Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2009-04-16
2011-12-13
Arana, Louis (Department: 2858)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S309000
Reexamination Certificate
active
08076936
ABSTRACT:
Provided are methods and systems for rapid MRI imaging-scanning that provides 2D or 3D coverage, high precision, and high-temporal efficiency, without exceeding SAR limits. In one embodiment, a pulse sequence process is performed that includes a T1ρpreparation period, followed by a very rapid image acquisition process, which acquires multiple lines of k-space data. The combination of T1ρpreparation and acquisition of multiple lines of k-space, allows scan times to be shortened by as much as 3- or 4-fold or more, over conventional MRI scanning methods.
REFERENCES:
patent: 5245282 (1993-09-01), Mugler
patent: 5786693 (1998-07-01), Gullapalli
patent: 6836114 (2004-12-01), Reddy
patent: 6885193 (2005-04-01), Foxall
patent: 7064545 (2006-06-01), Zaharchuk et al.
patent: 7116104 (2006-10-01), Reddy et al.
patent: 7596252 (2009-09-01), Hasselberg
Borthakur, et al. “Three-dimensional T1r-weighted MRI at 1.5 Tesla.” J Magn Reson Imaging 17(6):730-736 (2003).
Borthakur, et al. “In vivo measurement of T1rho dispersion in the human brain at 1.5 tesla.” J Magn Reson Imaging 19(4):403-409 (2004).
Borthakur, et al. “A pulse sequence for rapid in vivo spin-locked MRI.” J Magn Reson Imaging 23(4):591-596 (2006).
Charagundla, et al. “Off-resonance proton T1r dispersion imaging of 17O-enriched tissue phantoms.” Magn Reson Med 39(4):588-595 (1998).
Dixon, et al. “Myocardial suppression in vivo by spin locking with composite pulses.” Magn Reson Med 36(1):90-94 (1996).
Duvvuri, et al.Human knee: in vivo TI(rho)-weighted MR imaging at 1.5 T-preliminary experience. Radiology 220 (3):822-826 (2001).
Grohn, et al. “Early detection of irreversible cerebral ischemia in the rat using dispersion of the magnetic resonance imaging relaxation time, T1rho.” J Cereb Blood Flow Metab 20(10): 1457-1466 (2000).
Hulvershorn, et al. “T1rho contrast in functional magnetic resonance imaging.” Magn Reson Med 54(5): 1155-1162 (2005).
Johannessen, et al. “Assessment of human disc degeneration and proteoglycan content using T1rho-weighted magnetic resonance imaging.” Spine 31(11): 1253-1257 (2006).
Lamminen, et al. “T1rho dispersion imaging of diseased muscle tissue.” Br J Radiol 66(789):783-787 (1993).
Li, et al. “In vivo 3T spiral imaging based multi-slice T(1rho) mapping of knee cartilage in osteoarthritis.” Magn Reson Med 54(4):929-936 (2005).
Markkola, et al. “T1rho dispersion imaging of head and neck tumors: a comparison to spin lock and magnetization transfer techniques.” J Magn Reson Imaging 7(5):873-879 (1997).
Mlyarnik, et al. “The role of relaxation times in monitoring proteoglycan depletion in articular cartilage.” J Magn Reson Imaging 10(4):497-502 (1999).
Poptani, et al. “T1rho imaging of murine brain tumors at 4 T.” Acad Radiol 8(1):42-47 (2001).
Santyr, et al. “Spin locking for magnetic resonance imaging with application to human breast.” Magn Reson Med 12(1):25-37 (1989).
Scheffler, et al. “Principles and applications of balanced SSFP techniques.” Eur. Radiol. 13:2409-2418 (2003).
Schmitz, et al. “Three-dimensional true FISP for high-resolution imaging of the whole brain”. Eur Radiol 13 (7):1577-1582 (2003).
Wheaton, et al. “Correlation of T1rho with fixed charge density in cartilage.” J Magn Reson Imaging 20 (3):519-525 (2004).
Wheaton, et al. “Pulse sequence for multislice T1rho-weighted MRI.” Magn Reson Med 51(2):362-369 (2004).
Witschey, et al. “Artifactis in T1rho weighted imaging: Compensation for B1 and B0 field imperfections.” JMR 186:75-85 (2007).
Borthakur Ari
Charagundla Sridhar
Charagundla, legal representative Jyothsna
Reddy Ravinder
Arana Louis
McConathy Evelyn H.
Montgomery, McCracken, Walker & Rhoads LLP
The Trustees of the University of Pennsylvania
LandOfFree
Reducing imaging-scan times for MRI systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reducing imaging-scan times for MRI systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reducing imaging-scan times for MRI systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4269229