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https://www.readbyqxmd.com/read/28718319/medical-modeling-for-precision-ulna-reconstruction-using-a-microvascular-fibula-free-flap
#1
Michael Alperovich, Jonathan M Bekisz, Vishal D Thanik
BACKGROUND: Despite the growing use of medical modeling in other surgical specialties, its utilization in extremity reconstruction has remained limited. METHODS: We present the application of medical modeling for ulna reconstruction using a microvascular fibula free flap. RESULTS: Following a motor vehicle accident, the patient suffered segmental loss of the right radius and ulna with concomitant forearm soft tissue and muscle loss. Using medical modeling, imaging from the unaffected contralateral forearm and lower extremity was used to plan a reconstruction that restored the anatomic length and orientation of the ulna...
January 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28716466/chronic-low-back-pain-patients-walk-with-locally-altered-spinal-kinematics
#2
Guillaume Christe, François Kade, Brigitte M Jolles, Julien Favre
Various studies have reported alterations of spinal kinematics in patients with chronic low back pain (CLBP) during gait. However, while recent findings stressed the importance of multi-segment analysis, most of prior gait studies modelled the lumbar spine as one segment, when it was not the entire trunk that was considered as a single segment. Therefore, there is a need for comprehensive multi-segment research that could improve our understanding of CLBP pathomechanism and thus possibly contribute to better care for CLBP...
July 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28715317/itk-snap-an-intractive-medical-image-segmentation-tool-to-meet-the-need-for-expert-guided-segmentation-of-complex-medical-images
#3
Paul A Yushkevich, Guido Gerig
Imaging is a crucial tool in medicine and biomedical research. Magnetic resonance imaging (MRI), computational tomography (CT), proton emission tomography (PET), and ultrasound are routinely used not only to diagnose disease but also to plan and guide surgical interventions, track disease progression, measure the response of the body to treatment, and understand how genetic and environmental factors relate to anatomical and functional phenotypes.
July 2017: IEEE Pulse
https://www.readbyqxmd.com/read/28713426/3d-morphology-analysis-of-tmj-articular-eminence-in-magnetic-resonance-imaging
#4
Izabella Nascimento Falcão, Maria Beatriz Carrazzone Cal Alonso, Lucas Hian da Silva, Sérgio Lúcio Pereira de Castro Lopes, Lívia Pichi Comar, André Luiz Ferreira Costa
PURPOSE: The objective of this study was to evaluate the computational reconstruction of the articular eminence of the temporomandibular joint (TMJ) based on magnetic resonance imaging (MRI) and semiautomatic volumetric segmentation techniques for morphological classification of the TMJ structure. MATERIALS AND METHODS: A total of 36 MRI scans of TMJ individuals were selected and formatted by using the ITK-SNAP software, consisting of MRI segmentation and generation of 3D models...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28712560/relation-between-severity-of-myocardial-bridge-and-vasospasm
#5
Yuichi Saito, Hideki Kitahara, Toshihiro Shoji, Satoshi Tokimasa, Takashi Nakayama, Kazumasa Sugimoto, Yoshihide Fujimoto, Yoshio Kobayashi
BACKGROUND: Myocardial bridge (MB) has been reported to induce cardiac complications including coronary vasospasm. Although MB has some anatomical and morphological variations, the association of these variations with vasospasm is unclear. The aim of this study was to investigate the relation between morphological severity of MB and vasospasm induced by acetylcholine (ACh) provocation test. METHODS: A total of 392 patients without coronary stent in the left anterior descending artery (LAD) undergoing intracoronary ACh provocation test were included...
July 5, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28712282/deformable-image-registration-in-radiation-therapy
#6
REVIEW
Seungjong Oh, Siyong Kim
The number of imaging data sets has significantly increased during radiation treatment after introducing a diverse range of advanced techniques into the field of radiation oncology. As a consequence, there have been many studies proposing meaningful applications of imaging data set use. These applications commonly require a method to align the data sets at a reference. Deformable image registration (DIR) is a process which satisfies this requirement by locally registering image data sets into a reference image set...
June 2017: Radiation Oncology Journal
https://www.readbyqxmd.com/read/28709050/anomalous-v-2-of-the-left-pulmonary-vein-detected-using-three-dimensional-computed-tomography-in-a-patient-with-lung-cancer-a-case-report
#7
Masato Aragaki, Yasuaki Iimura, Yusuke Yoshida, Naoto Hasegawa
We report one of the rare anatomical variations of the pulmonary vein wherein the left V2 drained into the inferior pulmonary vein. A 63-year-old man was referred to our hospital because of an abnormal shadow in the left lower lung field that was noted on chest X-ray. Computed tomography (CT) revealed a tumor in the left lower lobe. A biopsied tumor specimen was diagnosed as an adenocarcinoma, and thus, left lower lobectomy was performed. Preoperative three-dimensional CT revealed that an anomalous V2 of the left lung drained from the superior segment into the inferior pulmonary vein...
