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Papers in Regional Science > 99 > 1 > 1 - 2

No abstract is available for this article.

article

Elastic Worker: Time‐Sense, Energy and the Paradox of Resilience

A. Rebecca Rozelle‐Stone

Philosophical Investigations > 43 > 1-2 > 177 - 196

This essay considers Simone Weil's experiences in factories and her social–political reflections on work, time and energy, in conjunction with arguments from theorists Melissa Gregg, Theodor Adorno and Sara Ahmed, to raise questions about supposedly humane interventions, including the cultivation of resilience, in the contemporary workplace. The transition from time‐sense in factory work at the turn...

article

Having an Inner Life

Eric O. Springsted

Philosophical Investigations > 43 > 1-2 > 142 - 157

We readily recognize the concept of an inner life as a moral category. We struggle to say what an inner life is, though. This essay examines and rejects naturalistic attempts to either dismiss the idea of an inner life or make it a matter of brain states, a sort of efficient causality to behaviour. Relying on Simone Weil's distinction between “the language of the market place and the language of the...

article

Personal Identity and National Identity: An Analogy

Robert Chenavier

Philosophical Investigations > 43 > 1-2 > 158 - 164

Simone Weil writes in one of her notebooks: “When one arrives at the absolute one can only express oneself by identities … – For identity alone expresses the unconditioned” (Cahiers, in Œuvres complètes, t. VI, vol. 4 (Paris: Gallimard, 2006), 113). Thus, it is that “the good is the good”, one and the same, unconditionally. Certainly, an individual is unique, a nation is equally so. Nevertheless,...

article

7T bone perfusion imaging of the knee using arterial spin labeling MRI

Xiufeng Li, Casey P. Johnson, Jutta Ellermann

Magnetic Resonance in Medicine > 83 > 5 > 1577 - 1586

Purpose To evaluate the feasibility of arterial spin labeling (ASL) imaging of epiphyseal bone marrow in the distal femoral condyle of the knee at 7T MRI. Methods The knees of 7 healthy volunteers were imaged with ASL using a 7T whole body MRI scanner and a 28‐channel knee coil. ASL imaging used a flow‐sensitive alternating inversion recovery method for labeling and a single‐shot fast spin echo...

article

Magnetic resonance imaging of obesity and metabolic disorders: Summary from the 2019 ISMRM Workshop

Houchun H. Hu, Rosa Tamara Branca, Diego Hernando, Dimitrios C. Karampinos, more

Magnetic Resonance in Medicine > 83 > 5 > 1565 - 1576

More than 100 attendees from Australia, Austria, Belgium, Canada, China, Germany, Hong Kong, Indonesia, Japan, Malaysia, the Netherlands, the Philippines, Republic of Korea, Singapore, Sweden, Switzerland, the United Kingdom, and the United States convened in Singapore for the 2019 ISMRM‐sponsored workshop on MRI of Obesity and Metabolic Disorders. The scientific program brought together a multidisciplinary...

article

Erratum to: Improved chemical exchange saturation transfer imaging with real‐time frequency drift correction (Magn Reson Med. 2019; 81: 2915‐2923)

Ruibin Liu, Hongxi Zhang, Weiming Niu, Can Lai, more

Magnetic Resonance in Medicine > 83 > 5 > 1884 - 1884

article

Robust outer volume suppression utilizing elliptical pulsed second order fields (ECLIPSE) for human brain proton MRSI

Chathura Kumaragamage, Henk M. De Feyter, Peter Brown, Scott McIntyre, more

Magnetic Resonance in Medicine > 83 > 5 > 1539 - 1552

Purpose The robust and reliable utilization of proton magnetic resonance spectroscopic imaging (MRSI) at high fields is hampered by several key technical difficulties, including contamination from extracranial lipids. To that end, this work presents novel lipid suppression sequences for proton MRSI in the human brain utilizing elliptical localization with pulsed second‐order fields (ECLIPSE). Methods...

article

Validation and noise robustness assessment of microscopic anisotropy estimation with clinically feasible double diffusion encoding MRI

Leevi Kerkelä, Rafael Neto Henriques, Matt G. Hall, Chris A. Clark, more

Magnetic Resonance in Medicine > 83 > 5 > 1698 - 1710

Purpose Double diffusion encoding (DDE) MRI enables the estimation of microscopic diffusion anisotropy, yielding valuable information on tissue microstructure. A recent study proposed that the acquisition of rotationally invariant DDE metrics, typically obtained using a spherical “5‐design,” could be greatly simplified by assuming Gaussian diffusion, facilitating reduced acquisition times that are...

