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4D-TRAK enables 60x faster 4D CE-MRA

White Paper
MRI NetForum Team Philips Healthcare Philips Global

The 4D-TRAK technique is a synergistic combination of two fast acquisition methods, SENSE and CENTRA keyhole.


SENSE (sensitivity encoding) is Philips' well-known parallel imaging technique that employs multiple RF coils and receivers and a special algorithm to enable acquisition speed increases. The SENSE factor used generally equals the scan time reduction factor, its maximum value depending on the geometry of the RF receive coil.


CENTRA, Contrast-Enhanced Timing Robust Angiography, is a k-space sampling strategy that optimizes CE-MRA image acquisition during arterial contrast. CENTRA scans the central, contrast-determining cylinder of k-space first, during the initial few seconds of arterial contrast. Following the arterial phase, acquisition of the peripheral k-space parts can be conducted to obtain the structural, high-resolution information.


The CENTRA keyhole method varies the acquisition by updating a small central k-space cylinder (e.g., 16% of k-space) at various times during the scan.The efficiency of scanning a fraction of k-space, as though looking through a keyhole, results in an automatic six-fold acceleration of dynamic MRA.


The combination of SENSE's speed (e.g. 8x faster) and the speed of keyhole (e.g. 6x faster) and halfscan (1.25x faster) can lead to an incredible speed-up of, in this case, 60x for 4D CE-MRA studies.



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Jun 26, 2006

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