Four- and eight-echo diagonal interleaved echo planar scanning

George C. Kashmar; Orhan Nalcioglu

doi:10.1117/12.18793

1 July 1990 Four- and eight-echo diagonal interleaved echo planar scanning

George C. Kashmar, Orhan Nalcioglu

Proceedings Volume 1231, Medical Imaging IV: Image Formation; (1990) https://doi.org/10.1117/12.18793
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

Head and body size images are discussed which were made by collecting four or eight data space lines per TR period. The images have a standard clinical number of pixels (128 x 256) and were made with no data averaging. The lines of data in the data space were collected along diagonal Cartesian echo planar trajectories. In this type of scanning, the main source of error is known to be the inhomogeneity of the main field. Phase angles caused by inhomogeneity can largely be eliminated and scanning speed increased by using the half Fourier method with full Fourier phase maps, but one phase map is required for each echo. To prevent having a speed increase only in scans taking longer than 10 seconds, some attention to GRASS and/or FLASH technology is also required. In addition, the method can be applied to directly to FLASH/GRASS as is demonstrated by a two echo GRASS scan. Fastest image time was 1.9 seconds.

Citation Download Citation

George C. Kashmar and Orhan Nalcioglu "Four- and eight-echo diagonal interleaved echo planar scanning", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); https://doi.org/10.1117/12.18793

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