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Image registration

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https://www.readbyqxmd.com/read/29774779/image-guided-radiation-therapy-for-post-operative-gynaecologic-cancer-patient-set-up-verification-with-and-without-implanted-fiducial-markers
#1
Donna H Murrell, Andrew Warner, Quinn Benwell, Wendy Wells, Danielle Scott, Vikram Velker, George Hajdok, David P D'Souza
BACKGROUND: Intensity modulated radiotherapy (IMRT) is increasingly being used to treat gynaecological malignancies in the postoperative setting. The purpose of this study was to evaluate the use of image-guided radiotherapy (IGRT) using cone-beam computed tomography (CBCT) with fiducial markers for daily localization. MATERIAL AND METHODS: A single institution study was performed of consecutive cervical or endometrial cancer patients receiving adjuvant external beam radiotherapy (n = 15)...
May 18, 2018: Acta Oncologica
https://www.readbyqxmd.com/read/29772797/automated-geo-co-registration-of-multi-temporal-very-high-resolution-imagery
#2
Youkyung Han, Jaehong Oh
For time-series analysis using very-high-resolution (VHR) multi-temporal satellite images, both accurate georegistration to the map coordinates and subpixel-level co-registration among the images should be conducted. However, applying well-known matching methods, such as scale-invariant feature transform and speeded up robust features for VHR multi-temporal images, has limitations. First, they cannot be used for matching an optical image to heterogeneous non-optical data for georegistration. Second, they produce a local misalignment induced by differences in acquisition conditions, such as acquisition platform stability, the sensor's off-nadir angle, and relief displacement of the considered scene...
May 17, 2018: Sensors
https://www.readbyqxmd.com/read/29772077/a-feature-alignment-score-for-online-cone-beam-ct-based-image-guided-radiotherapy-for-prostate-cancer
#3
Catriona Hargrave, Timothy Deegan, Michael Poulsen, Tomasz Bednarz, Fiona Harden, Kerrie Mengersen
PURPOSE: To develop a method for scoring online cone-beam CT (CBCT)-to-planning CT image feature alignment to inform prostate image-guided radiotherapy (IGRT) decision-making. The feasibility of incorporating volume variation metric thresholds, predictive of delivering planned dose into weighted functions, was investigated. METHODS: Radiation therapists and radiation oncologists participated in workshops where they reviewed prostate CBCT-IGRT case examples and completed a paper-based survey of image feature matching practices...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29772061/an-image-guided-radiotherapy-decision-support-framework-incorporating-a-bayesian-network-and-visualization-tool
#4
Catriona Hargrave, Timothy Deegan, Tomasz Bednarz, Michael Poulsen, Fiona Harden, Kerrie Mengersen
PURPOSE: To describe a Bayesian network (BN) and complementary visualization tool, that aim to support decision-making during online cone-beam computed tomography (CBCT)-based image guide radiotherapy (IGRT) for prostate cancer patients. METHODS: The BN was created to represent relationships between observed prostate, proximal seminal vesicle (PSV), bladder and rectum volume variations, an image feature alignment score (FASTV _ OAR ), delivered dose and treatment plan compliance (TPC)...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29771683/an-individualized-strategy-to-estimate-the-effect-of-deformable-registration-uncertainty-on-accumulated-dose-in-the-upper-abdomen
#5
Yibing Wang, Steven F Petit, Eliana Vasquez Osorio, Vikas Gupta, Alejandra Méndez Romero, Ben J M Heijmen
In the abdomen, it is challenging to assess the accuracy of deformable image registration (DIR) for individual patients, due to the lack of clear anatomical landmarks, which can hamper clinical applications that require high accuracy DIR, such as adaptive radiotherapy. In this study, we propose and evaluate a methodology for estimating the impact of uncertainties in DIR on calculated accumulated dose in the upper abdomen, in order to aid decision making in adaptive treatment approaches. 
 Sixteen liver metastasis patients treated with SBRT were evaluated...
