Metric-based evaluation of fiducial markers for medical procedures

Kunz, Christian; Genten, Vera; Meißner, Pascal; Hein, Björn

doi:10.1117/12.2511720

Cited by 10 publications

(5 citation statements)

References 11 publications

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“…With an offset in the millimeter range, we yielded comparable results to those in the previously published literature. 8 As part of the project, other marker libraries such as ArUco were tested, 19 but the experience eventually favored Vuforia. For a future perspective, the use of infrared marker spheres is currently under investigation.…”

Section: Discussionmentioning

confidence: 99%

Augmented reality–assisted ventriculostomy

Schneider

Kunz

Paľa

et al. 2021

Neurosurgical Focus

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OBJECTIVEPlacement of a ventricular drain is one of the most common neurosurgical procedures. However, a higher rate of successful placements with this freehand procedure is desirable. The authors’ objective was to develop a compact navigational augmented reality (AR)–based tool that does not require rigid patient head fixation, to support the surgeon during the operation.METHODSSegmentation and tracking algorithms were developed. A commercially available Microsoft HoloLens AR headset in conjunction with Vuforia marker-based tracking was used to provide guidance for ventriculostomy in a custom-made 3D-printed head model. Eleven surgeons conducted a series of tests to place a total of 110 external ventricular drains under holographic guidance. The HoloLens was the sole active component; no rigid head fixation was necessary. CT was used to obtain puncture results and quantify success rates as well as precision of the suggested setup.RESULTSIn the proposed setup, the system worked reliably and performed well. The reported application showed an overall ventriculostomy success rate of 68.2%. The offset from the reference trajectory as displayed in the hologram was 5.2 ± 2.6 mm (mean ± standard deviation). A subgroup conducted a second series of punctures in which results and precision improved significantly. For most participants it was their first encounter with AR headset technology and the overall feedback was positive.CONCLUSIONSTo the authors’ knowledge, this is the first report on marker-based, AR-guided ventriculostomy. The results from this first application are encouraging. The authors would expect good acceptance of this compact navigation device in a supposed clinical implementation and assume a steep learning curve in the application of this technique. To achieve this translation, further development of the marker system and implementation of the new hardware generation are planned. Further testing to address visuospatial issues is needed prior to application in humans.

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Section: Discussionmentioning

confidence: 99%

Augmented reality–assisted ventriculostomy

Schneider

Kunz

Paľa

et al. 2021

Neurosurgical Focus

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“…where m are the centroids of ground truth landmarks and n are the centroids of physically measured fiducial points (N total points) after performing registration between these spaces. Using the ArUco library, experimental measures of FRE range from 0.27-0.91 mm for 40 cm and 100 cm viewing distances, respectively, with rotational errors between 1.0-3.8 degrees [42]. By combining the contributions from ArUco marker tracking, we expect a similar FRE of 0.27-0.91 mm for our proposed viewing distance.…”

Section: Discussionmentioning

confidence: 73%

Head-Mounted Display-Based Augmented Reality for Image-Guided Media Delivery to the Heart: A Preliminary Investigation of Perceptual Accuracy

Doughty

Ghugre

2022

J. Imaging

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By aligning virtual augmentations with real objects, optical see-through head-mounted display (OST-HMD)-based augmented reality (AR) can enhance user-task performance. Our goal was to compare the perceptual accuracy of several visualization paradigms involving an adjacent monitor, or the Microsoft HoloLens 2 OST-HMD, in a targeted task, as well as to assess the feasibility of displaying imaging-derived virtual models aligned with the injured porcine heart. With 10 participants, we performed a user study to quantify and compare the accuracy, speed, and subjective workload of each paradigm in the completion of a point-and-trace task that simulated surgical targeting. To demonstrate the clinical potential of our system, we assessed its use for the visualization of magnetic resonance imaging (MRI)-based anatomical models, aligned with the surgically exposed heart in a motion-arrested open-chest porcine model. Using the HoloLens 2 with alignment of the ground truth target and our display calibration method, users were able to achieve submillimeter accuracy (0.98 mm) and required 1.42 min for calibration in the point-and-trace task. In the porcine study, we observed good spatial agreement between the MRI-models and target surgical site. The use of an OST-HMD led to improved perceptual accuracy and task-completion times in a simulated targeting task.

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“…Nowadays, fiducial tags such as ARTags, AprilTags, or ArUcos are used (see Figure 2a), that all have their strengths and weaknesses as investigated, for example, in [62][63][64][65][66]. In this work, AprilTags are used as they perform comparably well in terms of accurate and robust pose detections; see, for example, [67]. AprilTags [68][69][70] are special types of visual fiducial tags such as barcodes or QR-codes.…”

Section: Visual Fiducial Markersmentioning

confidence: 99%

High-Precision Absolute Pose Sensing for Parallel Mechanisms

Schempp

Schulz

2022

Sensors

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A parallel mechanism’s pose is usually obtained indirectly from the active joints’ coordinates by solving the direct kinematics problem. Its accuracy mainly depends on the accuracy of the measured active joints’ coordinates, the tolerances in the active and passive joints, possible backlash, axes misalignment, limb deformations due to stress or temperature, the initial pose estimate that is used for the numerical method, and the accuracy of the kinematic model itself. Backlash and temperature deformations in the active joints especially hinder high-precision applications as they usually cannot be observed. By implementing a camera module on the base platform and an array of fiducial tags on the moveable manipulator platform of a parallel mechanism, a highly accurate, direct, and absolute pose measurement system can be obtained that can overcome those limitations. In this paper, such a measurement system is proposed, designed, and its accuracy is investigated on a state-of-the-art H-811.I2 6-axis miniature hexapod by Physik Instrumente (PI) GmbH & Co. KG.

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Metric-based evaluation of fiducial markers for medical procedures

Cited by 10 publications

References 11 publications

Augmented reality–assisted ventriculostomy

Augmented reality–assisted ventriculostomy

Head-Mounted Display-Based Augmented Reality for Image-Guided Media Delivery to the Heart: A Preliminary Investigation of Perceptual Accuracy

High-Precision Absolute Pose Sensing for Parallel Mechanisms

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