Geomagnetic Compensation for the Rotating of Magnetometer Array During Magnetic Tracking

2019 ◽  
Vol 68 (9) ◽  
pp. 3379-3386 ◽  
Author(s):  
Houde Dai ◽  
Chao Hu ◽  
Shijian Su ◽  
Mingqiang Lin ◽  
Shuang Song
Keyword(s):  
Magnetic Tracking ◽  
Magnetometer Array

scholarly journals Towards Tracking of Deep Brain Stimulation Electrodes Using an Integrated Magnetometer

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2670
Author(s):  
Thomas Quirin ◽  
Corentin Féry ◽  
Dorian Vogel ◽  
Céline Vergne ◽  
Mathieu Sarracanie ◽  
...  
Keyword(s):  
Deep Brain Stimulation ◽  
Brain Stimulation ◽  
Mean Absolute Error ◽  
Tracking System ◽  
Three Dimensional ◽  
Absolute Error ◽  
Magnetic Tracking ◽  
Magnetic Camera ◽  
Magnetic Resonance Imaging Mri ◽  
Deep Brain

This paper presents a tracking system using magnetometers, possibly integrable in a deep brain stimulation (DBS) electrode. DBS is a treatment for movement disorders where the position of the implant is of prime importance. Positioning challenges during the surgery could be addressed thanks to a magnetic tracking. The system proposed in this paper, complementary to existing procedures, has been designed to bridge preoperative clinical imaging with DBS surgery, allowing the surgeon to increase his/her control on the implantation trajectory. Here the magnetic source required for tracking consists of three coils, and is experimentally mapped. This mapping has been performed with an in-house three-dimensional magnetic camera. The system demonstrates how magnetometers integrated directly at the tip of a DBS electrode, might improve treatment by monitoring the position during and after the surgery. The three-dimensional operation without line of sight has been demonstrated using a reference obtained with magnetic resonance imaging (MRI) of a simplified brain model. We observed experimentally a mean absolute error of 1.35 mm and an Euclidean error of 3.07 mm. Several areas of improvement to target errors below 1 mm are also discussed.

scholarly journals A new wearable multichannel magnetocardiogram system with a SERF atomic magnetometer array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yanfei Yang ◽  
Mingzhu Xu ◽  
Aimin Liang ◽  
Yan Yin ◽  
Xin Ma ◽  
...  
Keyword(s):  
Independent Component Analysis ◽  
Data Acquisition ◽  
Current Distribution ◽  
Spin Exchange ◽  
Healthy Human ◽  
Ecg Signals ◽  
Mode Decomposition ◽  
Magnetometer Array ◽  
Data Acquisition And Processing ◽  
Electrocardiogram Ecg

AbstractIn this study, a wearable multichannel human magnetocardiogram (MCG) system based on a spin exchange relaxation-free regime (SERF) magnetometer array is developed. The MCG system consists of a magnetically shielded device, a wearable SERF magnetometer array, and a computer for data acquisition and processing. Multichannel MCG signals from a healthy human are successfully recorded simultaneously. Independent component analysis (ICA) and empirical mode decomposition (EMD) are used to denoise MCG data. MCG imaging is realized to visualize the magnetic and current distribution around the heart. The validity of the MCG signals detected by the system is verified by electrocardiogram (ECG) signals obtained at the same position, and similar features and intervals of cardiac signal waveform appear on both MCG and ECG. Experiments show that our wearable MCG system is reliable for detecting MCG signals and can provide cardiac electromagnetic activity imaging.

scholarly journals Magnetic Tracking: A Facile Magnetic System for Tracking of Medical Devices (Adv. Mater. Technol. 6/2021)

2021 ◽  
Vol 6 (6) ◽  
pp. 2170033
Author(s):  
Liam Swanepoel ◽  
Nouf Alsharif ◽  
Alexander Przybysz ◽  
Pieter Fourie ◽  
Pierre Goussard ◽  
...  
Keyword(s):  
Medical Devices ◽  
Magnetic System ◽  
Magnetic Tracking

An Optically Aided Magnetic Tracking Approach for Magnetically Actuated Capsule Robot

2021 ◽  
Vol 70 ◽  
pp. 1-9
Author(s):  
Qinyuan Shi ◽  
Tangyou Liu ◽  
Shuang Song ◽  
Jiaole Wang ◽  
Max Q.-H. Meng
Keyword(s):  
Magnetic Tracking ◽  
Magnetically Actuated ◽  
Capsule Robot

Micro-Magnetocardiography System With a Single-Chip SQUID Magnetometer Array for QT Analysis and Diagnosis of Myocardial Injury in Small Animals

