High-&amp;lt;tex&amp;gt;$rm T_rm c$&amp;lt;/tex&amp;gt;Superconducting Receiving Coils for Nuclear Magnetic Resonance Imaging

Lee, Hsu‐Lei; Lin, In-Tsang; Chen, Jyh-Horng; Horng, Herng-Er; Yang, Hong-Chang

doi:10.1109/tasc.2005.849582

Cited by 26 publications

(23 citation statements)

References 7 publications

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“…In our previous studies, high-T c superconducting Bi-2223 tape coils of 7 cm in diameter for 3-T MRI were studied [17]. An SNR gain of 1.5-fold for kiwi fruit imaging over the conventional copper coil at 77 K was obtained.…”

Section: E Discussionmentioning

confidence: 99%

A 40-mm High-Temperature Superconducting Surface Resonator in a 3-T MRI System: Simulations and Measurements

Lin

Yang

Chen

2011

IEEE Trans. Appl. Supercond.

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In this paper, the Ansoft high-frequency structure simulation (HFSS) was adapted to investigate the unloaded quality-factor value of the radio-frequency (RF) receiving resonator. This paper focused on the materials aspects, and a comparison between electromagnetic stimulations and measurement was conducted. A 40 mm in diameter Bi 2 Sr 2 Ca 2 Cu 3 O x (Bi-2223) tape high-T c superconducting RF resonator in 3 T was stimulated and built. The simulation models were established according to the experimental dimension of the Bi-2223 surface resonator. Measurements show that the Bi-2223 surface resonator at 77 K provides a gain of 3.84-fold signal-to-noise ratio on phantom images over that of the homemade copper resonator at 300 K. Measuring results were in accordance with predicted ones, and the difference between the predicted SNR gains and measured SNR gains is 1%. This paper suggests that using a Bi-2223 surface resonator at 77 K could be more useful for magnetic resonance imaging coils than a copper surface resonator at 300 K.Index Terms-Bi 2 Sr 2 Ca 2 Cu 3 O x (Bi-2223), high-frequency structure simulation (HFSS).

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Section: E Discussionmentioning

confidence: 99%

A 40-mm High-Temperature Superconducting Surface Resonator in a 3-T MRI System: Simulations and Measurements

Lin

Yang

Chen

2011

IEEE Trans. Appl. Supercond.

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“…A contrast agent may be applied nonspecifically to the entire embryo, shortening the T1-value of the tissue and thus allowing for a higher S/N ratio in the same imaging time (M. Tyszka, personal communication). Microsurface coils (Bilgen, 2004) could be used to visualize the embryo at much higher resolution than currently attainable, or the use of a recently available cryoprobe (Lee et al, 2005) may also improve the S/N ratio.…”

Section: Discussionmentioning

confidence: 99%

Two‐dimensional and three‐dimensional time‐lapse microscopic magnetic resonance imaging of Xenopus gastrulation movements using intrinsic tissue‐specific contrast

Papan

Boulat

Velan

et al. 2006

Developmental Dynamics

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The amphibian embryo undergoes radical tissue transformations during blastula and gastrula stages, but live observation of internal morphogenetic events by optical microscopy is not feasible due to the opacity of the early embryo. Here, we report on the use of microscopic magnetic resonance imaging (MRI) to directly follow morphogenetic movements during blastula and gastrula stages of the Xenopus laevis embryo. We compare three different MRI modalities that take advantage of the intrinsic contrast present in embryonic tissues: three-dimensional (3D) fat-imaging, 3D water-imaging, and 2D high-speed highresolution imaging of early embryonic stages. We show that the features revealed by the intrinsic contrast correlate with the histological structure of the embryo. Using this tissue specific intrinsic contrast, the main embryonic tissues and internal tissue movements as well as archenteron invagination can be differentiated without cell labeling. We present 2D and 3D time-lapse sequences of early Xenopus embryonic development, spanning the stages from early blastula to the end of gastrula, which show the complex internal rearrangements of gastrulation in essentially real-time. Developmental Dynamics 236:494 -501, 2007.

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“…Alternatively, injection of low-molecular-weight contrast agents into the whole embryo can shorten the relaxation time T1 within the entire tissue, allowing for more signal averaging in the same amount of time and thus improving the S/N ratio (Mike Tyszka, personal communication). Furthermore, the use of a recently available micro-imaging cryoprobe may also improve the image S/N ratio (Lee et al, 2005), allowing further refinement of the image quality.…”

Section: Discussionmentioning

confidence: 99%

Time‐lapse tracing of mitotic cell divisions in the early Xenopus embryo using microscopic MRI

Papan

Boulat

Velan

et al. 2006

Developmental Dynamics

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Mitotic cell division is a highly regulated cellular event in all organisms, but its direct visualization in the vertebrates is limited to animals with transparent embryos. Here, we report on the use of microscopic magnetic resonance imaging (mMRI) to noninvasively observe mitotic cell division of early blastomeres in the optically opaque Xenopus laevis embryo. Due to intrinsic tissue contrast, cell nuclei can be directly visualized without the need for contrast enhancing labeling. By taking two-dimensional in vivo time-lapse image sequences, the karyokinesis of a blastomere is followed. Timing and orientation of the cleavages can be traced for five cell divisions to establish a cell lineage tree, including orientation and timing of the mitosis. This work demonstrates for the first time the use of MRI for the visualization of cell divisions and expands the experimental scope of the Xenopus embryo. Developmental Dynamics 235:3059 -3062, 2006.

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High-<tex>$rm T_rm c$</tex>Superconducting Receiving Coils for Nuclear Magnetic Resonance Imaging

Cited by 26 publications

References 7 publications

A 40-mm High-Temperature Superconducting Surface Resonator in a 3-T MRI System: Simulations and Measurements

A 40-mm High-Temperature Superconducting Surface Resonator in a 3-T MRI System: Simulations and Measurements

Two‐dimensional and three‐dimensional time‐lapse microscopic magnetic resonance imaging of Xenopus gastrulation movements using intrinsic tissue‐specific contrast

Time‐lapse tracing of mitotic cell divisions in the early Xenopus embryo using microscopic MRI

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