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Medical imaging

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https://www.readbyqxmd.com/read/28215003/improved-electromagnetic-tracking-for-catheter-path-reconstruction-with-application-in-high-dose-rate-brachytherapy
#1
Elodie Lugez, Hossein Sadjadi, Chandra P Joshi, Selim G Akl, Gabor Fichtinger
PURPOSE: Electromagnetic (EM) catheter tracking has recently been introduced in order to enable prompt and uncomplicated reconstruction of catheter paths in various clinical interventions. However, EM tracking is prone to measurement errors which can compromise the outcome of the procedure. Minimizing catheter tracking errors is therefore paramount to improve the path reconstruction accuracy. METHODS: An extended Kalman filter (EKF) was employed to combine the nonlinear kinematic model of an EM sensor inside the catheter, with both its position and orientation measurements...
February 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28214968/piloting-the-use-of-patient-specific-cardiac-models-as-a-novel-tool-to-facilitate-communication-during-cinical-consultations
#2
Giovanni Biglino, Despina Koniordou, Marisa Gasparini, Claudio Capelli, Lindsay-Kay Leaver, Sachin Khambadkone, Silvia Schievano, Andrew M Taylor, Jo Wray
This pilot study aimed to assess the impact of using patient-specific three-dimensional (3D) models of congenital heart disease (CHD) during consultations with adolescent patients. Adolescent CHD patients (n = 20, age 15-18 years, 15 male) were asked to complete two questionnaires during a cardiology transition clinic at a specialist centre. The first questionnaire was completed just before routine consultation with the cardiologist, the second just after the consultation. During the consultation, each patient was presented with a 3D full heart model realised from their medical imaging data...
February 18, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28214717/an-interactive-medical-image-segmentation-framework-using-iterative-refinement
#3
Pratik Kalshetti, Manas Bundele, Parag Rahangdale, Dinesh Jangra, Chiranjoy Chattopadhyay, Gaurav Harit, Abhay Elhence
Segmentation is often performed on medical images for identifying diseases in clinical evaluation. Hence it has become one of the major research areas. Conventional image segmentation techniques are unable to provide satisfactory segmentation results for medical images as they contain irregularities. They need to be pre-processed before segmentation. In order to obtain the most suitable method for medical image segmentation, we propose MIST (Medical Image Segmentation Tool), a two stage algorithm. The first stage automatically generates a binary marker image of the region of interest using mathematical morphology...
February 13, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28214296/abnormally-high-and-heterogeneous-bone-matrix-mineralization-after-childhood-solid-organ-transplantation-a-complex-pathology-of-low-bone-turnover-and-local-defects-in-mineralization
#4
Nadja Fratzl-Zelman, Helena Valta, Renata C Pereira, Barbara M Misof, Paul Roschger, Hannu Jalanko, Kathrine Wesseling-Perry, Klaus Klaushofer, Outi Mäkitie
Chronic renal, liver and heart failure in children associates with multiple skeletal complications. Increased fracture incidence often persists after transplantation and could be related to alterations in bone material properties. In the present cohort study we evaluated bone mineralization density distribution (BMDD) by quantitative backscattered electron imaging (qBEI) in 23 pediatric solid organ allograft recipients with suspected osteoporosis. We measured BMDD in the entire cross-sectional area of transiliac bone biopsies obtained from kidney (n = 9), liver (n = 9) and heart (n = 5) transplant recipients (aged 7...
