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Low field MRI

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https://www.readbyqxmd.com/read/27908173/pacemaker-and-icd-oversensing-induced-by-movements-near-the-mri-scanner-bore
#1
E Mattei, F Censi, G Calcagnini, R Falsaperla, E Genovese, A Napolitano, V Cannatà
PURPOSE: The effect of the movement near the MRI scanner bore for people with a pacemaker (PM) or an implantable cardioverter defibrillator (ICD) is experimentally evaluated and discussed. METHODS: The authors performed in vitro measurements on a saline-filled human-shaped phantom (male, 170 cm height), equipped first with an MR-conditional PM (bicameral configuration, DDD programming), then with an MR-conditional ICD (biventricular configuration, detection algorithms enable but shock delivery disable)...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27889653/remote-detected-low-field-mri-using-an-optically-pumped-atomic-magnetometer-combined-with-a-liquid-cooled-pre-polarization-coil
#2
Ingo Hilschenz, Yosuke Ito, Hiroaki Natsukawa, Takenori Oida, Tetsuya Yamamoto, Tetsuo Kobayashi
Superconducting quantum interference devices are widely used in basic and clinical biomagnetic measurements such as low-field magnetic resonance imaging and magnetoencephalography primarily because they exhibit high sensitivity at low frequencies and have a wide bandwidth. The main disadvantage of these devices is that they require cryogenic coolants, which are rather expensive and not easily available. Meanwhile, with the advances in laser technology in the past few years, optically pumped atomic magnetometers (OPAMs) have been shown to be a good alternative as they can have adequate noise levels and are several millimeters in size, which makes them significantly easier to use...
November 18, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/27885957/visual-pathway-impairment-by-pituitary-adenomas-quantitative-diagnostics-by-diffusion-tensor-imaging
#3
Ylva Lilja, Oscar Gustafsson, Maria Ljungberg, Göran Starck, Bertil Lindblom, Thomas Skoglund, Henrik Bergquist, Karl-Erik Jakobsson, Daniel Nilsson
OBJECTIVE Despite ample experience in surgical treatment of pituitary adenomas, little is known about objective indices that may reveal risk of visual impairment caused by tumor growth that leads to compression of the anterior visual pathways. This study aimed to explore diffusion tensor imaging (DTI) as a means for objective assessment of injury to the anterior visual pathways caused by pituitary adenomas. METHODS Twenty-three patients with pituitary adenomas, scheduled for transsphenoidal tumor resection, and 20 healthy control subjects were included in the study...
November 25, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27885289/assessment-of-knee-joint-injuries-with-low-field-strength-magnetic-resonance-imaging
#4
O B Panta, N P Neupane, S Songmen, G Gurung
BACKGROUND: Magnetic Resonance Imaging is an appropriate screening tool before therapeutic arthroscopy, making diagnostic arthroscopy unnecessary in most patients. This study aims to evaluate the MRI findings in knee injuries and diagnostic value of low Strength MRI for assessing Meniscal and cruciate ligament tear. METHODS: A cross sectional study was conducted on patients undergoing "Magnetic Resonance Imaging of the Knee" for injuries of the knee and excluded patients undergoing MRI for other causes, poor diagnostic quality MRI and post operative MRI...
May 2016: Journal of Nepal Health Research Council
https://www.readbyqxmd.com/read/27882770/focal-therapy-as-primary-treatment-for-localized-prostate-cancer-definition-needs-and-future
#5
Adil Ouzzane, Nacim Betrouni, Massimo Valerio, Ardeshir Rastinehad, Pierre Colin, Guillaume Ploussard
Focal therapy (FT) may offer a promising treatment option in the field of low to intermediate risk localized prostate cancer. The aim of this concept is to combine minimal morbidity with cancer control as well as maintain the possibility of retreatment. Recent advances in MRI and targeted biopsy has improved the diagnostic pathway of prostate cancer and increased the interest in FT. However, before implementation of FT in routine clinical practice, several challenges are still to overcome including patient selection, treatment planning, post-therapy monitoring and definition of oncologic outcome surrogates...
