Zobrazeno 1 - 9
of 9
pro vyhledávání: '"D. M. Bussell"'
Publikováno v:
Cryogenics. 45:348-355
We describe a liquid helium cryostat, developed to cool SQUID-based receivers in low field MRI systems. The cryostat has a 4 L liquid helium capacity, a hold time of over 3 days and accommodates 10 cm diameter receiver coils. New vacuum insulation me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::765119c503d029afdb3c11ae75076193
https://doi.org/10.1016/j.cryogenics.2004.11.011
https://doi.org/10.1016/j.cryogenics.2004.11.011
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 7:3213-3216
We have developed a 4.2 K, flux locked, tuned d.c. SQUID amplifier to improve the SNR of a low field MRI system operating at 0.01 T (425 kHz). The flux locked loop, based on the Direct Offset Integration Technique, has a noise level of 2.6 /spl mu//s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f999946c44d79f99be7c5f7038db295
https://doi.org/10.1109/77.622015
https://doi.org/10.1109/77.622015
Publikováno v:
Measurement Science and Technology. 8:198-207
We describe the design and use of a 48 mm diameter, liquid-helium-cooled MRI receiver coil and DC SQUID pre-amplifier. Comparison of images of a non-conducting room temperature test object collected with the SQUID-based system and those collected wit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0055f08245554e350dc3e44dbeedaa7
https://doi.org/10.1088/0957-0233/8/2/015
https://doi.org/10.1088/0957-0233/8/2/015
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 5:3218-3221
We have used tuned receiver coils coupled to a dc SQUID preamplifier in a small scale magnetic resonance imaging (MRI) system operating at 425 kHz (B/sub 0/=0.01 T). The coil and SQUID are cooled to 4.2 K in a modified biomagnetic cryostat. The modif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b0b9649ee2ad0c87199e7c039559d537
https://doi.org/10.1109/77.403276
https://doi.org/10.1109/77.403276
Publikováno v:
Physics in Medicine and Biology. 37:2133-2138
The authors have shown that a DC SQUID with a tuned input circuit can be used as a low noise NMR preamplifier for small, room temperature samples at low field. They were interested to observe that the SQUID maintains its bias point over periods of se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92c00ea724d53b6f9fee8bed02d3cd97
https://doi.org/10.1088/0031-9155/37/11/010
https://doi.org/10.1088/0031-9155/37/11/010
Publikováno v:
Medical Physics. 24:733-735
Signal-to-noise ratios in magnetic resonance imaging are crucial in determining image quality, and dependent on a number of factors, one being the signal bandwidth per pixel. Not all manufacturers clearly state the bandwidth per pixel used for all se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::55a2a9f8c859083a0ee68d8feec8337c
https://doi.org/10.1118/1.597994
https://doi.org/10.1118/1.597994
Publikováno v:
Magnetic Resonance Imaging. 9:IV
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b91e20dfd6071afeee09037d3027f7bc
https://doi.org/10.1016/0730-725x(91)90450-z
https://doi.org/10.1016/0730-725x(91)90450-z
Autor:
John R. Mallard, David J. Lurie, D. M. Bussell, Lawrence H Bell, I. Nicholson, James M. S. Hutchison
Publikováno v:
Journal of Magnetic Resonance (1969). 84:431-437
We have recently published a new method of imaging free radicals in aqueous solutions called proton-electron double-resonance imaging (PEDRI) ( I ). In this technique a conventional proton NMR image is collected while the EPR resonance of a free radi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::edf94c5c47c8917ebc55980f2b11cd16
https://doi.org/10.1016/0022-2364(89)90392-2
https://doi.org/10.1016/0022-2364(89)90392-2
Publikováno v:
Journal of Magnetic Resonance (1969). 76:366-370
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e77db565859b96fe4e4de1dbdc3635f
https://doi.org/10.1016/0022-2364(88)90123-0
https://doi.org/10.1016/0022-2364(88)90123-0