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https://www.readbyqxmd.com/read/29775146/setting-pressure-can-change-the-size-and-shape-of-mri-artifacts-caused-by-adjustable-shunt-valves-a-study-of-the-4-newest-models
#1
Daiki Uchida, Yuki Amano, Hirokazu Nakatogawa, Takayuki Masui, Naoto Ando, Teiji Nakayama, Haruhiko Sato, Tetsuro Sameshima, Tokutaro Tanaka
OBJECTIVE Adjustable shunt valves that have been developed for the management of hydrocephalus all rely on intrinsically magnetic components, and artifacts with these valves on MRI are thus inevitable. The authors have previously reported that the shapes of shunt artifacts differ under different valve pressures with the proGAV 2.0 valve. In the present study the authors compared the size and shape of artifacts at different pressure settings with 4 new-model shunt valves. METHODS The authors attached 4 new models of MRI-resistant shunt valve to the temporal scalp of a healthy volunteer: the proGAV 2...
May 18, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29773856/hyperbaric-oxygen-can-induce-angiogenesis-and-recover-erectile-function
#2
Amir Hadanny, Erez Lang, Laurian Copel, Oshra Meir, Yair Bechor, Gregory Fishlev, Jacob Bergan, Amnon Zisman, Shai Efrati
Erectile dysfunction (ED) is caused by microvascular or macrovascular insufficiency in the majority of patients. Recent studies have shown that hyperbaric oxygen therapy (HBOT) can induce angiogenesis in different body organs. The effect of HBOT on the non-surgery-related ED has not been investigated yet. The aim of the current study was to evaluate the effects of HBOT on sexual function and penile vascular bed in non-surgical ED patients. A prospective analysis of patients suffering from chronic ED treated with 40 daily HBOT sessions...
May 18, 2018: International Journal of Impotence Research
https://www.readbyqxmd.com/read/29771283/adolescents-at-high-risk-of-obesity-show-greater-striatal-response-to-increased-sugar-content-in-milkshakes
#3
Grace E Shearrer, Eric Stice, Kyle S Burger
Background: Children of overweight or obese parents are at a high risk of developing obesity. Objective: This study sought to examine the underlying neural factors related to parental obesity risk and the relative impact of sugar and fat when consuming a palatable food, as well as the impact of obesity risk status on brain response to appetizing food images. Design: With the use of functional MRI, the responses of 108 healthy-weight adolescents [mean ± SD body mass index (kg/m2): 20...
May 16, 2018: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29770772/fse-t2-weighted-two-point-dixon-technique-for-fat-suppression-in-the-lumbar-spine-comparison-with-spair-technique
#4
Sangmin Lee, Dae Seob Choi, Hwa Seon Shin, Hye Jin Baek, Ho Cheol Choi, Sung Eun Park
PURPOSE: Fat suppression magnetic resonance imaging (MRI) technique has been used to improve the diagnostic confidence in lumbar spine diseases. We aimed to compare T2-weighted water-fat separation technique (T2 Dixon) with spectral attenuated inversion recovery (SPAIR) image for fat suppression. METHODS: Lumbar spine MRI examinations were performed in 79 patients by using a 3.0 T machine. We compared T2 Dixon water-only image and SPAIR image for the evaluation of fat suppression quality and lesion conspicuity...
May 2018: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/29770581/effect-of-static-compression-loads-on-intervertebral-disc-an-in-vivo-bent-rat-tail-model
#5
Wei Xia, Lin-Lin Zhang, Jun Mo, Wen Zhang, Hai-Tao Li, Zong-Ping Luo, Hui-Lin Yang
OBJECTIVE: To evaluate how well different magnitudes of compression-induced degenerative changes using a bent rat tail model simulated human lumbar lordosis. It has been shown that compression plays an important role in intervertebral disc degeneration (IDD). METHODS: Sprague-Dawley rats (n = 25) were instrumented with a special compressive apparatus that was used to bend the intervertebral disc between the 8th and the 10th caudal vertebral bodies using two Kirschner wires inserted percutaneously into the middle of two tail vertebrae...
May 16, 2018: Orthopaedic Surgery
https://www.readbyqxmd.com/read/29758582/-relevance-of-mri-after-closed-reduction-of-traumatic-hip-dislocation-in-children
#6
Christoph Mauritz Strüwind, Christian von Rüden, Andreas Thannheimer, Volker Bühren, Dorien Schneidmueller
BACKGROUND: Traumatic hip dislocation in children and adolescents is a rare entity that typically results from high-energy trauma. After closed joint reduction, further treatment depends on the specific pattern of the lesion as identified using cross sectional imaging. The aim of this retrospective analysis was to evaluate relevant side effects after traumatic hip dislocation in children and adolescents in order to examine the need for focused diagnostics. PATIENTS/MATERIAL AND METHODS: This retrospective analysis covered 8 adolescents under 18 years suffering isolated traumatic hip joint dislocation between 2001 and 2017...
