Reasons for patients not undergoing CT perfusion imaging
| Suspected renal dysfunction (ie, diabetic with unknown creatinine) | 48 (10%) |
| Known renal dysfunction (eGFR<50m l/min) | 36 (8%) |
| Obvious established stroke on non-contrast CT | 27 (6%) |
| Suspected posterior circulation stroke | 25 (5%) |
| Medically unstable/agitated | 16 (3%) |
| Known allergy to iodinated contrast | 0 |
| Clinician discretion | 47 (10%) |