article

Referenceless multi‐channel signal combination: A demonstration in chemical‐shift‐encoded water‐fat imaging

Magnetic Resonance in Medicine > 83 > 5 > C1 - C1

article

Spin‐lock imaging of intrinsic susceptibility gradients in tumors

Zhongliang Zu, Vaibhav Janve, John C. Gore

Magnetic Resonance in Medicine > 83 > 5 > 1587 - 1595

Purpose Previous studies have shown that diffusion of water through intrinsic susceptibility gradients produces a dispersion of the spin‐lattice relaxation rate in the rotating frame (R₁_ρ) over a low range of spin‐locking amplitudes (0 < ω₁ < 100 Hz), whereas at higher ω₁ and high magnetic fields, a second dispersion arises due to chemical exchange. Here, we separated these different effects...

article

Imaging the distribution of iron oxide nanoparticles in hypothermic perfused tissues

Hattie L. Ring, Zhe Gao, Anirudh Sharma, Zonghu Han, more

Magnetic Resonance in Medicine > 83 > 5 > 1750 - 1759

Purpose Herein, we evaluate the use of MRI as a tool for assessing iron oxide nanoparticle (IONP) distribution within IONP perfused organs and vascularized composite allografts (VCAs) (i.e., hindlimbs) prepared for cryopreservation. Methods Magnetic resonance imaging was performed on room‐temperature organs and VCAs perfused with IONPs and were assessed at 9.4 T. Quantitative T₁ mapping and

T_{2}^{*}

...

article

Near‐isotropic noncontrast MRA of the renal and peripheral arteries using a thin‐slab stack‐of‐stars quiescent interval slice‐selective acquisition

Robert R. Edelman, Emily Aherne, Nondas Leloudas, Jianing Pang, more

Magnetic Resonance in Medicine > 83 > 5 > 1711 - 1720

Purpose Noncontrast MRA avoids potential risks from gadolinium‐based contrast agents. A 2D noncontrast technique, quiescent interval slice‐selective (QISS), accurately evaluates the peripheral arteries but has limited spatial resolution along the slice direction. We therefore implemented a prototype thin‐slab stack‐of‐stars version (tsSOS‐QISS) with nearly isotropic spatial resolution and tested...

article

Self‐calibrated interpolation of non‐Cartesian data with GRAPPA in parallel imaging

Seng‐Wei Chieh, Mostafa Kaveh, Mehmet Akçakaya, Steen Moeller

Magnetic Resonance in Medicine > 83 > 5 > 1837 - 1850

Purpose To develop a non‐Cartesian k‐space reconstruction method using self‐calibrated region‐specific interpolation kernels for highly accelerated acquisitions. Methods In conventional non‐Cartesian GRAPPA with through‐time GRAPPA (TT‐GRAPPA), the use of region‐specific interpolation kernels has demonstrated improved reconstruction quality in dynamic imaging for highly accelerated acquisitions...

article

Rapid and motion‐robust volume coverage using cross‐sectional real‐time MRI

Dirk Voit, Oleksandr Kalentev, Maaike Zalk, Arun A. Joseph, more

Magnetic Resonance in Medicine > 83 > 5 > 1652 - 1658

Purpose To develop a rapid and motion‐robust technique for volumetric MRI, which is based on cross‐sectional real‐time MRI acquisitions with automatic advancement of the slice position. Methods Real‐time MRI with a frame‐by‐frame moving cross‐section is performed with use of highly undersampled radial gradient‐echo sequences offering spin density, T₁, or T₂/T₁ contrast. Joint reconstructions of...

article

Referenceless multi‐channel signal combination: A demonstration in chemical‐shift‐encoded water‐fat imaging

Simin Liu, Peng Wu, Haining Liu, Zhangxuan Hu, more

Magnetic Resonance in Medicine > 83 > 5 > 1810 - 1824

Purpose Without explicit coil sensitivity information acquired by means of a reference body coil, multi‐channel signal combination for water‐fat separation (WFS) can be challenging due to channel‐dependent phase offsets and chemical‐shift dependent phase shifts. This study aims to develop a referenceless, robust, accurate, and fast channel combination method for WFS. Theory and Methods A dual‐step...