February 18, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28214127/functionalized-superparamagnetic-iron-oxide-nanoparticles-provide-highly-efficient-iron-labeling-in-macrophages-for-magnetic-resonance-based-detection-in-vivo
#5
Jack Sharkey, Philip J Starkey Lewis, Michael Barrow, Salamah M Alwahsh, June Noble, Eilidh Livingstone, Ross J Lennen, Maurits A Jansen, Jaime Garcia Carrion, Neill Liptrott, Shareen Forbes, Dave J Adams, Amy E Chadwick, Stuart J Forbes, Patricia Murray, Matthew J Rosseinsky, Christopher E Goldring, B Kevin Park
BACKGROUND AIMS: Tracking cells during regenerative cytotherapy is crucial for monitoring their safety and efficacy. Macrophages are an emerging cell-based regenerative therapy for liver disease and can be readily labeled for medical imaging. A reliable, clinically applicable cell-tracking agent would be a powerful tool to study cell biodistribution. METHODS: Using a recently described chemical design, we set out to functionalize, optimize and characterize a new set of superparamagnetic iron oxide nanoparticles (SPIONs) to efficiently label macrophages for magnetic resonance imaging-based cell tracking in vivo...
February 15, 2017: Cytotherapy
https://www.readbyqxmd.com/read/28213826/diagnostic-yield-of-ct-urography-in-the-evaluation-of-hematuria-in-young-patients-in-a-military-population
#6
Laura R Mace, Terrel L Galloway, Andrew Ma, Richard S Montgomery, Ryan C Rockhill, William W Reynolds, Robert M Marks
PURPOSE: To assess the diagnostic yield of a computed tomography urography (CTU) study in patients less than 50 years of age, who have a history of military service, and who are at increased risk of urological cancers secondary to harmful practices and work-related exposures. METHODS: 137 Consecutive patients who underwent CTU between 2012 and 2013 for new onset of hematuria were included. Initial review of the clinical interpretations of the CTU studies grouped the studies into negative and positive exams for any urological findings...
February 17, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28213646/auditory-feedback-to-support-image-guided-medical-needle-placement
#7
David Black, Julian Hettig, Maria Luz, Christian Hansen, Ron Kikinis, Horst Hahn
PURPOSE: During medical needle placement using image-guided navigation systems, the clinician must concentrate on a screen. To reduce the clinician's visual reliance on the screen, this work proposes an auditory feedback method as a stand-alone method or to support visual feedback for placing the navigated medical instrument, in this case a needle. METHODS: An auditory synthesis model using pitch comparison and stereo panning parameter mapping was developed to augment or replace visual feedback for navigated needle placement...
February 17, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28213342/virtual-visits-for-acute-nonurgent-care-a-claims-analysis-of-episode-level-utilization
#8
Aliza S Gordon, Wallace C Adamson, Andrea R DeVries
BACKGROUND: Expansion of virtual health care-real-time video consultation with a physician via the Internet-will continue as use of mobile devices and patient demand for immediate, convenient access to care grow. OBJECTIVE: The objective of the study is to analyze the care provided and the cost of virtual visits over a 3-week episode compared with in-person visits to retail health clinics (RHC), urgent care centers (UCC), emergency departments (ED), or primary care physicians (PCP) for acute, nonurgent conditions...
February 17, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28213196/rate-and-risk-factors-of-shunt-revision-in-pediatric-hydrocephalus-patients-population-based-study
#9
Joona Tervonen, Ville Leinonen, Juha E Jääskeläinen, Susanna Koponen, Terhi J Huttunen
BACKGROUND: Ventriculoperitoneal shunt (VPS) is a common treatment for patients with hydrocephalus (HC). However, it carries a risk for complications which may require further revisions. We studied the surgical outcome of pediatric hydrocephalus patients in a population-based setting. METHODS: A total of 80 patients of age ≤16 years old who required VPS due to HC were included, and their medical charts and imaging findings were studied. RESULTS: The mean age at the time of initial shunt placement was 3...
February 14, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28212666/classical-hodgkin-lymphoma-masquerading-as-chronic-recurrent-multifocal-osteomyelitis-a-case-report
#10
Michael Pham, Steven Ressler, Allison Rosenthal, Katalin Kelemen
BACKGROUND: Hodgkin lymphoma is a hematologic malignancy usually confined to lymphatic structures and commonly associated with constitutional symptoms. Bony involvement and musculoskeletal symptoms are uncommon and typically seen in advanced disease. In this case, we report an unusual presentation of classical Hodgkin lymphoma and highlight diagnostic challenges leading to the misdiagnosis and treatment as chronic recurrent multifocal osteomyelitis. CASE PRESENTATION: A 38-year-old white man presented with lower extremity musculoskeletal pain...
