摘要:
A position detection system that does not require calibration measurement to be performed in advance and reduces the work required for detecting a position and so on is provided. The provided position detection system includes a device having a magnetic inductance coil; a drive coil that has a position-calculating frequency near a resonant frequency of the magnetic inductance coil and generates an alternating magnetic field which acts on the magnetic inductance coil; a plurality of magnetic-field sensors that is disposed outside the operating range of the device and detects an induced magnetic field generated by the magnetic inductance coil; amplitude-component detection section for detecting amplitude components whose phase is substantially orthogonal to the alternating magnetic field from the outputs of the magnetic sensors acquired by the plurality of magnetic sensors; and position analyzing section for calculating at least one of a position and an orientation of the device on the basis of the amplitude components.
摘要:
A medical-device magnetic guiding position detecting system that can prevent a decrease in the strength of a position detecting magnetic field in an operating area of a medical device is provided. The medical-device magnetic guiding position detecting system includes a medical device that is disposed in the body of a subject and that includes at least one magnet and a circuit including an internal coil, a first magnetic field generating unit for generating a first magnetic field in the operating area of the medical device, position detecting means for detecting an induction magnetic field induced in the internal coil due to the first magnetic field, and at least one pair of opposing coils for generating a second magnetic field that acts on the at least one magnet. The opposing coils forming each of the at least one pair are independently driven.
摘要:
An in-vivo examination system includes a body-insertable apparatus that moves in a subject; and an external device that acquires information about an inside of the subject. The external device includes a location acquiring unit that acquires a plurality of first locations of the body-insertable apparatus in the subject; a trajectory generating unit that generates a first movement trajectory of the body-insertable apparatus in the subject, based on the plurality of first locations; a trajectory storage unit that stores a second movement trajectory; and a scale adjusting unit that adjusts the first movement trajectory to the second movement trajectory.
摘要:
A position detection apparatus and a medical-device-position detection system that have improved position detection accuracy are provided by setting high amplification for the position detection apparatus. The position detection apparatus includes a circuit that has at least one embedded coil (10a) and that is provided inside an object (10) to be detected; a first magnetic-field generating unit (11) for generating a first magnetic field in the region where the embedded coil (10a) is disposed; a magnetic-field detecting unit (5, 12) for detecting an induced magnetic field generated at the embedded coil (10a) by the first magnetic field; and a second magnetic-field generating unit (23) for generating a second magnetic field having a phase substantially opposite to the phase of the first magnetic field.
摘要:
The position or the direction of a first marker which produces an alternating magnetic field by means of an external power supply is detected precisely even if the first marker coexists with a second marker which includes a resonance circuit having a resonance frequency the same as or close to the frequency of the alternating magnetic field. There is provided a position detection system including a first marker that produces a first alternating magnetic field having a single set of first position-calculating frequencies that are a predetermined frequency away from each other; a second marker provided with a magnetic induction coil having as a resonance frequency a substantially central frequency interposed between the single set of first position-calculating frequencies; a magnetic-field detection section that is disposed outside the working region and that detects a magnetic field at the first position-calculating frequencies; an extracting section that extracts from the detected magnetic field the sum of the intensities of a single set of first detection-magnetic-field components having the single set of first position-calculating frequencies; and a position/direction analyzing section that calculates the position or the direction of the first marker based on the extracted sum.
摘要:
There is provided a position detection system (1) including a first marker (4) that produces a first alternating magnetic field having a first position-calculating frequency by means of an external power supply; a second marker (3) including a magnetic induction coil (5) having a resonance frequency equal to the position-calculating frequency; a magnetic-field detection section (13) that is disposed outside a working region of the second marker (3) and that detects a magnetic field at the first position-calculating frequency; an extracting section (24) that extracts, from the detected magnetic field, a first detection-magnetic-field component having the first position-calculating frequency and having the same phase as the phase of the first alternating magnetic field; and a position/orientation analyzing section (22) that calculates at least one of the position and the orientation of the first marker (4) based on the intensity of the extracted first detection-magnetic-field component.
摘要:
A position detection system that does not require calibration measurement to be performed in advance and reduces the work required for detecting a position and so on is provided. The provided position detection system includes a device having a magnetic inductance coil; a drive coil that has a position-calculating frequency near a resonant frequency of the magnetic inductance coil and generates an alternating magnetic field which acts on the magnetic inductance coil; a plurality of magnetic-field sensors that is disposed outside the operating range of the device and detects an induced magnetic field generated by the magnetic inductance coil; amplitude-component detection section for detecting amplitude components whose phase is substantially orthogonal to the alternating magnetic field from the outputs of the magnetic sensors acquired by the plurality of magnetic sensors; and position analyzing section for calculating at least one of a position and an orientation of the device on the basis of the amplitude components.
摘要:
A medical-device magnetic guiding position detecting system that can prevent a decrease in the strength of a position detecting magnetic field in an operating area of a medical device is provided. The medical-device magnetic guiding position detecting system includes a medical device that is disposed in the body of a subject and that includes at least one magnet and a circuit including an internal coil, a first magnetic field generating unit for generating a first magnetic field in the operating area of the medical device, position detecting means for detecting an induction magnetic field induced in the internal coil due to the first magnetic field, and at least one pair of opposing coils for generating a second magnetic field that acts on the at least one magnet. The opposing coils forming each of the at least one pair are independently driven.
摘要:
A capsule guiding system includes a magnetic guiding unit, a displaying unit, an operation unit, and a control unit. The magnetic guiding unit guides, using magnetic force, a capsule-shaped medical apparatus introduced inside a subject. The displaying unit displays an image of the subject and an image of the capsule-shaped medical apparatus as an overlapped image, and changes relative position and relative direction between the two images as the capsule-shaped medical apparatus is guided by the magnetic guiding unit. The operation unit inputs coordinate information which specifies movement direction of the capsule-shaped medical apparatus. The control unit adjusts coordinate system of the displaying unit and coordinate system of the operation unit to be consistent with each other, transforms the coordinate information input from the operation unit into the coordinate system of the magnetic guiding unit, and controls the guiding of the capsule-shaped medical apparatus based on the transformed coordinate information.
摘要:
A position detection system and method in which the accuracy of position measurement of a device is not decreased with changes in the resonant frequency. The system includes a device having a magnetic induction coil; a driving coil generating an alternating magnetic field, applied to the magnetic induction coil, having a position-calculating frequency in the vicinity of a resonant frequency of the magnetic induction coil; a plurality of magnetic sensors that detects an induced magnetic field generated by the magnetic induction coil; a measurement-reference-value calculating section determining a measurement reference value at the position-calculating frequency when only the alternating magnetic field is applied; a position-analyzing section calculating at least one of the position and orientation of the device and the measurement reference value when the alternating magnetic field and the induced magnetic field are applied; and a redetermining section redetermining the position-calculating frequency at a predetermined timing.