CONTACTLESS IMPEDANCE MEASUREMENT BY MAGNETIC INDUCTION - A POSSIBLE METHOD FOR INVESTIGATION OF BRAIN IMPEDANCE

被引：43

作者：

NETZ, J ^{[1
]}

FORNER, E ^{[1
]}

HAAGEMANN, S ^{[1
]}

机构：

[1] BERG UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH ELECTROTECH 13,W-5600 WUPPERTAL 1,GERMANY

来源：

PHYSIOLOGICAL MEASUREMENT | 1993年 / 14卷 / 04期

关键词：

D O I：

10.1088/0967-3334/14/4/007

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Using a primary coil that induces eddy currents in a volume conductor, and a pair of secondary coils configured to form a differential transformer, it is possible to measure the conductivity of a volume conductor by the magnetic fields of the induced eddy currents. This method is especially favourable for measuring impedance of the brain, as the low conductance of the surrounding skull interferes only very slightly with the measuring process. In a simulation experiment a life-size skull model was filled with NaCl solutions of different concentrations in each half, so as to model the impedances of a normal and an oedematous hemisphere. The impedance differences could be clearly detected by a coil system of 25 mm diameter.

引用

页码：463 / 471

页数：9

共 19 条

[1] IMPEDANCE CHANGES IN CEREBRAL TISSUE ACCOMPANYING A LEARNED DISCRIMINATIVE PERFORMANCE IN CAT [J].

ADEY, WR ;

KADO, RT ;

DIDIO, J ;

SCHINDLER, WJ .

EXPERIMENTAL NEUROLOGY, 1963, 7 (04) :259-&

[2] PROTON NMR IMAGING IN EXPERIMENTAL ISCHEMIC INFARCTION [J].

BUONANNO, FS ;

PYKETT, IL ;

BRADY, TJ ;

VIELMA, J ;

BURT, CT ;

GOLDMAN, MR ;

HINSHAW, WS ;

POHOST, GM ;

KISTLER, JP .

STROKE, 1983, 14 (02) :178-184

[3]

EDER G, 1967, ELEKTRODYNAMIK

[4]

ELAZAR Z., 1966, EPILEPSIA, V7, P291, DOI 10.1111/j.1528-1157.1966.tb03809.x

[5] SOME RELATIONS BETWEEN RESISTIVITY AND ELECTRICAL ACTIVITY IN THE CEREBRAL CORTEX OF THE CAT [J].

FREYGANG, WH ;

LANDAU, WM .

JOURNAL OF CELLULAR AND COMPARATIVE PHYSIOLOGY, 1955, 45 (03) :377-392

[6]

Go K G, 1972, Acta Neurochir (Wien), V27, P113, DOI 10.1007/BF01401876

[7]

Holder D S, 1988, Clin Phys Physiol Meas, V9 Suppl A, P111, DOI 10.1088/0143-0815/9/4A/019

[8] CORTICAL STEADY POTENTIAL, IMPEDANCE AND EXCITABILITY CHANGES DURING AND AFTER TOTAL ISCHEMIA OF CAT BRAIN [J].

HOSSMANN, KA .

EXPERIMENTAL NEUROLOGY, 1971, 32 (02) :163-&

[9] THEORETICAL INVESTIGATION TO THE NON-CONTACTING CONDUCTIMETRY FOR BIOLOGICAL-MATERIALS [J].

KITTL, H ;

WACH, P .

BIOMEDIZINISCHE TECHNIK, 1981, 26 (06) :153-157

[10] SPECIFIC RESISTIVITY OF CEREBRAL CORTEX AND WHITE MATTER [J].

LI, CL ;

BAK, AF ;

PARKER, LO .

EXPERIMENTAL NEUROLOGY, 1968, 20 (04) :544-&

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