Template for MR Visualization and Needle Targeting

Li, Rui; Xu, Sheng; Bakhutashvili, Ivane; Türkbey, İsmail Barış; Choyke, Peter L.; Pinto, Peter A.; Wood, Bradford J.; Tse, Zion Tsz Ho

doi:10.1007/s10439-018-02167-z

Cited by 6 publications

(6 citation statements)

References 36 publications

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“…The average error is near the expected tolerable error and is in the range of potential clinical relevance, depending on the need for accuracy. Other systems for improved accuracy of TP biopsies include a grid template with a 3 mm target distance error in a phantom study 22 and a robotics with a 2 mm error in a phantom study. 23 , 24 However, our HoloLens AR system only provides visual guidance, without any hardware or physical constraints.…”

Section: Discussionmentioning

confidence: 99%

HoloLens augmented reality system for transperineal free-hand prostate procedures

Mehralivand

et al. 2023

J. Med. Imag.

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Purpose: An augmented reality (AR) system was developed to facilitate free-hand real-time needle guidance for transperineal prostate (TP) procedures and to overcome the limitations of a traditional guidance grid.Approach: The HoloLens AR system enables the superimposition of annotated anatomy derived from preprocedural volumetric images onto a patient and addresses the most challenging part of free-hand TP procedures by providing real-time needle tip localization and needle depth visualization during insertion. The AR system accuracy, or the image overlay accuracy (n ¼ 56), and needle targeting accuracy (n ¼ 24) were evaluated within a 3D-printed phantom. Three operators each used a planned-path guidance method (n ¼ 4) and free-hand guidance (n ¼ 4) to guide needles into targets in a gel phantom. Placement error was recorded. The feasibility of the system was further evaluated by delivering soft tissue markers into tumors of an anthropomorphic pelvic phantom via the perineum. Results:The image overlay error was 1.29 AE 0.57 mm, and needle targeting error was 2.13 AE 0.52 mm. The planned-path guidance placements showed similar error compared to the free-hand guidance (4.14 AE 1.08 mm versus 4.20 AE 1.08 mm, p ¼ 0.90). The markers were successfully implanted either into or in close proximity to the target lesion.Conclusions: The HoloLens AR system can provide accurate needle guidance for TP interventions. AR support for free-hand lesion targeting is feasible and may provide more flexibility than grid-based methods, due to the real-time 3D and immersive experience during free-hand TP procedures.

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Section: Discussionmentioning

confidence: 99%

HoloLens augmented reality system for transperineal free-hand prostate procedures

Mehralivand

et al. 2023

J. Med. Imag.

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“…4,[6][7][8]26,27 The anatomical accuracy of the prostheses, which may affect the appearance of the prostheses, is limited by the accuracy of the 3D scanner (0.05 mm) 19 and 3D printer (0.05 mm). 21 This can be improved using a 3D scanner and 3D printer with higher accuracy.…”

Section: Discussionmentioning

confidence: 99%

“…The inner and outer molds were fabricated by a stereolithography (SLA) 3D printer (Form 2 by Formlabs, Somerville, MA), with an accuracy of 0.05 mm 21 and a layer height of 0.025 mm, as shown in Figure 2(d) with resin (Clear Resin by Formlabs). The 3D-printed inner and outer molds (Figure 2(d)) were assembled (Figure 2(e)) based on the pin-hole alignments.…”

Section: Methodsmentioning

confidence: 99%

“…The inner and outer molds were fabricated by a stereolithography (SLA) 3D printer (Form 2 by Formlabs, Somerville, MA), with an accuracy of 0.05 mm 21 To simplify the mold design in CAD and avoid a visible parting line in the finished prosthesis, the mold needs to be cracked open when obtaining the prosthesis and cannot be reused after the molding process, although the mold can be reprinted. When a reusable mold is desired, a 3-part mold design can be considered.…”

Section: D Printing Of Molds and Molding Of The Prosthetic Fingersmentioning

confidence: 99%

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Fabrication and assessment of partial finger prostheses made using 3D-printed molds: A case study

Putra

Montgomery

Kalamdani

et al. 2023

Prosthetics &Amp; Orthotics International

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3D printing for custom prosthetic finger fabrication can have better fit and comfort than non-custom off-the-shelf ones while reducing fabrication labor time. The purpose of this case study was (1) to design and fabricate custom prosthetic fingers using 3D-printed molds for the treatment of partial finger amputation; (2) to evaluate patient satisfaction of the custom prosthetic fingers fabricated using 3D-printed molds and compare them to the custom prosthetic fingers fabricated through a conventional method of molding using plaster casts. The method to develop the custom prosthetic finger are as follows: (1) The shapes of the residual digits and contralateral fingers were acquired using a highresolution 3D optical scanner. (2) Prosthetic fingers were designed by modifying the model of the residual digits and the contralateral fingers.(3) Molds of the prosthetic fingers were designed using computer-aided design software and fabricated by 3D printing. The study compared hand function tests and rehabilitation outcome surveys to evaluate the performance of the prosthetic fingers fabricated using 3D-printed molds and plaster casts. This case suggests that the prosthetic fingers fabricated using 3D-printed molds had comparable performance to the prosthetic fingers fabricated using plaster casts. The aesthetics and transparency of the prosthetic fingers contributed highly to the low satisfaction of the prosthetic fingers fabricated using 3D-printed molds.

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“…Preliminary data was first reported as an oral presentation at the 2019 International Symposium on Medical Robotics as the proof of concept. 25 The goal of the presented method was to achieve a comparable localization accuracy and cost but higher resolution compared with the template approaches, which usually have a localization accuracy of around 3 mm, resolution of 2-5 mm, 9,18,21,22 and cost of $10-$30 per piece.…”

Section: Introductionmentioning

confidence: 99%

The Feasibility of Using a Smartphone Magnetometer for Assisting Needle Placement

Zhao

Wood

et al. 2019

Ann Biomed Eng

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Minimally invasive surgical procedures often require needle insertion. For these procedures, efficacy greatly depends on precise needle placement. Many methods, such as optical tracking and electromagnetic tracking, have been applied to assist needle placement by tracking the realtime position information of the needle. Compared with the optical tracking method, electromagnetic tracking is more suitable for minimally invasive surgery since it has no requirement of line-of-sight. However, the devices needed for electromagnetic tracking are usually expensive, which will increase the cost of surgery. In this study, we presented a lowcost smartphone-based permanent magnet tracking method compatible with CT imaging and designed a 3D printed operation platform to assist with needle placement prior to needle insertion during minimally invasive surgery. The needle positioning accuracy of this method was tested in an open air test and a prostate phantom test in a CT environment. For these two tests, the average radial errors were 0.47 and 2.25 mm, respectively, and the standard deviations were 0.29 and 1.63, respectively. The materials and fabrication required for the presented method are inexpensive. Thus, many image-guided therapies may benefit from the presented method as a low-cost option for needle positioning prior to needle insertion.

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Template for MR Visualization and Needle Targeting

Cited by 6 publications

References 36 publications

HoloLens augmented reality system for transperineal free-hand prostate procedures

HoloLens augmented reality system for transperineal free-hand prostate procedures

Fabrication and assessment of partial finger prostheses made using 3D-printed molds: A case study

The Feasibility of Using a Smartphone Magnetometer for Assisting Needle Placement

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