ActiveVessel: a new multimedia workstation for intravascular ultrasound and angiography fusion

Abstract

AcriveVessel is a new multimedia workstation which enables the visualization, acquisition and handling of both image modalities, on-and ofline. It enables DICOM v3.0 decompression and browsing, video acquisition, repmduction and storage for IntraVascular UltraSound (IVUS) and angiograms with their corresponding ECG, automatic catheter segmentation in angiography images (using fast marching algorithm). BSpline models definition for vessel layers on IVUS images sequence and an extensively validated tool to fuse information. This approach defines the correspondence of every IVUS image with its correspondent point in the angiogram and vice versa. The 3 0 reconstruction of the N U S catheterhessel enables real distance measurements as well as threedimensional visualization showing vessel tortuosity in the space. IntroductionIn many clinical scenarios, images from several modalities may be acquired and the diagnostic task is to mentally combine or fuse this information to draw useful clinical conclusions. In particular, in cardiology physicians work on different image modalities none of which contains the complete information about the vascular disease. [I] Our first objective was to develop a new tool to easier the arduous task of conceptualization and mental combination of all this data coming from different instruments. Further, in many instances, this fusion process makes emerge new information that would not been easily deduced.from each image or signal modality by itself.In particular, our aim was to create a new application to fuse the information coming from the angiographic and the intravascular ultrasound equipments. But this first goal has lead us to the creation of Activevessel workstation which incorporates multimedia capabilities as video and audio acquisition, reproduction and storage for angiograms and NUS images with their corresponding ECG signal.It also handles relevant information about the patient and the study. A DICOM v3.0 decompressor and browser has also been implemented to manage angiographic data. An automatic segmentation method for the catheter present in the angiographic images, three-dimensional visualization of the vessel layers (extracted from the N U S information) in the space (incorporating tortuosity coming from the angiographies) in OpenGL and some relevant measurements as real 3D distance between two certain points in the vessel or refereing to a bifurcation, area between vessel layers and exact correspondence between IVUS (in long-and short-axis view) and angiographies are some other relevant capabilities of OUT application. ActiveVesselAs we mention in the introduction, the application has a wide range of capabilities so we will explain them in more detail chronologically from the moment the physician turns it on.As soon as the application starts up the physician decides if hdshe wants to start working online or offline.In the online process, the first thing needed is the information about the study and the patient which is asked by means of a form. As we will see, in the case...

New model for estimating geometric tortuosity of variably saturated porous media using 3D synchrotron microcomputed tomography imaging

“…Several algorithms were reported in the literature to measure geometric tortuosity using 3D volume images. Such algorithms include medial axis (Al-Raoush & Madhoun, 2017;Takahashi et al, 2009), Dijkstra algorithm (Pardo-Alonso et al, 2014), random walk simulation (Promentilla et al, 2016), chessboard distance algorithm (FEI, 2018), and thin-line skeleton (Rotger et al, 2003). Available commercial software use different algorithms for measuring tortuosity from 3D CT images.…”

Relation between plaque type, plaque thickness, blood shear stress, and plaque stress in coronary arteries assessed by X‐ray Angiography and Intravascular Ultrasound

“…The morphological reconstruction of the vessel is assessed by reconstructing the tri-dimensional vessel path, obtained by coupling the IVUS sequence with the corresponding angio-graphic projections. 17 Three pairs of angiographic sequences (each of them lasting at least one cardiac cycle) are required. For each couple of acquisitions, the two projection angles are chosen in order to ensure at least 40 • between them [ Fig.…”

“…17 Three pairs of angiographic sequences (each of them lasting at least one cardiac cycle) are required. For each couple of acquisitions, the two projection angles are chosen in order to ensure at least 40…”

“…The catheter tip is identified by the user, and from that point the catheter segmentation is performed using the fast marching algorithm 33 computed in both angiographic projections of the IVUS catheter. The catheter pathis reconstructed following the methodology proposed by Dumay et al 17 A biplanar spline controlled by n control points is fitted to the data following the undistortion corrections proposed in Ref. 34 [ Fig.…”

“…11 On the other hand, the IVUS sequence, when combined with Angiographic projections, provides a three-dimensional (3D) morphological reconstruction of the vessel. [12][13][14][15][16][17] Such reconstruction, when coupled to biomechanical computational simulations, leads to the estimation of functional indices such as the blood flow dynamic and the vascular and membrane stress acting on the artery.…”