Augmented Reality Visualization With Image Overlay for MRI-Guided Intervention: Accuracy for Lumbar Spinal Procedures With a 1.5-T MRI System

Fritz, Jan; U-Thainual, Paweena; Ungi, Tamás; Flammang, Aaron; Cho, Nathan B.; Fichtinger, Gabor; Iordachita, Iulian; Carrino, John A.

doi:10.2214/ajr.11.6918

Cited by 58 publications

(27 citation statements)

References 35 publications

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“…Taking the size of the coil into account (Ø = 2 mm, l = 3 mm), an error of 0.8 mm (≤1 pixel) is acceptable. This is also far better than required accuracies for many interventional procedures and comparable to error ranges of similar active tracking systems [15,23]. Reducing the image resolution within the same FoV can result in a broader spatial coverage of the center pixel, and the location found by the system may fall in it rather than the neighbor pixel, thus virtually increasing the accuracy of image guidance.…”

Section: Discussionmentioning

confidence: 76%

Using a low-amplitude RF pulse at echo time (LARFET) for device localization in MRI

Tümer

Sarioğlu

Mutlu

et al. 2014

Med Biol Eng Comput

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We describe a new method for frequency down-conversion of MR signals acquired with the radio-frequency projections method for device localization. A low-amplitude, off-center RF pulse applied simultaneously with the echo signal is utilized as the reference for frequency down-conversion. Because of the low-amplitude and large offset from the Larmor frequency, the RF pulse minimally interfered with magnetic resonance of protons. We conducted an experiment with the coil placed at different positions to verify this concept. The down-converted signal was transformed into optical signal and transmitted via fiber-optic cable to a receiver unit placed outside the scanner room. The position of the coil could then be determined by the frequency analysis of this down-converted signal and superimposed on previously acquired MR images for comparison. Because of minimal positional errors (≤ 0.8 mm), this new device localization method may be adequate for most interventional MRI applications.

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Section: Discussionmentioning

confidence: 76%

Using a low-amplitude RF pulse at echo time (LARFET) for device localization in MRI

Tümer

Sarioğlu

Mutlu

et al. 2014

Med Biol Eng Comput

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“…Shen et al [13] developed an AR-aided implant design and contouring system, including a semi-automatic 3D virtual fracture reduction system to establish the patient-specific anatomical model and a preoperative templating system to create the virtual and real surgical implants, which was consistent with our experimental steps. While Fritz et al [14] applied AR prototype in conjunction with a 1.5-T MRI system and validated its accuracy in human lumbar spine phantom and proved that AR image overlay system could facilitate accurate MRI guidance for successful spinal procedures in a lumbar spine model. In this way, the AR aided is promising to take place the golden standard MRI-guided intervention during surgery, which is convenient and cost-saving.…”

Section: Discussionmentioning

confidence: 99%

Optical augmented reality assisted navigation system for neurosurgery teaching and planning

Geng

Wang

et al. 2013

SPIE Proceedings

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This paper proposed a convenient navigation system for neurosurgeon's pre-operative planning and teaching with augmented reality (AR) technique, which maps the three-dimensional reconstructed virtual anatomy structures onto a skull model. This system included two parts, a virtual reality system and a skull model scence. In our experiment, a 73 year old right-handed man initially diagnosed with astrocytoma was selected as an example to vertify our system. His imaging data from different modalities were registered and the skull soft tissue, brain and inside vessels as well as tumor were reconstructed. Then the reconstructed models were overlayed on the real scence. Our findings showed that the reconstructed tissues were augmented into the real scence and the registration results were in good alignment. The reconstructed brain tissue was well distributed in the skull cavity. The probe was used by a neurosurgeon to explore the surgical pathway which could be directly posed into the tumor while not injuring important vessels. In this way, the learning cost for students and patients' education about surgical risks reduced. Therefore, this system could be a selective protocol for image guided surgery(IGS), and is promising for neurosurgeon's pre-operative planning and teaching.

