乳腺癌不同视野扩散加权成像的图像质量及应用价值比较。
Comparison of image quality and application values on different field-of-view diffusion-weighted imaging of breast cancer.
作者信息
Dong Haibo, Li Yadi, Yu Kang, Li Hui
机构信息
Department of Radiology, Lihuili Hospital of Ningbo Medical Center, Ningbo, Zhejiang, PR China
Department of Radiology, Lihuili Hospital of Ningbo Medical Center, Ningbo, Zhejiang, PR China.
出版信息
Acta Radiol. 2016 Jan;57(1):19-24. doi: 10.1177/0284185115569106. Epub 2015 Jan 30.
BACKGROUND
Single-shot echo planar imaging (SS-EPI) diffusion-weighted magnetic resonance imaging (DW-MRI) is the most-widely sequence in breast MRI. MRI artifacts and magnetic susceptibility are sometimes severe when this sequence is utilized at 3T.
PURPOSE
To compare the imaging quality, ADC values between SS-EPI DWI sequence and two reduced field-of-view (rFOV) DWI sequences of breast cancer.
MATERIAL AND METHODS
Twelve cases with breast cancer were scanned using SS-EPI DWI (FOV, 360 × 360 mm), rFOV DWI1 (FOV, 360 × 180 mm), and rFOV DWI2 (FOV, 280 × 140 mm), respectively. Image quality (scores 1 to 5) and ADC values of breast imaging were compared among three groups by different DWI sequences. SNR were compared between rFOV DWI1 and rFOV DWI2.
RESULTS
The imaging quality score of 12 cases was 5.00 in rFOV DWI1, 3.60 in SS-EPI DWI, and 3.75 in rFOV DWI2. The mean ADC value of 12 cases was 1.211 × 10(-3 )mm(2)/s in SS-EPI DWI, 1.107 × 10(-3 )mm(2)/s in rFOV DWI1, and 1.038 × 10(-3 )mm(2)/s in rFOV DWI2. SNR of rFOV DWI1 images was much higher than that of rFOV DWI2.
CONCLUSION
rFOV DWI1 is the optimal DWI sequence in our study. Comparing with SS EPI DWI, suitable rFOV DWI has an obvious advantage, which can present higher image resolution and less distortion. It may be helpful in the diagnosis of breast cancer.
背景
单次激发回波平面成像（SS-EPI）扩散加权磁共振成像（DW-MRI）是乳腺MRI中应用最广泛的序列。在3T场强下使用该序列时，MRI伪影和磁敏感性有时会很严重。
目的
比较SS-EPI DWI序列与两种缩小视野（rFOV）DWI序列对乳腺癌的成像质量及表观扩散系数（ADC）值。
材料与方法
分别采用SS-EPI DWI（视野，360×360mm）、rFOV DWI1（视野，360×180mm）和rFOV DWI2（视野，280×140mm）对12例乳腺癌患者进行扫描。通过不同的DWI序列比较三组乳腺成像的图像质量（1至5分）和ADC值。比较rFOV DWI1和rFOV DWI2之间的信噪比（SNR）。
结果
12例患者的成像质量评分在rFOV DWI1中为5.00，在SS-EPI DWI中为3.60，在rFOV DWI2中为3.75。12例患者的平均ADC值在SS-EPI DWI中为1.211×10⁻³mm²/s，在rFOV DWI1中为1.107×10⁻³mm²/s，在rFOV DWI2中为1.038×10⁻³mm²/s。rFOV DWI1图像的SNR远高于rFOV DWI2。
结论
在本研究中，rFOV DWI1是最佳的DWI序列。与SS-EPI DWI相比，合适的rFOV DWI具有明显优势，可呈现更高的图像分辨率和更少的畸变。这可能有助于乳腺癌的诊断。
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