Association of transaortic approach and transoesophageal echocardiography as the primary imaging technique for improved results in transcatheter valve implantation. (57/113)

OBJECTIVES: The transaortic access has been proposed to perform transcatheter aortic valve implantation in patients with no other available access. We hypothesize that its coupling with transoesophageal echocardiographic guidance may further reduce procedure-related morbidity. METHODS: Transoesophageal echocardiography was adopted as the primary imaging modality to produce high-resolution images and to guide the deployment of the transcatheter valve. This imaging modality allows continuous visualization not only of the prosthesis and of the delivery system, but also of the surrounding anatomical landmarks (aortic annulus, sinotubular junction and anterior mitral leaflet). RESULTS: We report an initial series of eight patients, who were treated by a transaortic delivery of the transcatheter valve (SAPIEN Valve, Edwards Lifesciences Inc., Irvine, CA, USA) through an upper mini-sternotomy and guided by transoesophageal echocardiography. The procedure was uneventful in all patients; there were no cases of access site morbidity, periprocedural stroke or renal failure. CONCLUSIONS: The association of the transaortic route and the transoesophageal echo guidance has the potential to improve the results of transcatheter valve implantation, and deserves further investigation.  (+info)

The U sign: tenth landmark to the central region on brain surface reformatted MR imaging. (58/113)

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Multimodal registration of three-dimensional maxillodental cone beam CT and photogrammetry data over time. (59/113)

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Computerized estimation of patient setup errors in portal images based on localized pelvic templates for prostate cancer radiotherapy. (60/113)

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Intraoperative C-arm cone-beam computed tomography: quantitative analysis of surgical performance in skull base surgery. (61/113)

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Evaluation of the geometric accuracy of anatomic landmarks as surrogates for intrapulmonary tumors in image-guided radiotherapy. (62/113)

OBJECTIVES: The purpose of this study was to evaluate the geometric accuracy of thoracic anatomic landmarks as target surrogates of intrapulmonary tumors for manual rigid registration during image-guided radiotherapy (IGRT). METHODS: Kilovolt cone-beam computed tomography (CBCT) images acquired during IGRT for 29 lung cancer patients with 33 tumors, including 16 central and 17 peripheral lesions, were analyzed. We selected the "vertebrae", "carina", and "large bronchi" as the candidate surrogates for central targets, and the "vertebrae", "carina", and "ribs" as the candidate surrogates for peripheral lesions. Three to six pairs of small identifiable markers were noted in the tumors for the planning CT and Day 1 CBCT. The accuracy of the candidate surrogates was evaluated by comparing the distances of the corresponding markers after manual rigid matching based on the "tumor" and a particular surrogate. Differences between the surrogates were assessed using 1-way analysis of variance and post hoc least-significant-difference tests. RESULTS: For central targets, the residual errors increased in the following ascending order: "tumor", "bronchi", "carina", and "vertebrae"; there was a significant difference between "tumor" and "vertebrae" (p=0.010). For peripheral diseases, the residual errors increased in the following ascending order: "tumor", "ribs", "vertebrae", and "carina". There was a significant difference between "tumor" and "carina" (p=0.005). CONCLUSIONS: The "bronchi" and "carina" are the optimal surrogates for central lung targets, while "ribs" and "vertebrae" are the optimal surrogates for peripheral lung targets for manual matching of online and planned tumors.  (+info)

Ultrasound-guided combined intermediate and deep cervical plexus nerve block for regional anaesthesia in oral and maxillofacial surgery. (63/113)

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Role of buccal corridor in smile esthetics and its correlation with underlying skeletal and dental structures. (64/113)

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