February 18, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28212618/clinical-features-and-outcome-in-patients-with-osseomuscular-type-of-wilson-s-disease
#11
Hao Yu, Juan-Juan Xie, Yu-Chao Chen, Qin-Yun Dong, Yi Dong, Wang Ni, Zhi-Ying Wu
BACKGROUND: Wilson's disease with osseomuscular type is a rare condition, which often lacks typical hepatic and neurological symptoms and causes misdiagnoses easily. During the past 10 years, eight Chinese patients of osseomuscular type of Wilson's disease were identified in our clinic. METHODS: Clinical information was gathered from medical records and follow-ups. The genetic testing was performed in each patient. Serum ceruloplasmin, Kayser-Fleischer rings, liver function, brain magnetic resonance imaging and abdominal ultrasonography were also evaluated...
February 17, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28212271/carbon-nanotubes-as-an-effective-opportunity-for-cancer-diagnosis-and-treatment
#12
REVIEW
Alessandro Sanginario, Beatrice Miccoli, Danilo Demarchi
Despite the current progresses of modern medicine, the resistance of malignant tumors to present medical treatments points to the necessity of developing new therapeutic approaches. In recent years, numerous studies have focused their attention on the promising use of nanomaterials, like iron oxide nanowires, zinc oxide or mesoporous silica nanoparticles, for cancer and metastasis treatment with the advantage of operating directly at the bio-molecular scale. Among them, carbon nanotubes emerged as valid candidates not only for drug delivery, but also as a valuable tool in cancer imaging and physical ablation...
February 15, 2017: Biosensors
https://www.readbyqxmd.com/read/28212114/discriminative-feature-representation-an-effective-postprocessing-solution-to-low-dose-ct-imaging
#13
Yang Chen, Jin Liu, Yining Hu, Jian Yang, Luyao Shi, Huazhong Shu, Zhiguo Gui, Gouenou Coatrieux, Limin Luo
This paper proposes a concise and effective approach termed discriminative feature representation (DFR) for low dose computerized tomography (LDCT) image processing, which is currently a challenging problem in medical imaging field. This DFR method assumes LDCT images as the superposition of desirable high dose CT (HDCT) 3D features and undesirable noise-artifact 3D features (the combined term of noise and artifact features induced by low dose scan protocols), and the decomposed HDCT features are used to provide the processed LDCT images with higher quality...
February 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28212054/machine-learning-for-medical-imaging
#14
Bradley J Erickson, Panagiotis Korfiatis, Zeynettin Akkus, Timothy L Kline
Machine learning is a technique for recognizing patterns that can be applied to medical images. Although it is a powerful tool that can help in rendering medical diagnoses, it can be misapplied. Machine learning typically begins with the machine learning algorithm system computing the image features that are believed to be of importance in making the prediction or diagnosis of interest. The machine learning algorithm system then identifies the best combination of these image features for classifying the image or computing some metric for the given image region...
February 17, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28210788/surgical-management-of-degenerative-meniscus-lesions-the-2016-esska-meniscus-consensus
#15
Ph Beaufils, R Becker, S Kopf, M Englund, R Verdonk, M Ollivier, R Seil
PURPOSE: A degenerative meniscus lesion is a slowly developing process typically involving a horizontal cleavage in a middle-aged or older person. When the knee is symptomatic, arthroscopic partial meniscectomy has been practised for a long time with many case series reporting improved patient outcomes. Since 2002, several randomised clinical trials demonstrated no additional benefit of arthroscopic partial meniscectomy compared to non-operative treatment, sham surgery or sham arthroscopic partial meniscectomy...
