In this work we present phantom and in-vivo pTx excitation results acquired with a 32-channel add-on pTx system based on a 1-channel 7T MRI system. The add-on system uses custom-built I/Q modulators and custom-built amplifiers located inside the magnet room. The single exciter channel is split into 32 sub-channels, whereby the modulators control the phase and amplitude of the individual pTx RF pulses. The modulators and pre-calculated pTx gradients are synchronized via trigger signals generated in the imaging sequence. With the 32-channel pTx system, reduced FOV imaging of the lumbar vertebrae during free breathing was possible.
How to access this content:
For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.
After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.
After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.
Keywords