Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty of Mannheim, University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
Eur J Radiol. 2011 Nov;80(2):537-42. doi: 10.1016/j.ejrad.2011.01.019. Epub 2011 Feb 4.
To investigate the potential of continuous table movement (CTM)-MRA for reduction of acquisition time and to evaluate the image quality in comparison to conventional stepping table (CST) MRA.
The data of 82 patients were included in this retrospective, IRB-approved study. All patients underwent peripheral MRA at our institution. 41 consecutive patients were examined with a CST-MRA at a 1.5 T MR system. 41 different consecutive patients were examined with a CTM-MRA at 3.0 T MR system. Image quality was assessed by two independent radiologists in consensus on a 4-point Likert-type scale. Descriptive statistics and t-tests were used to compare image acquisition time of CST-MRA to that of CTM-MRA with and without additional time-resolved imaging of the feet using the TWIST technique. Additionally, acquisition time was compared in a subgroup of the fastest 50%.
The mean imaging time for the CTM-MRA was 34% less than with the CST-MRA (18.2 min vs. 27.5 min; p<0.0001). Even with inclusion of the TWIST sequence the combined CTM-/TWIST-MRA protocol was 26% faster (20.3 min vs. 27.5 min; p<0.0001). The image quality was slightly better with CTM-MRA (CTM-MRA mean score 3.3±0.5, mean score CST-MRA 2.9±0.6). Venous overlay was significantly lower using the CTM-MRA approach (CTM-MRA mean score 2.8±0.4; CST-MRA mean score 2.2±0.7; p<0.0001).
CTM-MRA is on average 30% faster than a comparable CST-MRA protocol with equal image quality. Even when adding an additional time-resolved-MRA of the calf station the CTM-MRA protocol is still 26% faster. In conclusion, this study proves that CTM-MRA further improves MRA by reducing user interference and image acquisition times and hence allowing to increase the clinical throughput.
研究连续床面移动（CTM）-MRA 技术在减少采集时间方面的潜力，并与传统步进床面（CST）MRA 进行比较，评估其图像质量。
本回顾性研究经机构审查委员会批准，共纳入 82 例患者。所有患者均在我院行外周 MRA 检查。41 例连续患者在 1.5T MR 系统上行 CST-MRA 检查，41 例连续患者在 3.0T MR 系统上行 CTM-MRA 检查。两位独立的放射科医生采用 4 分 Likert 量表对图像质量进行评估。采用描述性统计和 t 检验比较 CST-MRA 和 CTM-MRA 的图像采集时间，并使用 TWIST 技术对足部进行额外的时间分辨成像。此外，在最快的 50%的亚组中比较采集时间。
CTM-MRA 的平均成像时间比 CST-MRA 缩短 34%（18.2min 比 27.5min；p<0.0001）。即使加入 TWIST 序列，联合 CTM-/TWIST-MRA 方案也快 26%（20.3min 比 27.5min；p<0.0001）。CTM-MRA 的图像质量略好（CTM-MRA 平均评分为 3.3±0.5，CST-MRA 平均评分为 2.9±0.6）。静脉重叠使用 CTM-MRA 技术明显降低（CTM-MRA 平均评分为 2.8±0.4；CST-MRA 平均评分为 2.2±0.7；p<0.0001）。
CTM-MRA 平均比具有可比性的 CST-MRA 方案快 30%，图像质量相同。即使加入额外的小腿段时间分辨 MRA，CTM-MRA 方案仍快 26%。总之，本研究证明 CTM-MRA 通过减少用户干扰和图像采集时间进一步改善了 MRA，从而提高了临床吞吐量。
