目的探讨三维稳态进动快速成像序列(3D fast imaging employing steady state acquisation,3D-FIESTA)及三维动态增强序列(3D fat-suppressed spoiled qradient-echo,3D-FSPGR)序列在颅神经血管压迫综合征的影像诊断中的作用。方法利用G...目的探讨三维稳态进动快速成像序列(3D fast imaging employing steady state acquisation,3D-FIESTA)及三维动态增强序列(3D fat-suppressed spoiled qradient-echo,3D-FSPGR)序列在颅神经血管压迫综合征的影像诊断中的作用。方法利用GE Signa HD MR 1.5T超导磁共振机,采用3D-FIESTA及3D-FSPGR序列,对17例临床怀疑有血管性神经压迫的患者行桥小脑角区扫描,采用多平面重建(MPR)及最小密度投影行后处理。结果3D-FIESTA显示13例,3D-FSPGR序列显示15例血管神经关系密切,其中三叉神经5例,面神经7例,副神经3例;有11例行微血管减压术,经手术证实。结论3D-FIESTA序列结合增强扫描3D-FSPGR序列能很好的显示血管性神经压迫,有助于准确影像诊断。展开更多
Objective：To introduce a new better contrast-enhanced MR angiographic metnod, named 3D time-resolved imaging of contrast kinetics （3D-TRICKS）. Methods： TRICKS is a high temporal resolution （2-6 s） MR angiographi...Objective：To introduce a new better contrast-enhanced MR angiographic metnod, named 3D time-resolved imaging of contrast kinetics （3D-TRICKS）. Methods： TRICKS is a high temporal resolution （2-6 s） MR angiographic technique using a short TR（4 ms） and TE（1.5 ms）, partial echo sampling, in which central part of k-space is updated more frequently than the peripheral part. TRICKS pre-contrast mask 3D images are firstly scanned, and then the bolus injecting of Gd-DTPA, 15-20 sequential 3D images are acquired. The reconstructed 3D images, subtraction of contrast 3D images with mask images, are conceptually similar to a catheter-based intra-arterial digital subtraction angiographic series （DSA）. Thirty patients underwent contrast-enhanced MR angiography using 3D-TRICKS. Results： Totally 12 vertebral arteries were well displayed on TRICKS, in which 7 were normal, 1 demonstrated bilateral vertebral artery stenosis, 4 had unilateral vertebral artery stenosis and 1 was accompanied with the same lateral carotid artery bifurcation stenosis. Four cases of bilateral renal arteries were normal, 1 transplanted kidney artery showed as normal and 1 transplanted kidney artery showed stenosis. 2 cerebral arteries were normal, 1 had sagittal sinus thrombosis and 1 displayed intracranial arteriovenous malformation. 3 pulmonary arteries were normal, 1 showed pulmonary artery thrombosis and 1 revealed pulmonary sequestration＇s abnormal feeding artery and draining vein. One left lower limb fibrolipoma showed feeding artery. One displayed radial-ulnar artery artificial fistula stenosis. One revealed left antebrachium hemangioma. Conclusion： TRICKS can clearly delineate most body vascular system and reveal most vascular abnormality. It possesses convenience and high successful rate, which make it the first choice of displaying most vascular abnormality.展开更多