May 14, 2018: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29758089/current-commercial-techniques-for-mri-guided-attenuation-correction-are-insufficient-and-will-limit-the-wider-acceptance-of-pet-mri-technology-in-the-clinic
#7
Ciprian Catana, Harald H Quick, Habib Zaidi
Whole-body hybrid PET/MR imaging has been used since its introduction in 2010 in clinical and research settings for diagnosis, staging and restaging, assessment of response to treatment and radiation therapy planning. However, the quantitative potential of PET/MRI is challenged by the lack of reliable and accurate MRI-guided attenuation correction (MRAC) owing to the lack of direct relationship between MRI signal, reflecting proton density and relaxation time properties, and electron density, which is linked to photon attenuation properties of biological tissues...
May 14, 2018: Medical Physics
https://www.readbyqxmd.com/read/29757471/image-based-retrospective-4d-mri-in-external-beam-radiotherapy-a-comparative-study-with-a-digital-phantom
#8
Chiara Paganelli, John Kipritidis, Danny Lee, Guido Baroni, Paul Keall, Marco Riboldi
PURPOSE: Several image-based retrospective sorting methods of 4D Magnetic Resonance Imaging (4D MRI) have been proposed for respiratory motion reconstruction in external beam radiotherapy. However, the optimal strategy for providing accurate and artefact-free 4D MRI, ideally corresponding to an average breathing cycle, is not yet defined. This study presents a proactive comparison of three published image-based sorting methods, to define a groundwork for benchmarking in 4D MRI. METHODS: Three published 4D MRI methods were selected for image retrospective sorting; body area, mutual information and navigator slice...
May 14, 2018: Medical Physics
https://www.readbyqxmd.com/read/29750846/evaluation-of-the-diagnostic-accuracy-of-skeletal-scintigraphy-for-the-causes-of-front-foot-pain-determined-by-magnetic-resonance-imaging
#9
Laura E Quiney, Joanne L Ireland, Sue J Dyson
There is good correlation between increased radiopharmaceutical uptake anywhere in the feet of sports or leisure horses and the presence of foot pain. However, low sensitivity of scintigraphy for identifying lesions contributing to foot pain as determined by magnetic resonance imaging (MRI) has been reported. The aim of this retrospective, cross-sectional, analytical study was to assess the accuracy of scintigraphy for identifying the cause(s) of foot pain, using MRI as the reference standard. Sports and leisure horses that underwent both skeletal scintigraphy and MRI of the front feet between March 2008 and December 2014 and for which a definitive diagnosis of the cause(s) of front foot pain was reached were included (121 feet of 70 horses)...
May 11, 2018: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/29741977/laparoscopic-pelvic-exenteration-for-locally-advanced-rectal-cancer-technique-and-short-term-outcomes
#10
Ashish Pokharkar, Praveen Kammar, Ashwin D'souza, Rahul Bhamre, Pavan Sugoor, Avanish Saklani
BACKGROUND: Since last two decades minimally invasive techniques have revolutionized surgical field. In 2003 Pomel first described laparoscopic pelvic exenteration, since then very few reports have described minimally invasive approaches for total pelvic exenteration. METHODS: We report the 10 cases of locally advanced rectal adenocarcinoma which were operated between the periods from March 1, 2017 to November 11, 2017 at the Tata Memorial Hospital, Mumbai. All male patients had lower rectal cancer with prostate involvement on magnetic resonance imaging (MRI)...
May 9, 2018: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/29734487/cortical-thickness-and-white-matter-integrity-abnormalities-in-obsessive-compulsive-disorder-a-combined-multimodal-surface-based-morphometry-and-tract-based-spatial-statistics-study
#11
Cong Zhou, Jian Xu, Liangliang Ping, Fengrui Zhang, Wei Chen, Zonglin Shen, Linling Jiang, Xiufeng Xu, Yuqi Cheng
BACKGROUND: Cerebral morphological abnormalities may play a key role in pathogenesis of obsessive-compulsive disorder (OCD). However, few studies have used multimodal imaging strategies to investigate alterations of cortical morphometry and white matter (WM) integrity. This study aimed to evaluate cortical thickness, cortical and subcortical volume, and WM integrity characteristics in OCD patients comprehensively. METHODS: We acquired magnetic resonance imaging (MRI) scans from 52 OCD patients and 46 well-matched healthy controls (HCs)...
