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The “M” in M‐mode stands for “motion.” This mode has also been called the “ice pick” mode because it reflects a small column of ultrasound waves but follows it over time. Cardiac ultrasound is where M‐mode is best known. It can be a little challenging to understand what is being displayed on the screen but using the B‐mode view to show just where that “ice pick” is cutting through is helpful. M‐mode is used not only for certain cardiac studies but also in certain lung and pleural space studies, vascular measurements for volume assessment, and fetal imaging. Importantly, M‐mode speed may be adjusted to slow, medium, and fast, and the M‐mode speed setting can significantly impact what you are attempting to interrogate, depending on the area of interest.