Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Alun J. Lucas"'
Autor:
Richard Bowtell, Alun J. Lucas, R. C. Hawkes, Michael Poole, Dan Green, Simon Pittard, Adrian Carpenter
Publikováno v:
Magnetic Resonance in Medicine. 62:1106-1111
Combining positron emission tomography (PET) and MRI necessarily involves an engineering tradeoff as the equipment needed for the two modalities vies for the space closest to the region where the signals originate. In one recently described scanner c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90582c8cfaf8e7e6ea9c5c1eb0b33070
https://doi.org/10.1002/mrm.22143
https://doi.org/10.1002/mrm.22143
Publikováno v:
Journal of Magnetic Resonance, Series A. 118:214-220
A compact model, the modified stretched exponential (MSE), for characterization of transverse and longitudinal NMR relaxation of fluid in saturated porous media is presented. The MSE model exhibits the theoretically correct long- and short-time behav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6986d9aa97eb9ac2870145f7c0b93040
https://doi.org/10.1006/jmra.1996.0029
https://doi.org/10.1006/jmra.1996.0029
Autor:
Laurance D. Hall, Robert Charles. Stewart, D.W. Phelps, M. Peyron, Alun J. Lucas, G.F. Potter, Gregory K. Pierens
Publikováno v:
Magnetic Resonance Imaging. 12:295-298
The simple pulse-acquire experiment has been used to evaluate the level of accuracy and precision achievable in NMR fluid saturation measurements for a range of rock core samples saturated with either brine or hydrocarbons. For a set of more than 70
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19a7b231447327553e37d772b9a24427
https://doi.org/10.1016/0730-725x(94)91539-3
https://doi.org/10.1016/0730-725x(94)91539-3
Publikováno v:
Journal of Magnetic Resonance, Series A. 104:273-282
Problems associated with large, static magnetic-field gradients are reviewed and illustrated with pulsed-field-gradient NMR diffusion-imaging experiments on two model systems. The model systems chosen are a water-filled cylinder and a water-filled an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a1312935e61e0ee54b17baee9f692d7
https://doi.org/10.1006/jmra.1993.1224
https://doi.org/10.1006/jmra.1993.1224
Autor:
Tim D. Fryer, R. C. Hawkes, Richard E. Ansorge, Stefan Siegel, Alun J. Lucas, T. Adrian Carpenter, John C. Clark
Publikováno v:
2008 IEEE Nuclear Science Symposium Conference Record.
This work is an initial evaluation of the performance of a microPET Focus-Fl20 system modified to fit in the split in a 1 Tesla MR imaging system to create a rodent scanner capable of simultaneous PET and MR acquisition. The MR imager is a novel desi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8412ab36a23dbcc17bce18a31cdffb46
https://doi.org/10.1109/nssmic.2008.4774113
https://doi.org/10.1109/nssmic.2008.4774113
Autor:
John C. Clark, Richard E. Ansorge, Tim D. Fryer, Alun J. Lucas, R. C. Hawkes, T. Adrian Carpenter
Publikováno v:
2008 IEEE Nuclear Science Symposium Conference Record.
We present EM reconstructions using polar voxels and real data from a modified microPET Focus 120 small animal PET scanner. The reconstruction is based on a complete Monte Carlo generated system matrix that is stored in memory. Details of the impleme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f8e0e0db356907af200fdd431fb96277
https://doi.org/10.1109/nssmic.2008.4774186
https://doi.org/10.1109/nssmic.2008.4774186
Autor:
Joseph Stevick, A. Del Guerra, R. C. Hawkes, Alun J. Lucas, Gabriela Llosa, T. A. Carpenter, Claudio Piemonte, Sara Marcatili
Publikováno v:
2007 IEEE Nuclear Science Symposium Conference Record.
We are investigating the performance of silicon photomultipliers (SiPM) in a magnetic resonance imaging (MRI) environment with a view to exploiting the potential advantages in a combined positron emission tomography / magnetic resonance imaging (PET/
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd0c6be41ab365dda638e2fb1c6fafc0
https://doi.org/10.1109/nssmic.2007.4436860
https://doi.org/10.1109/nssmic.2007.4436860
Autor:
John C. Clark, Richard E. Ansorge, Guy B. Williams, Alun J. Lucas, R. C. Hawkes, T. A. Carpenter, Tim D. Fryer, Robert E. Nutt
Publikováno v:
2006 IEEE Nuclear Science Symposium Conference Record.
As evidenced by the success of PET-CT, there are many benefits from combining imaging modalities into a single scanner. The combination of PET and MR offers potential advantages over PET-CT, including improved soft tissue contrast, access to the mult
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93dee0e23f08e98f217b8580b064f94a
https://doi.org/10.1109/nssmic.2006.354384
https://doi.org/10.1109/nssmic.2006.354384
Autor:
M. Peyron, Alun J. Lucas, Robert Charles. Stewart, S.J. Gibbs, D.W. Phelps, Laurance D. Hall, Gregory K. Pierens
Publikováno v:
Magnetic Resonance Imaging. 12:249-251
Studies of echo attenuation at long diffusion times in pulsed field gradient NMR experiments on a variety of rock core samples are interpreted in the light of recent theoretical analysis of the effect of pore geometry and surface relaxation. This stu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbede54d0054b6e3f012d0e7584172fb
https://doi.org/10.1016/0730-725x(94)91529-6
https://doi.org/10.1016/0730-725x(94)91529-6
Autor:
Laurance D. Hall, M. Peyron, Alun J. Lucas, Robert Charles. Stewart, T. A. Carpenter, Gregory K. Pierens, G.F. Potter, D.W. Phelps
Publikováno v:
Magnetic resonance imaging. 12(2)
A technique for obtaining quantitative longitudinal saturation/porosity profiles of rock cores which are longer than the NMR coil has been developed. The slice-selected experiment uses a prefocused pulse in conjunction with a magnetic field gradient
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae688c12faa9f559340cb5d0d974a57c
https://pubmed.ncbi.nlm.nih.gov/8170330
https://pubmed.ncbi.nlm.nih.gov/8170330