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Phase contrast Magnetic

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https://www.readbyqxmd.com/read/28212047/multimaterial-decomposition-algorithm-for-the-quantification-of-liver-fat-content-by-using-fast-kilovolt-peak-switching-dual-energy-ct-clinical-evaluation
#1
Tomoko Hyodo, Norihisa Yada, Masatoshi Hori, Osamu Maenishi, Peter Lamb, Kosuke Sasaki, Minori Onoda, Masatoshi Kudo, Teruhito Mochizuki, Takamichi Murakami
Purpose To assess the clinical accuracy and reproducibility of liver fat quantification with the multimaterial decomposition (MMD) algorithm, comparing the performance of MMD with that of magnetic resonance (MR) spectroscopy by using liver biopsy as the reference standard. Materials and Methods This prospective study was approved by the institutional ethics committee, and patients provided written informed consent. Thirty-three patients suspected of having hepatic steatosis underwent non-contrast material-enhanced and triple-phase dynamic contrast-enhanced dual-energy computed tomography (CT) (80 and 140 kVp) and single-voxel proton MR spectroscopy within 30 days before liver biopsy...
February 17, 2017: Radiology
https://www.readbyqxmd.com/read/28210495/reproducibility-of-pulmonary-blood-flow-measurements-by-phase-contrast-mri-using-different-1-5-t-mr-scanners-at-two-institutions
#2
Rin Iraha, Nanae Tsuchiya, Tsuneo Yamashiro, Tae Iwasawa, Sadayuki Murayama
BACKGROUND: Magnetic resonance imaging (MRI) can be beneficial for diagnosis of disease by offering quantitative information. However, reproducibility can be a major problem when there is a numerical threshold in multi-institution, multi-vendor situations. PURPOSE: To measure pulmonary blood flow with phase-contrast (PC) imaging using two different MR scanners (1.5 T) at different institutions in the same participants and to examine the reproducibility of the measurements...
January 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/28209559/irreversible-electroporation-for-the-ablation-of-renal-cell-carcinoma-a-prospective-human-in-vivo-study-protocol-ideal-phase-2b
#3
Mara Buijs, Krijn P van Lienden, Peter Gk Wagstaff, Matthijs Jv Scheltema, Daniel M de Bruin, Patricia J Zondervan, Otto M van Delden, Ton G van Leeuwen, Jean Jmch de la Rosette, M Pilar Laguna
BACKGROUND: Irreversible electroporation (IRE) is an emerging technique delivering electrical pulses to ablate tissue, with the theoretical advantage to overcome the main shortcomings of conventional thermal ablation. Recent short-term research showed that IRE for the ablation of renal masses is a safe and feasible treatment option. In an ablate and resect design, histopathological analysis 4 weeks after radical nephrectomy demonstrated that IRE-targeted renal tumors were completely covered by ablation zone...
February 16, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28206771/magnetic-particle-imaging-a-novel-in-vivo-imaging-platform-for-cancer-detection
#4
Elaine Y Yu, Mindy Bishop, Bo Zheng, R Matthew Ferguson, Amit P Khandhar, Scott J Kemp, Kannan M Krishnan, Patrick W Goodwill, Steven M Conolly
Cancer remains one of the leading causes of death worldwide. Biomedical imaging plays a crucial role in all phases of cancer management. Physicians often need to choose the ideal diagnostic imaging modality for each clinical presentation based on complex trade-offs between spatial resolution, sensitivity, contrast, access, cost, and safety. Magnetic particle imaging (MPI) is an emerging tracer imaging modality that detects superparamagnetic iron oxide (SPIO) nanoparticle tracer with high image contrast (zero tissue background signal), high sensitivity (200 nM Fe) with linear quantitation and zero signal depth attenuation...
February 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28205251/multishot-echo-planar-mreit-for-fast-imaging-of-conductivity-current-density-and-electric-field-distributions
#5
Munish Chauhan, Rohini Vidya Shankar, Neeta Ashok Kumar, Vikram D Kodibagkar, Rosalind Sadleir
PURPOSE: Magnetic resonance electrical impedance tomography (MREIT) sequences typically use conventional spin or gradient echo-based acquisition methods for reconstruction of conductivity and current density maps. Use of MREIT in functional and electroporation studies requires higher temporal resolution and faster sequences. Here, single and multishot echo planar imaging (EPI) based MREIT sequences were evaluated to see whether high-quality MREIT phase data could be obtained for rapid reconstruction of current density, conductivity, and electric fields...
