Article Figures & Data
Figures
- FIG 1.
The most common use of an iodinated contrast agent in CT imaging (CT PA indicates CT pulmonary angiography).
- FIG 2.
MR imaging/CT decision tree for Code Stroke. ASAP indicates as soon as possible.
- FIG 3.
Acute fast Code Stroke MR imaging. A 51-year-old woman with new left-sided weakness, last seen well 12 hours earlier. Abbreviated MR imaging protocol with fast DWI, PWI, SWI, TOF-MRA, and T1 neck was performed. A, DWI shows small foci of cortical restricted diffusion in the right frontal lobe in the MCA and anterior cerebral artery territories. B, The Tmax map shows severe delay in the distribution of the right MCA M3 and anterior cerebral artery A4 branches. C, TOF-MRA MIP shows no large-vessel occlusion. An M3 occlusion is evident on source images.
- FIG 4.
Sample of 40-mL CTP/CTA obtained on a Toshiba 320 scanner. Images from a 79-year-old woman who presented with sudden-onset expressive dysphasia. A, MIP CTA images reconstructed from the CTP acquisition at peak arterial opacification demonstrate good opacification of medium and distal intracranial arteries. Proximal occlusion of the left MCA inferior to the M2 division (arrow) is evident. B and D, Selected slices of Tmax and relative CBF maps show marked territorial Tmax delay and reduced rCBF. The subarachnoid space over the right frontal lobe is focally dilated. C, CTP, relative CBF, and Tmax mismatch maps show that there is some salvageable penumbra. Diagnostic-quality CTP was maintained despite contrast dose reduction.
- FIG 5.
Examples of 20-mL CTA performed on small-detector-width CT (Discovery 750; GE Healthcare). A, Axial CTA MIP demonstrates occlusion of the inferior M2 division of the right MCA (arrow) in a 75-year-old man with sudden-onset abnormal left-sided movements. B and C, A single section of Tmax and rCBF maps shows territorial Tmax delay and a small area of severely reduced relative CBF. D, Sample of an axial CTA MIP in a different patient, a 71-year-old woman with right-sided weakness. The patient had a low weight (50 kg), accounting for the superior arterial opacification with the same contrast load. E and F, Selected Tmax and relative CBF images show that the CTP quality is excellent.
