Prince M R, Narasimham D L, Stanley J C, Chenevert T L, Williams D M, Marx M V, Cho K J
Department of Radiology, University of Michigan, Ann Arbor 48109-0030, USA.
Radiology. 1995 Dec;197(3):785-92. doi: 10.1148/radiology.197.3.7480757.
To develop and evaluate a sequence for breath-hold three-dimensional gadolinium-enhanced magnetic resonance (MR) angiography of the abdominal aorta.
In 63 patients, the abdominal aorta and its branches were imaged for 29, 43, or 58 seconds with breath holding. A fast spoiled gradient-echo sequence was used at 1.5 T during infusion of 42 mL of a gadolinium chelate. Correlation with conventional angiography was performed in 19 patients. MR image quality (signal-to-"total" noise ratio [S/N*]) with breath holding was compared with that with free breathing (104 patients).
With breath-hold gadolinium-enhanced MR angiography, renal, celiac, and superior mesenteric artery occlusive disease was graded appropriately in 15 of 19 patients, and 10 of 11 accessory renal arteries were depicted correctly. Renal artery branches were visualized in 86 of 95 kidneys on breath-hold images compared with only 84 of 236 kidneys with free breathing (P < .001). Distal renal artery S/N* was 3.1 with breath holding and 2.1 with free breathing (P < .001).
Breath holding statistically significantly improves three-dimensional gadolinium-enhanced MR angiography of the renal, celiac, and superior mesenteric arteries.
开发并评估一种用于腹主动脉屏气三维钆增强磁共振（MR）血管造影的序列。
对63例患者进行成像，在屏气状态下对腹主动脉及其分支成像29、43或58秒。在注入42 mL钆螯合物的过程中，于1.5 T使用快速扰相梯度回波序列。对19例患者进行了与传统血管造影的相关性研究。将屏气时的MR图像质量（信号与“总”噪声比[S/N*]）与自由呼吸时的图像质量进行比较（104例患者）。
采用屏气钆增强MR血管造影，19例患者中有15例对肾动脉、腹腔干和肠系膜上动脉闭塞性疾病进行了恰当分级，11支副肾动脉中有10支被正确显示。屏气图像上95个肾脏中的86个显示出肾动脉分支，而自由呼吸时236个肾脏中只有84个显示出肾动脉分支（P <.001）。屏气时肾动脉远端的S/N*为3.1，自由呼吸时为2.1（P <.001）。
屏气在统计学上显著改善了肾动脉、腹腔干和肠系膜上动脉的三维钆增强MR血管造影。
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