*May help determine the qualitative cerebral blood flow volume to the area surrounding the infarct tissue and can determine the risk of future infarct. <ref name="pmid19797189">{{cite journal| author=Latchaw RE, Alberts MJ, Lev MH, Connors JJ, Harbaugh RE, Higashida RT et al.| title=Recommendations for imaging of acute ischemic stroke: a scientific statement from the American Heart Association. | journal=Stroke | year= 2009 | volume= 40 | issue= 11 | pages= 3646-78 | pmid=19797189 | doi=10.1161/STROKEAHA.108.192616 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19797189 }} </ref><ref name="pmid9194426">{{cite journal| author=Shrier DA, Tanaka H, Numaguchi Y, Konno S, Patel U, Shibata D| title=CT angiography in the evaluation of acute stroke. | journal=AJNR Am J Neuroradiol | year= 1997 | volume= 18 | issue= 6 | pages= 1011-20 | pmid=9194426 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=9194426 }} </ref><ref name="pmid11779922">{{cite journal| author=Verro P, Tanenbaum LN, Borden NM, Sen S, Eshkar N| title=CT angiography in acute ischemic stroke: preliminary results. | journal=Stroke | year= 2002 | volume= 33 | issue= 1 | pages= 276-8 | pmid=11779922 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11779922 }} </ref>
*May help diagnose basilar artery thrombosis and acute large intracranial thrombosis
===MR angiography===
*May help diagnose basilar artery thrombosis and large intracranial thrombosis.<ref name="pmid23907247">{{cite journal| author=Wintermark M, Sanelli PC, Albers GW, Bello J, Derdeyn C, Hetts SW et al.| title=Imaging recommendations for acute stroke and transient ischemic attack patients: A joint statement by the American Society of Neuroradiology, the American College of Radiology, and the Society of NeuroInterventional Surgery. | journal=AJNR Am J Neuroradiol | year= 2013 | volume= 34 | issue= 11 | pages= E117-27 | pmid=23907247 | doi=10.3174/ajnr.A3690 | pmc=4072500 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23907247 }} </ref><ref name="pmid16934921">{{cite journal| author=Verro P, Tanenbaum LN, Borden N, Eshkar N, Sen S| title=Clinical application of CT angiography in acute ischemic stroke. | journal=Clin Neurol Neurosurg | year= 2007 | volume= 109 | issue= 2 | pages= 138-45 | pmid=16934921 | doi=10.1016/j.clineuro.2006.07.002 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16934921 }} </ref>
===SPECT scan===
===Digital subtraction angiography===
*May help diagnose collateral flow in cases of ischemic stroke.<ref name="pmid23907247">{{cite journal| author=Wintermark M, Sanelli PC, Albers GW, Bello J, Derdeyn C, Hetts SW et al.| title=Imaging recommendations for acute stroke and transient ischemic attack patients: A joint statement by the American Society of Neuroradiology, the American College of Radiology, and the Society of NeuroInterventional Surgery. | journal=AJNR Am J Neuroradiol | year= 2013 | volume= 34 | issue= 11 | pages= E117-27 | pmid=23907247 | doi=10.3174/ajnr.A3690 | pmc=4072500 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23907247 }} </ref><ref name="pmid25807127">{{cite journal| author=Lange MC, Bruch TP, Pedrozo JC, Maranha L, Sakae TM, Pacheco R et al.| title=The use of neurovascular ultrasound versus digital subtraction angiography in acute ischemic stroke. | journal=Arq Neuropsiquiatr | year= 2015 | volume= 73 | issue= 3 | pages= 218-22 | pmid=25807127 | doi=10.1590/0004-282X20140231 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=25807127 }} </ref>
*May be beneficial in diiagnosis of basilar artery thrombosis.
===Positron emission tomography===
*Irreversible tissue damage and pneumbra <ref name="pmid18854664">{{cite journal| author=Heiss WD, Sobesky J| title=Comparison of PET and DW/PW-MRI in acute ischemic stroke. | journal=Keio J Med | year= 2008 | volume= 57 | issue= 3 | pages= 125-31 | pmid=18854664 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=18854664 }} </ref>
===Arterial spin labelling===
*May help diagnose the presence of collateral blood flow
When a stroke has been diagnosed, various other studies may be performed to determine the underlying etiology. With the current treatment and diagnosis options available, it is of particular importance to determine whether there is a peripheral source of emboli. Test selection may vary, since the cause of stroke varies with age, comorbidity and the clinical presentation. An angiogram of the cerebral vasculature (if a bleed is thought to have originated from an aneurysm or arteriovenous malformation)
Other Imaging Studies
Other imaging studies which may help diagnose the cause and risk factors of ischemic stroke may include:[1]