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The Journal of microwave power最新文献

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A new inductive applicator for hyperthermia. 一种新型热疗感应器。
The Journal of microwave power Pub Date : 1983-12-01 DOI: 10.1080/16070658.1983.11689339
H Kato, T Ishida
{"title":"A new inductive applicator for hyperthermia.","authors":"H Kato,&nbsp;T Ishida","doi":"10.1080/16070658.1983.11689339","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689339","url":null,"abstract":"<p><p>We have designed a new type of applicator for inductive heating which consists of a one-turn, square, column-like coil, through which RF current flows. The material to be heated is placed alongside one of the external sides of the coil. The depth of penetration from an applicator with a height of 20 cm, width of 20 cm, depth of 60 cm was calculated to be 11.7 cm. However, in experiments using a muscle-equivalent agar phantom 60 cm X 60 cm X 60 cm, the penetration depth proved to be 9.6 cm; but in another experiment using a smaller phantom 20 cm X 40 cm X 60 cm, the penetration depth was 6.3 cm. This means that the depth of penetration depends not only on the size of the applicator but also on the shape of the material heated. Our study clearly showed that this applicator produces much less heat in the fat layer than in the muscle layer and should be an inductive applicator suitable for deep heating cancer therapy.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 4","pages":"331-6"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689339","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17618944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Further evidence of an inverse relation between mammalian body mass and sensitivity to radio-frequency electromagnetic radiation. 进一步证明哺乳动物的体重和对射频电磁辐射的敏感度呈反比关系。
The Journal of microwave power Pub Date : 1983-12-01 DOI: 10.1080/16070658.1983.11689344
C J Gordon
{"title":"Further evidence of an inverse relation between mammalian body mass and sensitivity to radio-frequency electromagnetic radiation.","authors":"C J Gordon","doi":"10.1080/16070658.1983.11689344","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689344","url":null,"abstract":"","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 4","pages":"377-83"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689344","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17618947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Electrical impedance measurement of urinary bladder fullness. 膀胱充盈度的电阻抗测量。
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689335
J C Abbey, L Close
{"title":"Electrical impedance measurement of urinary bladder fullness.","authors":"J C Abbey,&nbsp;L Close","doi":"10.1080/16070658.1983.11689335","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689335","url":null,"abstract":"<p><p>A tetrapolar 75-kHz, 0.2-mA constant-current electrical impedance measuring system was used to monitor urinary volume change over 12 four-hour sessions in 20 male and 20 female normal human subjects. Two spot voltage electrodes (E) and two spot current electrodes (I) were applied 5 cm above the symphysis pubis at 15 cm interelectrode distances, 7.5 cm bilaterally from the midline. Five measurements of impedance and skin temperature were made at 15-minute intervals over 4 hours. Specific gravity, impedance change, and volume were recorded with each voided specimen. Suprailiac and infrascapular skinfolds, and circumference at iliac crests were measured. The subjects drank 175 ml of fluids per hour during the testing session. Subjects remained in the supine position during measurements. They walked to the lavatory to void. Bladder fullness is defined as the urge to void. Results include: (1) a poor negative correlation between specific gravity of urine and impedance (r2 = 0.1240, p less than or equal to 0.01); (2) baseline impedance was dependent upon individual subject characteristics: in males skin area, skinfold thickness, and suprailiac circumference; in females skinfold thicknesses and time since last menstrual period; (3) impedance decreased with urinary bladder filling and increased upon voiding (p less than or equal to 10(-10)); (4) the cumulative sum test (CUSUM) predicted time to void in 78.9% of voids (p less than or equal to 0.05) and no void (when voiding did not occur) in 66.8% of no voids (p less than or equal to 0.05). Overall accuracy of the CUSUM test was 74.6% (p less than or equal to 0.05).</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"305-9"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689335","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17614976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Some basic properties of biological tissues for potential biomedical applications of millimeter waves. 毫米波潜在生物医学应用中生物组织的一些基本特性。
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689334
O P Gandhi
