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Dear SPM experts, I have got a problem about fMRI with the cardiac trigger. I mean that using the trigger, the TR becomes depending on the heart beats, and so if the heart starts to beat faster or slower , then there is a variable TR that is not constant in time. I would like to know if there is an option in SPM (version 8 or 5) that allowes me to use a variable TR. I don't know what to do. Thank you ! Regards Moreno