scholarly journals Proposed implementation of various imaging modes of OCT on FPGA

2021 ◽  
Author(s):  
Vitaliy Mykhaylychenko
Keyword(s):  
Real Time ◽  
Three Dimensional ◽  
Time Data ◽  
Cross Sectional ◽  
Color Flow ◽  
System Generator ◽  
Data Processor ◽  
Recorded Data ◽  
Time Acquisition

Optical Coherence Tomography (OCT) is three-dimensional imaging technique, capable of producing high resolution cross-sectional images through homogeneous samples, such as biological tissue. Real-time acquisition rates are a significant advantage in OCT. However, when images are generated by first acquiring data and then postprocessed on PC to extract information this advantage is cancelled out. In this project a system which can provide estimation of pixel values for three imaging modes: Structural, Color-flow Doppler and Velocity Variance is designed. The proposed system is standalone data processor using FPGA. The system was designed to process recorded data for verification purposes; however, it can be easily modified to process real-time data. Since the system has three modes of visualization it can be used for detecting in vivo blood flow. The proposed system was completed at MATLAB, Xilinx System Generator (XSG) and VHDL levels and the results show consistency between theoretical results, MATLAB, XSG and VHDL.

scholarly journals Proposed implementation of various imaging modes of OCT on FPGA

2021 ◽  
Author(s):  
Vitaliy Mykhaylychenko
Keyword(s):  
Real Time ◽  
Three Dimensional ◽  
Time Data ◽  
Cross Sectional ◽  
Color Flow ◽  
System Generator ◽  
Data Processor ◽  
Recorded Data ◽  
Time Acquisition

Optical Coherence Tomography (OCT) is three-dimensional imaging technique, capable of producing high resolution cross-sectional images through homogeneous samples, such as biological tissue. Real-time acquisition rates are a significant advantage in OCT. However, when images are generated by first acquiring data and then postprocessed on PC to extract information this advantage is cancelled out. In this project a system which can provide estimation of pixel values for three imaging modes: Structural, Color-flow Doppler and Velocity Variance is designed. The proposed system is standalone data processor using FPGA. The system was designed to process recorded data for verification purposes; however, it can be easily modified to process real-time data. Since the system has three modes of visualization it can be used for detecting in vivo blood flow. The proposed system was completed at MATLAB, Xilinx System Generator (XSG) and VHDL levels and the results show consistency between theoretical results, MATLAB, XSG and VHDL.

P4357Implementation of interactive mixed reality display of three-dimensional echocardiography during percutaneous structural interventions

2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
J D Kasprzak ◽  
M Kierepka ◽  
J Z Peruga ◽  
D Dudek ◽  
B Machura ◽  
...  
Keyword(s):  
Real Time ◽  
Volume Rendering ◽  
Real World ◽  
Mixed Reality ◽  
Transfer Functions ◽  
World View ◽  
Three Dimensional ◽  
Display Device ◽  
Time Data ◽  
Color Flow

Abstract Background Three-dimensional (3D) echocardiographic data acquired from transesophageal (TEE) window are commonly used in planning and during percutaneous structural cardiac interventions (PSCI). Purpose We hypothesized that innovative, interactive mixed reality display can be integrated with procedural PSCI workflow to improve perception and interpretation of 3D data representing cardiac anatomy. Methods 3D TEE datasets were acquired before, during and after the completion of PSCI in 8 patients (occluders: 2 atrial appendage, 2 patent foramen ovale and 3 atrial septal implantations and percutaneous mitral commissurotomy). 30 Carthesian DICOM files were used to test the feasibility of mixed reality with commercially available head-mounted device (overlying hologram of 3D TEE data onto real-world view) as display for the interventional or imaging operator. Dedicated software was used for files conversion and 3D rendering of data to display device (in 1 case real-time Wi-Fi streaming from echocardiograph) and spatial manipulation of hologram during PSCI. Custom viewer was used to perform volume rendering and adjustment (cropping, transparency and shading control). Results Pre- and intraprocedural 3D TEE was performed in all 8 patients (5 women, age 40–83). Thirty selected 3DTEE datasets were successfully transferred and displayed in mixed reality head-mounted device as a holographic image overlying the real world view. The analysis was performed both before and during the procedure and compared with flatscreen 2-D display of the echocardiograph. In one case, real-time data transfer was successfully implemented during mitral balloon commissurotomy. The quality of visualization was judged as good without diagnostic content loss in all (100%) datasets. Both target structures and additional anatomical details were clearly presented including fenestrations of atrial septal defect, prominent Eustachian valve and earlier cardiac implants. Volume rendered views were touchlessly manipulated and displayed with a selection of intensity windows, transfer functions, and filters. Detail display was judged comparable to current 2-D volume-rendering on commercial workstations and touchless user interface - comfortable for optimization of views during PSCI. Conclusions Mixed reality display using a commercially available head-mounted device can be successfully integrated with preparation and execution of PSCI. The benefits of this solution include touchless image control and unobstructed real world viewing facilitating intraprocedural use, thus showing superiority over virtual or enhanced reality solutions. Expected progress includes integration of color flow data and optimization of real-time streaming option.

