膝关节成像中具有重聚焦控制的3D各向同性涡轮自旋回波中等加权序列：与3D各向同性快速场回波序列的比较研究

3D isotropic turbo spin-echo intermediate-weighted sequence with refocusing control in knee imaging: comparison study with 3D isotropic fast-field echo sequence.

作者信息

Seo Jung Min, Yoon Young Cheol, Kwon Jong Won

机构信息

Department of Radiology, School of Medicine, Sungkyunkwan University, Seoul, Korea.

出版信息

Acta Radiol. 2011 Dec 1;52(10):1119-24. doi: 10.1258/ar.2011.110328.

DOI:10.1258/ar.2011.110328

PMID:22144425

Abstract

BACKGROUND

Three-dimensional (3D) turbo spin-echo (TSE) images have been used in imaging of the extremities and comparable diagnostic performance to two-dimensional (2D) TSE images has been reported in several studies. However, comparison of the 3D isotropic TSE intermediate-weighted sequence and 3D FFE sequence in terms of image quality has not been investigated.

PURPOSE

To compare the image quality of a 3D isotropic TSE intermediate-weighted sequence with refocusing control (volume isotropic turbo spin echo acquisition [VISTA]) and a 3D isotropic fast-field echo (FFE) sequence of the knee joint.

MATERIAL AND METHODS

3.0 T knee MRI with VISTA and 3D FFE sequences was performed in 10 healthy volunteers (3 men, 7 women; age range 26-30 years). Two radiologists with specialties in the musculoskeletal system assessed tissue contrast between the fluid-cruciate ligament (F-L), fluid-meniscus (F-M), and fluid-cartilage (F-C) based on a 4-point scale (1, poor; 2, fair; 3, good; and 4, excellent). Statistical analysis for inter-observer agreement and differences in grades in tissue contrast between VISTA and 3D FFE images (Wilcoxon signed-rank) were performed. For a quantitative analysis, the signal-to-noise ratio (SNR) was obtained by imaging phantom and noise-only image. Image contrast ratios (CRs) were calculated between F-L, F-M, and F-C in volunteer images of VISTA and 3D FFE and compared statistically with a paired t-test.

RESULTS

Based on qualitative analysis, VISTA had statistically superior grades of tissue contrast in F-L (P < 0.001) and F-M (P < 0.001). 3D FFE had superior but not statistically significant (P = 0.317) grades in F-C. Based on quantitative analysis, the SNR of the phantom imaging was higher in VISTA than that in 3D FFE (28.18 vs. 14.90). VISTA had superior CRs in F-L (P < 0.001) and F-M (P < 0.001). 3D FFE had superior CR in F-C (P = 0.038).

CONCLUSION

The VISTA sequence was superior in tissue contrast between F-M and F-L, and 3D FFE was superior in tissue contrast between F-C, subjectively and quantitatively.

摘要

背景

三维（3D）快速自旋回波（TSE）图像已用于四肢成像，多项研究报道其诊断性能与二维（2D）TSE图像相当。然而，尚未对3D各向同性TSE中等加权序列和3D快速场回波（FFE）序列的图像质量进行比较。

目的

比较具有重聚焦控制的3D各向同性TSE中等加权序列（容积各向同性快速自旋回波采集[VISTA]）和膝关节的3D各向同性快速场回波（FFE）序列的图像质量。

材料与方法

对10名健康志愿者（3名男性，7名女性；年龄范围26 - 30岁）进行3.0T膝关节MRI检查，采用VISTA和3D FFE序列。两名擅长肌肉骨骼系统的放射科医生基于4分制（1分，差；2分，一般；3分，好；4分，优）评估液体 - 交叉韧带（F - L）、液体 - 半月板（F - M）和液体 - 软骨（F - C）之间的组织对比度。对观察者间一致性以及VISTA和3D FFE图像之间组织对比度等级差异进行统计分析（Wilcoxon符号秩检验）。为进行定量分析，通过对体模成像和仅噪声图像获取信噪比（SNR）。计算VISTA和3D FFE志愿者图像中F - L、F - M和F - C之间的图像对比度比（CR），并采用配对t检验进行统计学比较。

结果

基于定性分析，VISTA在F - L（P < 0.001）和F - M（P < 0.001）的组织对比度等级上具有统计学优势。3D FFE在F - C的等级上具有优势，但无统计学意义（P = 0.317）。基于定量分析，体模成像的SNR在VISTA中高于3D FFE（28.18对14.90）。VISTA在F - L（P < 0.001）和F - M（P < 0.001）中具有更高的CR。3D FFE在F - C中具有更高的CR（P = 0.038）。