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Mri techniques

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https://www.readbyqxmd.com/read/29151119/whole-body-magnetic-resonance-imaging-for-detection-of-skeletal-metastases-in-children-and-young-people-with-primary-solid-tumors-systematic-review
#1
A M Smets, E E Deurloo, T J E Slager, J Stoker, S Bipat
BACKGROUND: Many solid neoplasms have a propensity for osteomedullary metastases of which detection is important for staging and subsequent treatment. Whole-body magnetic resonance imaging (WB-MRI) has been shown to accurately detect osteomedullary metastases in adults, but these findings cannot be unconditionally extrapolated to staging of children with malignant solid tumors. OBJECTIVE: To conduct a literature review on the sensitivity of WB-MRI for detecting skeletal metastases in children with solid tumors...
November 18, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29151112/phase-difference-enhanced-magnetic-resonance-mr-imaging-padre-technique-for-the-detection-of-age-related-microstructural-changes-in-optic-radiation-comparison-with-diffusion-tensor-imaging-dti
#2
Yasuko Tatewaki, Tatsushi Mutoh, Benjamin Thyreau, Kazuko Omodaka, Takaki Murata, Atsushi Sekiguchi, Toru Nakazawa, Yasuyuki Taki
BACKGROUND The optic radiation (OR) is a white-matter bundle connecting the lateral geniculate body and the visual cortex. Phase difference-enhanced imaging (PADRE) is a new MRI technique that is able to achieve precise delineation of the OR. The aim of this study was to investigate the effect of age on the volume and signal intensity of the OR using PADRE, and to establish a volumetric reference of the OR from a healthy population, compared with diffusion tensor imaging (DTI). MATERIAL AND METHODS Thirty-nine healthy volunteers underwent MR imaging with PADRE and DTI sequences on a 3...
November 19, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29150799/a-hybrid-approach-based-on-logistic-classification-and-iterative-contrast-enhancement-algorithm-for-hyperintense-multiple-sclerosis-lesion-segmentation
#3
Antonio Carlos da Silva Senra Filho
Multiple sclerosis (MS) is a neurodegenerative disease with increasing importance in recent years, in which the T2 weighted with fluid attenuation inversion recovery (FLAIR) MRI imaging technique has been addressed for the hyperintense MS lesion assessment. Many automatic lesion segmentation approaches have been proposed in the literature in order to assist health professionals. In this study, a new hybrid lesion segmentation approach based on logistic classification (LC) and the iterative contrast enhancement (ICE) method is proposed (LC+ICE)...
November 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29150670/ultrahigh-field-mr-imaging-of-a-subconjunctival-anti-glaucoma-drug-delivery-system-in-a-rabbit-model
#4
Franziska Kopp, Thomas Eickner, Stefan Polei, Karen Falke, Martin Witt, Niels Grabow, Oliver Stachs, Rudolf F Guthoff, Tobias Lindner
Local drug delivery systems (DDS) have become a favourable approach for the treatment of numerous diseases. Biomedical imaging techniques such as ultrahigh field magnetic resonance imaging (UHF-MRI) offer unique insight into DDS biodegradation in vivo. We describe the establishment of a 7 Tesla MRI routine for longitudinal in vivo examinations of a subconjunctival DDS for the treatment of glaucoma in a rabbit model. In initial in vitro examinations the T2-relaxation times of the polymeric DDS components were assessed...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29149728/tuning-magnetic-relaxation-properties-of-hard-cores-in-core-shell-colloids-by-modification-of-soft-shell
#5
Nataliya Shamsutdinova, Rustem Zairov, Irek Nizameev, Aidar Gubaidullin, Alsu Mukhametshina, Sergey Podyachev, Ildus Ismayev, Marsil Kadirov, Alexandra Voloshina, Timur Mukhametzyanov, Asiya Mustafina
The present work introduces an impact of polyelectrolyte-based hydrophilic shell on magnetic relaxivity and luminescence of hard cores built from isostructural complexes of Tb(III) and Gd(III) in the core-shell aqueous colloids. Microscopic and scattering techniques reveal "plum pudding" morphology of the colloids, where polyelectrolyte-coated ultrasmall (<5nm) hard cores form aggregates in aqueous solutions. Interaction of bovine serum albumin (BSA) with the colloids provides a tool to modify the polyelectrolyte-based shell, which is the reason for the improvement in both aggregation behavior of the colloids and their relaxivity...