May 17, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29771042/-alarming-system-in-real-time-and-high-quality-display-using-volumerendering-for-otologic-surgical-navigation-a-preclinical-study
#6
W Y Zhang, G D Feng, S Q Chen, Q W Huang, Z Q Gao
Objective: The aim of this study is to design and develop a novel navigation framework that alarms the surgeon with sound during drilling and dynamically renders the high quality medical image data. Method: The accuracy of the proposed system were measured with a skull model using paired point registration and the target registration error (TRE) was computed. We segmented the accurate structure of target and compute the minimum distance between the drill tip and the target. Once the drill tip approached the target structures, the system would alarm the surgeon...
May 20, 2017: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29769139/double-bundle-anterior-cruciate-ligament-reconstruction-improves-tibial-rotational-instability-analysis-of-squatting-motion-using-a-2d-3d-registration-technique
#7
Kenichi Kidera, Akihiko Yonekura, Takeshi Miyaji, Yusuke Nakazoe, Kazuyoshi Gamada, Kei Yoneta, Futoshi Ikuta, Masato Tomita, Takashi Miyamoto, Shiro Kajiyama, Akira Hozumi, Ko Chiba, Narihiro Okazaki, Takayuki Shida, Makoto Osaki
BACKGROUND: The anterior cruciate ligament-deficient (ACLD) knee requires appropriate treatment for the patient to return to sports. The purpose of this study was to clarify the kinematics of the anterior cruciate ligament-deficient knee in squatting motion before and after double-bundle anterior cruciate ligament reconstruction (DB-ACLR) using a 2D/3D registration technique. METHODS: The subjects of this study were 10 men with confirmed unilateral ACL rupture who underwent DB-ACLR...
May 16, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29769060/biopro-rcmi-1505-trial-multicenter-study-evaluating-the-use-of-a-biodegradable-balloon-for-the-treatment-of-intermediate-risk-prostate-cancer-by-intensity-modulated-radiotherapy-study-protocol
#8
David Pasquier, Emilie Bogart, François Bonodeau, Thomas Lacornerie, Eric Lartigau, Igor Latorzeff
BACKGROUND: Prospective trials have demonstrated the advantage of dose-escalated radiotherapy for the biochemical and clinical control of intermediate risk prostate cancer. Dose escalation improves outcomes but increases risks of urinary and bowel toxicity. Recently the contribution of "spacers" positioned in the septum between the rectum and the prostate could improve the functional results of intensity modulated radiation therapy (IMRT). To date most of the evaluated devices were polyethylen glycol (PEG) and hyaluronic acid (HA)...
May 16, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29766442/rate-of-improvement-of-pain-and-function-in-mid-portion-achilles-tendinopathy-with-loading-protocols-a-systematic-review-and-longitudinal-meta-analysis
#9
REVIEW
Myles Murphy, Mervyn Travers, William Gibson, Paola Chivers, James Debenham, Sean Docking, Ebonie Rio
BACKGROUND: Mid-portion Achilles tendinopathy is prevalent within both the athletic and non-athletic populations and loading protocols for Achilles tendinopathy are effective over time, though the rate of symptom change throughout rehabilitation is unknown. OBJECTIVE: The objective of this study was to determine the rate of change in pain and function over time in patients while completing a loading protocol for mid-portion Achilles tendinopathy. METHODS: A systematic review and longitudinal meta-analysis was conducted as per the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines...
May 15, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29766322/microdaimon-study-microcirculatory-daily-monitoring-in-critically-ill-patients-a-prospective-observational-study
#10
Claudia Scorcella, Elisa Damiani, Roberta Domizi, Silvia Pierantozzi, Stefania Tondi, Andrea Carsetti, Silvia Ciucani, Valentina Monaldi, Mara Rogani, Benedetto Marini, Erica Adrario, Rocco Romano, Can Ince, E Christiaan Boerma, Abele Donati
BACKGROUND: Until now, the prognostic value of microcirculatory alterations in critically ill patients has been mainly evaluated in highly selected subgroups. Aim of this study is to monitor the microcirculation daily in mixed group of Intensive Care Unit (ICU)-patients and to establish the association between (the evolution of) microcirculatory alterations and outcome. METHODS: This is a prospective longitudinal observational single-centre study in adult patients admitted to a 12-bed ICU in an Italian teaching hospital...