May 7, 2018: Depression and Anxiety
https://www.readbyqxmd.com/read/29728519/first-in-human-pet-study-of-3-novel-tau-radiopharmaceuticals-11-c-ro6924963-11-c-ro6931643-and-18-f-ro6958948
#12
Dean F Wong, Robert Comley, Hiroto Kuwabara, Paul B Rosenberg, Susan M Resnick, Susanne Ostrowitzki, Cristina Vozzi, Frank Boess, Esther Oh, Constantine G Lyketsos, Michael Honer, Luca Gobbi, Gregory Klein, Noble George, Lorena Gapasin, Kelly Kitzmiller, Joshua Roberts, Jeff Sevigny, Ayon Nandi, James R Brasic, Chakradhar Mishra, Madhav Thambisetty, Abhay Moghekar, Anil Mathur, Marilyn Albert, Robert F Dannals, Edilio Borroni
Background: [11 C]RO-963, [11 C]RO-643 and [18 F]RO-948 (previously referred as [11 C]RO6924963, [11 C]RO6931643, and [18 F]RO6958948, respectively) have been reported as promising PET tracers for tau imaging based on in vitro and preclinical PET data (1,2). Here we describe the first human evaluation of these novel radiotracers. Methods: Amyloid PET positive Alzheimer's disease (AD) patients and young healthy subjects (YC) each received two different tau tracers. Dynamic 90 min scans were obtained after bolus injection of [11 C]RO-963, [11 C]RO-643 or [18 F]RO-948...
May 4, 2018: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29725965/assessment-of-stability-and-discrimination-capacity-of-radiomic-features-on-apparent-diffusion-coefficient-images
#13
Marco Bologna, Valentina D A Corino, Eros Montin, Antonella Messina, Giuseppina Calareso, Francesca G Greco, Silvana Sdao, Luca T Mainardi
The objectives of the study are to develop a new way to assess stability and discrimination capacity of radiomic features without the need of test-retest or multiple delineations and to use information obtained to perform a preliminary feature selection. Apparent diffusion coefficient (ADC) maps were computed from diffusion-weighted magnetic resonance images (DW-MRI) of two groups of patients: 18 with soft tissue sarcomas (STS) and 18 with oropharyngeal cancers (OPC). Sixty-nine radiomic features were computed, using three different histogram discretizations (16, 32, and 64 bins)...
May 3, 2018: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/29723567/novel-observations-of-female-genital-anatomy-in-classic-bladder-exstrophy-using-three-dimensional-mri-reconstruction
#14
Karl S Benz, Emily Dunn, Meiyappan Solaiyappan, Mahir Maruf, Matthew Kasprenski, John Jayman, Jason E Michaud, James Facciola, John P Gearhart
PURPOSE: Understanding the distinct female anatomy in classic bladder exstrophy is crucial for optimal reconstructive and functional outcomes. This study presents novel quantitative anatomical data in females with classic bladder exstrophy prior to primary closure. MATERIALS AND METHODS: Patients underwent three-dimensional reconstruction of pelvic magnetic resonance imaging studies, and pelvic anatomy was characterized, including measurements of the vagina, cervix, and erectile bodies...
April 30, 2018: Journal of Urology
https://www.readbyqxmd.com/read/29720936/the-effects-of-tai-chi-intervention-on-healthy-elderly-by-means-of-neuroimaging-and-eeg-a-systematic-review
#15
Zhujun Pan, Xiwen Su, Qun Fang, Lijuan Hou, Younghan Lee, Chih C Chen, John Lamberth, Mi-Lyang Kim
Aging is a process associated with a decline in cognitive and motor functions, which can be attributed to neurological changes in the brain. Tai Chi, a multimodal mind-body exercise, can be practiced by people across all ages. Previous research identified effects of Tai Chi practice on delaying cognitive and motor degeneration. Benefits in behavioral performance included improved fine and gross motor skills, postural control, muscle strength, and so forth. Neural plasticity remained in the aging brain implies that Tai Chi-associated benefits may not be limited to the behavioral level...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29718744/osteonecrosis-in-children-with-acute-lymphoblastic-leukemia-at-initial-diagnosis-and-prior-to-any-chemotherapy
#16
Kathinka Krull, Marina Kunstreich, Annika Bronsema, Kirsten Bleckmann, Carl-Friedrich Classen, Bernhard Erdlenbruch, Norbert Jorch, Reinhard Kolb, Alfred Leipold, Olga Moser, Aram Prokop, Wolfram Scheurlen, Daniel Steinbach, Janina Klasen-Sansone, Dirk Klee, Gabriele Escherich, Anja Moericke, Martin Schrappe, Arndt Borkhardt, Michaela Kuhlen
Osteonecrosis (ON) is a common and debilitating side effect of anti-leukemic treatment in children with acute lymphoblastic leukemia (ALL). However, the impact of leukemia itself on ON development remains elusive. We analyzed 76 children enrolled in the ongoing OPAL trial, who had magnetic resonance imaging (MRI) studies at diagnosis. MRI screening revealed 14 osteonecrotic lesions (5 × hips, 9 × knees) of any grade (I-III) in 7 (9.2%) patients. Six months on, the number of ON per patient increased (1 patient), remained constant (2), and decreased (2)...
