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Abstract #3351

Ellipsoidal Cartesian K-space Sampling with Variable Readout Duration for 3D MRI Acceleration

Haotian Hong1, Zijian Zhou1, and Peng Hu1,2,3
1School of Biomedical Engineering, ShanghaiTech University, Shanghai, China, 2State Key Laboratory of Advanced Medical Materials and Devices, Shanghai, China, 3Shanghai Clinical Research and Trial Center, Shanghai, China

Synopsis

Keywords: Pulse Sequence Design, Pulse Sequence Design

Motivation: Conventional Cartesian MRI acceleration techniques subsample the K-space in the phase encoding direction, but rarely in the readout direction.

Goal(s): To develop a new technique that accelerates Cartesian MRI acquisition by subsampling K-space in the readout direction.

Approach: The ellipsoidal K-space sampling with variable readout duration was proposed. T1-weighted and time-of-flight (TOF) MR angiography images were acquired with the proposed method and compared with conventional cylindrical sampling.

Results: The proposed method reduces scan time while maintaining image quality. The acceleration ratio was 23.4% for T1-weighted, and 6% for TOF.

Impact: Ellipsoidal sampling strikes a balance between efficiency and simplicity. It is compatible with other acceleration methods that subsample the phase encodings and provides a new insight for acceleration along the readout direction.

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