November 24, 2016: Future Oncology
https://www.readbyqxmd.com/read/27863444/av-1451-tau-and-%C3%AE-amyloid-pet-imaging-in-dementia-with-lewy-bodies
#6
Kejal Kantarci, Val J Lowe, Bradley F Boeve, Matthew L Senjem, Nikki Tosakulwong, Timothy G Lesnick, Anthony J Spychalla, Jeffrey L Gunter, Julie A Fields, Jonathan Graff-Radford, Tanis J Ferman, David T Jones, Melissa E Murray, David S Knopman, Clifford R Jack, Ronald C Petersen
OBJECTIVE: Patients with probable dementia with Lewy bodies often have Alzheimer's disease-related pathology. Our objective was to determine the pattern of positron emission tomography tau tracer AV-1451 uptake in patients with probable dementia with Lewy bodies, compared to Alzheimer's disease, and its relationship to β-amyloid deposition on positron emission tomography. METHODS: Consecutive patients with clinically probable dementia with Lewy bodies (n=19) from the Mayo Clinic Alzheimer's Disease Research Center underwent MRI, AV-1451 and Pittsburgh compound-B positron emission tomography examinations...
November 18, 2016: Annals of Neurology
https://www.readbyqxmd.com/read/27860072/magnetic-resonance-imaging-gross-postmortem-and-histological-findings-for-soft-tissues-of-the-plantar-aspect-of-the-tarsus-and-proximal-metatarsal-region-in-non-lame-horses
#7
Sue Dyson, Anthony Blunden, Rachel Murray
Injuries of the plantar soft tissues of the tarsus and proximal metatarsus can be a source of lameness in horses, however published information is lacking on high field MRI characteristics of these tissues. Objectives of the current anatomic study were to (1) describe high-field MRI features of the plantar tarsal and proximal metatarsal soft tissues; and (2) compare MRI findings with gross and histological appearances of selected structures for a sample of cadaver limbs from non-lame horses. Single hindlimbs for 42 horses, and right and left hindlimbs for eight horses were scanned using high-field MRI...
November 13, 2016: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/27853587/magnetic-resonance-and-ultrasound-contrast-imaging-of-polymer-shelled-microbubbles-loaded-with-iron-oxide-nanoparticles
#8
Claudia Sciallero, Luca Balbi, Gaio Paradossi, Andrea Trucco
Dual-mode contrast agents (CAs) have great potential for improving diagnostics. However, the effectiveness of CAs is strictly related to both the solution adopted to merge the two agents into a single probe unit, and the ratio between the two agents. In this study, two dual-mode CAs for simultaneous magnetic resonance imaging (MRI) and ultrasound imaging (UI) were assessed. For this purpose, different densities of superparamagnetic iron oxide nanoparticles (SPIONs) were anchored to the external surface of polymer-shelled microbubbles (MBs) or were physically entrapped into the shell...
August 2016: Royal Society Open Science
https://www.readbyqxmd.com/read/27831868/an-efficient-methodology-for-the-analysis-of-dielectric-shimming-materials-in-magnetic-resonance-imaging
#9
Jeroen van Gemert, Wyger Brink, Andrew Webb, Rob Remis
Interference effects in the transmit B+ 1 field can severely degrade the image quality in high-field Magnetic Resonance Imaging (MRI). High-permittivity pads are increasingly used to counteract these effects, but designing such pads is not trivial. In this paper, we present an efficient solution methodology for this dielectric RF shimming problem. By exploiting the fact that dielectric pads form a low rank perturbation of a largescale background model, we are able to efficiently compute B+ 1 fields that correspond to a wide range of different pad realizations...
November 2, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/27827800/quantification-of-cerebral-lateral-ventricular-volume-in-cats-by-low-and-high-field-mri
#10
Paulina Przyborowska, Zbigniew Adamiak, Yauheni Zhalniarovich
OBJECTIVES: The aim of this study was to evaluate variations in lateral ventricles in the examined feline population with the use of quantitative analysis methods to determine whether sex or body weight influenced the size of the ventricles, and to identify any significant differences in the results of low- and high-field MRI. METHODS: Twenty healthy European Shorthair cats, aged 1-3 years, with body weight of 2.85-4.35 kg, were studied. MRI of brain structures was performed in a low- and a high-field MRI system...
November 8, 2016: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/27824544/radionuclide-methods-in-the-diagnosis-of-sacroiliitis-in-patients-with-spondyloarthritis-an-update
#11
REVIEW
Karina Zilber, Miguel Gorenberg, Doron Rimar, Nina Boulman, Lisa Kaly, Michael Rozenbaum, Itzhak Rosner, Gleb Slobodin
Sacroiliitis, inflammation of the sacroiliac joint (SIJ), is the hallmark of ankylosing spondylitis and spondyloarthritis (SpA) in general. The arsenal of recommended diagnostic modalities for imaging of the SIJ is scanty and, in practice, includes only conventional X-rays and magnetic resonance imaging (MRI). This review suggests that bone scintigraphy, particularly single-photon emission computed tomography (SPECT) with calculation of indices, or SPECT in combination with low-dose computed tomography (CT) can be a sensitive and specific tool for the diagnosis of sacroiliitis and can be used as part of the individualized approach to the diagnosis of axial SpA...
