Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Reexamination Certificate
2001-04-19
2003-05-13
Walberg, Teresa (Department: 3742)
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
Reexamination Certificate
active
06564082
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to medical imaging. More particularly, this invention relates to the acquisition of magnetic resonance signals and reconstruction of images from samples of the acquired signals using a Magnetic Resonance Imaging (MRI) system.
Generally, imaging using a MRI system involves imaging a volume of interest in a MRI scanner's usable volume. The usable volume is defined as a contiguous area inside the patient bore of a Magnetic Resonance scanner and it can be rather limited in size. Typically, when the usable volume fails to cover an extended object, a method for examining the whole volume containing the object employs repeated executions of positioning and imaging a fraction of the whole volume within the scanner's usable volume. A subsequent assembling operation then assembles or “stitches” the regional images together to produce a final image of the whole volume of interest. Such an approach is typically challenged by the “stitching” artifact issue in which resulting final images often suffer from distinctive artifacts at the boundaries of the “stitched” pieces. Existing techniques achieve correct combination of regional images through full spatial encoding along patient table motion direction. They minimize “stitching” artifacts by using slab selection profiles that are as rectangular as possible, and/or discarding image data near the boundaries. As a result, these techniques tend to be inflexible, require prolonged radio frequency (RF) excitation, and involve considerable acquisition efficiency degradation.
What is needed is an effective and efficient method for producing an image of a volume of interest using a MRI system, particularly with the volume of interest that extends beyond the usable volume of the MRI system. What is further needed is a method for acquiring and reconstructing, in an “incremental field of view” fashion, data sets of a volume of interest using a MRI system that relaxes the requirements of slab selection profile and spatial encoding execution.
BRIEF SUMMARY OF THE INVENTION
A method for producing an image of a volume of interest using a Magnetic Resonance Imaging (MRI) system comprising the steps of acquiring a plurality of under-sampled Magnetic Resonance (MR) data sets for a plurality of regions of the volume of interest along an axis of translation within the MRI system and reconstructing the image of the volume of interest using the respective under-sampled MR data sets.
REFERENCES:
patent: 5167232 (1992-12-01), Parker et al.
patent: 5298862 (1994-03-01), Hennig
patent: 5339035 (1994-08-01), Schneider et al.
patent: 5423315 (1995-06-01), Margosian et al.
patent: 5483158 (1996-01-01), van Heteren et al.
patent: 5517118 (1996-05-01), Crowley et al.
patent: 5617861 (1997-04-01), Ross et al.
patent: 6037771 (2000-03-01), Liu et al.
patent: 6043654 (2000-03-01), Liu et al.
patent: 6144873 (2000-11-01), Madore et al.
patent: 6181137 (2001-01-01), Havens et al.
patent: 6289232 (2001-09-01), Jakob et al.
patent: 6400151 (2002-06-01), Haase et al.
Daniel K. Sodickson, WJ. Manning., “Simultaneous Acquisition of Spatial Harmonics (Smash): Fast Imaging With Radiofrequency Coil Arrays”, MRM 38:591-603 (1997).
Klaas P. Pruessmann, M. Weiger, MB Scheiddeger, P. Boesiger, “Sense: Sensitivity Encoding for Fast MRI”, Institute of Biomedical Engineering and Medical Informatics, Univ. of Zurich and Swiss Federal Institute of Tech. Zurich, Switzerland, Jul. 9, 1999.
Ingrid Daubechies, “The Wavelet Transform, Time-Frequency Localization and Signal Analysis”, IEEE Transactions of Information Theory, vol., 36, No. 5, Sep. 1990.
Patnode Patrick K.
Robinson Daniel
Testa Jean K.
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