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https://www.readbyqxmd.com/read/28092848/the-initial-use-of-arterial-spin-labeling-perfusion-and-diffusion-weighted-magnetic-resonance-images-in-the-diagnosis-of-nonconvulsive-partial-status-epileptics
#1
Takafumi Shimogawa, Takato Morioka, Tetsuro Sayama, Sei Haga, Yuka Kanazawa, Kei Murao, Shuji Arakawa, Ayumi Sakata, Koji Iihara
BACKGROUND: In the diagnosis of nonconvulsive status epilepticus (NCSE), capture of ongoing ictal electroencephalographic (EEG) findings is the gold standard; however, this is practically difficult without continuous EEG monitoring facilities. Magnetic resonance imaging (MRI), including diffusion-weighted imaging (DWI) and perfusion MRI with arterial spin labeling (ASL), have been applied mainly in emergency situations. Recent reports have described that ictal MRI findings, including ictal hyperperfusion on ASL and cortical hyperintensity of cytotoxic edema on DWI, can be obtained from epileptically activated cortex...
December 21, 2016: Epilepsy Research
https://www.readbyqxmd.com/read/28092638/mr-elastography-to-measure-the-effects-of-cancer-and-pathology-fixation-on-prostate-biomechanics-and-comparison-with-t-1-t-2-and-adc
#2
Deirdre M McGrath, Jenny Lee, Warren D Foltz, Navid Samavati, Theo van der Kwast, Michael A S Jewett, Peter Chung, Cynthia Ménard, Kristy K Brock
MRI is under evaluation for image-guided intervention for prostate cancer. The sensitivity and specificity of MRI parameters is determined via correlation with the gold-standard of histopathology. Whole-mount histopathology of prostatectomy specimens can be digitally registered to in vivo imaging for correlation. When biomechanical-based deformable registration is employed to account for deformation during histopathology processing, the ex vivo biomechanical properties are required. However, these properties are altered by pathology fixation, and vary with disease...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28092530/feasibility-of-multi-plane-transmit-beamforming-for-real-time-volumetric-cardiac-imaging-a-simulation-study
#3
Yinran Chen, Ling Tong, Alejandra Ortega, Jianwen Luo, Jan D'hooge
Today's three-dimensional (3-D) cardiac ultrasound imaging systems suffer from relatively low spatial and temporal resolution, limiting their applicability in daily clinical practice. To address this problem, 3-D diverging wave imaging with spatial coherent compounding (DWC) as well as 3-D multi-line-transmit (MLT) imaging have recently been proposed. Currently, the former improves the temporal resolution significantly at the expense of image quality and the risk of introducing motion artifacts whereas the latter only provides a moderate gain in volume rate but mostly preserves quality...
January 10, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28092527/block-matching-distortion-correction-of-echo-planar-images-with-opposite-phase-encoding-directions
#4
Renaud Hedouin, Olivier Commowick, Elise Bannier, Benoit Scherrer, Maxime Taquet, Simon Warfield, Christian Barillot
By shortening the acquisition time of MRI, Echo Planar Imaging (EPI) enables the acqui- sition of a large number of images in a short time, com- patible with clinical constraints as required for diffusion or functional MRI. However such images are subject to large, local distortions disrupting their correspondence with the underlying anatomy. The correction of those distortions is an open problem, especially in regions where large deformations occur. We propose a new block-matching registration method to perform EPI distortion correction based on the acquisition of two EPI with opposite phase encoding directions (PED)...
January 9, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28092344/choriocapillaris-signal-voids-in-maternally-inherited-diabetes-and-deafness-and-in-pseudoxanthoma-elasticum
#5
Richard F Spaide
PURPOSE: To evaluate the pattern of choriocapillaris signal voids in maternally inherited diabetes and deafness and in pseudoxanthoma elasticum in eyes before the development of any geographic atrophy. METHODS: The choriocapillaris under the central macula was imaged with the Optovue RTVue XR Avanti using a 10 μm slab thickness. Automatic local thresholding of the resultant raw data extracted areas of absent flow signal, called signal voids, and these were counted and logarithmically binned...
