The process that digitizes the MR signals is known as:

The process that digitizes the MR signals is known as the Fourier transform. In Magnetic Resonance Imaging, the signals produced by the alignment of hydrogen protons in a magnetic field need to be converted from the time domain (the raw MR signals) to the frequency domain (the image data that can be processed into useful visual information). The Fourier transform is a mathematical algorithm that performs this conversion, allowing for the analysis of various frequency components of the signals.

Through the application of the Fourier transform, it is possible to reconstruct images from the complex data received, enabling clinicians to visualize anatomy and pathology effectively. This mathematical technique is fundamental in MRI technology, making it an essential concept for those preparing for the ARRT Magnetic Resonance Imaging Registry.

Other choices, while relevant to different aspects of MRI or physics, do not pertain to the specific process of digitizing the MR signals. For instance, Hahn's echo relates to a specific sequence used in MRI imaging; gyromagnetic reconstruction involves principles of magnetism rather than signal processing; and the Moire effect pertains to interference patterns caused by the superimposition of two grids, rather than an imaging technique in MRI.