Int J Comput Assist Radiol Surg - A low-cost tracked C-arm (TC-arm) upgrade system for versatile quantitative intraoperative imaging.

Tópicos

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Resumo

RPOSE: C-arm fluoroscopy is frequently used in clinical applications as a low-cost and mobile real-time qualitative assessment tool. C-arms, however, are not widely accepted for applications involving quantitative assessments, mainly due to the lack of reliable and low-cost position tracking methods, as well as adequate calibration and registration techniques. The solution suggested in this work is a tracked C-arm (TC-arm) which employs a low-cost sensor tracking module that can be retrofitted to any conventional C-arm for tracking the individual joints of the device.METHODS: Registration and offline calibration methods were developed that allow accurate tracking of the gantry and determination of the exact intrinsic and extrinsic parameters of the imaging system for any acquired fluoroscopic image. The performance of the system was evaluated in comparison to an Optotrak[Formula: see text] motion tracking system and by a series of experiments on accurately built ball-bearing phantoms. Accuracies of the system were determined for 2D-3D registration, three-dimensional landmark localization, and for generating panoramic stitched views in simulated intraoperative applications.RESULTS: The system was able to track the center point of the gantry with an accuracy of [Formula: see text] mm or better. Accuracies of 2D-3D registrations were [Formula: see text] mm and [Formula: see text]. Three-dimensional landmark localization had an accuracy of [Formula: see text] of the length (or [Formula: see text] mm) on average, depending on whether the landmarks were located along, above, or across the table. The overall accuracies of the two-dimensional measurements conducted on stitched panoramic images of the femur and lumbar spine were 2.5 [Formula: see text] 2.0 % [Formula: see text] and [Formula: see text], respectively.CONCLUSION: The TC-arm system has the potential to achieve sophisticated quantitative fluoroscopy assessment capabilities using an existing C-arm imaging system. This technology may be useful to improve the quality of orthopedic surgery and interventional radiology.

Resumo Limpo

rpose carm fluoroscopi frequent use clinic applic lowcost mobil realtim qualit assess tool carm howev wide accept applic involv quantit assess main due lack reliabl lowcost posit track method well adequ calibr registr techniqu solut suggest work track carm tcarm employ lowcost sensor track modul can retrofit convent carm track individu joint devicemethod registr offlin calibr method develop allow accur track gantri determin exact intrins extrins paramet imag system acquir fluoroscop imag perform system evalu comparison optotrakformula see text motion track system seri experi accur built ballbear phantom accuraci system determin dd registr threedimension landmark local generat panoram stitch view simul intraop applicationsresult system abl track center point gantri accuraci formula see text mm better accuraci dd registr formula see text mm formula see text threedimension landmark local accuraci formula see text length formula see text mm averag depend whether landmark locat along across tabl overal accuraci twodimension measur conduct stitch panoram imag femur lumbar spine formula see text formula see text formula see text respectivelyconclus tcarm system potenti achiev sophist quantit fluoroscopi assess capabl use exist carm imag system technolog may use improv qualiti orthoped surgeri intervent radiolog

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