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Hyperpolarized MRI

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https://www.readbyqxmd.com/read/29779258/hyperpolarized-porous-silicon-nanoparticles-potential-theragnostic-material-for-%C3%A2-%C3%A2-si-magnetic-resonance-imaging
#1
Hyeonglim Seo, Ikjang Choi, Nicholas Whiting, Jingzhe Hu, Quy Son Luu, Shivanand Pudakalakatti, Caitlin McCowan, Yaewon Kim, Niki Zacharias, Seunghyun Lee, Pratip Bhattacharya, Youngbok Lee
Porous silicon nanoparticles have recently garnered attention as potentially-promising biomedical platforms for drug delivery and medical diagnostics. Here, we demonstrate porous silicon nanoparticles as contrast agents for ²⁹Si magnetic resonance imaging. Size-controlled porous silicon nanoparticles were synthesized by magnesiothermic reduction of silica nanoparticles and were surface activated for further functionalization. Particles were hyperpolarized via dynamic nuclear polarization to enhance their ²⁹Si MR signals; the particles demonstrated long ²⁹Si spin-lattice relaxation (T₁) times (~ 25 mins), which suggests potential applicability for medical imaging...
May 20, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29769199/metabolic-imaging-of-the-human-brain-with-hyperpolarized-13c-pyruvate-demonstrates-13c-lactate-production-in-brain-tumor-patients
#2
Vesselin Z Miloushev, Kristin L Granlund, Rostislav Boltyanskiy, Serge K Lyashchenko, Lisa M DeAngelis, Ingo K Mellinghoff, Cameron W Brennan, Viviane Tabar, T Jonathan Yang, Andrei I Holodny, Ramon E Sosa, YanWei W Guo, Albert P Chen, James Tropp, Fraser Robb, Kayvan R Keshari
Hyperpolarized (HP) magnetic resonance imaging using [1-13C] pyruvate is a novel method that can characterize energy metabolism in the human brain and brain tumors. Here we present the first dynamically acquired human brain HP 13C metabolic spectra and spatial metabolite maps in cases of both untreated and recurrent tumors. In vivo production of HP lactate from HP pyruvate by tumors was indicative of altered cancer metabolism, while production of HP lactate in the entire brain was likely due to baseline metabolism...
May 16, 2018: Cancer Research
https://www.readbyqxmd.com/read/29743565/assessment-of-pulmonary-gas-transport-in-rabbits-using-hyperpolarized-xenon-129-magnetic-resonance-imaging
#3
Kai Ruppert, Hooman Hamedani, Faraz Amzajerdian, Yi Xin, Ian F Duncan, Harrilla Profka, Sarmad Siddiqui, Mehrdad Pourfathi, Stephen Kadlecek, Rahim R Rizi
Many forms of lung disease manifest themselves as pathological changes in the transport of gas to the circulatory system, yet the difficulty of imaging this process remains a central obstacle to the comprehensive diagnosis of lung disorders. Using hyperpolarized xenon-129 as a surrogate marker for oxygen, we derived the temporal dynamics of gas transport from the ratio of two lung images obtained with different timing parameters. Additionally, by monitoring changes in the total hyperpolarized xenon signal intensity in the left side of the heart induced by depletion of xenon signal in the alveolar airspaces of interest, we quantified the contributions of selected lung volumes to the total pulmonary gas transport...
May 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29729010/lung-morphometry-using-hyperpolarized-129-xe-multi-b-diffusion-mri-with-compressed-sensing-in-healthy-subjects-and-patients-with-copd
#4
Huiting Zhang, Junshuai Xie, Sa Xiao, Xiuchao Zhao, Ming Zhang, Lei Shi, Ke Wang, Guangyao Wu, Xianping Sun, Chaohui Ye, Xin Zhou
PURPOSE: To demonstrate the feasibility of compressed sensing (CS) to accelerate the acquisition of hyperpolarized (HP) 129 Xe multi-b diffusion MRI for quantitative assessments of lung microstructural morphometry. METHODS: Six healthy subjects and six chronic obstructive pulmonary disease (COPD) subjects underwent HP 129 Xe multi-b diffusion MRI (b = 0, 10, 20, 30, and 40 s/cm2 ). First, a fully sampled (FS) acquisition of HP 129 Xe multi-b diffusion MRI was conducted in one healthy subject...