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“…System Description A prototype MR-compatible, two-dimensional, AR image overlay system was used in conjunction with a clinical 1.5-T MR imaging system (Magnetom Espree; Siemens Healthcare, Erlangen, Germany) (Fig 1a) (10). The virtual needle paths were planned on the MR images of the target joint by using the PerkStation employing 3D Slicer software (version 3.6; http://www.slicer.org) (11) (Figs 1b, 2a).…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, fluoroscopy or computed tomographic (CT) guidance (2,3) result in exposure to ionizing radiation and its associated health risks (4-6). Interventional MR imaging can overcome these limitations by combining joint injection and MR imaging in a single setting (7)(8)(9); however, this typically requires targeting and puncture inside the bore of the magnet (1,7,10). Augmented reality (AR) navigation technology instead can provide MR imaging-guided targeting and joint puncture outside the magnet bore.…”

Section: Joint Injectionsmentioning

confidence: 99%

Augmented Reality Visualization with Use of Image Overlay Technology for MR Imaging–guided Interventions: Assessment of Performance in Cadaveric Shoulder and Hip Arthrography at 1.5 T

Fritz¹,

U-Thainual²,

Ungi³

et al. 2012

Radiology

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MPH Purpose:To prospectively assess overlay technology in providing accurate and efficient targeting for magnetic resonance (MR) imaging-guided shoulder and hip joint arthrography. Materials and Methods:A prototype augmented reality image overlay system was used in conjunction with a clinical 1.5-T MR imager. A total of 24 shoulder joint and 24 hip joint injections were planned in 12 human cadavers. Two operators (A and B) participated, each performing procedures on different cadavers using image overlay guidance. MR imaging was used to confirm needle positions, monitor injections, and perform MR arthrography. Accuracy was assessed according to the rate of needle adjustment, target error, and whether the injection was intraarticular. Efficiency was assessed according to arthrography procedural time. Operator differences were assessed with comparison of accuracy and procedure times between the operators. Mann-Whitney U test and Fisher exact test were used to assess group differences. Results:Forty-five arthrography procedures (23 shoulders, 22 hips) were performed. Three joints had prostheses and were excluded. Operator A performed 12 shoulder and 12 hip injections. Operator B performed 11 shoulder and 10 hip injections. Needle adjustment rate was 13% (six of 45; one for operator A and five for operator B). Target error was 3.1 mm 6 1.2 (standard deviation) (operator A, 2.9 mm 6 1.4; operator B, 3.5 mm 6 0.9). Intraarticular injection rate was 100% (45 of 45). The average arthrography time was 14 minutes (range, 6-27 minutes; 12 minutes [range, 6-25 minutes] for operator A and 16 minutes [range, 6-27 min] for operator B). Operator differences were not significant with regard to needle adjustment rate (P = .08), target error (P = .07), intraarticular injection rate (P . .99), and arthrography time (P = .22). Conclusion:Image overlay technology provides accurate and efficient MR guidance for successful shoulder and hip arthrography in human cadavers.q RSNA, 2012 Supplemental material: http://radiology.rsna.org/lookup /suppl

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Augmented Reality Visualization With Image Overlay for MRI-Guided Intervention: Accuracy for Lumbar Spinal Procedures With a 1.5-T MRI System

Abstract: The augmented reality image overlay system evaluated facilitated accurate MRI guidance for successful spinal procedures in a lumbar spine model. It exhibited potential for simplifying the current practice of MRI-guided lumbar spinal injection procedures.

Cited by 58 publications

References 35 publications

Using a low-amplitude RF pulse at echo time (LARFET) for device localization in MRI

Using a low-amplitude RF pulse at echo time (LARFET) for device localization in MRI

Optical augmented reality assisted navigation system for neurosurgery teaching and planning

Augmented Reality Visualization with Use of Image Overlay Technology for MR Imaging–guided Interventions: Assessment of Performance in Cadaveric Shoulder and Hip Arthrography at 1.5 T

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