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So far, driving wireless capsule endoscope(WCE) in the intestine forward from the outside of the body is challenging due to its soft, winding and smooth properties. A potential approach to propelling WCE forward is rotating it by magnetic fields. To investigate WCE's efficiency of translational movement when it was rotating, nine capsules mounted spirals with different diameters and lead angles were...
This work fabricates four spiral-type capsules with magnet rings. A small magnetic driving equipment, including a stepper motor, a power supplier, a motor controller, a motor driver, and two bar magnets, was developed. The bar magnets were attached oppositely on the axis of motor, and the rotational speed of motor can be adjusted conveniently. The rotational magnetic fields can be generated when the...
Capsule endoscopy is a new imaging technology for small intestine due to its breakthrough for direct visualization of small intestine for the first time. However, the video data produced for each patient costs a physician much time to inspect. Aiming for reducing the burden of a physician, video scene analysis is indispensable. In this paper, we propose a new video segmentation method to analyze a...
As the capsule endoscope lens will produce geometric distortion, while there is an angle and a corner between the camera image plane and the plane of scene, so the images of capsule endoscope get nonlinear geometric distortion. Before the capsule endoscope images are used to accurately analysis, we should eliminate these distortions. Typically, the correction uses a calibration pattern, which can...
For the Wireless Capsule Endoscopy (WCE), one of the most important medical actions is to find the size of the target disease tissue, on which the proper diagnosis can be made to determine the further medical operation. Since 2D estimation results in large error for the tissue size, 3D calculation is preferred. To obtain 3D information for the objective tissue, we can apply 3D reconstruction for the...
Digestive tract cancer is a big threat to human and capsule endoscopy (CE) is a relatively new technology to detect the diseases in the small bowel. Since polyp is an important symptom of digestive cancer it is important to detect them by computerized methods. In this work, we comparatively investigate computer aided detection for polyps by machine learning based methods that are built upon color...
The Wireless Capsule Endoscopy (WCE) has been gradually used in hospitals due to its breakthrough that it can view the whole gastrointestinal with less suffering. Nevertheless, it generates too many images each time causing a huge burden to physicians; therefore it's meaningful to help physicians to employ computerized methods to diagnose. One important way is to build up three-dimensional (3D) model...
To improve the quality of images collected by the wireless capsule endoscope (WCE) and to decrease the system energy consumption, we proposed a novel design of WCE. This WCE system integrates a CMOS sensor with an optional JPEG compression engine, a low power consumption high-performance micro-controller and an ultra low power RF transceiver in a small capsule (less than 10 mm × 25 mm). Experiment...
The location and orientation of the wireless capsule endoscope inside the human body is very important for the gastrointestinal (GI) examination. To satisfy the requirement of the position and gesture information of endoscope, a magnetic localization and orientation system is built. The system uses a permanent magnet as excitation source to create the magnetic field, and consists of a magnetic sensor...
Wireless capsule endoscopy (WCE) is a great breakthrough for Gastrointestinal (GI) Tract diagnoses, and it can view the entire gastrointestinal tract, especially the small intestine without invasiveness and sedation. However, a tough problem associated with this new technology is that too many images to be inspected by naked eyes cause a huge burden to physicians, so it is significant to find an automatic...
To track the movement of wireless capsule endoscope in the human body, we design a magnetic localization and orientation system. In this system, capsule contains a permanent magnet as the movable object. A wearable magnetic sensor array is arranged out of the human body to capture the magnetic signal. This sensor array is composed of magnetic sensors, Honeywell product HMC1043. The variations of magnet...
To track the movement of a wireless capsule and get the 6D localization and orientation information of the capsule, a magnetic localization and orientation system is designed. In this system, we propose to enclose two orthogonal permanent magnets in the capsule. With the magnetic sensor array arranged out of the human body, we can measure the magnets' magnetic signals, and compute the magnets' 3D...
To build a new type of wireless capsule endoscope with interactive gastrointestinal tract examination, a localization and orientation system is needed for tracking 3D location and 3D orientation of the capsule movement. The magnetic localization and orientation method produces only 5 DOF, but misses the information of rotation angle along capsule's main axis. In this paper, we presented a complementary...
To track the movement of a wireless capsule, a magnetic localization and orientation system is designed. In this system, a permanent magnet is enclosed in the capsule, which generates a magnetic field around. With the magnetic sensor array arranged out of the human body, we can measure the magnet's magnetic signals, and compute the capsule's 3D localization and 2D orientation parameters by applying...
A permanent magnet is embedded in the capsule endoscope to perform as an excitation source for tracking capsule's position and orientation, and a magnetic sensor array is built around the capsule to capture the signals from magnet. However, the magnet-field signal is weak and attenuates dramatically when the spatial distance between the magnet and the sensor increases. How to detect this weak magnetic...
A capsule endoscope robot is a miniature medical instrument for inspecting human gastrointestinal tract. One of the objectives of the capsule endoscope robot is to wirelessly transmit as many captured images as possible, so an efficient representation and compression technique is required. In this paper, we present image representation and compression techniques for the capsule endoscope. First, the...
To build a wireless capsule endoscope with active external guidance for controllable and interactive diagnosis on the gastrointestinal tract, it is necessary to track the capsule's 3-D position and 3-D orientation. An approach to tracking is to enclose a small rectangular permanent magnet in the capsule. The magnetic field produced around the body by the rectangular magnet can be detected by magnetic...
We presents a new closed loop approach for the active actuation of wireless capsule endoscope inside the human GI tract. A magnet is enclosed in the capsule, and its position, orientation, and movement are detected by a magnetic localization system. To actuate the capsule, an external rotative magnetic field is applied around human body such that a driving force is created in the capsule by the magnet...
Capsule endoscopy, as a new technology involving integrated circuits, MEMS, image processing, radio transmission, and power supply, makes a significant break-through in the GI examination and therapy. However, there are still many problems for the applications of capsule endoscopes, especially for control or actuation of the capsule movement. Therefore, we propose a new technique to address these...
A magnetic localization and orientation is designed to track the movement of capsule endoscope during the gastrointestinal examination process. In this paper, based on the magnetic localization and orientation linear algorithm we proposed, magnetic localization and orientation software is designed. The software is composed by some modules, such as data acquisition, algorithm, calibration, and so on...
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