44.13 In the context of an MRI, which one of the following does the TR time rep- resent? (a) The time between successive 90 pulses. (b) The time between the 90 ° pulse and the 180° pulse. (c) The time between the 180° pulse and the 'echo' signal. (d) The time between the 90 °pulse and the 'echo' signal. (e) The time it takes to perform the MRI scan.

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