November 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29148576/free-breathing-abdominal-mri-improved-by-repeated-k-t-subsampling-and-artifact-minimization-rekam
#6
Mei-Lan Chu, Hing-Chiu Chang, Hsiao-Wen Chung, Mustafa R Bashir, Jing Cai, Lei Zhang, Duohua Sun, Nan-Kuei Chen
PURPOSE: We report an approach, termed Repeated k-t-subsampling and artifact-minimization (ReKAM), for removing motion artifacts in free-breathing abdominal MRI. The method is particularly valuable for challenging patients who may not hold their breath for a long time or have irregular respiratory rate. METHODS: The ReKAM framework comprises one acquisition module and two reconstruction modules. A fast MRI sequence is used to repeatedly acquire multiple sets of k-t space data...
November 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/29148288/cochlear-volume-as-a-predictive-factor-for-residual-hearing-preservation-after-conventional-cochlear-implantation
#7
Masahiro Takahashi, Yasuhiro Arai, Naoko Sakuma, Kenichiro Yabuki, Daisuke Sano, Goshi Nishimura, Nobuhiko Oridate, Shin-Ichi Usami
OBJECTIVE: The preservation of residual hearing after conventional cochlear implantation (CI) is frequently observed when atraumatic soft surgery is adopted. The purpose of this study was to elucidate the predictive factors for residual hearing preservation after atraumatic CI. PATIENTS: This study included 46 patients who underwent CI based on an atraumatic technique using a standard-length flexible electrode implant through a round window approach. MAIN OUTCOME MEASURE: Cochlear volume was measured using magnetic resonance imaging (MRI)...
November 17, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29146620/diagnosing-infection-in-a-neonate-using-whole-body-screening-magnetic-resonance-imaging
#8
Ting Ting Fu, Paul S Kingma
The location of invasive infections is difficult to detect in infants, in part due to their inability to localize signs and symptoms. However, identifying the location often significantly alters clinical management by extending the duration of antibiotic therapy or revealing a source requiring surgical intervention. Compared with commonly used first-line imaging techniques such as radiographs and ultrasounds, MRI has higher sensitivity for identifying invasive infections and allows for simultaneous evaluation of multiple foci...
November 16, 2017: Pediatrics
https://www.readbyqxmd.com/read/29146391/small-diameter-hysteroscopic-metroplasty-for-a-septate-uterus-after-open-assisted-laparoscopic-radical-trachelectomy
#9
Akimasa Takahashi, Hiroyuki Kanao, Nobuhiro Takeshima
STUDY OBJECTIVE: To describe a two-step fertility preservation technique for early-stage cervical cancer of a patient with a complete septate uterus. DESIGN: A step-by-step demonstration and explanation of the technique in a surgical video (Canadian Task Force Classification III). SETTING: Center for cancer, a tertiary referral center. The patient provided informed consent to use images and videos of the procedure. Institutional Review Board approval was not required for this kind of procedure...
November 13, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/29145689/-ultra-high-field-mri-in-the-chicken-embryo-in-ovo-a-model-for-experimental-ophthalmology
#10
Ronja Klose, Felix Streckenbach, Stefan Hadlich, Thomas Stahnke, Rudolf Guthoff, Andreas Wree, Marcus Frank, Sönke Langner, Oliver Stachs, Tobias Lindner
Ultra-high-field MRI (UHF-MRI) is an outstanding technique for non-invasive and non-destructive imaging of soft tissues and can provide versatile contrasts and high resolution in the µm range. In vivo imaging of the embryonal chick eye with its filigree anatomical structures imposes these requirements. However, due to the short embryonal development cycle, chicken are a favourite animal model for embryonal research studies. Ultra-high-field MRI allows repeated and longitudinal in ovo investigations on the same embryo...
