Fig. 1

Flowchart of study population selection. SFMU, Shandong First Medical University; MCA, middle cerebral artery; ONS, optic nerve sheath; TCCD, transcranial color Doppler; IH, intracranial hypertension; TBI, traumatic brain injury; ICA, internal carotid artery; post-DC, postoperative decompressive craniectomy; ICP, intracranial pressure.