Int J Comput Assist Radiol Surg - A pilot study on magnetic navigation for transcatheter aortic valve implantation using dynamic aortic model and US image guidance.

Tópicos

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Resumo

RPOSE: In this paper, we propose a pilot study for transcatheter aortic valve implantation guided by an augmented magnetic tracking system (MTS) with a dynamic aortic model and intra-operative ultrasound (US) images.METHODS: The dynamic 3D aortic model is constructed from the preoperative 4D computed tomography, which is animated according to the real-time electrocardiograph (ECG) input of patient. Before the procedure, the US probe calibration is performed to map the US image coordinate to the tracked device coordinate. A temporal alignment is performed to synchronize the ECG signals, the intra-operative US image and the tracking information. Thereafter, with the assistance of synchronized ECG signals, the spatial registration is performed by using a feature-based registration. Then the augmented MTS guides the surgeon to confidently position and deploy the transcatheter aortic valve prosthesis to the target.RESULTS: The approach was validated by US probe calibration evaluation and animal study. The US calibration accuracy achieved [Formula: see text], whereas in the animal study on three porcine subjects, fiducial, target, deployment distance and tilting errors reached [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], respectively.CONCLUSION: Our pilot study has revealed that the proposed approach is feasible and accurate for delivery and deployment of transcatheter aortic valve prosthesis.

Resumo Limpo

rpose paper propos pilot studi transcathet aortic valv implant guid augment magnet track system mts dynam aortic model intraop ultrasound us imagesmethod dynam d aortic model construct preoper d comput tomographi anim accord realtim electrocardiograph ecg input patient procedur us probe calibr perform map us imag coordin track devic coordin tempor align perform synchron ecg signal intraop us imag track inform thereaft assist synchron ecg signal spatial registr perform use featurebas registr augment mts guid surgeon confid posit deploy transcathet aortic valv prosthesi targetresult approach valid us probe calibr evalu anim studi us calibr accuraci achiev formula see text wherea anim studi three porcin subject fiduci target deploy distanc tilt error reach formula see text formula see text formula see text formula see text respectivelyconclus pilot studi reveal propos approach feasibl accur deliveri deploy transcathet aortic valv prosthesi

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