Yu, Shuang Automatic identification of needle insertion site in epidural anesthesia with a cascading classifier. [electronic resource] - Ultrasound in medicine & biology Sep 2014 - 1980-90 p. digital Publication Type: Journal Article ISSN: 1879-291X Standard No.: 10.1016/j.ultrasmedbio.2014.03.010 doi Subjects--Topical Terms: AdultAnesthesia, Epidural--instrumentationAnesthesia, Obstetrical--methodsEpidural Space--diagnostic imagingFemaleHumansImage Processing, Computer-Assisted--methodsLumbosacral Region--diagnostic imagingNeedlesPattern Recognition, Automated--methodsPregnancyReproducibility of ResultsUltrasonography, Interventional--methods