MRI and motion correction

Magnetic resonance imaging is sensitive to motion. Just like with other images, movement may cause blurring and distortion ('artefacts'). To counteract this, motion correction methods are often used. These include devices that track motion as well as software that can correct some of the artefacts after the images have been collected. We have just published … Continue reading MRI and motion correction

Advertisements

MRI and k-space

MRI images are created from raw data contained in a raw data space, called k-space. This is a matrix where MR signals are stored throughout the scan. K-space is considered a bit of a tricky topic, so I will only outline a brief explanation of what k-space is and how it relates to the MR image. This is a … Continue reading MRI and k-space

P-values for correlations in Excel

This is just a quick post to describe how to calculate p-values for two-variable correlations in Excel. Annoyingly, there is no direct way of doing this. Excel will give you the correlation, but not its associated p-value. It can be done, however, in a slightly roundabout way. First, calculate the correlation between your groups: =correl(variable1, variable2) … Continue reading P-values for correlations in Excel