May 15, 2018: Annals of Intensive Care
https://www.readbyqxmd.com/read/29765093/accurate-and-fiducial-marker-free-correction-for-three-dimensional-chromatic-shift-in-biological-fluorescence-microscopy
#11
Atsushi Matsuda, Lothar Schermelleh, Yasuhiro Hirano, Tokuko Haraguchi, Yasushi Hiraoka
Correction of chromatic shift is necessary for precise registration of multicolor fluorescence images of biological specimens. New emerging technologies in fluorescence microscopy with increasing spatial resolution and penetration depth have prompted the need for more accurate methods to correct chromatic aberration. However, the amount of chromatic shift of the region of interest in biological samples often deviates from the theoretical prediction because of unknown dispersion in the biological samples. To measure and correct chromatic shift in biological samples, we developed a quadrisection phase correlation approach to computationally calculate translation, rotation, and magnification from reference images...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29762575/intrinsic-bias-in-fisher-information-calculations-for-multi-mode-image-registration
#12
David W Tyler
To address the need for the analysis of image processing and optical requirements in multi-mode imaging systems, such as multi-spectral and polarimetric imagers, I have developed a Fisher information matrix to quantify errors in estimating the shift between images with non-transformational feature differences. If images of the same field have differences not attributable to a geometric transformation, as is common for images acquired using different spectral or polarization filters, uncertainty in estimating the parameters of the transformation will be increased by intrinsic bias, or bias inherent in the data itself, as opposed to bias originating in the estimation algorithm...
May 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29757743/local-all-pass-geometric-deformations
#13
Christopher Gilliam, Thierry Blu
This paper deals with the estimation of a deformation that describes the geometric transformation between two images. To solve this problem, we propose a novel framework that relies upon the brightness consistency hypothesis-a pixel's intensity is maintained throughout the transformation. Instead of assuming small distortion and linearizing the problem (e.g. via Taylor Series expansion), we propose to interpret the brightness hypothesis as an all-pass filtering relation between the two images. The key advantages of this new interpretation are that no restrictions are placed on the amplitude of the deformation or on the spatial variations of the images...
February 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29757560/-application-of-image-guided-technique-in-rhino-orbital-related-endoscopic-surgery
#14
Jin Mei Xue, Yuan Hui Li, Yan Ting Zhang, Fang Ling Guan, Li He Duan, Chang Qing Zhao
Objective: To review retrospectively six cases of rhino-orbital related endoscopic surgeries aided by Fusion electromagnetic system,to explore the indications and clinical value of image guided technique in endonasal endoscopic surgery. Method: Retrospective research methods were used.In this study,six cases of nasal endoscopic sinus surgery using Fusion electromagnetic system were analyzed,including 1 nasal penetrating foreign body,2 optic nerve decompressions,1 orbital apex hemangioma,1 sieve frontal sinus cyst,1 intraorbital mass biopsy...
January 20, 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29757473/iterative-inversion-of-deformation-vector-fields-with-feedback-control
#15
Abhishek Kumar Dubey, Alexandros-Stavros Iliopoulos, Xiaobai Sun, Fang-Fang Yin, Lei Ren
PURPOSE: Often, the inverse deformation vector field (DVF) is needed together with the corresponding forward DVF in 4D reconstruction and dose calculation, adaptive radiation therapy, and simultaneous deformable registration. This study aims at improving both accuracy and efficiency of iterative algorithms for DVF inversion, and advancing our understanding of divergence and latency conditions. METHOD: We introduce a framework of fixed-point iteration algorithms with active feedback control for DVF inversion...