2008 ◽  
Vol 2 (4) ◽  
pp. 260-268 ◽  
Author(s):  
Kazuo Komamura ◽  
Yoshiaki Adachi ◽  
Masakazu Miyamoto ◽  
Jun Kawai ◽  
Yasuhiro Haruta ◽  
...  
Keyword(s):  
Myocardial Injury ◽  
Squid Magnetometer ◽  
Small Animals ◽  
Single Chip ◽  
Magnetometer Array

The Possibility of Integrating NV Magnetometer Array by Using Wireless Microwave Excitation and its Application in Remote Heart Sound Records

2021 ◽  
pp. 1-1
Author(s):  
Doudou Zheng ◽  
Qimeng Wang ◽  
Xiaocheng Wang ◽  
Xuemin Wang ◽  
Yanjun Li ◽  
...  
Keyword(s):  
Heart Sound ◽  
Magnetometer Array ◽  
Microwave Excitation

scholarly journals Magnetic Tracking: A Novel Method of Assessing Anterior Cruciate Ligament Deficiency

2006 ◽  
Vol 88 (1) ◽  
pp. 16-17 ◽  
Author(s):  
RK Kundra ◽  
JD Moorehead ◽  
N Barton-Hanson ◽  
SC Montgomery
Keyword(s):  
Anterior Cruciate Ligament ◽  
Tracking System ◽  
Cruciate Ligament ◽  
Magnetic Tracking ◽  
Lachman Test ◽  
Acl Deficiency ◽  
Anterior Tibial ◽  
Anterior Cruciate ◽  
Tracking Device ◽  
Acl Deficient

INTRODUCTION The Lachman test is commonly performed as part of the routine assessment of patients with suspected anterior cruciate ligament (ACL) deficiency. A major drawback is its reliance on the clinician's subjective judgement of movement. The aim of this study was to quantify Lachman movement using a magnetic tracking device thereby providing a more accurate objective measure of movement. PATIENTS AND METHODS Ten patients aged 21–51 years were assessed as having unilateral ACL deficiency with conventional clinical tests. These patients were then re-assessed using a Polhemus Fastrak™ magnetic tracking device. RESULTS The mean anterior tibial displacement was 5.6 mm (SD = 2.5) for the normal knees and 10.2 mm (SD = 4.2) for the ACL-deficient knees. This gave an 82% increase in anterior tibial displacement for the ACL deficient knees. This was shown to be highly significant with P = 0.005. CONCLUSIONS The magnetic tracking system offers an objective quantification of displacements during the Lachman test. It is convenient, non-invasive and comfortable for the patient and is, therefore, ideally suited for use as an investigative tool.

Positioning Accuracy Improvement of Automated Guided Vehicles Based on a Novel Magnetic Tracking Approach

2020 ◽  
Vol 12 (4) ◽  
pp. 138-148 ◽  
Author(s):  
Shijian Su ◽  
Xianping Zeng ◽  
Shuang Song ◽  
Mingqiang Lin ◽  
Houde Dai ◽  
...  
Keyword(s):  
Automated Guided Vehicles ◽  
Accuracy Improvement ◽  
Positioning Accuracy ◽  
Magnetic Tracking

A synoptic study of Pc 3, 4 waves using the Air Force Geophysics Laboratory magnetometer array

1996 ◽  
Vol 101 (A6) ◽  
pp. 13215-13224 ◽  
Author(s):  
P. J. Chi ◽  
C. T. Russell ◽  
G. Le ◽  
W. J. Hughes ◽  
H. J. Singer
Keyword(s):  
Air Force ◽  
Magnetometer Array

scholarly journals Simulation Analysis of Magnetic Gradient Full-Tensor Measurement System

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Lei Xu ◽  
Ning Zhang ◽  
Liqing Fang ◽  
Huadong Chen ◽  
Pengfei Lin ◽  
...  
Keyword(s):  
Magnetic Dipole ◽  
Measurement System ◽  
Measurement Accuracy ◽  
Simulation Analysis ◽  
Magnetic Gradient ◽  
Measurement Systems ◽  
Magnetometer Array ◽  
Array Structure ◽  
Simulation Results ◽  
Planar Measurement

The magnetic gradient full-tensor measurement system is diverse, and the magnetometer array structure is complex. Aimed at the problem, seven magnetic gradient full-tensor measurement system models are studied in detail. The full-tensor measurement theories of the tensor measurement arrays are analyzed. Under the same baseline distance, the magnetic dipole model is used to simulate the measurement system. Based on different measurement systems, the paper quantitatively compares and analyzes the error of the structure. A more optimized magnetic gradient full-tensor measurement system is suggested. The simulation results show that the measurement accuracy of the planar measurement system is slightly higher than that of the stereo measurement system. Among them, the cross-shaped and square measurement systems have relatively smaller structural errors and higher measurement accuracy.

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