目的:在使用基于钆的造影剂后,报告了钆在各种器官中的意外积累,在保持同等诊断性能的同时减少剂量。这项研究的目的是评估高弛豫率gadopiclenol与gadoterate葡甲胺相比在腹部对比增强磁共振血管造影(CE-MRA)中的对比增强性能。
方法:在健康兔子的第一项研究中,在4.7T时应用轴向3D梯度回波序列,以研究动脉增强与gadopiclenol剂量(0.025,0.05,0.075和0.1mmolGd/kg)或gadoterate葡甲胺(0.1mmolGd/kg)(n=5-6/组)的关系.测量并比较了第一次通过时主动脉中信噪比(ΔSNR)的增加。在第二个,6只健康猪的交叉研究,腹部CE-MRA序列在3T时与0.05mmolGd/kg的gadopiclenol或0.1mmolGd/kg的gadoterate葡甲胺间隔1周获得.定量地在最大强度投影(MIP)图像上,比较两组主动脉内的平均MIPSNR.定性,有经验的放射科医师对血管造影照片进行盲法比较,以确定首选造影剂.
结果:在兔子中,ΔSNR与格多美洛尔剂量呈线性相关(P=0.0010)。与gadoterate葡甲胺0.1mmolGd/kg相比,在0.05、0.075和0.1mmolGd/kg的加多昔诺(分别为+63%P=0.0731,+78%P=0.0081和+72%P=0.0773)之后,观察到了ΔSNR的增加,而在0.025mmolGd/kg时,ΔSNR与gadoterate葡甲胺0.1mmolGd/kg(+15%P>0.9999)的范围相同。在猪中,0.05mmol/kg加多昔诺后的对比增强比0.1mmolGd/kg加多酯葡甲胺后的MIPSNR高22%(P=0.3095)。定性,对gadopiclenol图像(3/6)优于gadoterate葡甲胺检查(1/6),其余的没有显示优先选项(2/6)。
结论:首过CE-MRA在0.05mmolGd/kg的剂量下使用gadopiclenol是可行的,其动脉信号增强和图像质量至少与0.1mmolGd/kg的gadoterate葡甲胺相同。
OBJECTIVE: Unexpected accumulations of gadolinium in various organs were reported after the administration of gadolinium-based contrast agents, making desirable to reduce the dose while maintaining equivalent diagnostic performance. The aim of this study was to evaluate the contrast enhancement performance of high relaxivity gadopiclenol compared with gadoterate
meglumine in abdominal contrast-enhanced magnetic resonance angiography (CE-MRA).
METHODS: In a first study in healthy rabbits, axial 3D gradient echo sequences were applied at 4.7 T to study arterial enhancement as a function of gadopiclenol dose (0.025, 0.05, 0.075, and 0.1 mmol Gd/kg) or gadoterate
meglumine at 0.1 mmol Gd/kg (n = 5-6/group). The increase in signal-to-noise ratio (ΔSNR) in the aorta at the first pass was measured and compared. In a second, crossover study in 6 healthy pigs, abdominal CE-MRA sequences were acquired at 3 T with gadopiclenol at 0.05 mmol Gd/kg or gadoterate
meglumine at 0.1 mmol Gd/kg at a 1-week interval. Quantitatively on the maximum intensity projection (MIP) images, the mean MIP SNR within the aorta of both groups was compared. Qualitatively, a blinded comparison of the angiograms was performed by an experienced radiologist to determine the preferred contrast agent.
RESULTS: In the rabbit, ∆SNR is linearly correlated with the gadopiclenol dose ( P = 0.0010). Compared with gadoterate
meglumine 0.1 mmol Gd/kg, an increase in the ∆SNR is observed after 0.05, 0.075, and 0.1 mmol Gd/kg of gadopiclenol (+63% P = 0.0731, +78% P = 0.0081, and +72% P = 0.0773, respectively), whereas at 0.025 mmol Gd/kg, ∆SNR is in the same range as with gadoterate
meglumine 0.1 mmol Gd/kg (+15% P > 0.9999). In pigs, contrast enhancement after gadopiclenol at 0.05 mmol/kg is +22% superior to MIP SNR after gadoterate meglumine at 0.1 mmol Gd/kg ( P = 0.3095). Qualitatively, a preference was shown for gadopiclenol images (3/6) over the gadoterate meglumine examinations (1/6), with no preference being shown for the remainder (2/6).
CONCLUSIONS: First-pass CE-MRA is feasible with gadopiclenol at 0.05 mmol Gd/kg with at least the same arterial signal enhancement and image quality as gadoterate meglumine at 0.1 mmol Gd/kg.