If a 192 phase resolution is required, how many times must the TR be repeated for 1 NEX?

In MRI, phase resolution refers to the number of pixels in the phase encoding direction of the image, which directly impacts the resolution and detail captured in the final image. When a specific phase resolution is required, the number of repetitions of the TR (repetition time) needs to match the desired phase matrix size.

In this case, a phase resolution of 192 means that the image will consist of 192 pixels in the phase encoding direction. For each excitatory pulse, a certain number of TRs are needed to fill this resolution. Therefore, if you are acquiring data for 1 NEX (number of excitations), you must repeat the TR a total of 192 times to capture the necessary phase resolution.

This process ensures that the image is adequately sampled and that each pixel in the acquired data corresponds to the intended resolution. Consequently, the correct answer reflects the need to reproduce the TR for every pixel designated in the phase direction to achieve the desired detail in the final image.