Search results for "Image."

Letter: Image-Guided Navigation and Robotics in Spine Surgery.

2020

Prostate Cancer Segmentation from Multiparametric MRI Based on Fuzzy Bayesian Model

2014

International audience

Mechanical thrombectomy for rescue treatment of severe thrombosis of the superior sagittal sinus with the use of Penumbra and AngioJet catheters

2018

Tissue classification by texture and spectral analysis of intracoronary ultrasound radio-frequency data

2002

Imaging of vascular structures by intracoronary ultrasound allows in principal the recognition of different lesion types due to the echomorphology in the B-mode image. The subjective visual diagnosis is often difficult, especially the differentiation between thrombi and non-calcified plaque. The aim of this study was the extraction of features from the ultrasound radio-frequency signal for an objective characterization of coronary tissue. Methods of texture analysis and frequency analysis were used to differentiate red and white thrombi in vitro. Eight texture parameters of first and second order significantly differentiated red and white thrombi. The backscatter transfer function of red th…

Photoaging evaluation by RGB images using a smartphone for photodynamic therapy assessment

2017

In this study was evaluated the photoaging of patients' skins by the processing of RGB images acquired with an optical system based on a smartphone. Two groups were approached: a younger and an older.

Balloon aortic valvuloplasty, Impella insertion and complex coronary intervention: is this all feasible fully percutaneously via upper limb access?

2021

Complex high-risk indicated patients (CHIP) with a limited vascular access constitute a real challenge for percutaneous coronary interventions (PCI), particularly if they require mechanical circulatory support devices. A 73-year-old man with recent non-ST segment elevation myocardial infraction, depressed left ventricular function (ejection fraction, 40%), aortic stenosis (max/mean gradient, 50/32 mm Hg; aortic valve area and its index, 1.0 cm2 and 0.5 cm2/m2) and numerous comorbidities (including recently diagnosed lung cancer in the initial phase) was scheduled by the heart team for balloon aortic valvuloplasty (BAV) and Impella-supported complex PCI of the left main (LM) and the left ant…

Zero-contrast percutaneous coronary intervention of saphenous vein graft in a patient with chronic renal failure

2018

Snapshot Spectral Imaging

2018

This chapter describes an application of the spline-based wavelet frames to the spectral imaging. It presents a method that enables to convert a regular digital camera into a snapshot spectral imager by equipping the camera with a dispersive diffuser and with a compressed sensing-based algorithm for digital processing. The method relies on the assumption that typical images can be sparsely represented in the frame domain. The solution is found from the constrained \(l_{1}\) minimization of a functional by Bregman iterations. Results of optical experiments are reported. The chapter is based on the paper (Golub et al., Appl. Opt. 55, 432–443, (2016), [11]).

Modelling cardiac mechanics of left ventricular noncompaction

2020

Left ventricular noncompaction (LVNC) can be defined as a cardiomyopathy characterised by a pattern of prominent trabecular structure and deep intertrabecular recesses, that is thought to be caused by an arrest of normal endomyocardial morphogenesis. Using patient-specific computational modelling, we assessed the cardiac mechanics of five patients with LVNC and compared myocardial stress and pump performance to those of healthy controls. Findings shown that patients with LVNC have impaired left ventricular (LV) function, making it possible that the lack of fibre shortening of noncompacted layer can determine poor heart function. Pronounced end-systolic wall stress on left ventricular wall o…

Real-Time Augmented Reality for Ear Surgery

2018

International audience; Transtympanic procedures aim at accessing the middle ear structures through a puncture in the tympanic membrane. They require visualization of middle ear structures behind the eardrum. Up to now, this is provided by an oto endoscope. This work focused on implementing a real-time augmented reality based system for robotic-assisted transtympanic surgery. A preoperative computed tomography scan is combined with the surgical video of the tympanic membrane in order to visualize the ossciles and labyrinthine windows which are concealed behind the opaque tympanic membrane. The study was conducted on 5 artificial and 4 cadaveric temporal bones. Initially, a homography framew…