Multi-echo Cambridge
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## Subjects There are 89 subject datasets, collected from consenting neurotypical subjects with standard inclusion/exclusion criteria (English speaking, right handed, no history of neurological or psychiatric illness) and the protocol was approved by the Cambridge IRB (LREC 11/EE/0198). Collection of the data was funded by MRC P008747/1 (V.V.) ## Experimental Tasks BOLD data were collected eyes open at rest looking at a white screen. 4 echoes of a single 9.84 min multi-echo BOLD run, the echos are each single volumes. ## Data Acquisition Data were acquired with a Siemens Trio 3T MRI Scanner and a 32-channel receive-only head coil. Functional images of 139 volumes (9.84 min) were acquired with an ME EPI sequence with online reconstruction [repetition time (TR), 2.47 s; flip angle, 78°; matrix size, 64 × 64; in-plane resolution, 3.75 mm; field of view (FOV), 240 mm; 32 oblique slices, alternating slice acquisition slice thickness 4.4 mm with 10% gap (ascending interleaved order, i.e., "alt+z2" in AFNI coding); iPAT factor, 3; bandwidth (BW) = 1,698 Hz/pixel; TE = 12, 28, 44, and 60 ms]. Anatomical images were acquired using a T1-weighted magnetization prepared rapid gradient echo (MPRAGE) sequence [176 × 240 FOV; 1-mm in-plane resolution; inversion time (TI), 1,100 ms]. ## Comments added by Openfmri Curators ### Defacing Pydeface was used on all anatomical images to ensure de-identification of subjects. The code can be found at https://github.com/poldracklab/pydeface ### Quality Control MRIQC was run on the dataset. Results are located in derivatives/mriqc. Learn more about it here: https://mriqc.readthedocs.io/en/stable/
## 受试者情况 本数据集包含89份受试者数据，所有数据均来自签署知情同意书的神经典型受试者（neurotypical），纳入/排除标准符合通用规范：英语为母语、右利手、无神经或精神疾病病史。本研究方案已获得剑桥大学伦理审查委员会（IRB）批准，审批编号为LREC 11/EE/0198。数据采集工作由英国医学研究理事会（Medical Research Council, MRC）项目P008747/1（V.V.）资助。 ## 实验任务 采集了受试者睁眼静息状态下注视白色屏幕时的血氧水平依赖（Blood Oxygen Level Dependent, BOLD）数据。单次多回波BOLD扫描时长为9.84分钟，共获得4组回波信号，每组回波对应单个体积图像。 ## 数据采集 数据采集使用西门子（Siemens）Trio 3T磁共振扫描仪及32通道接收型头部线圈。采用多回波平面回波（Multi-Echo Echo Planar Imaging, ME-EPI）序列配合在线重建模式，采集得到139个体积的功能图像（总时长9.84分钟），具体参数如下：重复时间（TR）2.47秒、翻转角78°、矩阵尺寸64×64、平面内分辨率3.75毫米、视野（FOV）240毫米、32层斜向切片、交替切片采集模式：切片厚度4.4毫米，层间间隙10%，采用升序交错采集顺序（即AFNI编码中的"alt+z2"）、并行采集加速因子（iPAT）为3、带宽（BW）1698赫兹/像素、回波时间（TE）分别为12、28、44及60毫秒。 解剖图像采用T1加权磁化准备快速梯度回波（T1-weighted Magnetization Prepared Rapid Gradient Echo, MPRAGE）序列采集，参数如下：视野176×240、平面内分辨率1毫米、反转时间（TI）1100毫秒。 ## Openfmri数据管理员补充说明 ### 去标识化处理 所有解剖图像均使用Pydeface工具完成去标识化处理，相关代码可访问：https://github.com/poldracklab/pydeface ### 质量控制 本数据集已通过MRIQC完成质量评估，评估结果存储于derivatives/mriqc目录下。如需了解更多相关信息，可访问：https://mriqc.readthedocs.io/en/stable/
