Myocardial ischemia and infarction can be detected by microwave spectroscopy. I. Experimental evidence

Semenov, Serguei; Svenson, Robert H.; Dezern, Kathy R.; Quinn, Michael; Thompson, Mindi N.; Tatsis, Giorgos

doi:10.1109/iembs.1996.647454

Cited by 4 publications

(3 citation statements)

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“…We have shown [10], [11] that at a frequency of 2.4 GHz, 2-h acute myocardial ischemia causes a 5% decrease in both parts of the complex myocardial dielectric permittivity. On the other hand, chronic myocardial infarction (from two weeks to five months) causes an increase (about 8%-10%) in both parts of the complex myocardial dielectric permittivity.…”

Section: B "Ischemic-infarcted" Zonementioning

confidence: 97%

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Spatial resolution of microwave tomography for detection of myocardial ischemia and infarction-experimental study on two-dimensional models

Semenov

Svenson

Bulyshev

et al. 2000

IEEE Trans. Microwave Theory Techn.

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In this paper, the experimental study of spatial resolution of microwave tomography was performed. Our microwave tomographic system with operational frequencies of 0.9 and 2.36 GHz and with signal-to-noise ratio of 30 dB allowed us to achieve a spatial resolution between 7.3-9.5 mm and 6.3-7.8 mm at the former and latter frequencies, respectively. It was shown in experiments, with structurally complicated objects, that the spatial resolution of about the same distances can be expected in a practical application of microwave tomography to detect areas of myocardial ischemia and infarction.

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Section: B "Ischemic-infarcted" Zonementioning

confidence: 97%

“…Utilizing dielectric spectroscopy, we have studied the changes of myocardial dielectric properties (canine and pig studies) caused by acute ischemia and chronic infarction [10], [11]. The measured dielectric properties of normal in situ canine myocardium and their changes during acute ischemia and chronic infarction are briefly summarized in Section IV-B.…”

mentioning

confidence: 99%

Spatial resolution of microwave tomography for detection of myocardial ischemia and infarction-experimental study on two-dimensional models

Semenov

Svenson

Bulyshev

et al. 2000

IEEE Trans. Microwave Theory Techn.

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“…This method is capable of providing images of dielectrical properties of biological tissues that can directly be identified with physiological conditions of living tissues. It has been proven that changes in dielectrical properties can indicate the existence and location of ischemic and infarction zones in a heart [1]. It also has been shown that dielectrical properties of a breast cancer zone at microwave frequencies are significantly different from that of healthy breast tissues [2].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional microwave tomography. Theory and computer experiments in scalar approximation

et al. 2000

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The results of computer simulated experiments in three-dimensional microwave tomography in scalar approximation are presented. The gradient method is employed to solve three-dimensional high-contrast microwave tomographic problems. A computer model for fullscale three-dimensional imaging has been created. Three-dimensional tomographic images of mathematical models of the human torso were obtained. Significant differences between twodimensional and three-dimensional cases are emphasized. Some illumination schemes which can be applied in the three-dimensional case are discussed. A dependence of image quality on the number of vertically placed transmitters has been demonstrated. The computer simulation showed that three-dimensional full-scale human torso dielectrical properties images can be produced with acceptable computational time.

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Dielectric properties of canine acute and chronic myocardial infarction at a cell relaxation spectrum. II. Theory

Semenov

Svenson

Simonova³

et al. 1997

Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent M

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A new model of bulk myocardium dielectric properties as a composition of membrane covered cells modelled as infinite cylinders has been developed. This model utilizes the complex values of dielectric properties of the intracellular, extracellular media and the cellular membrane. The model was used to analyze the myocardial resistivity above and below the cell membrane relaxation spectrum in normal myocardium and in acute and chronic infarction. This myocardium cell model gives reasonable qualitative explanation not only for the spectrum of normal myocardial resistance but also for observed changes in the spectrum of myocardial resistance in acute ischemia and chronic infarction based on the "volume fraction hypothesis".The contributions of intracellular, extracellular and cell membrane resistances to bulk myocardial resistance are frequency dependent. At frequencies below 0.2MHz the intracellular contribution to bulk resistance is much smaller compared to the extracellular resistance and does not exceed 10-15%. At frequencies higher than O.5MHz the measured bulk resistance reflects extracellular and intracellular resistances at about the same order. The contribution of the cell membrane resistance is much smaller compared to the intracellular and extracellular resistances and does not exceed 0.1 % at frequency near 1Hz for normal myocardium . .

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Myocardial ischemia and infarction can be detected by microwave spectroscopy. I. Experimental evidence

Cited by 4 publications

References 1 publication

Spatial resolution of microwave tomography for detection of myocardial ischemia and infarction-experimental study on two-dimensional models

Spatial resolution of microwave tomography for detection of myocardial ischemia and infarction-experimental study on two-dimensional models

Three-dimensional microwave tomography. Theory and computer experiments in scalar approximation

Dielectric properties of canine acute and chronic myocardial infarction at a cell relaxation spectrum. II. Theory

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