Published in:
01-05-2015 | Original Article
A novel respiratory gating method for oncologic positron emission tomography based on bioimpedance approach
Authors:
Tuomas Koivumäki, Jarmo Teuho, Mika Teräs, Marko Vauhkonen, Mikko A. Hakulinen
Published in:
Annals of Nuclear Medicine
|
Issue 4/2015
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Abstract
Objective
Respiratory motion causes loss of image quality and inaccuracy of quantification in oncologic positron emission tomography (PET) imaging. This study introduces a bioimpedance-based gating method for compensation of respiratory motion artefacts.
Methods
The bioimpedance-based respiratory gating method was studied parallel to a clinically used respiratory gating method [Real-time Position Management by Varian Medical Systems] in 4D PET/CT acquisition of 9 oncologic patients. The quantitative analysis consisted of the evaluation of tumour SUVpeak, SUVmax and volume. Additionally, target-to-background ratios as well as motion in cranial–caudal and anterior–posterior directions were measured. The evaluation was performed with amplitude- and time-based gating using averaged attenuation correction maps.
Results
Bioimpedance gating resulted in 17.7–18.9 % increase in mean SUVpeak and 20.0–21.4 % decrease in mean volume compared to non-gated images. The maximum motion measured from the bioimpedance-gated images was 19 mm in cranial–caudal direction and 9 mm in anterior–posterior direction.
Conclusions
Bioimpedance-based respiratory gating compensates the adverse effects of motion in oncologic PET imaging.