June 29, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28708129/validation-of-a-novel-imaging-approach-using-multi-slice-ct-and-cone-beam-ct-to-follow-up-on-condylar-remodeling-after-bimaxillary-surgery
#8
Laura Ferreira Pinheiro Nicolielo, Jeroen Van Dessel, Eman Shaheen, Carolina Letelier, Marina Codari, Constantinus Politis, Ivo Lambrichts, Reinhilde Jacobs
The main goal of this study was to introduce a novel three-dimensional procedure to objectively quantify both inner and outer condylar remodelling on preoperative multi-slice computed tomography (MSCT) and postoperative cone-beam computed tomography (CBCT) images. Second, the reliability and accuracy of this condylar volume quantification method was assessed. The mandibles of 20 patients (11 female and 9 male) who underwent bimaxillary surgery were semi-automatically extracted from MSCT/CBCT scans and rendered in 3D...
July 14, 2017: International Journal of Oral Science
https://www.readbyqxmd.com/read/28706185/deep-learning-for-fully-automated-localization-and-segmentation-of-rectal-cancer-on-multiparametric-mr
#9
Stefano Trebeschi, Joost J M van Griethuysen, Doenja M J Lambregts, Max J Lahaye, Chintan Parmer, Frans C H Bakers, Nicky H G M Peters, Regina G H Beets-Tan, Hugo J W L Aerts
Multiparametric Magnetic Resonance Imaging (MRI) can provide detailed information of the physical characteristics of rectum tumours. Several investigations suggest that volumetric analyses on anatomical and functional MRI contain clinically valuable information. However, manual delineation of tumours is a time consuming procedure, as it requires a high level of expertise. Here, we evaluate deep learning methods for automatic localization and segmentation of rectal cancers on multiparametric MR imaging. MRI scans (1...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28705875/electrical-and-structural-substrate-of-arrhythmogenic-right-ventricular-cardiomyopathy-determined-using-noninvasive-electrocardiographic-imaging-and-late-gadolinium-magnetic-resonance-imaging
#10
Christopher M Andrews, Neil T Srinivasan, Stefania Rosmini, Heerajnarain Bulluck, Michele Orini, Sharon Jenkins, Antonis Pantazis, William J McKenna, James C Moon, Pier D Lambiase, Yoram Rudy
BACKGROUND: Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a significant cause of sudden cardiac death in the young. Improved noninvasive assessment of ARVC and better understanding of the disease substrate are important for improving patient outcomes. METHODS AND RESULTS: We studied 20 genotyped ARVC patients with a broad spectrum of disease using electrocardiographic imaging (a method for noninvasive cardiac electrophysiology mapping) and advanced late gadolinium enhancement cardiac magnetic resonance scar imaging...
July 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28704338/analysis-of-metastatic-involvement-in-bone-using-anatomical-and-functional-information-from-18f-fdg-pet-ct
#11
Omer Demirkaya, Mohammed AlQahtani, Abdulaziz Alsugair, Omer Aras, Mohei-Eldin Abouzied
PURPOSE: Although the overall incidence of bone metastasis is not known, over one-half of the people who die of cancer in the USA every year are thought to have bone involvement. In this study we have developed a method to quantify the metabolic and anatomic changes induced by different types of bone metastases in cancer patients using PET/CT images. PATIENTS AND MATERIALS: Seventy-three cancer patients with no previous history of chemotherapy or radiotherapy who had definite bone metastases documented by PET/CT and other conventional modalities were selected for this study...
July 12, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28698909/the-cisternal-segment-of-the-anterior-choroidal-artery-an-anatomical-study-using-magnetic-resonance-imaging
#12
Satoshi Tsutsumi, Hideo Ono, Yukimasa Yasumoto
PURPOSE: The topography of the anterior choroidal artery (AChA) has infrequently been delineated on neuroimages. The present study aimed to explore the cisternal segment of the AChA using magnetic resonance imaging. METHODS: A total of 50 sides of the AChA obtained from 25 patients were included in this study. A constructive interference in steady-state (CISS) sequence was performed in thin-sliced axial sections. Furthermore, the cisternal AChA and relevant neurovascular structures were observed through cadaveric dissections in two heads...
July 11, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28698556/location-sensitive-deep-convolutional-neural-networks-for-segmentation-of-white-matter-hyperintensities
#13
Mohsen Ghafoorian, Nico Karssemeijer, Tom Heskes, Inge W M van Uden, Clara I Sanchez, Geert Litjens, Frank-Erik de Leeuw, Bram van Ginneken, Elena Marchiori, Bram Platel
The anatomical location of imaging features is of crucial importance for accurate diagnosis in many medical tasks. Convolutional neural networks (CNN) have had huge successes in computer vision, but they lack the natural ability to incorporate the anatomical location in their decision making process, hindering success in some medical image analysis tasks. In this paper, to integrate the anatomical location information into the network, we propose several deep CNN architectures that consider multi-scale patches or take explicit location features while training...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698011/clinical-and-morphological-manifestations-of-aniridia-associated-keratopathy-on-anterior-segment-optical-coherence-tomography-and-in-vivo-confocal-microscopy
#14
Anna Voskresenskaya, Nadezhda Pozdeyeva, Tatyana Vasilyeva, Yevgeniy Batkov, Aleksandr Shipunov, Boris Gagloev, Rena Zinchenko
PURPOSE: The study aimed to evaluate clinical and morphological changes in the limbal palisades of Vogt (POV) at different stages of aniridia-associated keratopathy (AAK) and to assess possible utility of anterior segment optical coherence tomography (AS-OCT) for the visualization of limbal progenitor structures as it correlates to laser scanning confocal microscopy (LSCM) data. METHODS: The study involved 32 patients (59 eyes) with congenital aniridia. AAK stage was defined based on biomicroscopy...
