Gadolinium-enhanced multiphasic 3D MRI of the liver with prospective adaptive navigator correction: Phantom study and preliminary clinical evaluation
Gadolinium-enhanced multiphasic 3D MRI of the liver with prospective adaptive navigator correction: Phantom study and preliminary clinical evaluation
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DOI：
10.2214/ajr.06.0748
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发表时间：
2007-04-01
影响因子：
5
通讯作者：
Moriyama, Noriyuki
中科院分区：
文献类型：
--
作者：
Kanematsu, Masayuki;Goshima, Satoshi;Moriyama, Noriyuki
客观的。本研究的目的是确定前瞻性自适应导航校正是否可以在保持图像质量的同时提高切片位置不变性，并能够在钆增强肝脏多相薄层 3D MRI 上进行有效的电影显示观察。材料和方法。该研究由两部分组成：模型研究和临床研究。为了探索导航器校正的效果，对静止状态和连续运动的体模进行了成像。在临床研究中，回顾性评估了钆增强四相 3D 损坏涡轮场回波图像（3 毫米厚度，无交叉间隙，整个肝脏 60 个切片）。受试者为 83 名患有 130 个局灶性肝脏病变的患者，随机分为两组：使用导航校正 (n = 45) 和不使用导航校正 (n = 38)。由两名盲法放射科医生使用三点切片位置不变量表对肝脏和局灶性肝脏病变进行定性评估。对由于运动或伪影造成的图像退化进行了定性评估。结果。获得的幻影图像具有出色的切片位置不变性，同时通过导航校正保持图像质量。导航校正大大降低了两名患者的图像质量（一名患者有大量腹水，另一名患者有较大肝囊肿）。在其他 81 名患者中，使用（评分，2.84 +/- 0.43 [SD]）的肝脏切片位置不变性程度高于（评分，2.37 +/- 0.75）导航校正的肝脏切片位置不变性程度（p < 0.001）。对于局灶性肝脏病变，有（评分，2.95 +/- 0.21）的切片位置不变性也比没有（评分，2.18 +/- 0.88）导航校正更大（p < 0.0001）。无论有没有导航校正，图像质量下降的程度都没有差异。结论。前瞻性导航器校正可改善切片位置不变性或电影显示观察，同时保留肝脏钆增强多相薄层 3D MRI 的图像质量。
OBJECTIVE. The purpose of this study was to determine whether prospective adaptive navigator correction improves slice position invariability while maintaining image quality and enables efficient cine display observation on gadolinium-enhanced multiphasic thin-slice 3D MRI of the liver.MATERIALS AND METHODS. The study consisted of two parts: a phantom study and a clinical study. To explore the effect of navigator correction, a phantom was imaged in the resting state and in continuous movement. In the clinical study, gadolinium-enhanced four-phase 3D spoiled turbo field-echo images (3-mm thickness with no intersectional gap, 60 slices for whole liver) were retrospectively assessed. The subjects were 83 patients with 130 focal hepatic lesions randomized into two groups: with (n = 45) and without (n = 38) navigator correction. Images were qualitatively assessed by two blinded radiologists using a three-point slice position invariability scale for liver and focal hepatic lesions. Image degradation due to motion or artifacts was qualitatively assessed.RESULTS. Phantom images were obtained with excellent slice position invariability while image quality was maintained with navigator correction. Navigator correction substantially degraded the quality of the images of two patients (one with a large amount of ascites and the other with a large hepatic cyst). In the other 81 patients, the degree of slice position invariability for the liver was greater (p < 0.001) with (score, 2.84 +/- 0.43 [SD]) than without (score, 2.37 +/- 0.75) navigator correction. For focal hepatic lesions, slice position invariability also was greater (p < 0.0001) with (score, 2.95 +/- 0.21) than without (score, 2.18 +/- 0.88) navigator correction. No difference in degree of image degradation was found with or without navigator correction.CONCLUSION. Prospective navigator correction improves slice position invariability or cine display observation while preserving image quality for gadolinium-enhanced multiphasic thin-slice 3D MRI of the liver.