I understand the noises are from the magnet doing its job, but why are there about 4 or 5 different sounds?
I’ve just came back from a brain MRI scan, and the first 10 minutes were one sound, later was another sound, then again another one. Why are they different?
In: 1
You need different so called gradients that are turned on and off which encode e.g. the exact location of the volume you are scanning (otherwise there would be no spatial resolution). The „rhythm“ depends on different time settings, which are required to identify which kind of tissue you will see in the image. as your whole brain is scanned in slices, the rhythm stays the same until the whole brain is images in this so called sequence. Then the settings are changed and a new sequence starts. For a brain scan you need at least 3-4 sequences usually, and it can take up to 12 in complicated cases.
You need different so called gradients that are turned on and off which encode e.g. the exact location of the volume you are scanning (otherwise there would be no spatial resolution). The „rhythm“ depends on different time settings, which are required to identify which kind of tissue you will see in the image. as your whole brain is scanned in slices, the rhythm stays the same until the whole brain is images in this so called sequence. Then the settings are changed and a new sequence starts. For a brain scan you need at least 3-4 sequences usually, and it can take up to 12 in complicated cases.
You need different so called gradients that are turned on and off which encode e.g. the exact location of the volume you are scanning (otherwise there would be no spatial resolution). The „rhythm“ depends on different time settings, which are required to identify which kind of tissue you will see in the image. as your whole brain is scanned in slices, the rhythm stays the same until the whole brain is images in this so called sequence. Then the settings are changed and a new sequence starts. For a brain scan you need at least 3-4 sequences usually, and it can take up to 12 in complicated cases.
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