July 8, 2017: Ocular Surface
https://www.readbyqxmd.com/read/28694608/surgically-relevant-bony-anatomical-variations-in-paraclinoid-aneurysms-three-dimensional-multi-detector-row-computed-tomography-based-study
#15
K Suprasanna, Ashvini Kumar
OBJECTIVE: To evaluate the proportion of surgically relevant anatomical variations such as caroticoclinoid foramen, interclinoid osseous bridge, and anterior clinoid pneumatization in patients with paraclinoid aneurysms based on computed tomography (CT) cerebral angiography studies. MATERIALS AND METHODS: Fifty-four CT cerebral angiography studies showing paraclinoid aneurysms involving the cavernous, clinoid, and supraclinoid internal carotid artery (ICA) were retrospectively evaluated...
July 2017: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/28693816/anterior-pedicle-spreader-reduction-for-unilateral-cervical-facet-dislocation
#16
Zhengfeng Zhang
OBJECTIVE: The anterior only surgical procedure including discectomy, open reduction and fusion is used as a recommended approach in the treatment of unilateral cervical facet dislocations, but is difficult to achieve satisfactory anterior open reduction by vertebra distractor to spread the facet joints, especially for delayed management of unilateral cervical facet dislocation (7-21days). The goal of this study was to report an anterior pedicle spreader technique to distract directly the facet joint for anterior reduction and the results of 4 patients with successful application and describe safety...
July 6, 2017: Injury
https://www.readbyqxmd.com/read/28693049/hybrid-repair-techniques-for-complex-aneurysms-and-dissections-involving-the-aortic-arch-and-thoracic-aorta
#17
Rami Tadros, Scott R Safir, Peter L Faries, Daniel K Han, Rajiv K Chander, James F McKinsey, Michael L Marin, Allan S Stewart, Sharif Ellozy
Aortic aneurysms involving the ascending aorta, aortic arch, and descending thoracic aorta have been a challenging entity to surgically treat for over 60 years. Despite the mortality of the disease, early open surgical procedures also had significant morbidity and mortality. The inherent risk in treating multiple anatomic segments simultaneously led to the innovation of the staged elephant trunk (ET) approach by Borst in 1983. To avoid the thoracotomy and associated complications related to the second stage of the procedure, an endovascular completion paradigm was begun by Volodos in 1991...
July 11, 2017: Surgical Technology International
https://www.readbyqxmd.com/read/28693000/a-new-active-contours-approach-for-finger-extensor-tendon-segmentation-in-ultrasound-images-using-prior-knowledge-and-phase-symmetry
#18
Nelson Martins, Saad Sultan, Diana Veiga, Manuel Ferreira, Filipa Teixeira, Miguel Coimbra
This work proposes a new approach for the segmentation of the extensor tendon in ultrasound images of the second metacarpophalangeal joint (MCPJ). The MCPJ is known to be frequently involved in early stages of rheumatic diseases like rheumatoid arthritis. The early detection and follow up of these diseases is important to start and adapt the treatments properly and, in that way, preventing irreversible damage of the joints. This work relies on an active contours framework, preceded by a phase symmetry preprocessing and with prior knowledge energies, to automatically identify the extensor tendon...
July 5, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28691470/replica-guided-trauma-surgery
#19
F Laganà, E Segna, A Baj, G Beltramini, A Russillo, V Candotto, F J Silvestre, A B Giannì
The aim of this study is to present a new approach to the surgical treatment of fractures of the middle third of the face, based on the use of resorbable materials and stereolithographic models. From 2009 to 2014, we treated 10 cases of orbitozygomatic trauma mostly as secondary surgery. For each case, an anatomical replica had been produced simulating the expected result and was then used to contour the resorbable plates on its surface, even before the beginning of the surgical procedure itself. The plates and meshes already bended act as a guide to bony reduction procedure...
April 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28691047/location-of-colorectal-cancer-colonoscopy-versus-surgery-yield-of-colonoscopy-in-predicting-actual-location
#20
Juan Pablo Blum-Guzman, Silvio Wanderley de Melo
BACKGROUND AND STUDY AIMS:  Recent studies suggest that differences in biological characteristics and risk factors across cancer site within the colon and rectum may translate to differences in survival. It can be challenging at times to determine the precise anatomical location of a lesion with a luminal view during colonoscopy. The aim of this study is to determine if there is a significant difference between the location of colorectal cancers described by gastroenterologists in colonoscopies and the actual anatomical location noted on operative and pathology reports after colon surgery...
July 2017: Endoscopy International Open
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