A male infant is delivered at 29 weeks of gestation via emergency cesarean section due to severe preeclampsia in the mother. The birth weight is 1200 grams, and Apgar scores are 6 at 1 minute and 8 at 5 minutes. The infant is admitted to the neonatal intensive care unit (NICU) for respiratory support and further monitoring. On day 3 of life, the infant develops episodes of apnea and bradycardia. Physical examination reveals a tense fontanelle, and the infant appears lethargic. No seizures are observed. You become concerned about potential neurological complications such as intraventricular hemorrhage. Which diagnostic tool is most commonly used to detect intraventricular hemorrhage in preterm infants?
