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FreeWave architecture marks dawn of a new age in MR

White Paper
MRI NetForum Team Philips Healthcare Philips Global

 

Among all the improvements in the Philips MR platform over the last decade, the new FreeWave multi-channel spectrometer will have the most profound impact today and well into the future. With its 8- or 16-channel RF architecture - scalable up to 32 channels for future development - designed to support virtually limitless expansions, FreeWave provides the bandwidth to improve existing studies and set the stage for emerging applications.

 

FreeWave, the foundation of Philips' Achieva system, provides capabilities that extend far beyond data acquisition to the integrated, real-time control of RF transmission, gradient switching, triggering, coil switching, navigator feedback and pulse timing. Not only is FreeWave built around the Philips SENSE parallel imaging technique, but it will also enable higher SENSE factors and new ultra-fast imaging advances, such as k-t SENSE.

 PCA with SENSE factor 8. Image was acquired with the 8-channel SENSE Head coil.
PCA with SENSE factor 8.
Image was acquired with the 8-channel SENSE Head coil.
 THRIVE with SENSE factor 4, 150 slices of 2 mm, 1:42 min. Image was acquired with the 8-channel SENSE Knee coil.
THRIVE with SENSE factor 4, 150 slices of 2 mm, 1:42 min.
Image was acquired with the 8-channel SENSE Knee coil.

Direct digital sampling, new capabilities hallmarks of FreeWave

FreeWave features exceptional SNR by direct digital sampling of the MR signal - in contrast to standard data acquisition, which relies on signal-degrading analog filtering. With 3 MHz sampling bandwidth per RF channel, FreeWave also is three times more powerful than a conventional data acquisition system, yielding the industry-shortest TE (0.36 ms) and TR (0.9 ms). In fact, the FreeWave data acquisition system is the first with sub-ms TR. FreeWave also permits live feedback within a single TR, enabling instantaneous slice tracking.

 

The speed and capacity of FreeWave facilitate new, clinically useful capabilities. For example, MobiScan provides total body imaging in a single pass, with a virtually unlimited field-of-view and multiple contrast studies in a single scan.

 

Philips has maximized the multi-channel FreeWave architecture by introducing a variety of multi-channel RF coils, including 8-channel Head, 16-channel NeuroVascular, 12-channel Peripheral Vascular, and 8-channel Knee.

 T2-weighted TSE 3.0T, 1024 matrix, SENSE, 3:37 min. Courtesy of University of Modena, Italy.
T2-weighted TSE 3.0T, 1024 matrix, SENSE, 3:37 min. Courtesy of University of Modena, Italy.


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