Magnetic Resonance Materials in Physics, Biology and Medicine

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* Dữ liệu chỉ mang tính chất tham khảo

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Ảnh hưởng của việc hiệu chỉnh $$ T_{2}^{*} $$ đến phân tích mô hình động học độ tương phản sử dụng hàm đầu vào động mạch từ mô tham chiếu tại 7 T Dịch bởi AI
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 28 - Trang 555-563 - 2015
Jin Zhang, Melanie Freed, Kerryanne Winters, Sungheon G. Kim
Chúng tôi nhằm điều tra ảnh hưởng của việc hiệu chỉnh $$ T_{2}^{*} $$ đến ước lượng các tham số động học từ dữ liệu chụp cộng hưởng từ động tương phản (DCE) T 1-được trọng số khi một hàm đầu vào động mạch (AIF) từ mô tham chiếu được sử dụng. Dữ liệu DCE-MRI được thu thập từ bảy con chuột có khối u vú 4T1 bằng cách sử dụng chuỗi echo gradient đôi ở 7 T. AIF được ước lượng...... hiện toàn bộ
Magnetic resonance imaging detection of multiple ischemic injury produced in an adult rat model of minor stroke followed by mild transient cerebral ischemia
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 30 - Trang 175-188 - 2016
Ursula I. Tuor, Min Qiao
To determine whether cumulative brain damage produced adjacent to a minor stroke that is followed by a mild transient ischemia is detectable with MRI and histology, and whether acute or chronic recovery between insults influences this damage. A minor photothrombotic (PT) stroke was followed acutely (1–2 days) or chronically (7 days) by a mild transient middle cerebral artery occlusion (tMCAO). MRI...... hiện toàn bộ
31P-MR spectroscopy in human end-stage heart failure during therapy with recombinant human growth hormone
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 6 - Trang 171-172 - 1998
Thomas Wittlinger, Thomas Voigtländer, Karl Friedrich Kreitner, Peter Kalden, Sabine Genth-Zotz, Harald Darius, Martin Thelen, Jürgen Meyer
PASADENA hyperpolarization of 13C biomolecules: equipment design and installation
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 22 - Trang 111-121 - 2008
Jan-Bernd Hövener, Eduard Y. Chekmenev, Kent C. Harris, William H. Perman, Larry W. Robertson, Brian D. Ross, Pratip Bhattacharya
The PASADENA method has achieved hyperpolarization of 16–20% (exceeding 40,000-fold signal enhancement at 4.7 T), in liquid samples of biological molecules relevant to in vivo MRI and MRS. However, there exists no commercial apparatus to perform this experiment conveniently and reproducibly on the routine basis necessary for translation of PASADENA to questions of biomedical importance. The presen...... hiện toàn bộ
Test bolus measurement: effects of the respiratory position on bolus arrival time and signal-intensity-time curve quality
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 20 - Trang 181-181 - 2007
Rolf Janka, Marius Rudy, Michael Lell, Michael Uder, Werner Bautz, Evelyn Wenkel
Modeling and suppression of respiration induced B0-fluctuations in non-balanced steady-state free precession sequences at 7 Tesla
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 26 - Trang 377-387 - 2012
Pål Erik Goa, Benedikt Andreas Poser, Markus Barth
To develop and evaluate a model for describing the S1 (S+) and S2 (S−) phase in the presence of off-resonance frequency fluctuations, and to evaluate the performance of a novel interleaved navigator echo scheme. Using the extended phase graph model, a linear phase term was added to the evolution of transverse states. An approximation for the total S2 phase was derived with one fit parameter τl, wh...... hiện toàn bộ
Quantification of Choline-containing Compounds in Malignant Breast Tumors by 1H MR Spectroscopy Using Water as an Internal Reference at 1.5 T
Magnetic Resonance Materials in Physics, Biology and Medicine - - 2006
Hyun-Man Baik, Min-Ying Su, Hon Yu, Orhan Nalcioglu, Rita Mehta
The quantification of choline-containing compounds (Cho) in breast tumors by proton MR spectroscopy (1H-MRS) has been of great interest because such compounds have been linked to malignancy. In this study, an internal reference method for the absolute quantification of Cho metabolite in malignant breast tumors was presented using a clinical 1.5 T scanner. We performed in vitro measurements to exam...... hiện toàn bộ
Arterial input function in a dedicated slice for cerebral perfusion measurements in humans
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 31 - Trang 439-448 - 2017
Elias Kellner, Irina Mader, Marco Reisert, Horst Urbach, Valerij Gennadevic Kiselev
We aimed to modify our previously published method for arterial input function measurements for evaluation of cerebral perfusion (dynamic susceptibility contrast MRI) such that it can be applied in humans in a clinical setting. Similarly to our previous work, a conventional measurement sequence for dynamic susceptibility contrast MRI is extended with an additional measurement slice at the neck. Me...... hiện toàn bộ
Tackling SNR at low-field: a review of hardware approaches for point-of-care systems
Magnetic Resonance Materials in Physics, Biology and Medicine - Tập 36 - Trang 375-393 - 2023
Andrew Webb, Thomas O’Reilly
To review the major hardware components of low-field point-of-care MRI systems which affect the overall sensitivity. Designs for the following components are reviewed and analyzed: magnet, RF coils, transmit/receive switches, preamplifiers, data acquisition system, and methods for grounding and mitigating electromagnetic interference. High homogeneity magnets can be produced in a variety of differ...... hiện toàn bộ
Real-time MR navigation and localization of an intravascular catheter with ferromagnetic components
Magnetic Resonance Materials in Physics, Biology and Medicine - - 2010
Ke Zhang, Axel J. Krafft, Reiner Umathum, Florian Maier, Willi Semmler, Michael Bock
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