A medical system (100, 300) comprising: - a memory storing machine executable instructions; - a computational system, wherein execution of the machine executable instructions causes the computational system to: - receive initial pulse sequence commands, wherein the initial pulse sequence commands are configured for controlling a magnetic resonance imaging system to acquire k-space data following a non-Cartesian k-space sampling pattern (604, 604'), wherein the initial pulse sequence commands are configured for controlling the magnetic resonance imaging system to sample the non-Cartesian k-space sampling pattern by repeatedly sampling a Cartesian k-space sampling pattern that is rotated for each acquisition, wherein the non-Cartesian k-space sampling pattern has an effective water-fat shift direction (606, 606') being representative for the direction in which the water-fat shift occurs; characterized in that execution of the machine executable instructions further causes the computational system to: - receive a chosen water-fat shift direction; and - construct modified pulse sequence commands by rotating the non-Cartesian k-space sampling pattern such that the effective water-fat shift direction is aligned with the water-fat shift direction. - a memory storing machine executable instructions; - a computational system, wherein execution of the machine executable instructions causes the computational system to: - receive initial pulse sequence commands, wherein the initial pulse sequence commands are configured for controlling a magnetic resonance imaging system to acquire k-space data following a non-Cartesian k-space sampling pattern (604, 604'), wherein the initial pulse sequence commands are configured for controlling the magnetic resonance imaging system to sample the non-Cartesian k-space sampling pattern by repeatedly sampling a Cartesian k-space sampling pattern that is rotated for each acquisition, wherein the non-Cartesian k-space sampling pattern has an effective water-fat shift direction (606, 606') being representative for the direction in which the water-fat shift occurs; characterized in that execution of the machine executable instructions further causes the computational system to: - receive a chosen water-fat shift direction; and - construct modified pulse sequence commands by rotating the non-Cartesian k-space sampling pattern such that the effective water-fat shift direction is aligned with the water-fat shift direction. - receive initial pulse sequence commands, wherein the initial pulse sequence commands are configured for controlling a magnetic resonance imaging system to acquire k-space data following a non-Cartesian k-space sampling pattern (604, 604'), wherein the initial pulse sequence commands are configured for controlling the magnetic resonance imaging system to sample the non-Cartesian k-space sampling pattern by repeatedly sampling a Cartesian k-space sampling pattern that is rotated for each acquisition, wherein the non-Cartesian k-space sampling pattern has an effective water-fat shift direction (606, 606') being representative for the direction in which the water-fat shift occurs; - receive a chosen water-fat shift direction; and - construct modified pulse sequence commands by rotating the non-Cartesian k-space sampling pattern such that the effective water-fat shift direction is aligned with the water-fat shift direction.