Catasca J V, Mirowitz S A
Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110.
AJR Am J Roentgenol. 1994 Jan;162(1):61-7. doi: 10.2214/ajr.162.1.8273691.
The purpose of this study was to compare one optimized T2-weighted fast spin-echo sequence with one T2-weighted conventional spin-echo sequence to determine the impact of fast spin echo on image quality and diagnostic efficacy for evaluation of the abdomen.
A total of 32 patients with 43 lesions involving various abdominal organs were examined. T2-weighted fast spin-echo (4000/119/4, echo train length = 16, matrix = 256 x 256) and T2-weighted conventional spin-echo (3400-3800/80/2, matrix = 128 x 256) images were compared qualitatively and quantitatively to determine whether the two types of images differed with respect to tissue contrast, conspicuousness of lesions, image quality, and artifacts.
The signal intensity of all abdominal structures (except gallbladder and fat) was significantly lower on fast spin-echo images than on conventional spin-echo images. Qualitative liver-to-spleen contrast was significantly reduced on fast spin-echo images, whereas quantitative liver-to-spleen contrast was not significantly different. Blurring of anatomic structures, vascular pulsation, and chemical-shift misregistration artifacts were significantly reduced on fast spin-echo images. The qualitative conspicuousness and contrast-to-noise ratio for all lesions evaluated together were not significantly different (p = .5 and p = .069, respectively) on fast spin-echo vs conventional spin-echo images. However, qualitative conspicuousness and contrast-to-noise ratio of solid lesions were significantly reduced on fast spin-echo images (p = .022 and p = .01, respectively). The contrast-to-noise ratio of cystic lesions was significantly better (p = .002) on fast spin-echo images than on conventional spin-echo images.
Although the fast spin-echo protocol used in this study provides better image quality and contrast-to-noise ratio for cystic abdominal lesions than does conventional spin echo, the qualitative conspicuousness and contrast-to-noise ratio of solid abdominal lesions are decreased. Fast spin echo provides high-quality images with fewer artifacts in significantly less time than is possible with conventional spin-echo images. Further evaluation is necessary to determine the optimal protocol for T2-weighted fast spin-echo MR imaging of the abdomen.
本研究旨在比较一种优化的T2加权快速自旋回波序列与一种T2加权传统自旋回波序列，以确定快速自旋回波对腹部评估的图像质量和诊断效能的影响。
共检查了32例患有43个累及各种腹部器官病变的患者。对T2加权快速自旋回波（4000/119/4，回波链长度 = 16，矩阵 = 256×256）和T2加权传统自旋回波（3400 - 3800/80/2，矩阵 = 128×256）图像进行定性和定量比较，以确定这两种类型的图像在组织对比度、病变的明显程度、图像质量和伪影方面是否存在差异。
快速自旋回波图像上所有腹部结构（除胆囊和脂肪外）的信号强度均显著低于传统自旋回波图像。快速自旋回波图像上肝脏与脾脏的定性对比度显著降低，而定量肝脏与脾脏对比度无显著差异。快速自旋回波图像上解剖结构的模糊、血管搏动和化学位移配准伪影显著减少。快速自旋回波图像与传统自旋回波图像相比，所有评估病变的定性明显程度和对比噪声比无显著差异（分别为p = 0.5和p = 0.069）。然而，快速自旋回波图像上实性病变的定性明显程度和对比噪声比显著降低（分别为p = 0.022和p = 0.01）。快速自旋回波图像上囊性病变的对比噪声比显著优于传统自旋回波图像（p = 0.002）。
尽管本研究中使用的快速自旋回波方案比传统自旋回波为腹部囊性病变提供了更好的图像质量和对比噪声比，但腹部实性病变的定性明显程度和对比噪声比有所降低。快速自旋回波能在比传统自旋回波图像显著更短的时间内提供高质量图像且伪影更少。需要进一步评估以确定腹部T2加权快速自旋回波磁共振成像的最佳方案。
