# IEEE Transactions on Biomedical Engineering

## Filter Results

Displaying Results 1 - 25 of 27

Publication Year: 1975, Page(s): c1
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• ### IEEE Engineering in Medicine and Biology Group

Publication Year: 1975, Page(s): c2
| |PDF (171 KB)
• ### On the Independence of Magnetic and Electric Body Surface Recordings

Publication Year: 1975, Page(s):157 - 167
Cited by:  Papers (25)
| |PDF (3082 KB)

Recent papers have shown that the ECG depends on the flow sources of the impressed field in the heart while the MCG is a function of its vortex source distribution. It has consequently been suggested that body surface electric and magnetic recordings yield completely independent information about the physiological generators. Such independence would be of enormous significance wherever present dia... View full abstract»

• ### A Study of the Vector Magnetocardiographic Waveform

Publication Year: 1975, Page(s):167 - 174
Cited by:  Papers (14)  |  Patents (2)
| |PDF (2786 KB)

A description of the measurement techniques for obtaining vector magnetocardiograms (MCG) and a discussion of the significance of the MCG is presented. A map of vector MCG is shown in terms of its three components on a plane above the chest for both the magnetic analog of the QRS wave and the T wave. The waveform of the vector MCG is described and contrasted with the electrocardiogram (ECG). Studi... View full abstract»

• ### A Comparison of Two Methods for Determining the Extracellular Potential Field of an Isolated Purkinje Strand in a Volume Conductor

Publication Year: 1975, Page(s):174 - 183
Cited by:  Papers (8)
| |PDF (2166 KB)

The models considered in this study are those of Spach et al., [1], and Clark and Plonsey [6], [7]. Both assume circular cylindrical geometry for the isolated Purkinje strand and input information to the models consists mainly of the recorded transmembrane action potential, the ratio of conductivities of the intra- and extracellular media, the conduction velocity of the action potential, and the r... View full abstract»

• ### The Choroidal Eye Oximeter: An Instrument for Measuring Oxygen Saturation of Choroidal Blood In Vivo

Publication Year: 1975, Page(s):183 - 195
Cited by:  Papers (15)  |  Patents (16)
| |PDF (4872 KB)

The Choroidal Eye Oximeter is an electro-optical instrument that non-invasively measures the oxygen saturation of choroidal blood in the back of the human eye by a spectrophotometric method. Since choroidal blood is characteristic of blood which is supplied to the brain, the Choroidal Eye Oximeter is essentially using the eye as a window'' to look into the brain. The instrument can thus be used ... View full abstract»

• ### MITNYS-II-A Digital Program for On-Line Analysis of Nystagmus

Publication Year: 1975, Page(s):196 - 202
Cited by:  Papers (22)  |  Patents (1)
| |PDF (1892 KB)

A digital computer program, MITNYS-II, has been developed for on-line analysis of nystagmus which results from visual, vestibular or caloric stimulation. The program accepts sampled records of eye position and yields cumulative slow phase position, slow phase velocity, instantaneous fast phase frequency and other parameters in 25 ms. In this paper the algorithms by which fast phases are detected, ... View full abstract»

• ### Vertical and Horizontal Eye Movement Recording in the Unrestrained Cat

Publication Year: 1975, Page(s):202 - 207
Cited by:  Papers (2)
| |PDF (3192 KB)

A simple electromagnetic system is described which allows simultaneous monitoring of vertical and horizontal eye movements in the unrestrained cat. A restricted magnetic field is induced through a coil fixed to the zygomatic bone, under the skin. The coil leads led subdermally to a skull implanted pedestal are connected to a 15000 Hz sine-wave generator. The induced field is detected through a sma... View full abstract»

• ### A New Automatic Constant Current Stimulator and Its Biological Applications

Publication Year: 1975, Page(s):207 - 212
Cited by:  Papers (4)  |  Patents (1)
| |PDF (2916 KB)

An instrument capable of constant current stimulation of biological preparations is described. The device can be automatically programmed in an on-line manner by a digital computer or special purpose logic. Experiments are freed of the time consuming and error producing task of continually monitoring experimental situations. Several biological uses of this instrument are discussed. View full abstract»

• ### A Low-Capacitance Multielectrode Probe for Use in Extracellular Neurophysiology

Publication Year: 1975, Page(s):212 - 219
Cited by:  Papers (88)  |  Patents (18)
| |PDF (4153 KB)

A multielectrode structure containing integrated junction-FET input stages is described. Photoengraved microelectrodes are utilized to obtain high dimensional precision, small size, and extremely low capacitive coupling between electrodes. The interelectrode capacitance is less than 0.01 pf. The integrated input devices (JFET's) reduce the impedance levels on the recording channels to less than 50... View full abstract»

• ### Instrumentation for In Vivo Cerebral NADH Studies in Squirrel Monkey

Publication Year: 1975, Page(s):220 - 224
Cited by:  Papers (2)
| |PDF (2075 KB)

The optical and electronic design features of a reliable microspectrofluorometer that allows successful microfluorometric studies in areas of brain ischemia over a period of 2.0 hours are described in detail. The apparatus allows moment-to-moment recording of the oxidation-reduction state of brain mitochondria in areas of ischemia and therefore affords the potential of measuring the immediate effe... View full abstract»

• ### An Analysis of the Electromyogram by Fourier, Simulation and Experimental Techniques

Publication Year: 1975, Page(s):225 - 229
Cited by:  Papers (77)
| |PDF (1054 KB)

The electromyogram of a single motor unit is studied by considering it as a time function defined by a convolution integral where a point process input passes through a filter whose impulse response is the shape of a single motor unit action potential. The interspike intervals are assumed to be normally distributed, independent random variables. Simulation is performed on a digital computer. The t... View full abstract»

