Abstract
A magnetic resonance imaging sequence that generates a high-density grid pattern of tags is discussed. This sequence is similar to the spatial modulation of magnetization (SPAMM) technique described by L. Axel and L. Dougherty (1989), which utilizes binomial RF pulses interspersed with pulsed gradients. In the sequence described, the tag placement occurs by exciting the sample with a DANTE pulse sequence in the presence of a continuous frequency encoding gradient. This results in a set of thin parallel lines whose separation can be controlled by varying either the Dante delay or the gradient strength. The tagging sequence requires less than 10 ms to define a cross-sectional grid. By alternating the phase of the DANTE pulses between 0° and 180°, excitation occurs at four different frequencies, thereby quadrupling the number of tags. The use of a DANTE pulse train provides better frequency selectivity and reduces the bandwidth limitation of the longer binomial pulses. This results in thinner, more uniform tag placement in less time.
| Original language | English (US) |
|---|---|
| Pages | 71 |
| Number of pages | 1 |
| State | Published - 1990 |
| Event | Proceedings of the Sixteenth Annual Northeast Bioengineering Conference - University Park, PA, USA Duration: Mar 26 1990 → Mar 27 1990 |
Other
| Other | Proceedings of the Sixteenth Annual Northeast Bioengineering Conference |
|---|---|
| City | University Park, PA, USA |
| Period | 3/26/90 → 3/27/90 |
All Science Journal Classification (ASJC) codes
- General Chemical Engineering