ARMRIT Registry Practice Exam 2025 - Free Practice Questions and Study Guide for ARMRIT Certification

When the phase matrix is increased, the amount of data collected during an MRI scan also increases, which leads to a longer scan time. The phase matrix refers to the number of phase-encoding steps in the acquisition of the image. With a higher phase matrix, the system must sample more points in the frequency-encoding space to achieve increased spatial resolution. This involves additional time to obtain the required signal samples, resulting in an increase in the overall scan time.

By contrast, a lower phase matrix results in fewer phase-encoding steps, which can reduce scan time but at the potential cost of image resolution and detail. Therefore, as the phase matrix increases, it is essential to anticipate a corresponding increase in scan time to accommodate the additional data collection needed for the higher resolution images.