article

Parameter optimization framework on wave gradients of Wave‐CAIPI imaging

Haifeng Wang, Zhilang Qiu, Shi Su, Sen Jia, more

Magnetic Resonance in Medicine > 83 > 5 > 1659 - 1672

Purpose To propose a parameter optimization framework on wave gradients of Wave‐CAIPI imaging for decreasing g‐factor penalty and reducing reconstruction artifacts. Theory and Methods The influences of parameters on g‐factor are theoretically analyzed. The average g‐factor is chosen as a metric for parameter optimization, and then a fast calculation method is proposed to approximately and ultra‐fast...

article

CEST MRI quantification procedures for breast cancer treatment‐related lymphedema therapy evaluation

Rachelle Crescenzi, Paula M. C. Donahue, Helen Mahany, Sarah K. Lants, more

Magnetic Resonance in Medicine > 83 > 5 > 1760 - 1773

Purpose To quantify chemical exchange saturation transfer contrast in upper extremities of participants with lymphedema before and after standardized lymphatic mobilization therapy using correction procedures for B₀ and B₁ heterogeneity, and T₁ relaxation. Methods Females with (n = 12) and without (n = 17) breast cancer treatment‐related lymphedema (BCRL) matched for age and body mass index were...

article

Chemical‐shift encoding–based water–fat separation with multifrequency fat spectrum modeling in spin‐lock MRI

Weitian Chen, Dimitrios C. Karampinos

Magnetic Resonance in Medicine > 83 > 5 > 1608 - 1624

Purpose Chemical exchange saturation transfer is used commonly to generate MRI contrast based on the chemical exchange effect. The spin‐lock techniques can also be used to probe the chemical exchange and other molecular motion processes in tissues. The presence of fat can cause errors in spin‐lock MRI. Signals from fat are typically suppressed based on spectral selectivity or T₁ nulling approaches...

article

A novel segmentation framework dedicated to the follow‐up of fat infiltration in individual muscles of patients with neuromuscular disorders

Augustin C. Ogier, Linda Heskamp, Constance P. Michel, Alexandre Fouré, more

Magnetic Resonance in Medicine > 83 > 5 > 1825 - 1836

Purpose To propose a novel segmentation framework that is dedicated to the follow‐up of fat infiltration in individual muscles of patients with neuromuscular disorders. Methods We designed a semi‐automatic segmentation pipeline of individual leg muscles in MR images based on automatic propagation through nonlinear registrations of initial delineation in a minimal number of MR slices. This approach...

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Issue Information

Elastic Worker: Time‐Sense, Energy and the Paradox of Resilience

Having an Inner Life

Personal Identity and National Identity: An Analogy

7T bone perfusion imaging of the knee using arterial spin labeling MRI

Magnetic resonance imaging of obesity and metabolic disorders: Summary from the 2019 ISMRM Workshop

Erratum to: Improved chemical exchange saturation transfer imaging with real‐time frequency drift correction (Magn Reson Med. 2019; 81: 2915‐2923)

Robust outer volume suppression utilizing elliptical pulsed second order fields (ECLIPSE) for human brain proton MRSI

Validation and noise robustness assessment of microscopic anisotropy estimation with clinically feasible double diffusion encoding MRI

Referenceless multi‐channel signal combination: A demonstration in chemical‐shift‐encoded water‐fat imaging

Spin‐lock imaging of intrinsic susceptibility gradients in tumors

Imaging the distribution of iron oxide nanoparticles in hypothermic perfused tissues

Near‐isotropic noncontrast MRA of the renal and peripheral arteries using a thin‐slab stack‐of‐stars quiescent interval slice‐selective acquisition

Self‐calibrated interpolation of non‐Cartesian data with GRAPPA in parallel imaging

Rapid and motion‐robust volume coverage using cross‐sectional real‐time MRI

Referenceless multi‐channel signal combination: A demonstration in chemical‐shift‐encoded water‐fat imaging

Parameter optimization framework on wave gradients of Wave‐CAIPI imaging

CEST MRI quantification procedures for breast cancer treatment‐related lymphedema therapy evaluation

Chemical‐shift encoding–based water–fat separation with multifrequency fat spectrum modeling in spin‐lock MRI

A novel segmentation framework dedicated to the follow‐up of fat infiltration in individual muscles of patients with neuromuscular disorders

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