A Serial Studies On Technique And Clinical Application Of Three-dimensional Dynamic Contrast-enhanced MR Angiography

Part one: the study on technique about 3-D DCE MRAPurposes: to optimize the imaging technique and parameters of 3-D DCE MRA and emphasize on breath-holding, different injected doses and imaging matrix. Materials and methods:3-D DCE MRA was performed in 68 cases with suspected aortic diseases including 48 males and 20 females, and age ranged 18-71 years with a mean of 50. 3. The two subgroup including six cases of thoracic aorta(branchiocephic artery)and six cases of abdominal aorta (renal artery) per subgroup were examined by 3-D DCE MRA with breath-holding and without breath-holding respectively, and the other three subgroup including six cases of thoracic aorta(branchiocephic artery)and six cases of abdominal aorta(renal artery) per subgroup were performed using three different injected doses:0. 1, 0. 2, and 0. 3mmol/kg of body weight Gd-DTPA. The each ten cases of thoriac aorta (branchicephic artery) were studied with different matrix (96 x 256 and 128 x 256). The other parameters including TR/TE 9/3.0 ms, flip angle 30° and injected rate 2ml/s were used in subgroups. All 3-D DCE MRA images were subsequently post- processed using three-dimensional maximum intensity projection (MIP). Quantitative signal-to-noise ratio...