期刊文献+

EZ-Step技术在胸主动脉3.0T磁共振血管造影中的应用 被引量:1

Scoutless EZ-Step in contrast-enhanced magnetic resonance angiography of thoracic aorta at 3.0T MR
下载PDF
导出
摘要 目的评估EZ-Step技术在胸主动脉对比增强磁共振血管造影(CEMRA)中的应用价值。方法60例临床怀疑胸主动脉疾病的患者,随机接受胸主动脉常规CEMRA或应用EZ-Step技术的CEMRA检查,后者扫描过程中应用<0.1ms非选择性激励射频脉冲代替常规选择性激励射频脉冲;除视野外,其余各项MR扫描参数及对比剂用量均尽量保持一致。比较胸主动脉常规CEMRA及应用EZ-Step的CEMRA二种技术总的扫描时间、图像质量评分以及图像信噪比等。结果应用EZ-Step技术后,MRA检查时间显著缩短,与常规CEMRA图像质量无明显差异(分别为2.48±0.50和2.66±0.56,P>0.05);图像信噪比轻度下降(P<0.05),但诊断准确性未受影响。结论在进行胸主动脉MRA时,使用EZ-Step技术可以缩短扫描时间,获得良好的图像质量,是利用3.0TMR诊断急性主动脉疾病有效而省时的方法。 Objective To evaluate the scoutless technique, termed as EZ-Step, in contrast-enhanced magnetic resonance angiography (CE-MRA) compared with conventional three dimensional CE MRA of thoracic aorta at 3.0T MR system. Methods Sixty consecutive patients were divided into two groups randomly and underwent the thoracic aorta MRA with scoutless EZ-Step and conventional CE-MRA, respectively, on GE Signa Exite HD 3.0T scanner. For EZ-Step group, the standard selective RF excitation (typically about 1--2 ms in duration) was replaced by short, spatial nonselective RF pulse with a duration less than 0.1 ms. Whole volume excitation was achieved by applying the RF pulse without a slice-selection gradient. Except for field of view, other parameters and contrast agents were similar in two groups. The total scan time of MRA was recorded. The image quality was estimated by two radiologists independently according to the score grading system. The SNR was calculated and compared between the two groups. Results The average scan time for EZ-Step was less than that of conventional CE-MRA. No statistical difference of image quality score was found between the two groups (2.48±0.50 vs 2.66±0.56, P〉0.05), while SNR slightly decreased in EZ-Step group than conventional group (P〈0.05). No misdiagnosis occurred in both groups. Conclusion In thoracic aorta MRA, the scoutless EZ Step technique may reduce scan time obviously and provide comparable image quality at 3.0T MR system, and it can be used as an effective and time-saving method at 3.0T for acute aortic diseases.
出处 《中国医学影像技术》 CSCD 北大核心 2009年第8期1508-1511,共4页 Chinese Journal of Medical Imaging Technology
关键词 磁共振血管成像 主动脉疾病 非选择性射频激励脉冲 图像质量 Magnetic resonance angiography Aorta diseases Non-selective radiofrequency excitation Image quality
  • 相关文献

参考文献9

二级参考文献30

  • 1罗健君,李晓兵,许建铭,须同禄,刘仁坚,秦明明,汤建英.磁共振对比增强血管三维成像技术的方法探讨[J].中国医学影像技术,2004,20(6):891-893. 被引量:17
  • 2安宁豫.三维增强磁共振血管造影技术和临床应用[J].中国医学影像学杂志,2004,12(6):448-451. 被引量:9
  • 3刘崎,陆建平,田建明,王飞,王莉,金爱国,曾浩,龚建国.腹主动脉瘤三维增强MR血管造影的临床价值[J].中华放射学杂志,2004,38(10):1102-1107. 被引量:24
  • 4刘玉清 张立仁 等.主动脉疾患磁共振成像诊断(10例初步分析)[J].中华放射学杂志,1988,22(5):265-267.
  • 5[1]Lee VS, Martin DJ, Krinsky GA, et al. Gadiolinium-enhanced MR angiograhpy; artifacets and piffalls [J]. AJR, 2000, 175 ( 1 ):197-205.
  • 6[4]Poon E, Yucel EK, Pagan-Marin H, et al. Lliac artery stenosis measurements:comparison of two-flight and three-dimensional dynamic gadolinium enhanced MR angiography [J]. AJR, 1997, 169(4): 1139-1144.
  • 7[5]Foo TK, Saranathan M, Prince MR, et al. Automatic detection of bolus arrival time and initiation of data acquisition in fast, three-dimensional gadolinium-enhanced, MR angiography [J]. Radiology,1997,203(1) :275-280.
  • 8[7]Kopka L,.Vosshenrich R, Rodenwaldt J, et al. Differences in injection rate on contrast-enhanced breath-hold three-dimensional MR angiography[J]. AJR, 1998,170(4):345-348.
  • 9Martin RP, Thomas MG, Jorg FD, et al. 3D Contrast MR Angiography[M]. 2nd ed. New York: Springer, Berlin, Heidelberg,1999.
  • 10Godart F, Labrot G, Devos P,comparison of aortic dimensionset al. Coarctation of the aortabetween conventional MR imaging, 3D MR angiography, and conventional angiography[J]. Eur Radiol, 2002, 12(8) :2034-2039.

共引文献32

同被引文献5

引证文献1

二级引证文献1

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部