January 13, 2017: Retina
https://www.readbyqxmd.com/read/28092341/unilateral-spinous-process-non-covering-hook-type-patient-specific-drill-template-for-thoracic-pedicle-screw-fixation-a-pilot-clinical-trial-and-template-classification
#6
Sang Bum Kim, Yougun Won, Hyun Jin Yoo, Lee Jae Sin, John M Rhee, Sang Wook Lee, Gi-Soo Lee
STUDY DESIGN: Prospective Clinical Pilot tudy OBJECTIVE.: To confirm the accuracy of thoracic pedicle screw placement by using the unilateral spinous non-covering hook type patient-specific drill template (PSDT) made through rapid prototyping (RP) and to analyze previously reported PSDT designs and their characteristics. SUMMARY OF BACKGROUND DATA: Pedicle screw fixation is the most common form of the posterior instrumentation of the thoracic and lumbar spine. Various techniques have been introduced to improve pedicle screw placement...
January 13, 2017: Spine
https://www.readbyqxmd.com/read/28092321/dexmedetomidine-disrupts-the-local-and-global-efficiencies-of-large-scale-brain-networks
#7
Javeria A Hashmi, Marco L Loggia, Sheraz Khan, Lei Gao, Jieun Kim, Vitaly Napadow, Emery N Brown, Oluwaseun Akeju
BACKGROUND: A clear understanding of the neural basis of consciousness is fundamental to research in clinical and basic neuroscience disciplines and anesthesia. Recently, decreased efficiency of information integration was suggested as a core network feature of propofol-induced unconsciousness. However, it is unclear whether this finding can be generalized to dexmedetomidine, which has a different molecular target. METHODS: Dexmedetomidine was administered as a 1-μg/kg bolus over 10 min, followed by a 0...
January 16, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28092257/-chilaiditi-s-sign-and-syndrome-case-report
#8
César Raúl Aguilar-García, Jesús García-Acosta
The interposition of a portion of the colon between the liver and the diaphragm is called Chilaiditi sign and discovered incidentally during radiological study for other reasons and usually asymptomatic presentation. When the discovery is accompanied by clinical symptoms such as abdominal pain, nausea, vomiting, bloating, constipation called Chilaiditi Syndrome. The Chilaiditi sign is a very rare condition, and the Chilaiditi syndrome is even more, especially if associated with other acute diseases. We report the case of a man of 41 years was admitted with right upper quadrant abdominal pain, nausea, vomiting, difficulty was diagnosed with radiographic and tomographic images making the differential diagnosis with lung abscess and diaphragmatic hernia...
January 2017: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/28092203/machine-learning-of-three-dimensional-right-ventricular-motion-enables-outcome-prediction-in-pulmonary-hypertension-a-cardiac-mr-imaging-study
#9
Timothy J W Dawes, Antonio de Marvao, Wenzhe Shi, Tristan Fletcher, Geoffrey M J Watson, John Wharton, Christopher J Rhodes, Luke S G E Howard, J Simon R Gibbs, Daniel Rueckert, Stuart A Cook, Martin R Wilkins, Declan P O'Regan
Purpose To determine if patient survival and mechanisms of right ventricular failure in pulmonary hypertension could be predicted by using supervised machine learning of three-dimensional patterns of systolic cardiac motion. Materials and Methods The study was approved by a research ethics committee, and participants gave written informed consent. Two hundred fifty-six patients (143 women; mean age ± standard deviation, 63 years ± 17) with newly diagnosed pulmonary hypertension underwent cardiac magnetic resonance (MR) imaging, right-sided heart catheterization, and 6-minute walk testing with a median follow-up of 4...
January 16, 2017: Radiology
https://www.readbyqxmd.com/read/28092120/pediatric-peritonsillar-abscess-outcomes-and-cost-savings-from-using-transcervical-ultrasound
#10
Zhen Huang, William Vintzileos, Heather Gordish-Dressman, Anjum Bandarkar, Brian K Reilly
OBJECTIVES: 1) To analyze clinical outcomes of children stratified by ultrasound into three diagnoses: acute tonsillitis, peritonsillar phlegmon, and abscess; and 2) To compare clinical outcomes and financial impact between children who underwent ultrasound protocol to those who did not. STUDY DESIGN: Retrospective analysis between two cohorts: ultrasound protocol group and control group. METHODS: Children with peritonsillar abscess (PTA) diagnosed in the emergency department (ED) were enrolled during a 2-year period for transcervical ultrasound evaluation of bilateral tonsillar fossae...
