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TABLE 2: Imaging findings in patients with and without hemorrhagic transformation after IA reperfusion therapy
Hemorrhagic Transformation No Hemorrhagic Transformation P Value
CTA-SI (prospective segmentation) 
Total lesion volume (ml) 51.5 30.8 .20
Single slice lesion volume on slice containing core (ml) 2.5 2.0 .46
Core lesion volume (ml) 0.24 0.32 .06
Single slice lesion mean ΔHU (HU) (normal tissue HU − single slice lesion HU on single slice containing core) 3.6 3.2 .63
Core Mean ΔHU (HU) (normal tissue HU − core lesion HU) 9.0 6.3 .006
Unenhanced CT (post hoc segmentation) 
Single slice lesion mean ΔHU (normal tissue HU − single slice lesion HU on single slice containing core) (HU) 5.8 3.3 .02
Note.—CT indicates computed tomography; CTA-SI, computed tomography angiography source images; ΔHU, Hounsfield units.

	Hemorrhagic Transformation	No Hemorrhagic Transformation	P Value
CTA-SI (prospective segmentation)
Total lesion volume (ml)	51.5	30.8	.20
Single slice lesion volume on slice containing core (ml)	2.5	2.0	.46
Core lesion volume (ml)	0.24	0.32	.06
Single slice lesion mean ΔHU (HU) (normal tissue HU − single slice lesion HU on single slice containing core)	3.6	3.2	.63
Core Mean ΔHU (HU) (normal tissue HU − core lesion HU)	9.0	6.3	.006
Unenhanced CT (post hoc segmentation)
Single slice lesion mean ΔHU (normal tissue HU − single slice lesion HU on single slice containing core) (HU)	5.8	3.3	.02