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A Novel Approach for 3D-Structural Identification through Video Recording: Magnified Tracking.

ABSTRACT: Advancements in optical imaging devices and computer vision algorithms allow the exploration of novel diagnostic techniques for use within engineering systems. A recent field of application lies in the adoption of such devices for non-contact vibrational response recordings of structures, allowing high spatial density measurements without the burden of heavy cabling associated with conventional technologies. This, however, is not a straightforward task due to the typically low-amplitude displacement response of structures under ambient operational conditions. A novel framework, namely Magnified Tracking (MT), is proposed herein to overcome this limitation through the synergistic use of two computer vision techniques. The recently proposed phase-based motion magnification (PBMM) framework, for amplifying motion in a video within a defined frequency band, is coupled with motion tracking by means of particle tracking velocimetry (PTV). An experimental campaign was conducted to validate a proof-of-concept, where the dynamic response of a shear frame was measured both by conventional sensors as well as a video camera setup, and cross-compared to prove the feasibility of the proposed non-contact approach. The methodology was explored both in 2D and 3D configurations, with PTV revealing a powerful tool for the measurement of perceptible motion. When MT is utilized for tracking "imperceptible" structural responses (i.e., below PTV sensitivity), via the use of PBMM around the resonant frequencies of the structure, the amplified motion reveals the operational deflection shapes, which are otherwise intractable. The modal results extracted from the magnified videos, using PTV, demonstrate MT to be a viable non-contact alternative for 3D modal identification with the benefit of a spatially dense measurement grid.

SUBMITTER: Harmanci YE

PROVIDER: S-EPMC6427300 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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A Novel Approach for 3D-Structural Identification through Video Recording: Magnified Tracking.

Harmanci Yunus Emre YE Gülan Utku U Holzner Markus M Chatzi Eleni E

Sensors (Basel, Switzerland) 20190311 5

Advancements in optical imaging devices and computer vision algorithms allow the exploration of novel diagnostic techniques for use within engineering systems. A recent field of application lies in the adoption of such devices for non-contact vibrational response recordings of structures, allowing high spatial density measurements without the burden of heavy cabling associated with conventional technologies. This, however, is not a straightforward task due to the typically low-amplitude displace ...[more]

PMID: 30862051

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Project description:BackgroundTuberculum sellae meningiomas have an incidence from 5 to 10% of all intracranial meningiomas[2] and tend to be surgically difficult and challenging tumors given their proximity to important structures such as the internal carotid artery (ICA), anterior cerebral artery (ACA), and optic nerves.[3] Typically, their growth is posteriorly and superiorly oriented, thereby displacing the optic nerves and causing visual dysfunction, which is the primary indication for surgical treatment.[1] The main goals of the treatment are the preservation or restoration of visual abilities and a complete tumor resection.[1] Conventionally, surgical approaches to tuberculum meningiomas involve largely invasive extended bifrontal, interhemispheric, orbitozygomatic, pterional, and subfrontal eyebrow approaches. The supraorbital craniotomy, however, is a minimally invasive transcranial approach that offers a similar surgical corridor to conventional transcranial approaches, using a limited craniotomy and minimal brain retraction that can be used for tumoral and vascular pathologies,[4,5] offering added cosmetic outcomes.[1] We present the case of a patient undergoing a supraorbital transciliary craniotomy with a tuberculum sellae meningioma causing bitemporal hemianopsia.Case descriptionA 70-year-old female with chronic headaches and progressive vision loss and visual field deficit for about 1 year. On ophthalmological evaluation, she was able to fixate and follow objects with each eye, light perception was only present in the right eye, and the vision in the left eye was 0.2 decimal units. Her visual fields demonstrated severe campimetric deficits. Her extraocular movements were intact and bilateral pupils were equal, round, and reactive to light. MRI of the brain demonstrated tuberculum sellae meningioma with bilateral optic canal invasion, displacing the chiasm, and extending ≥180° around the medial ICA wall and anterior ACA wall. The patient underwent supraorbital transciliary keyhole approach for total resection of the tumor. Postoperatively, visual acuity and visual field were significantly improved.ConclusionPerforming a supraorbital transciliary keyhole craniotomy for tuberculum sellae meningiomas requires an adequate and meticulous preoperative planning to determine the optimal surgical corridor to the lesion. The use of supraorbital craniotomy is safe with good cosmetic results and potentially lower morbidity allowing for adequate exposure, resection, and release of neurovascular structures.

Dataset Information

A Novel Approach for 3D-Structural Identification through Video Recording: Magnified Tracking.

Publications

A Novel Approach for 3D-Structural Identification through Video Recording: Magnified Tracking.

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