Gradient Amplitude Time M xy T 2 * envelope Equal areas
Maxwell Pair Net B field from coils Local fields Current paths B o a3 a Maxwell Pair for dz dB z
Straight wires B o y z Increases B o Reduces B o Straight wires for dy dB z
Conventional Waveform Minimum slew rate waveforms Gradient field: Acoustic noise One of the biggest challenges at high field Acoustic noise –Ear defenders and foam to reduce bone conduction –Gradient system decoupled from bed (and room) –Modification of gradient waveforms –Novel gradient coil designs
Gradients can be combined to produce gradients in arbitrary directions
Slice selection using gradients Sample x x1x1 x2x2 (x 1 ) (x 2 ) BzBz
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