MAGNETIC-SUSCEPTIBILITY EFFECTS IN IMAGING - DISTORTION-FREE IMAGES OF PLANT-TISSUE IN SOIL

被引：18

作者：

KINCHESH, P

RANDALL, EW

ZICK, K

机构：

[1] Chemistry Department, Queen Mary and Westfield College, London

[2] Bruker Analytische Messtechnik GMBH

来源：

MAGNETIC RESONANCE IMAGING | 1994年 / 12卷 / 02期

关键词：

NMR IMAGING; STRAY FIELD IMAGING; STRAFI; MAGNETIC SUSCEPTIBILITY; SOIL; PLANT TISSUE;

D O I：

10.1016/0730-725X(94)91542-3

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：

Magnetic susceptibility effects (MSE) in NMR spectra are well known, and indeed the NMR technique has frequently been applied to measure magnetic susceptibility. In the case of imaging, MSE can lead to image distortion when the sample is heterogeneous. We have performed experiments on a soil sample (iron content approximate to 2%) containing plant tissue which gave a NMR signal that was spread over about 15 kHz in the H-1 spectrum. We present some results from a 128 x 128 x 128 3D H-1 image (voxel size = 150 x 150 x 150 mu m(3)) generated by the stray field imaging (STRAFI) technique in which the use of a 5 kG cm(-1) magnetic flux density gradient reduced the magnetic susceptibility distortion to less than 10 mu m.

引用

页码：305 / 307

页数：3

共 9 条

[1]

Rogers, Bottomley, In situ nuclear magnetic resonance imaging of roots Influence of soil type ferromagnetic particle content and soil water, Agronomy Journal, 79, pp. 957-965, (1987)

[2]

Tollner, Verma, Malko, Shuman, Cheshire, Effect of soil total iron on magnetic resonance image quality, Communications in Soil Science and Plant Analysis, 22, pp. 1941-1948, (1991)

[3]

Brown, Pratum, Bledsoe, Ford, Cothern, Perry, Noninvasive studies of conifer roots Nuclear magnetic resonance (NMR) imaging of Douglas-fir seedlings, Canadian Journal of Forest Research, 21, pp. 1559-1566, (1991)

[4]

Kinchesh, Randall, Zick, The elimination of magnetic distortions in the imaging of liquids in solids: The stray field imaging technique, J. Magn. Reson., 100, pp. 411-415, (1992)

[5]

Samoilenko, Artemov, Sibeldina, Application of NMR imaging to the investigation of the solid state, Bruker Rep., 2, pp. 30-31, (1987)

[6]

Samoilenko, Artemov, Sibeldina, Formation of sensitive layer in experiments on NMR subsurface imaging of solids, JETP Lett., 47, pp. 417-419, (1988)

[7]

Samoilenko, Zick, Stray-field imaging of solids (STRAFI), Bruker Rep., 1, pp. 40-41, (1990)

[8]

Callaghan, Principles of Nuclear Magnetic Resonance Microscopy, (1991)

[9]

Miller, Garroway, Removal of static field inhomogeneity and chemical-shift effects in NMR imaging, J. Magn. Reson., 67, pp. 575-579, (1986)

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