Table 1.

Classification of pseudocontinuous ASL artefacts.

Arising during labeling	Arising during transit	Arising during read-out/image acquisition
Ineffective labelling	Loss of spin label	Motion-related artefact
CSF labelling	Intra-arterial ASL artefact• Arterial transit artefact• Border zone artefact• Trapped ASL signal	Blurring
		Occipital lobe hyperperfusion
	Venous ASL signal

CSF: cerebrospinal fluid; ASL: arterial spin labelling.

Modified from Amukotuwa et al.13