RESUMEN
Objective:To evaluate the diagnostic efficiency of contrast-enhanced magnetic resonance angiography (CE-MRA), T 1WI and three-dimensional thin-layer T 1WI sequences (3D-T 1WI) in evaluating the blood supply of brain tumors, so as to improve the enhanced magnetic resonance imaging (MRI) scanning scheme of brain tumors. Methods:After the contrast agent was injected, 29 patients with brain tumors were scanned with CE-MRA, T 1WI and 3D-T 1WI. The imaging manifestations of " observing the enhancement of tumor substance" , " observing the small vessels in the tumor body" and " observing the small vessels around the tumor" were qualitatively classified, and the diagnostic differences of the three sequences were analyzed by McNemar test. Results:⑴ In the aspect of " observing the contrast medium in the tumor body" , CE-MRA, T 1WI and 3D-T 1WI sequences diagnosed as grade A1 were 0 cases, 8 cases (27.59%) and 19 cases (65.52%) respectively. The diagnostic efficiency of 3D-T 1WI sequences was better than that of T 1WI sequence ( P<0.05), and T 1WI sequence was better than that of CE-MRA sequence ( P<0.05). ⑵ In the aspect of " observing the small vessels in the tumor" , CE-MRA, T 1WI and 3D-T 1WI sequences diagnosed as grade B1 were 8 cases (27.59%), 5 cases (17.24%) and 16 cases (55.17%), respectively. The diagnostic efficiency of 3D-T 1WI was better than that of T 1WI and CE-MRA ( P<0.05). ⑶ In the aspect of " observing the small vessels around the tumor" , CE-MRA, T 1WI and 3D-T 1WI sequences diagnosed as grade C1 were 18 cases(62.07%), 5 cases (17.24%) and 14 cases (48.28%) respectively. The diagnostic efficiency of CE-MRA and 3D-T 1WI wre better than that of T 1WI ( P<0.05). Conclusions:The combination of 3D-T 1WI and CE-MRA sequence can comprehensively evaluate the blood supply of the tumor, which is of great significance for the localization, characterization and treatment of brain tumors.