May 4, 2018: Medical Physics
https://www.readbyqxmd.com/read/29726563/late-stage-deuteration-of-13-c-enriched-substrates-for-t-1-prolongation-in-hyperpolarized-13-c-mri
#5
Céline Taglang, David E Korenchan, Cornelius von Morze, Justin Yu, Chloé Najac, Sinan Wang, Joseph E Blecha, Sukumar Subramaniam, Robert Bok, Henry F VanBrocklin, Daniel B Vigneron, Sabrina M Ronen, Renuka Sriram, John Kurhanewicz, David M Wilson, Robert R Flavell
A robust and selective late-stage deuteration methodology was applied to 13C-enriched amino and alpha hydroxy acids to increase spin-lattice relaxation constant T1 for hyperpolarized 13C magnetic resonance imaging. For the five substrates with 13C-labeling on the C1-position ([1-13C]alanine, [1-13C]serine, [1-13C]lactate, [1-13C]glycine, and [1-13C]valine), significant increase of their T1 was observed at 3 T with deuterium labeling (+26%, 22%, +16%, +25% and +29%, respectively). Remarkably, in the case of [2-13C]alanine, [2-13C]serine and [2-13C]lactate, deuterium labeling led to a greater than four fold increase in T1...
May 4, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29705031/-3-he-diffusion-mri-in-human-lungs
#6
Jason C Woods, Mark S Conradi
Hyperpolarized 3 He gas allows the air spaces of the lungs to be imaged via MRI. Imaging of restricted diffusion is addressed here, which allows the microstructure of the lung to be characterized through the physical restrictions to gas diffusion presented by airway and alveolar walls in the lung. Measurements of the apparent diffusion coefficient (ADC) of 3 He at time scales of milliseconds and seconds are compared; measurement of acinar airway sizes by determination of the microscopic anisotropy of diffusion is discussed...
April 25, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29682792/rapid-assessment-of-pulmonary-gas-transport-with-hyperpolarized-129xe-mri-using-a-3d-radial-double-golden-means-acquisition-with-variable-flip-angles
#7
Kai Ruppert, Faraz Amzajerdian, Hooman Hamedani, Yi Xin, Luis Loza, Tahmina Achekzai, Ian F Duncan, Harrilla Profka, Sarmad Siddiqui, Mehrdad Pourfathi, Maurizio F Cereda, Stephen Kadlecek, Rahim R Rizi
PURPOSE: To demonstrate the feasibility of using a 3D radial double golden-means acquisition with variable flip angles to monitor pulmonary gas transport in a single breath hold with hyperpolarized xenon-129 MRI. METHODS: Hyperpolarized xenon-129 MRI scans with interleaved gas-phase and dissolved-phase excitations were performed using a 3D radial double golden-means acquisition in mechanically ventilated rabbits. The flip angle was either held fixed at 15 ° or 5 °, or it was varied linearly in ascending or descending order between 5 ° and 15 ° over a sampling interval of 1000 spokes...
April 22, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29674325/adenylate-cyclase-type-9-adcy9-inactivation-protects-from-atherosclerosis-only-in-the-absence-of-cholesteryl-ester-transfer-protein-cetp
#8
Yohann Rautureau, Vanessa Deschambault, Marie-Ève Higgins, Daniel Rivas, Mélanie Mecteau, Pascale Geoffroy, Géraldine Miquel, Kurunradeth Uy, Rocio Sanchez, Véronique Lavoie, Geneviève Brand, Audrey Nault, Pierre-Marc Williams, Maria Laura Suarez, Nolwenn Merlet, Line Lapointe, Natacha Duquette, Marc-Antoine Gillis, Samaneh Samami, Gaétan Mayer, Philippe Pouliot, Adeline Raignault, Foued Maafi, Mathieu R Brodeur, Sylvie Levesque, Marie-Claude Guertin, Marie-Pierre Dubé, Éric Thorin, David Rhainds, Éric Rhéaume, Jean-Claude Tardif
Background -Pharmacogenomic studies have shown that ADCY9 genotype determines the effects of the cholesteryl ester transfer protein (CETP) inhibitor dalcetrapib on cardiovascular events and atherosclerosis imaging. The underlying mechanisms responsible for the interactions between ADCY9 and CETP activity have not yet been determined. Methods - Adcy9 -inactivated ( Adcy9 Gt/Gt ) and wild-type (WT) mice, that were or not transgenic for the CETP gene (CETPtg Adcy9 Gt/Gt and CETPtg Adcy9 WT ), were submitted to an atherogenic protocol (injection of an AAV8 expressing a PCSK9 gain-of-function variant and 0...
April 19, 2018: Circulation
https://www.readbyqxmd.com/read/29673533/brain-imaging-using-hyperpolarized-129-xe-magnetic-resonance-imaging
#9
Simrun Chahal, Braedan R J Prete, Alanna Wade, Francis T Hane, Mitchell S Albert
Hyperpolarized (HP) 129 Xe magnetic resonance imaging (MRI) is a novel iteration of traditional MRI that relies on detecting the spins of 1 H. Since 129 Xe is a gaseous signal source, it can be used for lung imaging. Additionally, 129 Xe dissolves in the blood stream and can therefore be detectable in the brain parenchyma and vasculature. In this work, we provide detailed information on the protocols that we have developed to image 129 Xe within the brains of both rodents and human subjects.
