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[CT vs MRI in the diagnosis of acute stroke]
M Arias1, I Requena, I Pereiro
1Servicio de Neurología, Hospital Provincial de Santiago de Compostela.
Abstract:
70 patients who had suffered an acute stroke (52 ischaemic and 18 haemorrhagic) were studied with CT and MR, performing both techniques during the first week of disease and correlating the findings with the clinical data. MR proved superior in the detection of ischaemic infarcts, specially those in the posterior territory and with a small size; it was also superior to CT in the detection of leukoaraiosis and the demonstration of vascular obstructions. CT failed to detect a small brain stem haemorrhage secondary to bleeding of a cavernoma, while its performance was similar to that of MR in the remaining cases. In all patients with intracerebral haemorrhages, including two who were examined on the first day, an area of increased density was evidenced in the T1 sequences. It is concluded that CT, due to its greater availability and easiness of performance, must be maintained as first choice in acute stroke in order to differentiate haemorrhage from ischaemia, while MR may provide additional information in selected cases.
Insights
Computed tomography (CT) and magnetic resonance (MR) imaging were compared in 70 acute stroke patients. MR detected more ischemic infarcts and leukoaraiosis, but CT remains the first choice for differentiating stroke types due to availability.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Acute stroke diagnosis relies on differentiating ischemic from hemorrhagic events.
- Advanced imaging techniques like CT and MR play crucial roles in stroke assessment.
Purpose of the Study:
- To compare the efficacy of CT and MR imaging in detecting acute stroke pathologies.
- To evaluate the diagnostic performance of CT and MR in various stroke subtypes and locations.
Main Methods:
- Seventy patients with acute stroke (52 ischemic, 18 hemorrhagic) underwent both CT and MR imaging within the first week of symptom onset.
- Imaging findings were correlated with clinical data for diagnostic accuracy assessment.
Main Results:
- MR imaging demonstrated superior detection of ischemic infarcts, particularly in the posterior brain regions and smaller lesions.
- MR also showed higher sensitivity in identifying leukoaraiosis and vascular obstructions compared to CT.
- CT successfully identified most hemorrhages, though it missed a small brainstem hemorrhage from a cavernoma; T1 sequences in MR showed increased density in all hemorrhagic cases.
Conclusions:
- CT is recommended as the initial imaging modality for acute stroke due to its accessibility and ease of use in distinguishing hemorrhage from ischemia.
- MR imaging offers valuable supplementary information for specific stroke cases, enhancing diagnostic precision.