Phase and Frequency Matrix - Video Lesson

Hey, everybody. Welcome to today's lesson on spatial encoding in MRI. This lesson focuses on the phase matrix and the frequency matrix and their relationships with resolution. By the end of this lesson, you should be able to define key terms related to MRI image formation and understand how different gradients affect pixel size. The phase matrix in an MRI refers to the number of times the phase encoding gradient is changed during a pulse sequence. Each phase encoding step corresponds to a specific row of data inside of k space. In turn, when k space goes through the fast Fourier transform, the phase matrix will determine the number of pixels in the phase direction of the image. The technologist will select the phase matrix at the beginning of each pulse sequence. The phase matrix determines the resolution and phase direction of the MRI image.