A Real-Time Photogrammetric System for Acquisition and Monitoring of Three-Dimensional Human Body Kinematics

2021 ◽  
Vol 87 (5) ◽  
pp. 363-373
Author(s):  
Long Chen ◽  
Bo Wu ◽  
Yao Zhao ◽  
Yuan Li
Keyword(s):  
Real Time ◽  
Human Body ◽  
Graphics Processing Unit ◽  
Three Dimensional ◽  
Stereo Pair ◽  
Processing Unit ◽  
Detection Distance ◽  
Human Kinematics ◽  
Graphics Processing ◽  
Time Acquisition

Real-time acquisition and analysis of three-dimensional (3D) human body kinematics are essential in many applications. In this paper, we present a real-time photogrammetric system consisting of a stereo pair of red-green-blue (RGB) cameras. The system incorporates a multi-threaded and graphics processing unit (GPU)-accelerated solution for real-time extraction of 3D human kinematics. A deep learning approach is adopted to automatically extract two-dimensional (2D) human body features, which are then converted to 3D features based on photogrammetric processing, including dense image matching and triangulation. The multi-threading scheme and GPU-acceleration enable real-time acquisition and monitoring of 3D human body kinematics. Experimental analysis verified that the system processing rate reached ∼18 frames per second. The effective detection distance reached 15 m, with a geometric accuracy of better than 1% of the distance within a range of 12 m. The real-time measurement accuracy for human body kinematics ranged from 0.8% to 7.5%. The results suggest that the proposed system is capable of real-time acquisition and monitoring of 3D human kinematics with favorable performance, showing great potential for various applications.

scholarly journals Modern Trends in Imaging V: Optical Coherence Tomography for Rapid Tissue Screening and Directed Histological Sectioning

2012 ◽  
Vol 35 (3) ◽  
pp. 129-143 ◽  
Author(s):  
Woonggyu Jung ◽  
Stephen A. Boppart
Keyword(s):  
Optical Coherence Tomography ◽  
Real Time ◽  
Image Guidance ◽  
Diagnostic Yield ◽  
Imaging Modality ◽  
Imaging Techniques ◽  
Optical Coherence ◽  
Sampling Errors ◽  
Cross Sectional

In pathology, histological examination of the “gold standard” to diagnose various diseases. It has contributed significantly toward identifying the abnormalities in tissues and cells, but has inherent drawbacks when used for fast and accurate diagnosis. These limitations include the lack ofin vivoobservation in real time and sampling errors due to limited number and area coverage of tissue sections. Its diagnostic yield also varies depending on the ability of the physician and the effectiveness of any image guidance technique that may be used for tissue screening during excisional biopsy. In order to overcome these current limitations of histology-based diagnostics, there are significant needs for either complementary or alternative imaging techniques which perform non-destructive, high resolution, and rapid tissue screening. Optical coherence tomography (OCT) is an emerging imaging modality which allows real-time cross-sectional imaging with high resolutions that approach those of histology. OCT could be a very promising technique which has the potential to be used as an adjunct to histological tissue observation when it is not practical to take specimens for histological processing, when large areas of tissue need investigating, or when rapid microscopic imaging is needed. This review will describe the use of OCT as an image guidance tool for fast tissue screening and directed histological tissue sectioning in pathology.

Subcostal real-time three-dimensional echocardiography of interatrial communications: reconstruction of an oval fossa defect, a superior sinus venosus defect with partially anomalous pulmonary venous drainage, an infero-posterior oval fossa defect, and a coronary sinus defect

2011 ◽  
Vol 22 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Karolina M. G. Bilska ◽  
Claudia M. J. Kehrens ◽  
Gillian Riley ◽  
Robert H. Anderson ◽  
Jan Marek
Keyword(s):  
Real Time ◽  
Coronary Sinus ◽  
Three Dimensional ◽  
Venous Drainage ◽  
Sinus Venosus ◽  
Three Dimensional Reconstruction ◽  
Cross Sectional ◽  
Dimensional Reconstruction ◽  
Dimensional Echocardiography ◽  
Three Dimensional Echocardiography