{"title":"Some basic properties of biological tissues for potential biomedical applications of millimeter waves.","authors":"O P Gandhi","doi":"10.1080/16070658.1983.11689334","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689334","url":null,"abstract":"<p><p>The paper gives the highlights of the reports in the literature on sharp, distinct resonances in the absorption and action spectra at millimeter wavelengths of various biochemicals, and bacteriological and biological preparations. If true, these properties may be employed for in-vitro diagnostic applications and form a basis for frequency-specific health hazards and for new forms of cancer therapy. Carefully performed experiments in our laboratory have failed to reveal frequency-specific biological effects on BHK-21/C13 mammalian cells, on induction of lambda prophages in lysogenic Escherichia coli and on back-mutation of His Salmonella typhimurium cells. Also on account of the high absorbance of water (13--36 dB/mm) which is an essential part of living tissues, little or no differences have been observed for the absorption spectra biological samples in the 26.5 to 90.0 GHz band. Dielectric characterization of the biological samples is needed and may form a basis for broadband differences in the millimeter wave absorption by various tissues.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"295-304"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689334","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17261711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 50
Microwave methods of measuring changes in lung water. 微波法测定肺水变化。
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689331
M F Iskander, C H Durney
{"title":"Microwave methods of measuring changes in lung water.","authors":"M F Iskander,&nbsp;C H Durney","doi":"10.1080/16070658.1983.11689331","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689331","url":null,"abstract":"<p><p>Two microwave methods for measuring changes in lung water content have been investigated. The first is based on measuring changes in the phase of an active microwave signal transmitted through the thorax, while the other is based on measuring the natural microwave radiation emitted by the body with a radiometer. The feasibility of using the active microwave method is investigated by making measurements on phantoms, on anesthetized dogs with induced pulmonary edema, and on isolated dog lungs. The obtained results clearly illustrated that the method is sensitive enough to measure small changes in lung water content. In the radiometer method, on the other hand, both calculations and preliminary measurements in phantoms indicate that the natural microwave emission changes with lung water content and that conventional radiometry systems should be able to detect as little as three to four percent change in lung water content. Initial results from both methods, therefore, indicate the soundness of the basic ideas and justify further development of these methods for clinical use.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"265-75"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689331","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17614973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Introduction to correlation microwave thermography. 相关微波热成像导论。
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689333
A Mamouni, Y Leroy, J C Van de Velde, L Bellarbi
{"title":"Introduction to correlation microwave thermography.","authors":"A Mamouni,&nbsp;Y Leroy,&nbsp;J C Van de Velde,&nbsp;L Bellarbi","doi":"10.1080/16070658.1983.11689333","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689333","url":null,"abstract":"<p><p>Correlation microwave thermography, a new process based on a coherent detection of noise, is able to improve the localization of the thermal gradients in the tissues. We explain the principles of this method and describe the first system which has been built and tested. Several experiments point out that with this process better spatial resolution and flexibility can be expected.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"285-93"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689333","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17614975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
Electrical impedance imaging of the thorax. 胸部电阻抗成像。
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689329
Y Kim, J G Webster, W J Tompkins
{"title":"Electrical impedance imaging of the thorax.","authors":"Y Kim,&nbsp;J G Webster,&nbsp;W J Tompkins","doi":"10.1080/16070658.1983.11689329","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689329","url":null,"abstract":"<p><p>In this paper, we propose to develop a new imaging technology, computerized impedance tomography (CIT) for imaging the thorax. Our study involves reconstructing images of thoracic transverse plane impedance distributions noninvasively and nondestructively and exploring the potential of CIT. We overcome the reconstruction problem due to nonlinear and nonplanar current paths in impedance imaging by solving Laplace's equation numerically for every iteration and by using a new back-projection algorithm to modify the impedance profile. We discuss advantages and disadvantages associated with impedance imaging, the computer model, and back-projection algorithms used in reconstructing impedance images. We present reconstructed impedance images with 8 projection angles and different projection methods. We identify important variables affecting the quality of reconstructed images, and discuss the resolution and accuracy of this imaging technique. We summarize numerical aspects, computer requirement, and limitations of impedance imaging. We also discuss the future of impedance imaging.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"245-57"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689329","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17614971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 84
