Q. A 33-year-old-homeless man presented with a headache and a seizure episode that started 1 hour ago and lasted for 2 minutes. He has a history of focal segmental glomerulosclerosis diagnosed 2 months ago. His HR is 90/min, BP is 140/90 mmHg, RR is 20/min, and temperature is 37.3°C. elevated LDL and triglycerides are noted. On neurologic examination, There is bilateral papilloedema. Which of the following is the best imaging tool to make the diagnosis in this condition?