Title :
Multirate SPAMM tagging
Author :
Ikonomidou, Vasiliki N. ; Sergiadis, George D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Aristotle Univ. of Thessaloniki, Greece
Abstract :
Many magnetic resonance tagging sequences rely on periodicity in order to produce a uniform tagging grid that covers the whole image plane. This, however, is not always desirable, since motion may be restricted to specific parts of the image, and also different motion characteristics may call for different tagging grid densities. In this paper, we present a combination of the spatial modulation of magnetization 1-1 method with selective excitation pulses that can be used in order to restrict the tagging grid only to regions of interest and produce tagging grid of different density in each region. The method is fast and easy to implement even on older or less expensive systems, since it does not require extensive gradient switching.
Keywords :
biomedical MRI; image sequences; magnetisation; medical image processing; gradient switching; magnetic resonance imaging; magnetic resonance tagging sequences; medical diagnostic imaging; motion characteristics; multirate SPAMM tagging; periodicity; regions of interest; tagging grid density; variable tagging; whole image plane; Distortion measurement; Magnetic modulators; Magnetic resonance; Magnetic resonance imaging; Magnetosphere; Motion measurement; Pulse modulation; Radio frequency; Saturation magnetization; Tagging; Algorithms; Image Enhancement; Magnetic Resonance Imaging, Cine; Motion; Phantoms, Imaging; Signal Processing, Computer-Assisted; Spin Labels;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.2003.814524