October 31, 2016: Rambam Maimonides Medical Journal
https://www.readbyqxmd.com/read/27818597/comparison-of-magnetic-resonance-spectroscopy-proton-density-fat-fraction-and-histological-analysis-in-the-quantification-of-liver-steatosis-in-children-and-adolescents
#12
Michele Di Martino, Lucia Pacifico, Mario Bezzi, Rossella Di Miscio, Beatrice Sacconi, Claudio Chiesa, Carlo Catalano
AIM: To establish a threshold value for liver fat content between healthy children and those with non-alcoholic fatty liver disease (NAFLD) by using magnetic resonance imaging (MRI), with liver biopsy serving as a reference standard. METHODS: The study was approved by the local ethics committee, and written informed consent was obtained from all participants and their legal guardians before the study began. Twenty-seven children with NAFLD underwent liver biopsy to assess the presence of nonalcoholic steatohepatitis...
October 21, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27809808/planning-ttfields-treatment-using-the-novotal-system-clinical-case-series-beyond-the-use-of-mri-contrast-enhancement
#13
Jennifer Connelly, Adília Hormigo, Nimish Mohilie, Jethro Hu, Aafia Chaudhry, Nicholas Blondin
BACKGROUND: Gliomas are the most common primary brain tumors in adults and invariably carry a poor prognosis. Recent clinical studies have demonstrated the safety and compelling survival benefit when tumor treating fields (TTFields) are added to temozolomide for patients with newly diagnosed glioblastoma. TTFields are low-intensity, intermediate frequency (200 kHz) alternating electric fields, delivered directly to a patient's brain through the local application of non-invasive transducer arrays...
November 4, 2016: BMC Cancer
https://www.readbyqxmd.com/read/27803067/large-scale-radiomic-profiling-of-recurrent-glioblastoma-identifies-an-imaging-predictor-for-stratifying-anti-angiogenic-treatment-response
#14
Philipp Kickingereder, Michael Götz, John Muschelli, Antje Wick, Ulf Neuberger, Russell T Shinohara, Martin Sill, Martha Nowosielski, Heinz-Peter Schlemmer, Alexander Radbruch, Wolfgang Wick, Martin Bendszus, Klaus H Maier-Hein, David Bonekamp
PURPOSE: Antiangiogenic treatment with bevacizumab, a mAb to the VEGF, is the single most widely used therapeutic agent for patients with recurrent glioblastoma. A major challenge is that there are currently no validated biomarkers that can predict treatment outcome. Here we analyze the potential of radiomics, an emerging field of research that aims to utilize the full potential of medical imaging. EXPERIMENTAL DESIGN: A total of 4,842 quantitative MRI features were automatically extracted and analyzed from the multiparametric tumor of 172 patients (allocated to a discovery and validation set with a 2:1 ratio) with recurrent glioblastoma prior to bevacizumab treatment...
December 1, 2016: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/27799506/personalized-treatment-for-a-patient-with-a-braf-v600e-mutation-using-dabrafenib-and-a-tumor-treatment-fields-device-in-a-high-grade-glioma-arising-from-ganglioglioma
#15
Silviya K Meletath, Dean Pavlick, Tim Brennan, Roy Hamilton, Juliann Chmielecki, Julia A Elvin, Norma Palma, Jeffrey S Ross, Vincent A Miller, Philip J Stephens, George Snipes, Veena Rajaram, Siraj M Ali, Isaac Melguizo-Gavilanes
BACKGROUND: Gangliogliomas are slow-growing, low-grade central nervous system tumors affecting children and young adults. However, some patients will experience tumor recurrence and/or malignant progression. This article reports on the clinical history, molecular findings, and treatment response in a patient with BRAF V600-mutated high-grade glioma arising from ganglioglioma. METHODS: Hematoxylin-eosin staining and comprehensive genomic profiling via Foundation One were performed on the tumor sample from a male patient undergoing treatment at the Department of Neuro-Oncology at Baylor University Medical Center...
