Details

Autor(en) / Beteiligte

• Leong-Kon, Dany

Titel

A software system for real-time cardiac acoustic mapping

Ort / Verlag

ProQuest Dissertations & Theses

Erscheinungsjahr

1997

Link zum Volltext

• ProQuest

Quelle

ProQuest Dissertations & Theses A&I

Beschreibungen/Notizen

• This thesis describes a real-time cardiac acoustic mapping system (RTCAMS) which displays the amplitude of the phonocardiogram (PCG) from the surface of the thorax through an acoustic probe composed of an array of 25 microphones. The essential components of the RTCAMS are the data acquisition, the graphic computation and display of the PCG envelopes and the acoustic maps. These processes are performed in parallel by distributing them in 2 digital signal processors (DSPs) on an add-on board in a personal computer (PC). Parts of the software for the DSPs are written in assembly language to improve the overall speed of the system. A real-time micro-kernel is implemented in the second DSP to improve the use of the DSP resources. As the RTCAMS uses the Microsoft$\rm\sp{TM}$ Windows 3.1 operating system for its graphical user interface on a PC, a virtual device driver was developed to speed up the data transfer between the host PC and the DSPs and a double buffering technique was used to support real-time display of the graphics. Recording from 3 normal subjects was used to test the performance of the system. The preliminary results show that the system can display the spatial distribution of the PCG on the thorax at the speed of 33 frames per second, allowing the study of propagation patterns of the PCG in real time.