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Abstract #4272

Triggering pulse generation by non-contact monitoring of heart rate using an antenna with 600 MHz resonance

Kazuya Okamoto1, Takafumi Ohishi2, Sojuro Kato1, Ryuichi Nanaumi3, Kenji Oyama3, and Kazuhiko Fukutani3
1Advanced MRI Development PJ Team, Canon Medical Systems Corp., Kawasaki, Japan, 2Advanced Technology Research Department, Research and Development Center, Canon Medical Systems Corp., Kawasaki, Japan, 3Medical Products Technology Development Center, R&D Headquarters, Canon Inc., Tokyo, Japan

New non-contact cardiac and respiratory gating method have been developed, which includes an antenna monitoring heart and respiration movement, and independent triggering pulse generation unit with signal processing software. The resonance frequency of the dipole antenna was tuned to around 550MHz on the chest. The triggering pulse generation unit detected and digitized the S11 signals from the antenna. IIR filter removed the low frequency component and a template matching technique was used to seek the triggering points at the inflection point of filtered waveform. As a result, the prospective gating cardiac imaging was successfully performed for volunteers.

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