Compatible dual-echo arteriovenography (CODEA) using an echo-specific K-space reordering scheme.

Area of Science:

• Radiology
• Medical Imaging
• Neuroimaging

Background:

• Simultaneous MR angiography (MRA) and MR venography (MRV) are challenging due to conflicting optimal scan parameters.
• Previous methods struggled to reconcile these conflicting requirements for MRA and MRV acquisition.
• Optimal MRA and MRV image quality necessitates distinct excitation RF profiles, flip angles, and spatial presaturation pulses.

Purpose of the Study:

• To develop an improved dual-echo MRI sequence for simultaneous MRA and MRV acquisition at 3 Tesla.
• To overcome the limitations of previous methods in balancing conflicting scan parameters for MRA and MRV.
• To achieve high-quality vascular imaging in a single MR acquisition session.

Main Methods:

• Developed a dual-echo sequence with an echo-specific K-space reordering scheme.
• Uncoupled the distinct scan parameter requirements for MRA and MRV.
• Enhanced vascular contrast by maximizing separation of K-space center regions and using compatible scan parameters.

Main Results:

• Successfully acquired simultaneous dual-echo MRA and MRV with image quality comparable to conventional separate acquisitions.
• Demonstrated enhanced MRA and MRV vascular contrast.
• Achieved seamless vascular continuity over large brain anatomy coverage.

Conclusions:

• The improved dual-echo sequence effectively enables simultaneous MRA and MRV acquisition at 3 T.
• This technique overcomes previous limitations by reconciling conflicting scan parameter needs.
• The method offers comparable image quality to separate acquisitions and provides extensive brain vascular coverage.