Abstract
Both respiratory and cardiac motions reduce the quality and consistency of medical imaging specifically in nuclear medicine imaging. Motion artifacts can be eliminated by gating the image acquisition based on the respiratory phase and cardiac contractions throughout the medical imaging procedure. Electrocardiography (ECG), 3-axis accelerometer, and respiration belt data were processed and analyzed from ten healthy volunteers. Seismocardiography (SCG) is a noninvasive accelerometer-based method that measures accelerations caused by respiration and myocardial movements. This study was conducted to investigate the feasibility of the accelerometer-based method in dual gating technique. The SCG provides accelerometer-derived respiratory (ADR) data and accurate information about quiescent phases within the cardiac cycle. The correct information about the status of ventricles and atria helps us to create an improved estimate for quiescent phases within a cardiac cycle. The correlation of ADR signals with the reference respiration belt was investigated using Pearson correlation. High linear correlation was observed between accelerometer-based measurement and reference measurement methods (ECG and Respiration belt). Above all, due to the simplicity of the proposed method, the technique has high potential to be applied in dual gating in clinical cardiac positron emission tomography (PET) to obtain motion-free images in the future.
Highlights
Motion artifacts decrease the quality of the nuclear medicine imaging
Motion artifacts are the major concern in medical imaging especially in nuclear medicine imaging (PET/computed tomography (CT)) [3]
This study focuses on the extraction of the cardiac and respiration signals from SCG signal which could be valuable for nuclear medicine imaging
Summary
Motion artifacts decrease the quality of the nuclear medicine imaging. The sources of motion cause artifact through the positron emission tomography (PET) or computed tomography (CT) procedures on acquired images. Motion artifacts are the major concern in medical imaging especially in nuclear medicine imaging (PET/CT) [3]. Studied techniques to improve temporal resolution and reduce the motion artifacts include cardiac gating utilizing the ECG gating, respiratory gating, and dual gating. These techniques are mainly based on the investigation of electrical state of the heart, the chest wall movement, and the analysis of emission data in clinical studies, respectively [1, 4,5,6]
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