January 16, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28091966/aortic-regurgitation-generates-a-kinematic-obstruction-which-hinders-left-ventricular-filling
#11
Ikechukwu Okafor, Vrishank Raghav, Jose F Condado, Prem A Midha, Gautam Kumar, Ajit P Yoganathan
An incompetent aortic valve (AV) results in aortic regurgitation (AR), where retrograde flow of blood into the left ventricle (LV) is observed. In this work, we parametrically characterized the detailed changes in intra-ventricular flow during diastole as a result of AR in a physiological in vitro left-heart simulator (LHS). The loss of energy within the LV as the level of AR increased was also assessed. The validated LHS consisted of an optically-clear, flexible wall LV and a modular AV holder. Two-component, planar, digital particle image velocimetry was used to visualize and quantify intra-ventricular flow...
January 13, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28091957/point-spread-function-reconstructed-pet-images-of-sub-centimeter-lesions-are-not-quantitative
#12
O L Munk, L P Tolbod, S B Hansen, T V Bogsrud
BACKGROUND: PET image reconstruction methods include modeling of resolution degrading phenomena, often referred to as point-spread function (PSF) reconstruction. The aim of this study was to develop a clinically relevant phantom and characterize the reproducibility and accuracy of high-resolution PSF reconstructed images of small lesions, which is a prerequisite for using PET in the prediction and evaluation of responses to treatment. Sets of small homogeneous (18)F-spheres (range 3-12 mm diameter, relevant for small lesions and lymph nodes) were suspended and covered by a (11)C-silicone, which provided a scattering medium and a varying sphere-to-background ratio...
December 2017: EJNMMI Physics
https://www.readbyqxmd.com/read/28091938/distinguishing-features-of-acute-vogt-koyanagi-harada-disease-and-acute-central-serous-chorioretinopathy-on-optical-coherence-tomography-angiography-and-en-face-optical-coherence-tomography-imaging
#13
Kanika Aggarwal, Aniruddha Agarwal, Ankit Deokar, Sarakshi Mahajan, Ramandeep Singh, Reema Bansal, Aman Sharma, Mangat R Dogra, Vishali Gupta
BACKGROUND: The aim of this study is to determine the differences in optical coherence tomography angiography (OCTA) features of acute Vogt-Koyanagi-Harada disease (VKH) and acute central serous chorioretinopathy (CSC). Clinical and imaging data of patients with acute CSC and VKH in a tertiary-care institute were analyzed. Multimodal imaging including fluorescein angiography, indocyanine green angiography (ICGA), and enhanced-depth imaging OCT were performed. OCTA images were analyzed for alterations in retinochoroidal microvasculature...
December 2017: Journal of Ophthalmic Inflammation and Infection
https://www.readbyqxmd.com/read/28091891/adrenal-teratoma-a-case-series-and-review-of-the-literature
#14
Eric J Kuo, Anthony E Sisk, Zhiming Yang, Jiaoti Huang, Michael W Yeh, Masha J Livhits
Adrenal teratomas are rare neoplasms and there is limited data on their surgical outcomes and long-term prognosis. We aimed to review our institutional experience and compare this to the existing literature on adrenal teratomas in adults and children. An institutional pathology database was searched for cases of adrenal teratoma (June 1956-July 2016). Clinical and imaging data were abstracted from the medical records and pathology slides were obtained for review. In addition, a PubMed search for "adrenal teratoma" from June 1952 to July 2016 was performed to identify reports of primary adrenal teratoma in patients of all ages...
January 14, 2017: Endocrine Pathology
https://www.readbyqxmd.com/read/28091819/the-status-of-diagnosis-and-treatment-to-intracranial-hypotension-including-sih
#15
REVIEW
Jin-Ping Lin, Shu-Dong Zhang, Fei-Fang He, Min-Jun Liu, Xiao-Xu Ma
Intracranial hypotension, especially spontaneous intracranial hypotension (SIH), is a well-recognized entity associated with cerebrospinal fluid (CSF) leaks, and has being recognized better in resent years, while still woefully inadequate. An increasing number of factors including iatrogenic factors are realized to involve in development and progression of intracranial hypotension. The diagnosis remains difficult due to the various clinical manifestations, some of which are nonspecific and easily to be neglected...