November 16, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29145421/radiographic-prediction-of-meningioma-grade-by-semantic-and-radiomic-features
#11
Thibaud P Coroller, Wenya Linda Bi, Elizabeth Huynh, Malak Abedalthagafi, Ayal A Aizer, Noah F Greenwald, Chintan Parmar, Vivek Narayan, Winona W Wu, Samuel Miranda de Moura, Saksham Gupta, Rameen Beroukhim, Patrick Y Wen, Ossama Al-Mefty, Ian F Dunn, Sandro Santagata, Brian M Alexander, Raymond Y Huang, Hugo J W L Aerts
OBJECTIVES: The clinical management of meningioma is guided by tumor grade and biological behavior. Currently, the assessment of tumor grade follows surgical resection and histopathologic review. Reliable techniques for pre-operative determination of tumor grade may enhance clinical decision-making. METHODS: A total of 175 meningioma patients (103 low-grade and 72 high-grade) with pre-operative contrast-enhanced T1-MRI were included. Fifteen radiomic (quantitative) and 10 semantic (qualitative) features were applied to quantify the imaging phenotype...
2017: PloS One
https://www.readbyqxmd.com/read/29143190/role-of-magnetic-resonance-imaging-in-the-management-of-perianal-crohn-s-disease
#12
REVIEW
Jose C Gallego, Ana Echarri
Perianal fistulas are a major problem in many patients with Crohn's disease. These are usually complex fistulas that adversely affect patients' quality of life, and their clinical management is difficult. Medical treatment sometimes achieves cessation of discharge and closure of the external opening; however, it is difficult to assess the status of the rest of the fistula tract. Magnetic resonance imaging is the method of choice with which to evaluate the condition of perianal fistulas and allows for assessment of the status of inaccessible areas...
November 15, 2017: Insights Into Imaging
https://www.readbyqxmd.com/read/29143113/percutaneous-ct-guided-sacroiliac-joint-sampling-for-infection-aspiration-biopsy-and-technique
#13
David Knipp, F Joseph Simeone, Sandra B Nelson, Ambrose J Huang, Connie Y Chang
OBJECTIVE: To evaluate methods of CT-guided sacroiliac joint sampling in patients with suspected infection. MATERIALS AND METHODS: All CT-guided sacroiliac joint sampling procedures for suspected infection were reviewed for sampling type (aspiration, lavage aspiration, biopsy), microbiology results, and clinical and imaging follow-up. The primary gold standard was anatomic pathology. If pathology was not available, then positive blood culture with the same organism as SIJ sampling, imaging and clinical follow-up, or clinical follow-up only were used...
November 15, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29143062/-intracranial-cystic-lesions
#14
REVIEW
F Ahlhelm, K Shariat, S Götschi, S Ulmer
CLINICAL PROBLEM: Intracerebral cysts are common findings in imaging of the neurocranium and are not always clinically significant. The pathological spectrum of intracerebral cysts is, however, very broad and in addition to incidental findings includes developmental disorders, malformation tumors, primary and secondary neoplasms and infectious etiologies, such as cerebral abscess formation, cysticercosis or residuals after congenital cytomegalovirus infections. Intracerebral cystic defects may be caused by inflammatory central nervous system (CNS) diseases, such as multiple sclerosis as well as by mitochondriopathies, leukodystrophy, electrolyte disturbances or osmotic demyelination syndrome or brain infarctions, e...
