mediastinum. Three different summation methods over old and new radiotherapy treatment plans are presented and compared: (1) rigid raw sum with rigid registration of the planning images and direct dose summing; (2) deformable raw sum with deformable image registration and direct dose summing; and (3) deformable biological sum with deformable registration and takes into account the dose per fraction in biological manner in certain critical organs...
July 20, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28716583/quantitative-analysis-of-geometry-and-lateral-symmetry-of-proximal-middle-cerebral-artery
#19
Roman Peter, Bart J Emmer, Adriaan C G M van Es, Theo van Walsum
BACKGROUND: The purpose of our work is to quantitatively assess clinically relevant geometric properties of proximal middle cerebral arteries (pMCA), to investigate the degree of their lateral symmetry, and to evaluate whether the pMCA can be modeled by using state-of-the-art deformable image registration of the ipsi- and contralateral hemispheres. METHODS: Individual pMCA segments were identified, quantified, and statistically evaluated on a set of 55 publicly available magnetic resonance angiography time-of-flight images...
July 14, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28714458/a-graphical-approach-to-optimizing-variable-kernel-smoothing-parameters-for-improved-deformable-registration-of-ct-and-cone-beam-ct-images
#20
Vern Hart, Damon Burrow, X Allen Li
A systematic method is presented for determining optimal parameters in variable-kernel deformable image registration of cone beam CT and CT images, in order to improve accuracy and convergence for potential use in online adaptive radiotherapy. Assessed conditions included the noise constant (symmetric force demons), the kernel reduction rate, the kernel reduction percentage, and the kernel adjustment criteria. Four such parameters were tested in conjunction with reductions of 5, 10, 15, 20, 30, and 40%. Noise constants ranged from 1...
July 17, 2017: Physics in Medicine and Biology
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