Algorithm 1: System execution procedure.

Result: Spliced k-space data with enhanced SNR Input: Init: Start GRE sequence scanning and configure the RG parameters as τ, τ − 6, and τ − 12 dB; Step 1: Obtain 3 sets of k-space data: Kτ obtained under RG = τ, Kτ−6 obtained under RG = τ − 6, Kτ−12 obtained under RG = τ − 12; Step 2: Correct the gain difference and phase difference for Kτ and Kτ−6, Correct the gain difference and phase difference for Kτ−6 and Kτ−12, Calculate the gain difference and phase difference for Kτ and Kτ−12; Step 3: Extract Kτ1, Kτ−62, and Kτ−123 from Kτ, Kτ−6, and Kτ−12, respectively to obtain a set of spliced k-space data. Step 4: Compensate for the gain difference between Kτ1, Kτ−62, and Kτ−123; Step 5: Obtain image data by Fourier transform of the spliced k-space data. Output: SNR of the image obtained by Fourier transform of the spliced k-space data