November 2016: Journal of the National Comprehensive Cancer Network: JNCCN
https://www.readbyqxmd.com/read/27798979/role-of-radiological-parameters-in-predicting-overall-shunt-outcome-after-ventriculoperitoneal-shunt-insertion-in-pediatric-patients-with-obstructive-hydrocephalus
#16
Devi Prasad Patra, Shyamal C Bir, Tanmoy K Maiti, Piyush Kalakoti, Hugo Cuellar, Bharat Guthikonda, Hai Sun, Christina Notarianni, Anil Nanda
OBJECTIVE Despite significant advances in the medical field and shunt technology, shunt malfunction remains a nightmare of pediatric neurosurgeons. In this setting, the ability to preoperatively predict the probability of shunt malfunction is quite compelling. The authors have compared the preoperative radiological findings in obstructive hydrocephalus and the subsequent clinical course of the patient to determine any association with overall shunt outcome. METHODS This retrospective study included all pediatric patients (age < 18 years) who had undergone ventriculoperitoneal shunt insertion for obstructive hydrocephalus...
November 2016: Neurosurgical Focus
https://www.readbyqxmd.com/read/27791707/intraoperative-magnetic-resonance-imaging-in-pediatric-neurosurgery-safety-and-utility
#17
Mario Giordano, Amir Samii, Anna C Lawson McLean, Helmut Bertalanffy, Rudolf Fahlbusch, Madjid Samii, Concezio Di Rocco
OBJECTIVE The use of high-field intraoperative MRI has been largely studied for the treatment of intracranial tumors in adult patients. In this study, the authors investigated the safety, advantages, and limitations of high-field iMRI for cranial neurosurgical procedures in pediatric patients, with particular attention to craniopharyngiomas and gliomas. METHODS The authors performed 82 surgical procedures in patients under 16 years of age (range 0.8-15 years) over an 8-year period (2007-2014) using iMRI. The population was divided into 3 groups based on the condition treated: sellar region tumors (Group 1), gliomas (Group 2), and other pathological entities (Group 3)...
October 28, 2016: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/27790754/advancing-rf-pulse-design-using-an-open-competition-format-report-from-the-2015-ismrm-challenge
#18
William A Grissom, Kawin Setsompop, Samuel A Hurley, Jeffrey Tsao, Julia V Velikina, Alexey A Samsonov
PURPOSE: To advance the best solutions to two important RF pulse design problems with an open head-to-head competition. METHODS: Two sub-challenges were formulated in which contestants competed to design the shortest simultaneous multislice (SMS) refocusing pulses and slice-selective parallel transmission (pTx) excitation pulses, subject to realistic hardware and safety constraints. Short refocusing pulses are needed for spin echo SMS imaging at high multiband factors, and short slice-selective pTx pulses are needed for multislice imaging in ultra-high field MRI...
October 27, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27787911/accelerating-4d-flow-mri-by-exploiting-low-rank-matrix-structure-and-hadamard-sparsity
#19
Giuseppe Valvano, Nicola Martini, Adrian Huber, Claudio Santelli, Christian Binter, Dante Chiappino, Luigi Landini, Sebastian Kozerke
PURPOSE: To develop accelerated 4D flow MRI by exploiting low-rank matrix structure and Hadamard sparsity. THEORY AND METHODS: 4D flow MRI data can be represented as the sum of a low-rank and a sparse component. To optimize the sparse representation of the data, it is proposed to incorporate a Hadamard transform of the velocity-encoding segments. Retrospectively and prospectively, undersampled data of the aorta of healthy subjects are used to assess the reconstruction accuracy of the proposed method relative to k-t SPARSE-SENSE reconstruction...
October 27, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27779126/mr-compatibility-of-a-high-resolution-small-animal-pet-insert-operating-inside-a-7-t-mri
#20
J D Thiessen, E Shams, G Stortz, G Schellenberg, D Bishop, M S Khan, P Kozlowski, F Retière, V Sossi, C J Thompson, A L Goertzen
A full-ring PET insert consisting of 16 PET detector modules was designed and constructed to fit within the 114 mm diameter gradient bore of a Bruker 7 T MRI. The individual detector modules contain two silicon photomultiplier (SiPM) arrays, dual-layer offset LYSO crystal arrays, and high-definition multimedia interface (HDMI) cables for both signal and power transmission. Several different RF shielding configurations were assessed prior to construction of a fully assembled PET insert using a combination of carbon fibre and copper foil for RF shielding...
November 21, 2016: Physics in Medicine and Biology
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