Preprocessing - happens after image reconstruction but before statistical analysis , Check with the naked eye - software is a black box, check before and after pre processing, sample artifacts - ghosting, hardware malfunctions, metallic objects, spikes, Hardware malfunctions - cause stripes in the images, metallic objects - distort the image around the objects, physical noise - is caused by the hardware malfunction or wrong settings, physiological noise - is caused by the subject , To tell physical vs physiological noise apart - you can test a phantom- inanimate object everyday in the MRI system which cannot produce physiological noise,

Data quality and preprocessing

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