Three-dimensional magnetic resonance imaging
DCFirst Claim
1. In a method for producing a set of magnetic resonance three-dimensional image data, a preparation-acquisition-recovery pulse sequence cycle comprising the steps of:
- a--a magnetization preparation period in which a series of at least one of RF pulses, gradient field pulses, and time delays are applied to encode the desired contrast properties in the form of longitudinal magnetization,b--a data acquisition period, said data acquisition period including at least two repetitions of a gradient echo sequence to acquire data for a fraction of k-space,c--a magnetization recovery period which allows T1 and T2 relaxation before the start of the next sequence cycle, andd--repeating steps a, b and c until a predetermined k-space volume is sampled.
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Abstract
A new three-dimensional (3D) MR imaging pulse sequence can produce over 100 high-resolution, high-contrast images in as little as 6 minutes of imaging time. Without additional imaging time, this same image data can be post-processed to yield high-resolution, high-contrast images in any arbitrary orientation. Thus, this new pulse sequence technique provides detailed yet comprehensive coverage. The method of this invention relates to a preparation-acquisition-recovery sequence cycle. The first step is magnetization preparation (MP) period. The MP period can emply a series of RF pulses, gradient field pulses, and/or time delays to encode the desired contrast properties in the form of longitudinal magnetization. A data acquisition period includes at least two repetitions of a gradient echo sequence to acquire data for a fraction of k-space. A magnetization recovery period is provided which allows T1 and T2 relaxation before the start of the next sequence cycle. The MP, data acquisition and magnetization recovery steps are repeated until a predetermined k-space volume is sampled.
175 Citations
44 Claims
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1. In a method for producing a set of magnetic resonance three-dimensional image data, a preparation-acquisition-recovery pulse sequence cycle comprising the steps of:
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a--a magnetization preparation period in which a series of at least one of RF pulses, gradient field pulses, and time delays are applied to encode the desired contrast properties in the form of longitudinal magnetization, b--a data acquisition period, said data acquisition period including at least two repetitions of a gradient echo sequence to acquire data for a fraction of k-space, c--a magnetization recovery period which allows T1 and T2 relaxation before the start of the next sequence cycle, and d--repeating steps a, b and c until a predetermined k-space volume is sampled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification