Self-Refocused Spatial-Spectral Pulse for Positive Contrast Imaging of Cells Labeled with SPIO Nanoparticles

被引:26
作者
Balchandani, Priti [1 ]
Yamada, Mayumi
Pauly, John [2 ]
Yang, Phillip
Spielman, Daniel
机构
[1] Stanford Univ, Lucas Ctr MR Spect, Dept Radiol, Stanford, CA 94305 USA
[2] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA
关键词
self-refocused; slice-selective; RF pulse; positive contrast; SPIO; cell-tracking; short-echo; IN-VIVO TRACKING; STEM-CELLS; MAGNETIC NANOPARTICLES; SELECTIVE EXCITATION; IRON; MRI; VISUALIZATION; FERUMOXIDES; RECOVERY; FLAPS;
D O I
10.1002/mrm.21973
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
MRI has been used extensively to noninvasively track the location of cells labeled with superparamagnetic iron-oxide nanoparticles (SPIOs) in vivo. Typically, SPIOs are employed as a negative contrast agent which makes it difficult to differentiate labeled cells from extraneous sources of inhomogeneity and actual voids in the image. As a result, several novel approaches have been put forth to obtain positive contrast from SPIOs. One technique proposed by Cunningham et al. utilizes spectrally selective pulses to excite and refocus spins in the vicinity of the SPIOs. Although the frequency selectivity of this technique provides effective positive contrast, the lack of slice selectivity results in interfering signal from sources of off-resonance outside the slice of interest. We have developed a self-refocused spatial-spectral (SR-SPSP) pulse to achieve slice-selective spin-echo imaging of off-resonant spins. Using a self-refocused pulse affords flexibility in echo-time selection since the spin echo may be placed at any time after the end of the pulse. The spatial selectivity achieved by the SR-SPSP RF pulse eliminates background signal from out-of-slice regions and reduces the on-resonant water suppression requirements. Phantom and in vivo data demonstrate that positive contrast and slice-selectivity are achieved using this novel RF pulse. Magn Reson Med 62:183-192, 2009. (C) 2009 Wiley-Liss, Inc.
引用
收藏
页码:183 / 192
页数:10
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