MR microimaging of the lung using volume projection encoding.
Journal Article (Journal Article)
Radial acquisition (RA) techniques have been extended to produce isotropic, three-dimensional images of lung in live laboratory animals at spatial resolution down to 0.013 mm3 with a signal-to-noise ratio of 30:1. The pulse sequence and reconstruction algorithm have been adapted to allow acquisition of image matrices of up to 256(3) in less than 15 min. Scan-synchronous ventilation has been incorporated to limit breathing motion artifacts. The imaging sequence permits randomizing and/or discarding selected views to minimize the consequences of breathing motion. The signal in lung parenchyma was measured as a function of flip angle (alpha) for different repetition times and found to follow the predictions for which there is an optimum excitation (Ernst) angle. A single T1 relaxation value of 780 +/- 54 ms fits all data from six guinea pigs at 2.0 T. This T1 value parameterizes the signal and allows for a priori optimization, such as calculation of the Ernst angle appropriate for lung imaging.
Full Text
Duke Authors
Cited Authors
- Shattuck, MD; Gewalt, SL; Glover, GH; Hedlund, LW; Johnson, GA
Published Date
- December 1997
Published In
Volume / Issue
- 38 / 6
Start / End Page
- 938 - 942
PubMed ID
- 9402195
International Standard Serial Number (ISSN)
- 0740-3194
Digital Object Identifier (DOI)
- 10.1002/mrm.1910380613
Language
- eng
Conference Location
- United States