2018: Methods in Enzymology
https://www.readbyqxmd.com/read/29656880/fundamentals-of-functional-imaging-ii-emerging-mr-techniques-and-new-methods-of-analysis
#10
A Luna, T Martín Noguerol, L Alcalá Mata
Current multiparameter MRI protocols integrate structural, physiological, and metabolic information about cancer. Emerging techniques such as arterial spin-labeling (ASL), blood oxygen level dependent (BOLD), MR elastography, chemical exchange saturation transfer (CEST), and hyperpolarization provide new information and will likely be integrated into daily clinical practice in the near future. Furthermore, there is great interest in the study of tumor heterogeneity as a prognostic factor and in relation to resistance to treatment, and this interest is leading to the application of new methods of analysis of multiparametric protocols...
April 12, 2018: Radiología
https://www.readbyqxmd.com/read/29652146/dissolution-dynamic-nuclear-polarization-at-room-temperature-using-photoexcited-triplet-electrons
#11
Makoto Negoro, Akinori Kagawa, Kenichiro Tateishi, Yoshiki Tanaka, Tomohiro Yuasa, Keigo Takahashi, Masahiro Kitagawa
Dissolution dynamic nuclear polarization (DNP) has recently gained attention as a method to enhance the sensitivity of liquid NMR spectroscopy and MRI. Here, we demonstrate dissolution of the sample hyperpolarized by DNP using photoexcited triplet electrons in 0.38 T at room temperature. The achieved polarization of 0.8% is 6100 times as high as that at thermal equilibrium in the condition. The result is an important step for DNP using photoexcited triplet electrons to become widely used in chemical and biomedical research...
April 13, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29567434/using-a-local-low-rank-plus-sparse-reconstruction-to-accelerate-dynamic-hyperpolarized-13-c-imaging-using-the-bssfp-sequence
#12
Eugene Milshteyn, Cornelius von Morze, Galen D Reed, Hong Shang, Peter J Shin, Peder E Z Larson, Daniel B Vigneron
Acceleration of dynamic 2D (T2 Mapping) and 3D hyperpolarized13 C MRI acquisitions using the balanced steady-state free precession sequence was achieved with a specialized reconstruction method, based on the combination of low rank plus sparse and local low rank reconstructions. Methods were validated using both retrospectively and prospectively undersampled in vivo data from normal rats and tumor-bearing mice. Four-fold acceleration of 1-2 mm isotropic 3D dynamic acquisitions with 2-5 s temporal resolution and two-fold acceleration of 0...
March 11, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29549792/considering-low-rank-sparse-and-gas-inflow-effects-constraints-for-accelerated-pulmonary-dynamic-hyperpolarized-129-xe-mri
#13
Sa Xiao, He Deng, Caohui Duan, Junshuai Xie, Huiting Zhang, Xianping Sun, Chaohui Ye, Xin Zhou
Dynamic hyperpolarized (HP) 129 Xe MRI is able to visualize the process of lung ventilation, which potentially provides unique information about lung physiology and pathophysiology. However, the longitudinal magnetization of HP 129 Xe is nonrenewable, making it difficult to achieve high image quality while maintaining high temporal-spatial resolution in the pulmonary dynamic MRI. In this paper, we propose a new accelerated dynamic HP 129 Xe MRI scheme incorporating the low-rank, sparse and gas-inflow effects (L + S + G) constraints...
May 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29549770/proteins-air-and-water-reporter-genes-for-ultrasound-and-magnetic-resonance-imaging
#14
REVIEW
George J Lu, Arash Farhadi, Arnab Mukherjee, Mikhail G Shapiro
A long-standing goal of molecular imaging is to visualize cellular function within the context of living animals, necessitating the development of reporter genes compatible with deeply penetrant imaging modalities such as ultrasound and magnetic resonance imaging (MRI). Until recently, no reporter genes for ultrasound were available, and most genetically encoded reporters for MRI were limited by metal availability or relatively low sensitivity. Here we review how these limitations are being addressed by recently introduced reporter genes based on air-filled and water-transporting biomolecules...
March 14, 2018: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/29536045/-15-n-4-1-2-4-5-tetrazines-as-potential-molecular-tags-integrating-bioorthogonal-chemistry-with-hyperpolarization-and-unearthing-para-n-2
#15
Junu Bae, Zijian Zhou, Thomas Theis, Warren S Warren, Qiu Wang
Hyperpolarized magnetic resonance (HP-MR) is a powerful, sensitive, and noninvasive approach to visualize molecular structure, function, and dynamics in vitro and in vivo. Current applications of HP-MR mostly rely on hyperpolarization of target compounds in dedicated hyperpolarizers because biomolecules can typically not be hyperpolarized directly in vivo. The injected hyperpolarized probes often undergo multiple metabolic pathways in living systems, and it remains challenging to localize and identify specific targets with high chemical selectivity...
