High-T/sub c/ superconducting surface coil for 2 tesla magnetic resonance imaging of small animals

Wosik, J.; Wang, F.; Xie, Lei; Strikovski, M.; Kamel, M.; Nesteruk, K.; Bilgen, Mehmet; Narayana, Ponnada A.

doi:10.1109/77.919436

Cited by 15 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with HTS coils [9][10][11][12], LN 2 cooled coils provide the advantages of simpler array construction and flexible three-dimensional shapes for volumetric coverage. Although flexible HTS tapes/wires have also been used for RF coils, their superconducting properties degrade rapidly in a high magnetic field [1].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

In vivo MRI using liquid nitrogen cooled phased array coil at 3.0 T

Kwok

You

2006

Magnetic Resonance Imaging

View full text Add to dashboard Cite

A liquid nitrogen (LN 2 ) cooled dual-channel array coil was designed and built for use on a 3.0-T whole-body scanner. In vivo imaging of a volunteer's fingers and imaging of a deceased mouse and oil phantom were performed using the LN 2 cooled array and a similar room-temperature coil. Imaging results showed that the LN 2 cooled array provides a signal-to-noise ratio gain of up to 240% as compared with its room-temperature counterpart. LN 2 cooled arrays may be useful for highresolution clinical imaging of joints, skin, eyes and peripheral vessels as well as for biomedical imaging of small animals in human disease modeling.

show abstract

Section: Discussionmentioning

confidence: 99%

“…The y include copper coils cooled to liquid nitrogen (LN 2 ) temperature (77 K) [1][2][3][4][5][6] or to liquid helium temperat ure (4.2 K) [7,8] and hightemperature superconducting (HTS) coils [9][10][11][12]. Cryogenic cooling reduces RF coil noise through the lowering of coil resistance (R C ) and coil temperature.…”

Section: Introductionmentioning

confidence: 99%

In vivo MRI using liquid nitrogen cooled phased array coil at 3.0 T

Kwok

You

2006

Magnetic Resonance Imaging

View full text Add to dashboard Cite

show abstract

“…The discovery and development of high-temperature superconducting (HTS) materials has resulted in several attempts to build practical probes with improved SNR. Indeed, preliminary studies have shown that for selected applications where the MRI system noise is in the coil loss regime (low-field MRI, highfield microscopy, and small-volume MRI) HTS MRI receiver coils perform significantly better than comparable copper coils [4]- [7].…”

Section: Introductionmentioning

confidence: 99%

Superconducting single and phased-array probes for clinical and research MRI

Wosik

Xie

Nesteruk

et al. 2003

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Significant improvement of the signal-to-noise ratio (SNR for magnetic resonance imaging (MRI) applications, in which the thermal noise of the rf receiver probe dominates the system noise can be achieved by cooling down a normal metal probe or by using superconductors. In this work, the SNR enhancement expected from using superconductors for single coil and/or phased array designs are calculated, discussed and compared with some experimental results. We also report on the design and fabrication of a 63.8 MHz probe (1.5 Tesla) consisting of patterned, copper or YBCO films deposited on both sides on a 5 cm LaAlO 3 substrate. The unloaded of the normal metal probe at room temperature and at 77 K was about 400 and 1000, respectively, while the YBCO probe exhibited a of 40 000 at 77 K. Five-cm diameter probes cooled to 77 K were superior to their identically designed room temperature equivalents, and provided SNR gains at 1.5 Tesla of 3 and 2 times for YBCO and cooled normal metal, respectively. The application of superconducting coils in conjunction with recently developed techniques for significant reduction of MRI acquisition times by using parallel processing with phased array probes is discussed.

show abstract

“…Compared with the GE pulse sequence, the SE image protocol requires uniform tip angle to achieve 180 degree magnetisation inversion. Therefore the SE pulse is rarely adopted by other cryogenic coil techniques [26].…”

Section: K)mentioning

confidence: 99%

A Novel Receive-Only Liquid Nitrogen ($\hbox{LN}_{2}$ )-Cooled RF Coil for High-Resolution In Vivo Imaging on a 3-Tesla Whole-Body Scanner

Varma

Randell

et al. 2012

IEEE Trans. Instrum. Meas.

View full text Add to dashboard Cite

A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Thomas's Hospital, Kings College, London; 3 Pulseteq Ltd., Wotton-under-Edge, Gloucestershire. Abstract:The design and operation of a receive-only liquid nitrogen (LN 2 ) cooled coil and cryostat suitable for medical image on 3T whole body MR scanner is presented. The coil size, optimised for murine imaging, was determined by using electromagnetic (EM) simulations. This process is therefore easier and more cost-effective than building a range of coils. A non-magnetic cryostat suitable for small animal imaging was developed having a good vacuum and cryogenic temperature performance. The cooled probe had an active detuning circuit allowing use with the scanner's built-in body coil. External tuning and matching was adopted to allow for changes to the coil due to temperature and loading. The performance of the probe was evaluated by comparison of signalto-noise (SNR) performance with the same radio-frequency (RF) coil operating at room temperature (RT). The performance of the RF coil at RT was also benchmarked against a commercial surface coil with similar dimensions to ensure a fair SNR comparison. The cryogenic coil achieved a 1.6 -2 fold SNR gain for several different medical image applications: For the mouse brain image, a 100 μm resolution was achieved in an imaging time of 3 minutes with an SNR of 25-40, revealing finer anatomical details unseen at lower resolution in the same time. For other heavy loading condition, such as hind legs and liver, the SNR enhancement was slightly reduced to 1.6 fold. The observed SNR was in good agreement with the expected SNR gain correlated to the loaded quality factor of RF coils from EM simulations. With the aid of this enduser friendly and economically attractive cryogenic RF coil, the enhanced SNR available can be used to improve resolution or reduce time of individual scans in a number of biomedical applications.Introduction:

show abstract

High-T/sub c/ superconducting surface coil for 2 tesla magnetic resonance imaging of small animals

Cited by 15 publications

References 11 publications

In vivo MRI using liquid nitrogen cooled phased array coil at 3.0 T

In vivo MRI using liquid nitrogen cooled phased array coil at 3.0 T

Superconducting single and phased-array probes for clinical and research MRI

A Novel Receive-Only Liquid Nitrogen ($\hbox{LN}_{2}$ )-Cooled RF Coil for High-Resolution In Vivo Imaging on a 3-Tesla Whole-Body Scanner

Contact Info

Product

Resources

About