Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1997-07-11
1999-07-20
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324301, 324316, 324309, 324307, 324314, 324300, 324320, 324319, 600316, 600473, G01V 3175
Patent
active
059260211
ABSTRACT:
A magnetic resonance imaging method comprises exciting spins in an investigation volume via a radio frequency pulse and the signal produced thereby is subsequently read-out after appropriate spatial encoding following a short echo time te. Repetition of the sequence required for spatial encoding occurs in a time interval tr under appropriate variation of the spatially encoding gradient. The radio frequency pulse utilized for excitation has a short time duration and therefore a large excitation band width so that a projection image through a thick projection slice is produced under application of no slice selection gradient or with only a weak slice selection gradient. The time interval tr is sufficiently minimized that the image recording time required for recording of an image lies in the range of one EKG cycle or below. This process of recording a projection image is continuously repeated and a contrast medium bolus administered during the course of this sequential recording. The number of repetitions and therefore the length of the sequential recording is chosen in such a fashion that the dependence of the time changes of the signals from blood vessels can be observed. Selective imaging of the vessels located in an investigation volume and having contrast medium flowing therethrough is then effected through an analysis of the sequentially recorded data. In this fashion one can record projection angiograms in a measurement time of less than 1 s.
REFERENCES:
patent: 5277182 (1994-01-01), Koizumi et al.
patent: 5352979 (1994-10-01), Conturo
patent: 5422576 (1995-06-01), Kao et al.
patent: 5435303 (1995-07-01), Bernatein et al.
patent: 5479925 (1996-01-01), Dumoulin
patent: 5509412 (1996-04-01), Bahn
patent: 5517117 (1996-05-01), Mueller
patent: 5746208 (1998-05-01), Prince
Magnetic Resonance in Medicine 13, pp. 77-89 (1990): A. Haase: Snapshot Flash MRI. Applications to T1, T2, and Chemical-Shift Imaging.
Radiology 1991; 181:641-643 . Robert R. Edelman et al.: "Coronary Arteries Breath-hold MR Angiography".
Magnetic Resonance in Medicine 33; 713-719 (1995): Yi Wang et al.: "Respiratory Motion of the Heart: Kinematics and the Implications for the Spatial Resolution in Coronary Imaging".
Magnetic Resonance in Medicine 17, 126-140 (1991): D.G. Nishimura et al. "Flow-Independent Magnetic Resonance Projection Angiography".
J.F. Debatin et al.: "Contrast Enhanced 3D MR-Angiography of the Pulmonary Arteries in under 20 Seconds", Proceedings 4th Meeting ISMRM, 1996, p.161.
Arana Louis
Shrivastav Brij B.
Vincent Paul
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