Cardiac Motion Effects in Multi-Slice Medical CT Imaging Applications

Effets du mouvement cardiaque en tomodensitométrie médicale multicouche

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Authors
  1. Stergiopoulos, S.
  2. Younis, W.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
This report presents processing concepts that have the potential to remove artifacts due to cardiac motion in multi-slice x-ray CT medical imaging applications and produce better quality diagnostic images. By using signal processing techniques, the CT projection data sets, associated with the diastole phase of the cardiac cycle, when the heart is moving the least, are identified automatically and without ECG triggering and used by image reconstruction algorithms to produce transverse images of the chest area. In this report, two different techniques have been suggested for the identification of the phases of the cardiac cycle and both produce identical results. The first technique employs the concept of the spatial overlap correlator (SOC) followed by a special unwrapping filter while the second technique exploits the property of constant attenuation of the Radon transform in order to track the phases of cardiac motion. Comparison of these two techniques with the conventional approach, known as ECG retrospective gating (which uses ECG signal to track cardiac phase), shows more accurate tracking of cardiac phases. The present material extends the processing concept introduced in [21] and [22] on correction of motion artifacts from single-slice CT into multi-slice helical CT medical imaging applications. These new processing concepts were tested with the 3D Shepp Logan phantom as well as human patient’s data and were successful in identifying the projection data associated wi

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Keywords
2D Shepp-Logan Phantom;3D Shepp Logan phantom;3D visualization;180o Interpolation algorithm;360o Interpolation algorithm;arrhythmia;beta blocker therapy;calcium scoring;cardiac motion;cardiac cycle;Computed Tomography (CT) systems;constant attenuation property of the Radon Transform;coronary calcification;CT Image Reconstruction;diastole phase;ECG triggering;Electron Beam CT (EBCT) scanner;fan beam projection;Fast Fourier Transforms (FFT);filtered back projection algorithm;helical CT;interpolation algorithms;motion artifacts;multi-slice helical CT;multi-slice x-ray CT;Nyquist criterion;parallel beam projection;projection data sets;Radon transform;Ram-Lak filter;rebinning process;retrospective gating (RG-ECG);single-slice CT Scanner;sinograms;spatial overlap correlator (SOC);spatial overlap correlator with unwrapping filter;tracking the phases of cardiac motion;unwrapping filter
Report Number
DRDC-TORONTO-TR-2008-104 — Technical Report
Date of publication
01 Jun 2008
Number of Pages
63
DSTKIM No
CA032533
CANDIS No
531714
Format(s):
Electronic Document(PDF)

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