• ### Automatic Detection of the Left Ventricular Outline in Angiographs Using Television Signal Processing Techniques

Publication Year: 1975, Page(s):230 - 237
Cited by:  Papers (11)  |  Patents (1)
| |PDF (7060 KB)

Structures characterized by a brightness contour can be automatically detected when the information is carried by a video signal. The detection system described here processes the available position and brightness information of the picture in a way closely related to the features of such structures. Real time processing of the picture information is made possible by the use of very simple memorie... View full abstract»

• ### Effects of Unphysiological Factors on Cardiac Output Regulation During Artificial Heart Pumping

Publication Year: 1975, Page(s):238 - 245
Cited by:  Papers (1)  |  Patents (1)
| |PDF (1691 KB)

Several Factors affecting artificial heart output were studied employing two mathematical models of prosthetic hearts, i.e., sac and diaphragm heart models. The stroke volume sensitivity to changes in venous pressure was analyzed by numerical computations. Increased inflow valve resistance, increased pump vacuum pressure, decreased elasticity of the ventricular sac or diaphragm and decreased size ... View full abstract»

• ### A Shortcoming of the Median Evoked Response

Publication Year: 1975, Page(s): 245
Cited by:  Papers (4)
| |PDF (264 KB)

A shortcoming of the Median Evoked Response is discussed and a means for dealing with it is suggested. View full abstract»

• ### Parameter Identification of Signals Composed of Delayed Exponentials

Publication Year: 1975, Page(s):246 - 248
Cited by:  Papers (2)
| |PDF (924 KB)

This paper develops an approach to the problem of parameter identification from a signal which is a finite sum of possibly delayed exponentials. The coefficients and exponents, as well as the time delays, are found using a noniterative algorithm based on a matrix formulation of discrete-time convolution. Two methods of application are discussed and an example is included. View full abstract»

• ### An LED-Transistor Photoplethysmograph

Publication Year: 1975, Page(s):248 - 250
Cited by:  Papers (17)
| |PDF (1645 KB)

A commercial transducer combining a gallium arsenide infrared emitting diode and silicon phototransistor has been adapted for use as a photoelectric plethysmograph. This device is superior to the tungsten lamp-photoconductive cell plethysmograph generally available. View full abstract»

• ### Frequency Stability of an Implantable Pressure Telemetry Capsule

Publication Year: 1975, Page(s):250 - 252
Cited by:  Papers (3)  |  Patents (1)
| |PDF (860 KB)

An implantable pressure telemetry capsule was developed to permit monitoring cuff pressure in an artificial urethral sphincter during chronic conditions. Following implantation, the baseline frequency of the capsule was observed to increase by nearly 2 percent. A series of experiments was then conducted to determine whether this increase was caused by the temperature rise after implant, by fluid m... View full abstract»

• ### Triboelectric Interference in the ECG

Publication Year: 1975, Page(s):252 - 255
Cited by:  Papers (15)  |  Patents (1)
| |PDF (1090 KB)

Triboelectric noise resulting from motion in the patient vicinity has been observed to occasionally interfere with the ECG. Experiments were performed to verify the nature of the interference and to define the factors which enable this ever-present phenomenon to interfere with ECG acquisition. No instances have been observed that could not be corrected by good electrode placement technique. This s... View full abstract»

• ### Precision Digital Instrument for Calculation of Heart Rate and R-R Interval

Publication Year: 1975, Page(s):255 - 257
Cited by:  Papers (6)  |  Patents (3)
| |PDF (780 KB)

An economical precision digital heart rate meter has been constructed for use in general laboratory EKG studies and especially as a diagnostic aid in pacemaker clinics. The instrument features a digital method for rate computation with no calibration required, a system test feature and ability to measure and digitally display both heart rate in beats per minute (bpm) and R-R interval in milisecond... View full abstract»

• ### A Simple Electrogoniometric System and Its Testing

Publication Year: 1975, Page(s):257 - 259
Cited by:  Papers (9)  |  Patents (2)
| |PDF (1493 KB)

A simple goniometric system intended for quantitative evaluation of a patients' gait is described. The hip, knee and ankle angles of both legs in the sagittal plane and the contacts between ground and three parts of the sole were measured. By using a special knob to adjust and fix the knee potentiometer axis position, a small number of selectively chosen attachments and very light construction, th... View full abstract»

• ### A Simple Computer-Television Interface System for Gait Analysis

Publication Year: 1975, Page(s):259 - 260
Cited by:  Papers (14)
| |PDF (368 KB)

A new method for analysis and recording of gait parameters is reported. This method consists of a television camera interfaced with a PDP-11/10 minicomputer. The TV camera picks up anatomical points of interest such as knee joint, ankle joint, etc., to which small lights are attached and the computer calculates their coordinates and joint angles as a function of time. View full abstract»

• ### Reducing the Electric Field in Coil Systems Used for Environmental Research

Publication Year: 1975, Page(s):260 - 262
| |PDF (1329 KB)

Series resonant coil systems are being used to study the effects of ELF magnetic fields on living systems. High inductive voltages generate electric fields that prevent the separation of magnetic and electric field effects. These electric fields can be reduced by using multiple capacitor banks and connecting the coils and capacitors so that the electric fields cancel each other. View full abstract»

• ### Contributors

Publication Year: 1975, Page(s):263 - 267
| |PDF (5498 KB)
• ### Membership Application IEEE Engineering in Medicine & Biology Group

Publication Year: 1975, Page(s): 268
| |PDF (153 KB)

## Aims & Scope

IEEE Transactions on Biomedical Engineering contains basic and applied papers dealing with biomedical engineering. Papers range from engineering development in methods and techniques with biomedical applications to experimental and clinical investigations with engineering contributions.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Bin He
University of Minnesota