March 2018: Science Advances
https://www.readbyqxmd.com/read/29526883/ethyl-pyruvate-improves-pulmonary-function-in-mice-with-bleomycin-induced-lung-injury-as-monitored-with-hyperpolarized-129-xe-mr-imaging
#16
Shota Hodono, Akihiro Shimokawa, Neil J Stewart, Yukiko Yamauchi, Renya Nishimori, Mami Yamane, Hirohiko Imai, Hideaki Fujiwara, Atsuomi Kimura
PURPOSE: High Mobility Group Box1 (HMGB1), which is one of the damage-associated molecular pattern molecules relating to various inflammatory diseases, has gained interest as a therapeutic target because of its involvement in wound healing processes. In the present study, we investigated HMGB1 as a potential therapeutic target in a model of lung fibrosis using a preclinical hyperpolarized 129 Xe (HPXe) MRI system. METHODS: Lung injury was induced by intra-peritoneal injection of bleomycin (BLM) in 19 mice...
March 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29520870/effects-of-anesthesia-on-renal-function-and-metabolism-in-rats-assessed-by-hyperpolarized-mri
#17
Haiyun Qi, Christian Østergaard Mariager, Jakob Lindhardt, Per Mose Nielsen, Hans Stødkilde-Jørgensen, Christoffer Laustsen
PURPOSE: Anesthesia is necessary for most animal studies requiring invasive procedures. It is well documented that various types of anesthesia modulate a wide variety of important metabolic and functional processes in the body, and as such, represent a potential limitation in the study design. In the present study, we aimed to investigate the renal functional and metabolic consequences of 3 typical rodent anesthetics used in preclinical MRI: sevoflurane, inaction, and a mixture of fentanyl, fluanisone, and midazolam (FFM)...
March 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29504181/comparison-of-3-he-and-129-xe-mri-for-evaluation-of-lung-microstructure-and-ventilation-at-1-5t
#18
Neil J Stewart, Ho-Fung Chan, Paul J C Hughes, Felix C Horn, Graham Norquay, Madhwesha Rao, Denise P Yates, Rob H Ireland, Matthew Q Hatton, Bilal A Tahir, Paul Ford, Andrew J Swift, Rod Lawson, Helen Marshall, Guilhem J Collier, Jim M Wild
BACKGROUND: To support translational lung MRI research with hyperpolarized 129 Xe gas, comprehensive evaluation of derived quantitative lung function measures against established measures from 3 He MRI is required. Few comparative studies have been performed to date, only at 3T, and multisession repeatability of 129 Xe functional metrics have not been reported. PURPOSE/HYPOTHESIS: To compare hyperpolarized 129 Xe and 3 He MRI-derived quantitative metrics of lung ventilation and microstructure, and their repeatability, at 1...
March 5, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29488244/in-vivo-hyperpolarization-transfer-in-a-clinical-mri-scanner
#19
Cornelius von Morze, Galen D Reed, Peder E Larson, Daniele Mammoli, Albert P Chen, James Tropp, Mark Van Criekinge, Michael A Ohliger, John Kurhanewicz, Daniel B Vigneron, Matthew E Merritt
PURPOSE: The purpose of this study was to investigate the feasibility of in vivo 13 C->1 H hyperpolarization transfer, which has significant potential advantages for detecting the distribution and metabolism of hyperpolarized 13 C probes in a clinical MRI scanner. METHODS: A standalone pulsed 13 C RF transmit channel was developed for operation in conjunction with the standard 1 H channel of a clinical 3T MRI scanner. Pulse sequences for 13 C power calibration and polarization transfer were programmed on the external hardware and integrated with a customized water-suppressed 1 H MRS acquisition running in parallel on the scanner...
August 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29484795/parahydrogen-based-hyperpolarization-for-biomedicine
#20
Jan Hovener, Andrey N Pravdivtsev, Bryce Kidd, C Russel Bowers, Stefan Glöggler, Kirill V Kovtunov, Markus Plaumann, Rachel Katz-Brull, Kai Buckenmaier, Alexej Jerschow, Francesca Reineri, Thomas Theis, Roman V Shchepin, Shawn Wagner, Niki M M Zacharias, Pratip Bhattacharya, Eduard Y Chekmenev
NMR is one of the most versatile and useful physical effects used for human imaging, chemical analysis and the elucidation of molecular structures. Yet, the full potential of NMR is hardly ever used, because only a small fraction of the nuclear spin ensemble is polarized - i.e. aligned with the applied static magnetic field. This fraction is termed nuclear spin polarization P. As a result, no more than a few parts per million of all nuclear spins effectively contribute to the signal in all magnetic fields (B0) available for NMR or MRI today...
February 27, 2018: Angewandte Chemie
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