February 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28202966/stable-colloids-in-molten-inorganic-salts
#6
Hao Zhang, Kinjal Dasbiswas, Nicholas B Ludwig, Gang Han, Byeongdu Lee, Suri Vaikuntanathan, Dmitri V Talapin
A colloidal solution is a homogeneous dispersion of particles or droplets of one phase (solute) in a second, typically liquid, phase (solvent). Colloids are ubiquitous in biological, chemical and technological processes, homogenizing highly dissimilar constituents. To stabilize a colloidal system against coalescence and aggregation, the surface of each solute particle is engineered to impose repulsive forces strong enough to overpower van der Waals attraction and keep the particles separated from each other...
February 15, 2017: Nature
https://www.readbyqxmd.com/read/28195439/noninvasive-imaging-of-brain-oxygen-metabolism-in-children-with-primary-nocturnal-enuresis-during-natural-sleep
#7
Bing Yu, Mingzhu Huang, Xu Zhang, Hongwei Ma, Miao Peng, Qiyong Guo
A series of studies have revealed that nocturnal enuresis is closely related to hypoxia in children with primary nocturnal enuresis (PNE). However, brain oxygen metabolism of PNE children has not been investigated before. The purpose of this study was to investigate changes in whole-brain cerebral metabolic rate of oxygen (CMRO2 ), cerebral blood flow (CBF), and oxygen extraction fraction (OEF) in children suffering from PNE. We used the newly developed T2-relaxation-under-spin-tagging (TRUST) magnetic resonance imaging technique...
February 14, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28194732/late-post-avr-progression-of-bicuspid-aortopathy-link-to-hemodynamics
#8
Shiho Naito, Tatiana Gross, Kushtrim Disha, Yskert von Kodolitsch, Hermann Reichenspurner, Evaldas Girdauskas
BACKGROUND AND AIM OF THE STUDY: The ascending aortic dilatation may progress after aortic valve replacement (AVR) in bicuspid aortic valve (BAV) patients. Our aim was to evaluate rheological flow patterns and histological characteristics of the aneurysmal aorta in BAV patients at the time of reoperative aortic surgery. MATERIALS AND METHODS: 13 patients (mean age: 42 ± 9 years, 10 (77%) male) with significant progression of proximal aortopathy after isolated AVR surgery for BAV disease (i...
February 13, 2017: General Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28190607/patient-specific-assessment-of-hemodynamics-by-computational-fluid-dynamics-in-patients-with-bicuspid-aortopathy
#9
Naoyuki Kimura, Masanori Nakamura, Kenji Komiya, Satoshi Nishi, Atsushi Yamaguchi, Osamu Tanaka, Yoshio Misawa, Hideo Adachi, Koji Kawahito
OBJECTIVE: Hemodynamics related to eccentric blood flow may factor into the development of bicuspid aortic valve aortopathy. We investigated wall shear stress distribution by means of magnetic resonance imaging-based computational fluid dynamics in patients with a bicuspid aortic valve. METHODS: Included were 12 patients with a bicuspid aortic valve (aortic stenosis, n = 11; root enlargement, n = 1). Three patients with a normal tricuspid aortic valve (arch aneurysm, n = 1; descending aortic aneurysm, n = 2) were included for comparison...
January 11, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28185310/multifrequency-reconstruction-for-frequency-modulated-bssfp
#10
Anne Slawig, Tobias Wech, Valentin Ratz, Johannes Tran-Gia, Henning Neubauer, Thorsten Bley, Herbert Köstler
PURPOSE: Banding artifacts in images acquired by balanced steady-state free precession (bSSFP) remain a challenge in MRI as they considerably reduce image quality, and diagnostic value deteriorates accordingly. As the steady-state tolerates small shifts in frequency, it is possible to acquire frequency-modulated bSSFP. Unfortunately, standard reconstructions of such measurements suffer from signal loss. Our study proposes a multifrequency reconstruction and demonstrates its capability of suppressing banding artifacts while retaining the high signal level of standard bSSFP...