May 14, 2018: Medical Physics
https://www.readbyqxmd.com/read/29755717/patternize-an-r-package-for-quantifying-colour-pattern-variation
#16
Steven M Van Belleghem, Riccardo Papa, Humberto Ortiz-Zuazaga, Frederik Hendrickx, Chris D Jiggins, W Owen McMillan, Brian A Counterman
The use of image data to quantify, study and compare variation in the colors and patterns of organisms requires the alignment of images to establish homology, followed by color-based segmentation of images. Here we describe an R package for image alignment and segmentation that has applications to quantify color patterns in a wide range of organisms. patternize is an R package that quantifies variation in color patterns obtained from image data. patternize first defines homology between pattern positions across specimens either through manually placed homologous landmarks or automated image registration...
February 2018: Methods in Ecology and Evolution
https://www.readbyqxmd.com/read/29754382/3d-2d-model-to-image-registration-by-imitation-learning-for-cardiac-procedures
#17
Daniel Toth, Shun Miao, Tanja Kurzendorfer, Christopher A Rinaldi, Rui Liao, Tommaso Mansi, Kawal Rhode, Peter Mountney
PURPOSE: In cardiac interventions, such as cardiac resynchronization therapy (CRT), image guidance can be enhanced by involving preoperative models. Multimodality 3D/2D registration for image guidance, however, remains a significant research challenge for fundamentally different image data, i.e., MR to X-ray. Registration methods must account for differences in intensity, contrast levels, resolution, dimensionality, field of view. Furthermore, same anatomical structures may not be visible in both modalities...
May 12, 2018: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/29752611/comparison-of-electroacupuncture-and-mild-warm-moxibustion-on-brain-gut-function-in-patients-with-constipation-predominant-irritable-bowel-syndrome-a-randomized-controlled-trial
#18
Ji-Meng Zhao, Jin-Hua Lu, Xiao-Jun Yin, Lu-Yi Wu, Chun-Hui Bao, Xing-Kui Chen, Yue-Hua Chen, Wei-Jun Tang, Xiao-Ming Jin, Huan-Gan Wu, Yin Shi
OBJECTIVE: To compare the effects of electroacupuncture (EA) and mild-warm moxibustion (Mox) therapies for constipation-predominant irritable bowel syndrome (C-IBS) patients. METHODS: Sixty C-IBS patients were assigned to 2 groups by simple randomized method, i.e. EA group (30 cases) and Mox group (30 cases). Both EA and Mox treatments were performed on bilateral Tianshu (ST 25) and Shangjuxu (ST 37) for 30 min each time, 6 times per week, for 4 consecutive weeks...
May 2018: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/29752157/evaluation-of-a-novel-software-application-for-magnetic-resonance-distortion-correction-in-cranial-stereotactic-radiosurgery
#19
Juan-Francisco Calvo-Ortega, José Mateos, Ángel Alberich, Sandra Moragues, Juan-José Acebes, Sol San José, Joan Casals
This study aimed to validate a novel commercially available software for correcting spatial distortion in cranial magnetic resonance (MR) images. This software has been used to assess the dosimetric impact of MR distortion in stereotactic radiosurgery (SRS) treatments of vestibular schwannomas (VSs). Five MR datasets were intentionally distorted. Each distorted MR dataset was corrected using the Cranial Distortion software, obtaining a new corrected MR dataset (MRcorr). The accuracy of the correction was quantified by calculating the target registration error (TRE) for 6 anatomical landmarks identified in the co-registered MRcorr and planning computed tomography (pCT) images...
May 8, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29751801/effectiveness-of-a-multifaceted-implementation-strategy-compared-to-usual-care-on-low-back-pain-guideline-adherence-among-general-practitioners
#20
Arnela Suman, Frederieke G Schaafsma, Peter M van de Ven, Pauline Slottje, Rachelle Buchbinder, Maurits W van Tulder, Johannes R Anema
BACKGROUND: To improve patient care, and to reduce unnecessary referrals for diagnostic imaging and medical specialist care for low back pain, an evidence-based guideline for low back pain was developed in the Netherlands in 2010. The current study evaluated the effect of a multifaceted implementation strategy on guideline adherence among Dutch general practitioners. METHODS: The implementation strategy included a multidisciplinary training, provision of educational material and an interactive website for healthcare professionals, supported by a multimedia eHealth intervention for patients with low back pain...
May 11, 2018: BMC Health Services Research
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