Nuclear magnetic resonance and transcutaneous electromagnetic blood flow measurement. 核磁共振和经皮电磁血流量测量。
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689327
J H Battocletti, R E Halbach, S X Salles-Cunha, A Sances
{"title":"Nuclear magnetic resonance and transcutaneous electromagnetic blood flow measurement.","authors":"J H Battocletti,&nbsp;R E Halbach,&nbsp;S X Salles-Cunha,&nbsp;A Sances","doi":"10.1080/16070658.1983.11689327","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689327","url":null,"abstract":"<p><p>Static and alternating magnetic fields are employed in blood flowmeters using nuclear magnetic resonance (NMR) principles and electromagnetic induction by a moving conductor (TEM). Both techniques require high steady magnetic fields, obtained either from permanent magnets or from electromagnets. A relatively homogeneous magnetic field is needed for NMR, but, though important for calibration, homogeneity is not critical for TEM. NMR is more complex than TEM since it requires radio-frequency and audio-frequency magnetic fields. However, the TEM method requires surface electrodes in contact with the skin, or needle electrodes placed subcutaneously, whereas NMR is contactless. The NMR flowmeter can be calibrated directly, but appropriate and approximate models must be assumed and then solved by computer to quantify blood flow by the TEM flowmeter. Flow in individual vessels is measured a priori in the TEM flowmeter by virtue of the assumed models. To measure flow in individual vessels by NMR, a scanning or ranging method is required, which logically leads to blood flow imaging. The levels of steady, radio-frequency, and audio-frequency magnetic fields used in the two types of flowmeters are low enough so as not to cause any apparent stimulus to human volunteers and patients tested.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"221-32"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689327","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17292416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrical measurement of fluid distribution in human legs: estimation of extra- and intra-cellular fluid volume. 人体腿部液体分布的电测量:细胞外和细胞内液体体积的估计
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689328
H Kanai, K Sakamoto, M Haeno
{"title":"Electrical measurement of fluid distribution in human legs: estimation of extra- and intra-cellular fluid volume.","authors":"H Kanai,&nbsp;K Sakamoto,&nbsp;M Haeno","doi":"10.1080/16070658.1983.11689328","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689328","url":null,"abstract":"<p><p>In this paper, we discuss the problems of measurement of intra- and extra-cellular fluid distribution in living tissues by means of electrical impedance. The intra- and extra-cellular fluid distribution is related to some physiological parameters, such as blood circulation, metabolism of tissues, and the electrolytic concentration of intra- and extra-cellular fluids. Therefore, the information about the distribution of fluids in tissues is quite useful for the diagnosis of various diseases, the monitoring of seriously ill patients, and in medical treatments such as artificial dialysis. We discuss the method of measurement and the results of experiments.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"233-43"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689328","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17614970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 64
Microwave radiometric system for biomedical 'true temperature' and emissivity measurements. 用于生物医学“真温度”和发射率测量的微波辐射测量系统。
The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689332
K M Lüdeke, J Köhler
{"title":"Microwave radiometric system for biomedical 'true temperature' and emissivity measurements.","authors":"K M Lüdeke,&nbsp;J Köhler","doi":"10.1080/16070658.1983.11689332","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689332","url":null,"abstract":"<p><p>A novel type of radiometer is described, which solves the problem of emissivity-(mismatch)-independent noise temperature measurements by simultaneous registration of an object's apparent temperature and its reflectivity with just one microwave receiver and real-time calculation of the object's emissivity and its actual temperature.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 3","pages":"277-83"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689332","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17614974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
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