May 2, 2018: Leukemia & Lymphoma
https://www.readbyqxmd.com/read/29717034/magnetic-resonance-imaging-of-bilateral-hands-is-more-optimal-than-mri-of-unilateral-hands-for-rheumatoid-arthritis
#17
Ying-Qian Mo, Ze-Hong Yang, Hai-Ning He, Jian-Da Ma, Jin-Jian Liang, Wei-Ke Zeng, Guang-Zi Shi, Jun Shen, Lie Dai
OBJECTIVE: To explore the advantages of magnetic resonance imaging (MRI) of bilateral hands in rheumatoid arthritis (RA). METHODS: Consecutive patients with active RA were recruited for clinical assessments, radiographs, and MRI of bilateral hands. Bilateral hands were scanned simultaneously on 3.0 T whole-body MRI system and were scored on synovitis, osteitis, and bone erosion according to the RA MRI scoring (RAMRIS) system. RESULTS: Among 120 patients included, wrist bones and metacarpophalangeal joint (MCPJ) 2 proximal showed bone erosion in early RA...
May 1, 2018: Journal of Rheumatology
https://www.readbyqxmd.com/read/29713529/an-objective-study-of-anatomic-shifts-in-intracranial-hypotension-using-four-anatomic-planes
#18
Shamar J Young, Ronald G Quisling, Sharatchandra Bidari, Tina S Sanghvi
Purpose: Intracranial hypotension (IH) often remains undetected using current MR diagnostic criteria. This project aims to demonstrate that central incisural herniation is highly effective in helping to make this diagnosis. Materials and Methods: Magnetic resonance imaging (MRI) was analyzed in 200 normal and 81 clinically known IH patients. MRI reference lines approximating the plane of the incisura, the plane of the diaphragma sella, the plane of the foramen magnum, and the plane of the visual pathway were utilized to measure the position of selected brain structures relative to these reference lines...
2018: Radiology Research and Practice
https://www.readbyqxmd.com/read/29705037/perspectives-mri-of-angiogenesis
#19
Michal Neeman
Angiogenesis, the expansion of the vascular bed, is an important component in remodeling of tissues and organs. Such remodeling is essential for coping with substantial and sustained increase in the demands for supply of oxygen and nutrients and the timely removal of waste products. The vasculature, and its effectiveness in systemic delivery to all parts of the body, regulates the distribution of immune cells and the delivery of therapeutics as well as the dissemination of disease. Therefore, the vascular bed is possibly one of the key organs involved in homeostasis, in health and disease...
April 12, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29696443/relationship-between-functional-imaging-and-immunohistochemical-markers-and-prediction-of-breast-cancer-subtype-a-pet-mri-study
#20
Mariarosaria Incoronato, Anna Maria Grimaldi, Carlo Cavaliere, Marianna Inglese, Peppino Mirabelli, Serena Monti, Umberto Ferbo, Emanuele Nicolai, Andrea Soricelli, Onofrio Antonio Catalano, Marco Aiello, Marco Salvatore
PURPOSE: The aim of this study was to determine if functional parameters extracted from the hybrid positron emission tomography/magnetic resonance imaging (PET/MRI) correlate with the immunohistochemical markers of breast cancer (BC) lesions, to assess their ability to predict BC subtype. METHODS: This prospective study was approved by the institution's Ethics Committee, and all patients provided written informed consent. A total of 50 BC patients at diagnosis underwent PET/MRI before pharmacological and surgical treatment...
April 25, 2018: European Journal of Nuclear Medicine and Molecular Imaging
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