February 16, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28210767/crohn-s-disease-diagnosis-treatment-approach-and-management-paradigm-what-the-radiologist-needs-to-know
#16
Parakkal Deepak, Sang Hyoung Park, Eric C Ehman, Stephanie L Hansel, Jeff L Fidler, David H Bruining, Joel G Fletcher
Crohn's disease is one of the major subtypes of idiopathic inflammatory bowel disease and is characterized by chronic transmural intestinal inflammation of the gastrointestinal tract anywhere from mouth to the anus, with a predilection for the small bowel. Cross-sectional imaging with computed tomography and magnetic resonance enterography plays a key role in confirming diagnosis, identifying and managing complications, assessing disease severity, and identifying response to medical therapy. This review will focus on the role of radiologists in the diagnosis and assessment of Crohn's disease...
February 16, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28210706/single-balloon-enteroscopy-efficacy-and-degree-of-concordance-with-noninvasive-evaluation-of-small-bowel
#17
Margarida Marques, João Antunes, Rosa Coelho, Hélder Cardoso, Filipe Vilas Boas, Armando Ribeiro, Guilherme Macedo
Background and study aims Clinical impact of single-balloon enteroscopy (SBE) is fairly known, as well as its diagnostic yield comparing with other small bowel gastrointestinal investigations. This study represents a contribution to better understand it and is designed to evaluate SBE efficacy and degree of concordance with previous evaluation of small bowel. Patients and methods This is a single-center retrospective study of patients that underwent SBE with suspected small bowel disease based on non-invasive imaging...
February 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/28210637/anomalous-origin-of-the-left-coronary-artery-from-the-pulmonary-artery-an-uncommon-coronary-anomaly-with-serious-implications-in-adulthood
#18
Venkat Gangadharan, Kamesh Sivagnanam, Ghulam Murtaza, Michael Ponders, Otto Teixeira, Timir Paul
A 36-year-old woman was seen with complaints of exertional chest pain and shortness of breath. Her medical history included atrial fibrillation and diabetes. Physical examination was unremarkable except for an irregular cardiac rhythm. Myocardial perfusion imaging revealed the presence of a large area of infarction involving the entire anterior and apical walls and part of the anteroseptal wall with minimal periinfarct ischemia. Computed tomography coronary angiogram revealed an anomalous left main coronary artery arising from the main pulmonary artery...
January 2017: Journal of Investigative Medicine High Impact Case Reports
https://www.readbyqxmd.com/read/28210619/a-useful-tool-as-a-medical-checkup-in-a-general-population-bioelectrical-impedance-analysis
#19
Mika Enomoto, Hisashi Adachi, Ako Fukami, Eita Kumagai, Sachiko Nakamura, Yume Nohara, Shoko Kono, Erika Nakao, Nagisa Morikawa, Tomoko Tsuru, Akiko Sakaue, Yoshihiro Fukumoto
Accumulation of visceral fat leads to metabolic syndrome and increases risks of cerebro-cardiovascular diseases, which should be recognized and improved at the early stage in general population. Accurate measurement of visceral fat area (VFA) is commonly performed by the abdominal cross-sectional image measured by computed tomography scan, which is, however, limited due to the radiation exposure. The bioelectrical impedance analysis (OMRON, HDS-2000 DUALSCAN(R)) has been recently developed to measure VFA, which is more easily accessible modality...
2017: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28210554/preoperative-psychosocial-characteristics-may-predict-body-image-and-sexuality-two-years-after-risk-reducing-mastectomy-a-prospective-study
#20
Dmytro Unukovych, Hemming Johansson, Yvonne Brandberg
BACKGROUND: Risk-reducing mastectomy (RRM) in patients at high risk has become more available and the rates of both bilateral (BRRM) and contralateral (CRRM) procedures are increasing. For women opting for RRM, psychosocial well-being, body image and sexuality are known to be important patient-reported outcomes. The aim of the present study was to investigate baseline health-related quality of life (HRQoL) and emotional distress (anxiety and depression) as predictors of body image and sexuality two years after RRM in women undergoing CRRM and BRRM...
February 2017: Gland Surgery
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