STUDY OF A POSITION AND ORIENTATION TRACKING METHOD FOR WIRELESS CAPSULE ENDOSCOPE

2005 ◽  
Vol 02 (02) ◽  
pp. 113-121 ◽  
Author(s):  
XIAONA WANG ◽  
MAX Q.-H. MENG
Keyword(s):  
Tracking Error ◽  
Axial Direction ◽  
Capsule Endoscope ◽  
Arbitrary Orientation ◽  
Tracking Method ◽  
Magnetic Marker ◽  
Position And Orientation ◽  
Hall Sensors ◽  
Wireless Capsule ◽  
The Magnetic Field

This paper introduces a position and orientation tracking method, which has the potential to be used in capsule endoscope localization. This tracking method is based on the strength of the magnetic field generated by a magnetic marker in the space. Levenberg–Marquardt optimization algorithm is used for calculation of the parameters of the magnetic marker. The experiment results showed that when the axes of all sensors are all in one direction, the tracking results rely much on the orientation of the dipole. When the magnetic dipole is in sensor's axial direction, the tracking error is within 4 mm in a space of 60×60×100 mm enclosed by 8 hall sensors; the system is real time and quite robust. But the trackable scope becomes much smaller when the dipole has an arbitrary orientation. The reason is analyzed theoretically.

scholarly journals Error reduction through post processing for wireless capsule endoscope video

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Pål Anders Floor ◽  
Ivar Farup ◽  
Marius Pedersen ◽  
Øistein Hovde
Keyword(s):  
Error Reduction ◽  
Capsule Endoscope ◽  
Post Processing ◽  
Wireless Capsule

Study on a magnetic spiral-type wireless capsule endoscope controlled by rotational external permanent magnet

2015 ◽  
Vol 395 ◽  
pp. 316-323 ◽  
Author(s):  
Bo Ye ◽  
Wei Zhang ◽  
Zhen-jun Sun ◽  
Lin Guo ◽  
Chao Deng ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Capsule Endoscope ◽  
Wireless Capsule ◽  
Spiral Type ◽  
Magnetic Spiral

scholarly journals A Feasibility Study of a Noncontact Torque Sensor with Multiple Hall Sensors

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Kyungshik Lee ◽  
Chongdu Cho
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Power Transmission ◽  
Magnetic Sensors ◽  
Torque Sensor ◽  
Torque Measurement ◽  
Test Range ◽  
Variable Power ◽  
Hall Sensors ◽  
The Magnetic Field

The feasibility of a noncontact sensor is investigated. This type of sensor can potentially be used for torque measurement in a speed-variable power transmission system. Torque can be read by examining the phase difference between two induction signals from respective magnetic sensors that detect the magnetic field intensity of permanent magnets mounted on the surface of a shaft in rotation. A real-time measuring algorithm that includes filtering and calibration is adopted to measure the torque magnitude. It is shown that this new torque sensor can perform well under rotation speeds ranging from 300 rpm to 500 rpm. As an interim report rather than a complete development, this work demonstrates the feasibility of noncontact torque measurement by monitoring a magnetic field. The result shows an error of less than 2% within the full test range, which is a sufficient competitive performance for commercial sensors. The price is very low compared to competitors in the marketplace, and the device does not require special handling of the shaft of the surface.

The stability of viscous flow in a curved channel in the presence of a magnetic field

1961 ◽  
Vol 264 (1317) ◽  
pp. 155-164 ◽  
Keyword(s):  
Magnetic Field ◽  
Viscous Flow ◽  
Uniform Magnetic Field ◽  
Axial Direction ◽  
Electrical Conductor ◽  
Curved Channel ◽  
Coaxial Cylinders ◽  
Transverse Pressure ◽  
The Stability ◽  
The Magnetic Field

The stability of viscous flow between two coaxial cylinders maintained by a constant transverse pressure gradient is considered when the fluid is an electrical conductor and a uniform magnetic field is impressed in the axial direction. The problem is solved and the dependence of the critical number for the onset of instability on the strength of the magnetic field and the coefficient of electrical conductivity of the fluid is determined.

scholarly journals A survey of video capsule endoscope system based on wireless energy transfer technology

2020 ◽  
Vol 309 ◽  
pp. 01007
Author(s):  
Ting Fang ◽  
Xiongwei Wu
Keyword(s):  
Gastrointestinal Diseases ◽  
Frame Rate ◽  
Internal Space ◽  
Capsule Endoscope ◽  
Non Invasive ◽  
Detection Technology ◽  
Endoscope System ◽  
Wireless Capsule ◽  
Time Image

The wireless capsule endoscope system allows clinicians to directly observe the image of the inner wall of the human gastrointestinal tract and obtain the most intuitive information at the lesion. Compared with traditional endoscopic detection technology, its painless, non-invasive, safe and convenient, full gastrointestinal detection features make this technology a research focus in the field of medical devices at home and abroad. As a new non-invasive detection technology for gastrointestinal diseases, the working time, image frame rate and image quality of the existing wireless capsule endoscope system cannot fully meet the needs in clinical applications. The cause of these problems lies in the capsule. The internal space of the speculum is limited, and only the button battery can be used as the energy source. Therefore, it is necessary to design a video capsule endoscope based on wireless energy transmission technology. This article is a review of Zhu Zhanquan, Xue Kaifeng, Lu Ruiqi and other scholars.

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