目的研究1.5 T磁共振全身扩散加权成像(WB-DWI)及表观扩散系数(ADC)值在淋巴结病变中的诊断价值。方法淋巴结病变患者24例(病理证实者18例),其中恶性淋巴瘤者13例,良性淋巴类病变11例,于1.5 T HDX磁共振扫描仪行WB-DWI及全身分段冠状位F...目的研究1.5 T磁共振全身扩散加权成像(WB-DWI)及表观扩散系数(ADC)值在淋巴结病变中的诊断价值。方法淋巴结病变患者24例(病理证实者18例),其中恶性淋巴瘤者13例,良性淋巴类病变11例,于1.5 T HDX磁共振扫描仪行WB-DWI及全身分段冠状位FSEIR扫描,将DWI图像中颈部、腹膜后及腹股沟区淋巴结进行ADC值测量,并比较良性淋巴结及恶性淋巴结的平均ADC值。结果 DWI与FSEIR序列比较,DWI显示淋巴结的总数多于后者。13例淋巴瘤患者治疗前平均ADC值为(0.924±0.516)×10-3mm2/s,其中4例治疗前、后平均ADC值分别为(0.666±0.127)×10-3mm2/s、(1.685±0.349)×10-3mm2/s,治疗前后ADC值比较有统计学差异(P<0.01),11例良性淋巴结的平均ADC值为(1.735±0.313)×10-3mm2/s,与13例淋巴瘤治疗前ADC值比较有统计学差异(P<0.01)。2例病理类型为胃体黏膜相关性淋巴瘤ADC值为(1.845±0.395)×10-3mm2/s,与11例良性淋巴结病变的平均ADC值比较无统计学差异(P=0.329)。结论 1.5 T磁共振WB-DWI扫描及ADC值测量为淋巴结病变的检出及定性诊断提供了有力证据,并且可作为淋巴瘤治疗后疗效评价的有效指标。展开更多
文摘目的探讨三维稳态进动快速成像序列(3D fast imaging employing steady state acquisation,3D-FIESTA)及三维动态增强序列(3D fat-suppressed spoiled qradient-echo,3D-FSPGR)序列在颅神经血管压迫综合征的影像诊断中的作用。方法利用GE Signa HD MR 1.5T超导磁共振机,采用3D-FIESTA及3D-FSPGR序列,对17例临床怀疑有血管性神经压迫的患者行桥小脑角区扫描,采用多平面重建(MPR)及最小密度投影行后处理。结果3D-FIESTA显示13例,3D-FSPGR序列显示15例血管神经关系密切,其中三叉神经5例,面神经7例,副神经3例;有11例行微血管减压术,经手术证实。结论3D-FIESTA序列结合增强扫描3D-FSPGR序列能很好的显示血管性神经压迫,有助于准确影像诊断。
文摘Objective：To introduce a new better contrast-enhanced MR angiographic metnod, named 3D time-resolved imaging of contrast kinetics （3D-TRICKS）. Methods： TRICKS is a high temporal resolution （2-6 s） MR angiographic technique using a short TR（4 ms） and TE（1.5 ms）, partial echo sampling, in which central part of k-space is updated more frequently than the peripheral part. TRICKS pre-contrast mask 3D images are firstly scanned, and then the bolus injecting of Gd-DTPA, 15-20 sequential 3D images are acquired. The reconstructed 3D images, subtraction of contrast 3D images with mask images, are conceptually similar to a catheter-based intra-arterial digital subtraction angiographic series （DSA）. Thirty patients underwent contrast-enhanced MR angiography using 3D-TRICKS. Results： Totally 12 vertebral arteries were well displayed on TRICKS, in which 7 were normal, 1 demonstrated bilateral vertebral artery stenosis, 4 had unilateral vertebral artery stenosis and 1 was accompanied with the same lateral carotid artery bifurcation stenosis. Four cases of bilateral renal arteries were normal, 1 transplanted kidney artery showed as normal and 1 transplanted kidney artery showed stenosis. 2 cerebral arteries were normal, 1 had sagittal sinus thrombosis and 1 displayed intracranial arteriovenous malformation. 3 pulmonary arteries were normal, 1 showed pulmonary artery thrombosis and 1 revealed pulmonary sequestration＇s abnormal feeding artery and draining vein. One left lower limb fibrolipoma showed feeding artery. One displayed radial-ulnar artery artificial fistula stenosis. One revealed left antebrachium hemangioma. Conclusion： TRICKS can clearly delineate most body vascular system and reveal most vascular abnormality. It possesses convenience and high successful rate, which make it the first choice of displaying most vascular abnormality.