February 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28184160/tunable-and-noncytotoxic-pet-spect-mri-multimodality-imaging-probes-using-colloidally-stable-ligand-free-superparamagnetic-iron-oxide-nanoparticles
#11
Th Nguyen Pham, Nigel A Lengkeek, Ivan Greguric, Byung J Kim, Paul A Pellegrini, Stephanie A Bickley, Marcel R Tanudji, Stephen K Jones, Brian S Hawkett, Binh Tt Pham
Physiologically stable multimodality imaging probes for positron emission tomography/single-photon emission computed tomography (PET/SPECT)-magnetic resonance imaging (MRI) were synthesized using the superparamagnetic maghemite iron oxide (γ-Fe2O3) nanoparticles (SPIONs). The SPIONs were sterically stabilized with a finely tuned mixture of diblock copolymers with either methoxypolyethylene glycol (MPEG) or primary amine NH2 end groups. The radioisotope for PET or SPECT imaging was incorporated with the SPIONs at high temperature...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28183320/real-time-phase-contrast-flow-cardiovascular-magnetic-resonance-with-low-rank-modeling-and-parallel-imaging
#12
Aiqi Sun, Bo Zhao, Yunduo Li, Qiong He, Rui Li, Chun Yuan
BACKGROUND: Conventional phase-contrast cardiovascular magnetic resonance (PC-CMR) employs cine-based acquisitions to assess blood flow condition, in which electro-cardiogram (ECG) gating and respiration control are generally required. This often results in lower acquisition efficiency, and limited utility in the presence of cardiovascular pathology (e.g., cardiac arrhythmia). Real-time PC-CMR, without ECG gating and respiration control, is a promising alternative that could overcome limitations of the conventional approach...
February 10, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28181333/respiratory-motion-artifacts-during-arterial-phase-imaging-with-gadoxetic-acid-can-the-injection-protocol-minimize-this-drawback
#13
Stephan H Polanec, Hubert Bickel, Pascal A T Baltzer, Patrick Thurner, Florian Gittler, Jacqueline C Hodge, Mustafa R Bashir, Ahmed Ba-Ssalamah
PURPOSE: To determine which of three gadoxetic acid injection techniques best reduced the contrast-related arterial-phase motion artifacts. MATERIALS AND METHODS: This Institutional Review Board (IRB)-approved, retrospective study included a cohort of 78 consecutive patients who each had serial gadoxetic acid-enhanced 3.0T magnetic resonance imaging (MRI) of the liver (0.025 mmol/kg body weight) performed with at least two of three injection techniques: M1 test bolus, undiluted, power-injected 1 mL/s; M2 test bolus, diluted 50% with saline, power-injected 1 mL/s; M3 fixed delay, undiluted, manually injected...
February 9, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28176779/scanning-tunnelling-spectroscopy-as-a-probe-of-multi-q-magnetic-states-of-itinerant-magnets
#14
Maria N Gastiasoro, Ilya Eremin, Rafael M Fernandes, Brian M Andersen
The combination of electronic correlations and Fermi surfaces with multiple nesting vectors can lead to the appearance of complex multi-Q magnetic ground states, hosting unusual states such as chiral density waves and quantum Hall insulators. Distinguishing single-Q and multi-Q magnetic phases is however a notoriously difficult experimental problem. Here we propose theoretically that the local density of states (LDOS) near a magnetic impurity, whose orientation may be controlled by an external magnetic field, can be used to map out the detailed magnetic configuration of an itinerant system and distinguish unambiguously between single-Q and multi-Q phases...
February 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28167399/adapted-mr-velocimetry-of-slow-liquid-flow-in-porous-media
#15
Li Huang, Gerd Mikolajczyk, Ekkehard Küstermann, Michaela Wilhelm, Stefan Odenbach, Wolfgang Dreher
MR velocimetry of liquid flow in opaque porous filters may play an important role in better understanding the mechanisms of deep bed filtration. With this knowledge, the efficiency of separating the suspended solid particles from the vertically flowing liquid can be improved, and thus a wide range of industrial applications such as wastewater treatment and desalination can be optimized. However, MR velocimetry is challenging for such studies due to the low velocities, the severe B0 inhomogeneity in porous structures, and the demand for high spatial resolution and an appropriate total measurement time during which the particle deposition will change velocities only marginally...