AbstractReal-time three-dimensional echocardiography can surpass simple cross-sectional echocardiography in providing precise details of cardiac lesions. For the purpose of optimising treatment, we describe our findings with real-time three-dimensional echocardiography when interrogating different types of communications permitting interatrial shunting. A three-dimensional reconstruction of defects within the oval fossa enabled reliable identification of location, size, and integrity of surrounding rims. In the superior sinus venosus defect associated with partially anomalous pulmonary venous drainage, three-dimensional reconstruction helped to provide a better understanding of the relationship between the interatrial communication, the orifice of the superior caval vein, and the connections of the right upper pulmonary vein. In the defect opening infero-posteriorly within the oval fossa, three-dimensional reconstruction helped to avoid the risk of potentially inappropriate closure of the defect by suturing the hyperplastic Eustachian valve to the atrial wall, which could have diverted the inferior caval venous return into the left atrium, or obstructed the caval venous orifice. In the coronary sinus defect, three-dimensional echocardiography provided a ‘face to face’ view of the entire coronary sinus roof, showing a circular defect communicating with the cavity of the left atrium. Acquisition of the full-volume data sets took less than 2 minutes for the patients having defects within the oval fossa, and no more than 3 minutes for the patients with the sinus venosus and coronary sinus defects. Post-processing for the defects in the oval fossa took from 5 to 8 minutes, and from 12 to 16 minutes for the more complicated defects.ConclusionCross-sectional two-dimensional echocardiography can establish correct diagnosis in all types of atrial communications; however, real-time three-dimensional reconstruction provides additional value to the surgeon and interventionist for better understanding of spatial intracardiac morphology.

Accuracy of real-time, three-dimensional Doppler echocardiography for stroke volume estimation compared with phase-encoded MRI: an in vivo study

Heart ◽  
2008 ◽  
Vol 94 (9) ◽  
pp. 1212-1213 ◽  
Author(s):  
J Pemberton ◽  
M Jerosch-Herold ◽  
X Li ◽  
L Hui ◽  
M Silberbach ◽  
...  
Keyword(s):  
Stroke Volume ◽  
Real Time ◽  
Doppler Echocardiography ◽  
Three Dimensional ◽  
Volume Estimation ◽  
In Vivo Study

An Explicit Non-Real Time Data Reduction Method of Triple Sensors Hot-Wire Anemometer in Three-Dimensional Flow

1988 ◽  
Vol 110 (2) ◽  
pp. 110-119 ◽  
Author(s):  
Y. T. Chew ◽  
R. L. Simpson
Keyword(s):  
Real Time ◽  
Three Dimensional ◽  
Computation Time ◽  
Reynolds Stresses ◽  
Hot Wire ◽  
Time Data ◽  
Three Dimensional Flow ◽  
Mean Velocity ◽  
Dimensional Flow ◽  
The Mean

An explicit non-real time method of reducing triple sensor hot-wire anenometer data to obtain the three mean velocity components and six Reynolds stresses, as well as their turbulence spectra in three-dimensional flow is proposed. Equations which relate explicitly the mean velocity components and Reynolds stresses in laboratory coordinates to the mean and mean square sensors output voltages in three stages are derived. The method was verified satisfactorily by comparison with single sensor hot-wire anemometer measurements in a zero pressure gradient incompressible turbulent boundary layer flow. It is simple and requires much lesser computation time when compared to other implicit non-real time method.

scholarly journals Feasibility of In Vivo Human Aortic Valve Modeling Using Real-Time Three-Dimensional Echocardiography

2014 ◽  
Vol 97 (4) ◽  
pp. 1255-1258 ◽  
Author(s):  
Arminder S. Jassar ◽  
Melissa M. Levack ◽  
Ricardo D. Solorzano ◽  
Alison M. Pouch ◽  
Giovanni Ferrari ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Real Time ◽  
Three Dimensional ◽  
Valve Modeling ◽  
Dimensional Echocardiography ◽  
Three Dimensional Echocardiography ◽  
Human Aortic Valve

Design on Light Geodesic Instrument Semi-Physical Simulation Training System Based on Virtual Scene

2014 ◽  
Vol 926-930 ◽  
pp. 1517-1521
Author(s):  
Xiang Jin Wang ◽  
Guo Dong Li ◽  
Zhi Lu Zhang ◽  
Zhe Li
Keyword(s):  
Real Time ◽  
Simulation Training ◽  
Physical Simulation ◽  
Low Cost ◽  
Three Dimensional ◽  
General Purpose ◽  
Training System ◽  
Time Data ◽  
Virtual Scene ◽  
Geodesic Instrument

This paper takes the light geodesic instrument as the research object, puts forward a design idea of the semi-physical simulation training system based on the virtual scene and realizes three-dimensional modeling, real-time scene drawing and real-time data driving display through Virtools and Visual C++. ARM7 and the general-purpose single-chip microcomputer are adopted to realize the function simulation of the equipment. This simulation training system has the characteristics of low cost, low power consumption and high simulation degree.

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