Magnetic Tracking System for Radiation Therapy

  title={Magnetic Tracking System for Radiation Therapy},
  author={Wing-Fai Loke and Tae-Young Choi and Teimour Maleki and Lech Papiez and Babak Ziaie and Byunghoo Jung},
  journal={IEEE Transactions on Biomedical Circuits and Systems},
Intensity-modulated radiation therapy (IMRT) requires precise delivery of the prescribed dose of radiation to the target and surrounding tissue. Irradiation of moving body anatomy is possible only if stable, accurate, and reliable information about the moving body structures are provided in real time. This paper presents a magnetic position tracking system for radiation therapy. The proposed system uses only four transmitting coils and an implantable transponder. The four transmitting coils… 
A 0.5-V sub-mW wireless magnetic tracking transponder for radiation therapy
A 0.5-V sub-mW wireless active transponder for a magnetic tracking system is designed in 130-nm CMOS technology to track the position of the tumor.
Microsystems technology in radiation therapy
  • T. Maleki, B. Ziaie
  • Physics, Engineering
    2010 Annual International Conference of the IEEE Engineering in Medicine and Biology
  • 2010
Three micro-devices are discussed: a self-biased solid state dosimeter to be used for wireless monitoring of the delivered dose, an electromagnetic tracking system to locate the position of tumor in real-time, and a Guyton-chamber-embedded capacitive pressure sensor for wireless measurement of interstitial pressure inside a tumor.
Magnetic tracking for TomoTherapy systems: gradiometer based methods to filter eddy-current magnetic fields.
The results indicate that the gradiometer method merits further studies and work due to the accuracy achieved with ideal sensors, and localization results using a 5 × 5 array of gradiometers are, in general, 2-4 times more accurate than a planar array of sensors, depending on the solenoid orientation and position.
Averaging position algorithm of an independent rotating coils based electromagnetic tracking system
When it comes to the navigation tool for minimally invasive surgery, electromagnetic tracking has prominent advantages and features over the traditional endoscope and X-ray imaging. The
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A simulator was developed and used to analyze the theoretical system performances in electromagnetic tracking, and an optimization of the spatial arrangement of the transmitter coils was performed to improve the tracking accuracy.
A novel method for tumor localization and tracking in radiation therapy
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A Microwave Imaging-Based Technique to Localize an In-Body RF Source for Biomedical Applications
The root-mean-square of the error distance between the actual and the estimated position is found to be within 10 and 4 mm for the circular and the realistic phantom, respectively, showing the capability of the proposed algorithm to work with a good accuracy even in the presence of noise for the localization of the in-body RF source.
Magnetic Tracking Inside Conducting Bores for Radiotherapy Tumor Localization Systems
Magnetic tracking is sensitive to the eddy currents induced on the conducting gantry during radiotherapy tumor localization. We propose a unique magnetic tracking method that can resist the eddy
An Electromagnetic Tracking Method Using Rotating Orthogonal Coils
In this paper, an electromagnetic tracking method that uses two rotating orthogonal coils is proposed. Two cross-shaped coils can rotate together and be driven in sequence to generate a magnetic


Wireless magnetic tracking system for radiation therapy
This paper presents a wireless position and orientation tracking system for radiation therapy that uses only four transmitting coils and an implantable wireless transponder to track the tumor in real time.
Accuracy of a wireless localization system for radiotherapy.
Three-dimensional magnetic tracking of biaxial sensors
We present an analytical (noniterative) method for tracking biaxial magnetic sensors. Low-resolution regions (LRRs) of a biaxial transmitter are determined for the tracking of a triaxial sensor.
A novel tracking technique for the continuous precise measurement of tumour positions in conformal radiotherapy.
A novel tracking technique is developed which will allow to measure tumour positions directly and continuously with high resolution in space and time and can also be used to survey and monitor the patient positioning.
A new method for magnetic position and orientation tracking
The method is based on two-axis generation of a quasi-static rotating magnetic field and three-axis sensing. Two mutually orthogonal coils fed with phase-quadrature currents comprise the excitation
Tumor motion ranges due to respiration and respiratory motion characteristics
This chapter reviewed the literature to determine known tumor motion amplitudes for lung, liver, and pancreas and concluded that a subset of all patients could have been treated using skeletal structure tracking, rather than implanted fiducials, and a PTV margin in the range of the stated tracking accuracy for Synchrony.
Electromagnetic tracking system and method using a single-coil transmitter
An electromagnetic tracking system and method using a single transmitter coil for processing the signal received by the receiver and a receiver for receiving a signal from a single transmitters coil is provided.
A new method for eye location tracking
The suggested method differs from traditional ones where the eye location is computed indirectly, relative to the measured location and orientation of a transitional three-axial magnetic sensor attached to the subject's head, and eliminates systematic errors caused by imperfect orthogonality of the transitional sensor.
A real-time dynamic-MLC control algorithm for delivering IMRT to targets undergoing 2D rigid motion in the beam's eye view.
An MLC control algorithm for delivering intensity modulated radiation therapy (IMRT) to targets that are undergoing two-dimensional (2D) rigid motion in the beam's eye view (BEV) is presented and is robust in the sense that it does not rely on a high level of agreement between the target motion measured during treatment planning and delivery.
Treating tumors that move with respiration
Stereotactic Radiosurgery for Early Stage Non-Small Cell Lung Cancer: Rationale, Patient Selection, Results and Complications, and Toxicity and Efficacy.