Standardized assessment of new electromagnetic field generators in an interventional radiology setting

Maier-Hein, Lena; Franz, Alfred M.; Birkfellner, Wolfgang; Hummel, Johann; Gergel, Ingmar; Wegner, Ingmar; Meinzer, Hans Peter

doi:10.1118/1.4712222

Cited by 67 publications

(85 citation statements)

References 34 publications

(32 reference statements)

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“…Various automatic registration methods are conceivable 26, 27, 28 and should be compared particularly in terms of their applicability to patient data. In this phantom study, we have selected the rigid coherent point drift registration (CPD),29 which only translates and rotates the dataset of the determined dwell positions by an iterative registration routine minimizing the 3D distance of the dwell position pairs.…”

Section: Methodsmentioning

confidence: 99%

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Kellermeier

Herbolzheimer

Kreppner

et al. 2017

J Applied Clin Med Phys

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Electromagnetic Tracking (EMT) is a novel technique for error detection and quality assurance (QA) in interstitial high dose rate brachytherapy (HDR‐iBT). The purpose of this study is to provide a concept for data acquisition developed as part of a clinical evaluation study on the use of EMT during interstitial treatment of breast cancer patients. The stability, accuracy, and precision of EMT‐determined dwell positions were quantified. Dwell position reconstruction based on EMT was investigated on CT table, HDR table and PDR bed to examine the influence on precision and accuracy in a typical clinical workflow. All investigations were performed using a precise PMMA phantom. The track of catheters inserted in that phantom was measured by manually inserting a 5 degree of freedom (DoF) sensor while recording the position of three 6DoF fiducial sensors on the phantom surface to correct motion influences. From the corrected data, dwell positions were reconstructed along the catheter's track. The accuracy of the EMT‐determined dwell positions was quantified by the residual distances to reference dwell positions after using a rigid registration. Precision and accuracy were investigated for different phantom‐table and sensor‐field generator (FG) distances. The measured precision of the EMT‐determined dwell positions was ≤ 0.28 mm (95th percentile). Stability tests showed a drift of 0.03 mm in the first 20 min of use. Sudden shaking of the FG or (large) metallic objects close to the FG degrade the precision. The accuracy with respect to the reference dwell positions was on all clinical tables < 1 mm at 200 mm FG distance and 120 mm phantom‐table distance. Phantom measurements showed that EMT‐determined localization of dwell positions in HDR‐iBT is stable, precise, and sufficiently accurate for clinical assessment. The presented method may be viable for clinical applications in HDR‐iBT, like implant definition, error detection or quantification of uncertainties. Further clinical investigations are needed.

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Section: Methodsmentioning

confidence: 99%

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Kellermeier

Herbolzheimer

Kreppner

et al. 2017

J Applied Clin Med Phys

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“…This device has shown good performance in terms of accuracy and stability [12], which is required for guiding EUS-related procedures. The TTFG has an ellipsoidal volume of 600x420x600 mm starting at approximately 120 mm from the physical plane of the board.…”

Section: Methodsmentioning

confidence: 99%

“…The most common approach was proposed by Hummel et al [8] and has been used to assess new EM systems [12,13], the accuracy of sensors mounted on US probes [14,15], and also for optimization [16]. This assessment protocol employs a machined base plate to measure positional and rotational tracking data, offering simplicity, reproducibility, a high precision ground truth and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Electromagnetic Tracking Accuracy for Endoscopic Ultrasound

Bonmati

Gurusamy

et al. 2017

Computer-Assisted and Robotic Endoscopy

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Endoscopic ultrasound (EUS) is a minimally-invasive imaging technique that can be technically difficult to perform due to the small field of view and uncertainty in the endoscope position. Electromagnetic (EM) tracking is emerging as an important technology in guiding endoscopic interventions and for training in endotherapy by providing information on endoscope location by fusion with pre-operative images. However, the accuracy of EM tracking could be compromised by the endoscopic ultrasound transducer. In this work, we quantify the precision and accuracy of EM tracking sensors inserted into the working channel of a flexible endoscope, with the ultrasound transducer turned on and off. The EUS device was found to have little (no significant) effect on static tracking accuracy although jitter increased significantly. A significant change in the measured distance between sensors arranged in a fixed geometry was found during a dynamic acquisition. In conclusion, EM tracking accuracy was not found to be significantly affected by the flexible endoscope.

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“…EM tracking reports the location and orientation of a small (∼1-mm diameter) wired sensor inside a 3-D working volume with a magnetic field created by a field generator. Many groups have studied the accuracy of EM tracking in real or simulated clinical settings, [15][16][17][18] as well as configurations in which an EM sensor is embedded in imaging probes. 19 One limitation of EM tracking is the potential distortion of the magnetic field due to ferrous metals and conductive materials inside the working volume.…”

Section: Introductionmentioning

confidence: 99%

Laparoscopic stereoscopic augmented reality: toward a clinically viable electromagnetic tracking solution

et al. 2016

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Abstract. The purpose of this work was to develop a clinically viable laparoscopic augmented reality (AR) system employing stereoscopic (3-D) vision, laparoscopic ultrasound (LUS), and electromagnetic (EM) tracking to achieve image registration. We investigated clinically feasible solutions to mount the EM sensors on the 3-D laparoscope and the LUS probe. This led to a solution of integrating an externally attached EM sensor near the imaging tip of the LUS probe, only slightly increasing the overall diameter of the probe. Likewise, a solution for mounting an EM sensor on the handle of the 3-D laparoscope was proposed. The spatial image-to-video registration accuracy of the AR system was measured to be 2.59 AE 0.58 mm and 2.43 AE 0.48 mm for the leftand right-eye channels, respectively. The AR system contributed 58-ms latency to stereoscopic visualization. We further performed an animal experiment to demonstrate the use of the system as a visualization approach for laparoscopic procedures. In conclusion, we have developed an integrated, compact, and EM tracking-based stereoscopic AR visualization system, which has the potential for clinical use. The system has been demonstrated to achieve clinically acceptable accuracy and latency. This work is a critical step toward clinical translation of AR visualization for laparoscopic procedures.

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Standardized assessment of new electromagnetic field generators in an interventional radiology setting

Abstract: Due to their high accuracy and robustness, the Tabletop FG and the Compact FG could eliminate the need for compensation of EM field distortions in certain CT-guided interventions.

Cited by 67 publications

References 34 publications

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Electromagnetic tracking (EMT) technology for improved treatment quality assurance in interstitial brachytherapy

Assessment of Electromagnetic Tracking Accuracy for Endoscopic Ultrasound

Laparoscopic stereoscopic augmented reality: toward a clinically viable electromagnetic tracking solution

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