Santucci Domiziana, Lee Sheila S, Hartman Heidi, Walgampaya Shyama, AlObaidy Mamdoh, Ramalho Miguel, Dale Brian M, Semelka Richard C
MD, Department of Radiological Sciences, University of Rome "Sapienza", Rome, Italy, Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
MD, Department of Radiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Radiol Bras. 2017 Jul-Aug;50(4):216-223. doi: 10.1590/0100-3984.2015-0197.
The purpose of this study was to compare two short-tau inversion recovery (STIR) sequences, Cartesian and radial (BLADE) acquisitions, for breast magnetic resonance imaging (MRI) examinations.
Ninety-six women underwent 1.5 T breast MRI exam (48 Cartesian and 48 BLADE). Qualitative analysis including image artifacts, image quality, fat-suppression, chest-wall depiction, lesion detection, lymph node depiction and overall impression were evaluated by three blinded readers. Signal to noise ratios (SNRs) were calculated. Cronbach's alpha test was used to assess inter-observer agreement. Subanalyses of image quality, chest-wall depiction and overall impression in 15 patients with implants and image quality in 31 patients with clips were correlated using Pearson test. Wilcoxon rank sum test and -test were performed.
Motion artifacts were present in 100% and in 0% of the Cartesian and the BLADE exams, respectively. Chemical-shift artifacts were present in 8% of the Cartesian exams. Flow artifacts were more frequent on BLADE. BLADE sequence was statistically superior to Cartesian for all qualitative features ( < 0.05) except for fat-suppression ( = 0.054). In the subanalysis, BLADE was superior for implants and clips ( < 0.05). SNR was statistically greater for BLADE (48.35 vs. 16.17). Cronbach ranged from 0.502 to 0.813.
BLADE appears to be superior to Cartesian acquisition of STIR imaging as measured by improved image quality, fewer artifacts, and improved chest wall and lymph node depiction.
本研究旨在比较两种短反转时间反转恢复（STIR）序列，即笛卡尔采集和径向（刀锋式）采集，用于乳腺磁共振成像（MRI）检查。
96名女性接受了1.5T乳腺MRI检查（48例采用笛卡尔采集，48例采用刀锋式采集）。由三位不知情的阅片者对包括图像伪影、图像质量、脂肪抑制、胸壁显示、病变检测、淋巴结显示及总体印象在内的定性分析进行评估。计算信噪比（SNR）。采用克朗巴赫α检验评估观察者间的一致性。使用Pearson检验对15例植入物患者的图像质量、胸壁显示及总体印象以及31例有夹子患者的图像质量进行亚分析。进行Wilcoxon秩和检验和t检验。
笛卡尔采集和刀锋式采集的检查中，运动伪影分别出现在100%和0%的图像中。化学位移伪影出现在8%的笛卡尔采集中。流动伪影在刀锋式采集中更常见。除脂肪抑制外（P = 0.054），刀锋式序列在所有定性特征方面均在统计学上优于笛卡尔采集（P < 0.05）。在亚分析中，刀锋式采集对于植入物和夹子的显示更优（P < 0.05）。刀锋式采集的SNR在统计学上更高（48.35对16.17）。克朗巴赫系数范围为0.502至0.813。
通过改善图像质量、减少伪影以及改善胸壁和淋巴结显示来衡量，刀锋式采集的STIR成像似乎优于笛卡尔采集。
