The aetiology of transient cerebral ischaemia is complex. For these reasons the development of non-invasive techniques that can detect lesions in the vessels supplying the affected cerebral hemisphere has been pursued. These include ophthalmodynamometry (Liversedge and Smith, 1961), thermography (Wood, 1965), carotid phonoangiography (Duncan et al., 1975), ocular plethysmography (Gee et al., 1974), and radioisotope cerebral perfusion (Weissman et al., 1975).
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