Abstract: A method and apparatus for determining the impedance of the plurality of channels comprising a plurality of channels having a plurality of first channels and a plurality of second channels, at least one reference channel, a signal generator electrically connected to the plurality of channels, a reference signal generator connected to the reference channel, at least one amplifier connected to each of the plurality of channels and the reference channel and at least one filter connected to an output of the at least one amplifier to filter the output signal from the at least one amplifier. The signal generator is configured to provide a plurality of input signals to the plurality of channels. The reference signal generator provides an input signal to the reference channel.

Abstract: A method and apparatus for determining the impedance of the plurality of channels comprising a plurality of channels having a plurality of first channels and a plurality of second channels, at least one reference channel, a signal generator electrically connected to the plurality of channels, a reference signal generator connected to the reference channel, at least one amplifier connected to each of the plurality of channels and the reference channel and at least one filter connected to an output of the at least one amplifier to filter the output signal from the at least one amplifier. The signal generator is configured to provide a plurality of input signals to the plurality of channels. The reference signal generator provides an input signal to the reference channel.

Abstract: A cable for enhancing biopotential measurements, including a core, the core including a first conductive line, a first shield that surrounds the first conductive line, and a first insulator that surrounds the first shield. The cable further includes a control section located outside the core, which includes a second conductive line, a second shield that surrounds the conductive line, and a second insulator that surrounds the second shield.

Abstract: A cable for enhancing biopotential measurements, including a core, the core including a first conductive line, a first shield that surrounds the first conductive line, and a first insulator that surrounds the first shield. The cable further includes a control section located outside the core, which includes a second conductive line, a second shield that surrounds the conductive line, and a second insulator that surrounds the second shield.

Abstract: A method of measuring blood flow through a blood vessel is provided using a single quasi-continuous mode probe that can support multiple frequencies without increasing the probe tip size. A plurality of elements are provided in the probe tip. Each element emits ultrasound waves using a long pulsed signal with each element having a different resonant frequency. Each element also receives ultrasound energy in a continuous mode. A selector is manually controlled by a practitioner to select the active element. The output may take a variety of forms. For example, the output may be printed, displayed, recorded to a memory, and/or played through a speaker or headset.

Abstract: A method of measuring blood flow through a blood vessel is provided using a single quasi-continuous mode probe that can support multiple frequencies without increasing the probe tip size. A plurality of elements are provided in the probe tip. Each element emits ultrasound waves using a long pulsed signal with each element having a different resonant frequency. Each element also receives ultrasound energy in a continuous mode. A selector is manually controlled by a practitioner to select the active element. The output may take a variety of forms. For example, the output may be printed, displayed, recorded to a memory, and/or played through a speaker or headset.