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Apparatus and method for T1 NMR imaging using spin echo NMR responses elicited by initial excitation pulses of differing nutation values
Apparatus and method for T1 NMR imaging using spin echo NMR responses elicited by initial excitation pulses of differing nutation values
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机译：使用自旋回波NMR响应由不同章动值的初始激发脉冲引发的T1 NMR成像的设备和方法
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摘要
NMR response data usable to form a T1 NMR image is obtained by using constant repetition rate data acquisition cycles but wherein different initial nuclei nutation angles are employed to elicit NMR spin echo signal responses. Because of the different initial nutation angles employed to elicit the NMR responses, those responses will differ in accordance with an exponential function of the T1 spin-lattice relaxation time constant of the region under test. Once such T1-dependent data is captured, the T1 time constant may be calculated or otherwise derived (e. g. by an empirical best fit to an exponential curve of known time constant) to produce a T1 value for each incremental volume element (voxel) of the volume under test (e.g. a planar volume). In this manner a visual image of the T1 NMR parameter is created when the complete array of derived T1 values is converted to gray-scale (or color) values and displayed as corresponding picture elements (pixels) in a raster-scanned CRT display or the like. Such an approach may provide a significant speed improvement in the overall data acquisition time required to derive a T1 NMR image. Such speed improvements may be especially useful where large numbers of multiple slices through the object under test are being examined.
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