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Data acquisition from REST slab or after a fatsat pulse for motion detection

IP.com Disclosure Number: IPCOM000234710D
Publication Date: 2014-Jan-30
Document File: 1 page(s) / 174K

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The IP.com Prior Art Database



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Data acquisition from REST slab or after a fatsat pulse for motion detection

At ISMRM13 two concepts were presented for motion detection, (a) FATNAVs in the brain, i.e. detecting the circumference of the brain by a fat selective excitation pulse, which excitation does not disturb the water signal (#0308, #0309), and (b) an NoseNav (#3757), where a thick slab readout is placed through the nose to detect its position for motion detection and compensation.

These presentations prompt me to propose adding a readout to existing sequence modules like regional presaturation (REST) or spectral fatsupression (FATSAT e.g. with SPIR or SPAIR). In current practice, no signals are acquired after these 'non-functional' RF pulses. Nevertheless, often significant time is available to allow the magnetization preparation to evolve to a desired (zero- signal) state at the time of the readout with the desired image contrast.

The proposed navigator acquisition methods add additional time-consuming sequence elements. Adding a readout (low resolution single shot EPI or spiral) after the REST or FATSAT RF pulses is more time-efficient, and if located appropriately, can be used for motion detection. The spare waiting time in the sequence after the 'non-functional' RF pulses is thereby efficiently used, while the magnetization evolution continues to be as required for the desired image contrast. A typical example of such a method is the application of a freely-angulated REST pulse to supp...