December 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/28091817/teratomas-of-the-cranial-vault-a-systematic-analysis-of-clinical-outcomes-stratified-by-histopathological-subtypes
#16
Carlito Lagman, Timothy T Bui, Brittany L Voth, Lawrance K Chung, David J Seo, Courtney Duong, Mark R Libowitz, Naomi E Walker, Daniel T Nagasawa, Isaac Yang
BACKGROUND: Teratomas of the cranial vault are divided into histopathological subtypes and grouped by prognoses: mature (good prognosis), mixed/malignant and immature teratomas (intermediate prognosis). This schema also includes non-teratomatous tumors. The authors of this study sought to elucidate histologically dependent predictors of survival and further clarify the classification system of intracranial teratomas. METHODS: We performed a systematic analysis of the published literature to identify studies describing patients with intracranial teratomas diagnosed with magnetic resonance imaging (MRI) and presenting definite information on histologies, therapies, and outcomes at a minimum follow-up of 2 years...
January 14, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28091816/pediatric-cerebral-sinovenous-thrombosis-following-cranial-surgery
#17
Dmitriy Petrov, Michael Y Uohara, Rebecca Ichord, Zarina Ali, Laura Jastrzab, Shih-Shan Lang, Lori Billinghurst
PURPOSE: Pediatric cerebral sinovenous thrombosis (CSVT) is an important, though less common subtype of pediatric stroke. It has been linked to several risk factors, including cranial procedures, with few studies highlighting this relationship. The aim of this study was to characterize the diagnosis and treatment of CSVT after cranial surgery. METHODS: An institutional pediatric stroke research database was used to identify all CSVT cases diagnosed within 30 days of cranial surgery from November 2004 to December 2014...
January 14, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28091809/a-review-of-penetrating-brain-trauma-epidemiology-pathophysiology-imaging-assessment-complications-and-treatment
#18
REVIEW
Mona T Vakil, Ajay K Singh
Gunshot injuries are the most common cause of penetrating brain injury (PBI) and carry a high morbidity and mortality. The incidence of PBI has increased over the last decade with an estimated 35,000 civilian deaths annually. Patients that survive to reach the hospital require rapid triage and imaging evaluation. CT findings in conjunction with the Glasgow Coma Scale are typically used to determine which patients are surgical candidates. Radiologists should be familiar with the various injury patterns and imaging findings which are poor prognostic indicators, notably brainstem, bilateral hemispheric, multilobar, or transventricular injuries...
January 14, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28091744/prediction-of-pancreatic-fistula-after-distal-pancreatectomy-based-on-cross-sectional-images
#19
Ye Rim Chang, Jae Seung Kang, Jin-Young Jang, Woo Hyun Jung, Mee Joo Kang, Kyung Bun Lee, Sun-Whe Kim
BACKGROUND: Postoperative pancreatic fistula (POPF) is one of the most common and clinically relevant complications after distal pancreatectomy (DP), occurring in 5-40% of patients. Determining risk factors for this complication may aid in its prevention. This study sought to predict the development of POPF after DP preoperatively and objectively based on radiologic findings. METHODS: This study included 60 patients who underwent DP using a stapler for pancreatic division between June 2011 and January 2013...
January 13, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28091699/musculoskeletal-mri-findings-of-juvenile-localized-scleroderma
#20
Eric P Eutsler, Daniel B Horton, Monica Epelman, Terri Finkel, Lauren W Averill
BACKGROUND: Juvenile localized scleroderma comprises a group of autoimmune conditions often characterized clinically by an area of skin hardening. In addition to superficial changes in the skin and subcutaneous tissues, juvenile localized scleroderma may involve the deep soft tissues, bones and joints, possibly resulting in functional impairment and pain in addition to cosmetic changes. OBJECTIVE: There is literature documenting the spectrum of findings for deep involvement of localized scleroderma (fascia, muscles, tendons, bones and joints) in adults, but there is limited literature for the condition in children...
January 14, 2017: Pediatric Radiology
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