其次，利用 3.0 - T MRI 扫描仪获取 T2 加权图像（T2WI），由放射科医生手动分割感兴趣区域（VOI），并使用 PyRadiomics 软件包提取 1781 个影像组学特征。 然后，运用树状管道优化工具（TPOT）算法，通过 5 折交叉验证构建诊断模型，并使用 Shapley Additive exPlanations（SHAP）值评估特征对模型的影响 。

MRI 是评估直肠癌肿瘤特征和潜在生物学行为的关键影像学工具。标准的直肠 MRI 包括高分辨率 T2 加权成像（High-resolution T2-weighted imaging，HR-T2WI）和扩散加权成像（Diffusion-weighted imaging，DWI）。HR-T2WI 能有效显示肿瘤浸润深度，DWI 有助于区分肿瘤与非肿瘤组织。

Endovaginal MRI (evMRI) at 3.0-T with T2-weighted (T2-W) and ZOnal Oblique Multislice (ZOOM)-diffusion-weighted imaging (DWI) potentially improves the detection of stage Ia/Ib1 cervical cancer. We ...

MRI IMAGING SEQUENCES. The most common MRI sequences are T1-weighted and T2-weighted scans. T1-weighted images are produced by using short TE and TR times. The contrast and brightness of the image are ...

Can index lesion tumor volume on T2 weighted MRI predict biochemical recurrence following radical prostatectomy?. JCO 35 , 32-32 (2017). DOI: 10.1200/JCO.2017.35.6_suppl.32 ...

Areas of abnormal white matter in the brains of multiple sclerosis (MS) patients appear much larger on diffusion tensor MRI than on T2-weighted MRI, a finding which could impact therapy options ...

However, such studies didn’t assess treatment effects or include the wide variety of clinical-grade two-dimensional scans of different contrasts (T1-weighted, T2-weighted, and T2-FLAIR contrasts ...

In the early days of MRI using conventional spin echo, proton density-weighted images were acquired automatically with a T2-weighted image. These were known as the “long TR, double echo” sequence.