January 27, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28165646/simultaneous-noncontrast-angiography-and-intraplaque-hemorrhage-snap-imaging-comparison-with-contrast-enhanced-mr-angiography-for-measuring-carotid-stenosis
#16
Hongge Shu, Jie Sun, Thomas S Hatsukami, Niranjan Balu, Daniel S Hippe, Haining Liu, Ted R Kohler, Wenzhen Zhu, Chun Yuan
PURPOSE: To evaluate in a proof-of-concept study the feasibility of Simultaneous Noncontrast Angiography and intraPlaque hemorrhage (SNAP) imaging as a clinical magnetic resonance angiography (MRA) technique for measuring carotid stenosis. There is a growing interest in detecting intraplaque hemorrhage (IPH) during the clinical management of carotid disease, yet luminal stenosis has remained indispensable during clinical decision-making. SNAP imaging has been proposed as a novel IPH imaging technique that provides carotid MRA with no added scan time...
February 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28163657/successful-treatment-of-deep-vein-thrombosis-caused-by-iliac-vein-compression-syndrome-with-a-single-dose-direct-oral-anti-coagulant
#17
Naoya Nakashima, Daisuke Sueta, Yusuke Kanemaru, Seiji Takashio, Eiichiro Yamamoto, Shinsuke Hanatani, Hisanori Kanazawa, Yasuhiro Izumiya, Sunao Kojima, Koichi Kaikita, Seiji Hokimoto, Kenichi Tsujita
BACKGROUND: Although vein stenting is popular for treatment for venous thromboembolism due to mechanical compression, some cases are forced to avoid inserting align agents because of immunodeficiency. CASE PRESENTATION: An 82-year-old man with left extremity redness and swelling presented to a hospital for a medical evaluation. The patient was immunodeficient because of the adverse effects of his treatment for Castleman's disease. A contrast-enhanced computed tomography scan revealed a venous thromboembolism in inferior vena cava and the left lower extremity...
2017: Thrombosis Journal
https://www.readbyqxmd.com/read/28163293/a-case-of-poorly-differentiated-mucinous-carcinoma-of-the-gallbladder-that-exhibited-a-peculiar-morphology
#18
Takahiro Urata, Michiko Nagamine, Naotaka Kugiyama, Kana Noda, Ryo Ichikawa, Masataka Takeguchi, Kazuhito Yoshimoto, Nobuhiro Minami, Hideki Kitada, Yoshi Takekuma
A 65-year-old female presented with an elevated lesion that was identified in the gallbladder fundus via abdominal ultrasound during a medical checkup. The tumor was a pedunculated lesion, measuring 30mm in diameter, that exhibited a blood flow pattern with gradual dense staining throughout the equilibrium phase on the abdominal contrast computed tomography and a high signal intensity on T2-weighted magnetic resonance imaging. Histopathological findings revealed the proliferation of poorly differentiated adenocarcinoma, including signet ring cells, throughout the tumor along with the formation of a mucous lake...
2017: Nihon Shokakibyo Gakkai Zasshi, the Japanese Journal of Gastro-enterology
https://www.readbyqxmd.com/read/28161877/minimizing-the-blood-velocity-differences-between-phase-contrast-magnetic-resonance-imaging-and-computational-fluid-dynamics-simulation-in-cerebral-arteries-and-aneurysms
#19
Mohd Azrul Hisham Mohd Adib, Satoshi Ii, Yoshiyuki Watanabe, Shigeo Wada
The integration of phase-contrast magnetic resonance images (PC-MRI) and computational fluid dynamics (CFD) is a way to obtain detailed information of patient-specific hemodynamics. This study proposes a novel strategy for imposing a pressure condition on the outlet boundary (called the outlet pressure) in CFD to minimize velocity differences between the PC-MRI measurement and the CFD simulation, and to investigate the effects of outlet pressure on the numerical solution. The investigation involved ten patient-specific aneurysms reconstructed from a digital subtraction angiography image, specifically on aneurysms located at the bifurcation region...
February 4, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28160948/the-radiologist-s-role-in-the-management-of-papillary-renal-cell-carcinoma
#20
M Á Corral de la Calle, J Encinas de la Iglesia, M R Martín López, G C Fernández Pérez, D S Águeda Del Bas
Papillary carcinoma is the second most common renal cell carcinoma. It has a better prognosis than the more frequent clear cell carcinoma, although this does not hold true for advanced cases, because no specific treatment exists. It presents as a circumscribed peripheral tumor (small and homogeneously solid or larger and cystic/hemorrhagic) or as an infiltrating lesion that invades the veins, which has a worse prognosis. Due to their low vascular density, papillary renal cell carcinomas enhance less than other renal tumors, and this facilitates their characterization...
February 1, 2017: Radiología
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