| Publikationstyp: | Beitrag in wissenschaftlicher Zeitschrift |
| Art der Begutachtung: | Peer review (Publikation) |
| Titel: | Symmetrically biased T/R switches for NMR and MRI with microsecond dead time |
| Autor/-in: | Brunner, David O. Furrer, Lukas Weiger, Markus Baumberger, Werner Schmid, Thomas Reber, Jonas Dietrich, Benjamin E. Wilm, Bertram J. Froidevaux, Romain Pruessmann, Klaas P. |
| DOI: | 10.1016/j.jmr.2015.12.016 |
| Erschienen in: | Journal of Magnetic Resonance |
| Band(Heft): | 263 |
| Seite(n): | 147 |
| Seiten bis: | 155 |
| Erscheinungsdatum: | 2016 |
| Verlag / Hrsg. Institution: | Elsevier |
| ISSN: | 1090-7807 1096-0856 |
| Sprache: | Englisch |
| Schlagwörter: | Dead time reduction; Short; TR switching; Zero echo time imaging |
| Fachgebiet (DDC): | 530: Physik |
| Zusammenfassung: | For direct NMR detection and imaging of compounds with very short coherence life times the dead time between radio-frequency (RF) pulse and reception of the free induction decay (FID) is a major limiting factor. It is typically dominated by the transient and recovery times of currently available transmit-receive (T/R) switches and amplification chains. A novel PIN diode-based T/R switch topology is introduced allowing for fast switching by high bias transient currents but nevertheless producing a very low video leakage signal and insertion loss (0.5dB). The low transient spike level in conjunction with the high isolation (75dB) prevent saturation of the preamplifier entirely which consequently does not require time for recovery. Switching between transmission and reception is demonstrated within less than 1μs in bench tests as well as in acquisitions of FIDs and zero echo time (ZTE) images with bandwidths up to 500kHz at 7T. Thereby the 2kW switch exhibited a rise-time of 350ns (10-99%) producing however a total video leakage of below 20mV peak-to-peak and less than -89dBm in-band. The achieved switching time renders the RF pulse itself the dominant contribution to the dead time in which a coherence cannot be observed, thus making pulsed NMR experiments almost time-optimal even for compounds with very short signal life times. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/15251 |
| Volltext Version: | Publizierte Version |
| Lizenz (gemäss Verlagsvertrag): | Lizenz gemäss Verlagsvertrag |
| Departement: | School of Engineering |
| Organisationseinheit: | Institute of Signal Processing and Wireless Communications (ISC) |
| Enthalten in den Sammlungen: | Publikationen School of Engineering |
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Brunner, D. O., Furrer, L., Weiger, M., Baumberger, W., Schmid, T., Reber, J., Dietrich, B. E., Wilm, B. J., Froidevaux, R., & Pruessmann, K. P. (2016). Symmetrically biased T/R switches for NMR and MRI with microsecond dead time. Journal of Magnetic Resonance, 263, 147–155. https://doi.org/10.1016/j.jmr.2015.12.016
Brunner, D.O. et al. (2016) ‘Symmetrically biased T/R switches for NMR and MRI with microsecond dead time’, Journal of Magnetic Resonance, 263, pp. 147–155. Available at: https://doi.org/10.1016/j.jmr.2015.12.016.
D. O. Brunner et al., “Symmetrically biased T/R switches for NMR and MRI with microsecond dead time,” Journal of Magnetic Resonance, vol. 263, pp. 147–155, 2016, doi: 10.1016/j.jmr.2015.12.016.
BRUNNER, David O., Lukas FURRER, Markus WEIGER, Werner BAUMBERGER, Thomas SCHMID, Jonas REBER, Benjamin E. DIETRICH, Bertram J. WILM, Romain FROIDEVAUX und Klaas P. PRUESSMANN, 2016. Symmetrically biased T/R switches for NMR and MRI with microsecond dead time. Journal of Magnetic Resonance. 2016. Bd. 263, S. 147–155. DOI 10.1016/j.jmr.2015.12.016
Brunner, David O., Lukas Furrer, Markus Weiger, Werner Baumberger, Thomas Schmid, Jonas Reber, Benjamin E. Dietrich, Bertram J. Wilm, Romain Froidevaux, and Klaas P. Pruessmann. 2016. “Symmetrically Biased T/R Switches for NMR and MRI with Microsecond Dead Time.” Journal of Magnetic Resonance 263: 147–55. https://doi.org/10.1016/j.jmr.2015.12.016.
Brunner, David O., et al. “Symmetrically Biased T/R Switches for NMR and MRI with Microsecond Dead Time.” Journal of Magnetic Resonance, vol. 263, 2016, pp. 147–55, https://doi.org/10.1016/j.jmr.2015.12.016.
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