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Respiratory Gating for 3-Dimensional PET of the Thorax: Feasibility and Initial Results

Luc Boucher, MD, Serge Rodrigue, Roger Lecomte, PhD and François Bénard, MD

Metabolic and Functional Imaging Center, Clinical Research Center, Centre Hospitalier Universitaire de Sherbrooke, Sherbrooke, Quebec, Canada



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  		FIGURE 1. Respiratory gating device built to trigger gated acquisition at the start of each breathing cycle. A high-sensitivity thermistor was installed at the inlet of a conventional disposable oxygen face mask. This thermistor was connected to a simple circuit equipped with a discriminator and a variable-resistance dial, powered by 5 V with AA batteries. The output of this circuit was fed to the 5-V input of the PET scanner.

 


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  		FIGURE 2. Respiratory gating of 3D projections of the thorax acquired with the respiratory gating device. The motion of the heart (upper panel) and the right kidney (lower panel) is shown. The dotted line represents the initial position of these organs at the start of the breathing cycle; the solid line represents the maximal vertical amplitude of the respiratory motion.

 


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  		FIGURE 3. Bar graph showing the maximal activity concentrations measured in the spheres in a phantom study simulating the subject with the largest respiratory amplitude (white bars) in comparison with the same measurements obtained without simulated respiratory motion (black bars).

 




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