November 15, 2017: Der Radiologe
https://www.readbyqxmd.com/read/29142775/-relevance-of-simpson-s-grades-in-the-resection-of-grade-i-meningiomas
#15
Pablo Ajler, Sofía Beltrame, Daniela Massa, Julian Tramontano, Matteo Baccanelli, Claudio Yampolsky
Objective: Compare the number of recurrences in patients with WHO Grade I meningiomas that underwent microsurgical resection. Introduction: In 1957 Simpson established five grades for surgical resection for intracranial meningiomas and recurrence rate. He thought that an aggressive removal of these tumors with dura and bone was necessary to cure them. Development of new diagnostic methods, advances in anatomopathology and microsurgical technique lead us to question if this scale has a value nowadays...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/29142158/computed-tomography-magnetic-resonance-imaging-and-a-novel-surgical-approach-of-atlanto-axial-instability-with-incongruence-in-dogs
#16
Mario Dolera, Luca Malfassi, Simone Pavesi, Sara Finesso, Giovanni Mazza, Silvia Marcarini, Massimo Sala, Nancy Carrara, Cristina Bianchi, Jennifer M Gambino
Atlanto-axial (AA) instability due to ligament insufficiency is a common cause of cervical spinal cord compression in toy breeds. However, in some dogs a difference in size between the atlas and the axis leads to joint incongruence that exacerbates AA subluxation and makes surgical treatment challenging. Twelve dogs with AA instability with incongruence were enrolled in a single institution prospective observational study. Computed tomography (CT) and magnetic resonance imaging (MRI) of the AA joint were compared to a retrospectively reviewed control group...
November 15, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29141638/diffusion-weighted-imaging-of-the-brains-of-dogs-with-idiopathic-epilepsy
#17
Antje Hartmann, Steffen Sager, Klaus Failing, Marion Sparenberg, Martin J Schmidt
BACKGROUND: Idiopathic epilepsy is one of the most common neurological disorders in dogs. Unfortunately, up to 30% of dogs with idiopathic epilepsy show no improvement under antiepileptic drug treatment. Diffusion-weighted imaging is used in human medicine to identify epileptogenic foci in the brain to allow for more invasive treatments such as deep brain stimulation or surgical removal. The aim of this study was to ass the feasibility of interictal diffusion-weighted MRI in dogs and to evaluate the distribution of diffusion in the brains of dogs with idiopathic epilepsy (IE) and to compare these values to previously published values from healthy beagle dogs...
November 15, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29141511/a-multimodal-mri-study-of-recovery-of-consciousness-in-severe-traumatic-brain-injury-preliminary-results
#18
Ang Yang, Xue Hong Xiao, Zhong Hua Liu, Zhi Long Wan, Ze Yan Wang
Accurate and reliable assessment of the conscious state of patients with severe TBI is vital for their future management. The purpose of the present study is to find an effective and accurate magnetic resonance imaging (MRI) method for predicting recovery of consciousness in patients with severe traumatic brain injury (TBI). Multimodal MR techniques, including structural MRI, magnetic resonance spectroscopy (MRS), diffusion tensor imaging (DTI), were used to evaluate brain damage in 58 patients with severe TBI...
November 15, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29140952/-don-t-lose-hope-early-hemorrhagic-diffuse-axonal-injury-on-head-ct-is-not-associated-with-poor-outcome-in-moderate-severe-tbi-patients
#19
Nils Henninger, Rebecca A Compton, Muhammad W Khan, Raphael Carandang, Wiley Hall, Susanne Muehlschlegel
BACKGROUND: Diffuse axonal injury (DAI) on MRI has been associated with poor functional outcome after moderate-severe traumatic brain injury (msTBI). Yet, DAI assessment with highly-sensitive MRI-techniques is unfeasible in the acute trauma setting, and CT remains the key diagnostic modality despite its lower sensitivity. We sought to determine whether CT-defined-hemorrhagic-DAI (hDAI) is associated with discharge and favorable 3-and 12-month functional outcome (Glasgow Outcome Score ≥4) after msTBI...
November 14, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29140815/neuroimaging-diagnostic-and-monitoring-approaches-in-ophthalmology
#20
Bart K Chwalisz, Marc A Bouffard, Sashank Prasad, Dean M Cestari
PURPOSE OF REVIEW: We review new applications of optical coherence tomography (OCT) technology in neuro-ophthalmology. We also describe new technologies for visualizing the extracranial vessels in the diagnosis of giant cell arteritis (GCA). RECENT FINDINGS: Newer OCT modalities are expanding the evaluation of the optic disc, and are being applied to a number of neurologic conditions such as demyelinating and neurodegenerative disease. Swept-source OCT and enhanced-depth imaging OCT are refining the fine-grained analysis of the optic nerve head in the diagnosis of papilledema and optic nerve drusen...
November 14, 2017: Current Opinion in Neurology
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