Hubungan Nilai Apparent Diffusion Coefficient Dengan Derajat Edema Peritumoral Glioblastoma Pada Pemeriksaan Magnetic Resonance Imaging Kepala Serta Faktor-Faktor Yang Memengaruhinya Di RSUPN Dr. Cipto Mangunkusumo = Relationship Between Apparent Diffusion Coefficient and Degree of Peritumoral Edema in Glioblastoma on Head Magnetic Resonance Imaging Examination and Its Influencing Factors at RSUPN Dr. Cipto Mangunkusumo