Abstract: In an improved INEPT pulse sequence, an excitation pulse, a refocus pulse and an excitation pulse are sequentially applied for .sup.1 H spins. A refocus pulse and an excitation pulse are sequentially applied for .sup.13 C spins that are spin-spin coupled with the .sup.1 H spins. A magnetic resonance signal is acquired from .sup.1 H spins or .sup.13 C spins. The second refocus pulse for .sup.1 H is applied as a slice selective pulse at a time different from the time the first refocus pulse for .sup.13 C is applied. This allows localization to be achieved without adversely affecting the flip angle of the first refocus pulse for .sup.13 C.

Abstract: In an improved INEPT pulse sequence, an excitation pulse, a refocus pulse and an excitation pulse are sequentially applied for .sup.1 H spins. A refocus pulse and an excitation pulse are sequentially applied for .sup.13 C spins that are spin--spin coupled with the .sup.1 H spins. A magnetic resonance signal is acquired from .sup.1 H spins or .sup.13 C spins. The second refocus pulse for .sup.1 H is applied as a slice selective pulse at a time different from the time the first refocus pulse for .sup.13 C is applied. This allows localization to be achieved without adversely affecting the flip angle of the first refocus pulse for .sup.13 C.

Abstract: In an improved INEPT pulse sequence, an excitation pulse, a refocus pulse and an excitation pulse are sequentially applied for .sup.1 H spins. A refocus pulse and an excitation pulse are sequentially applied for .sup.13 C spins that are spin-spin coupled with the .sup.1 H spins. A magnetic resonance signal is acquired from .sup.1 H spins or .sup.13 C spins. The second refocus pulse for .sup.1 H is applied as a slice selective pulse at a time different from the time the first refocus pulse for .sup.13 C is applied. This allows localization to be achieved without adversely affecting the flip angle of the first refocus pulse for .sup.13 C.

Abstract: Fast magnetic resonance imaging uses combined gradient echoes and spin echoes. In each of one or more TR intervals, after an initial NMR RF nutation pulse, a sequence of 180.degree. RF nutation pulses is used to refocus the RF response into corresponding string of spin echoes. However, in addition, during the time that such spin echo would normally occur after each such 180.degree. RF nutation pulse, a plurality of alternating polarity read-out magnetic gradient pulses is utilized so as to very rapidly form .a sub-sequence of gradient echoes. This fast multi-section MRI sequence utilizes the speed advantages of gradient refocusing while overcoming the image artifacts arising from static field homogeneity and chemical shift. Image contrast is still determined by the T2 contrast in Hahn spin echoes. A novel k-space trajectory temporally modulates signals and demodulates artifacts.

Abstract: Fast magnetic resonance imaging uses combined gradient echoes and spin echoes. In each of one or more TR intervals, after an initial NMR RF nutation pulse, a sequence of 180.degree. RF nutation pulses is used to refocus the RF response into corresponding string of spin echoes. However, in addition, during the time that such spin echo would normally occur after each such 180.degree. RF nutation pulse, a plurality of alternating polarity read-out magnetic gradient pulses is utilized so as to very rapidly form a sub-sequence of gradient echoes. This fast multi-section MRI sequence utilizes the speed advantages of gradient refocusing while overcoming the image artifacts arising from static field homogeneity and chemical shift. Image contrast is still determined by the T2 contrast in Hahn spin echoes. A novel k-space trajectory temporally modulates signals and demodulates artifacts.