{"doi":"10.7910/dvn/8jvlae","title":"3D Numerical Breast Phantoms and Ring-Array USCT measurements (3 rings)","abstract":"<h3>Dataset Summary</h3> <p> This is the companion dataset for the manuscript by Fu Li, Umberto Villa, Neb Duric, and Mark A. Anastasio titled <em>\"A forward model incorporating elevation-focused transducer properties for 3D full-waveform inversion in ultrasound computed tomography\"</em>. IEEE UFFC, <a href=\"https://doi.org/10.1109/TUFFC.2023.3313549\" target=\"_blank\"> link</a> (2023). </p> <p> The dataset comprises two types of thin-slab 3D numerical breast phantoms (NBPs) and their corresponding ring-array ultrasound computed tomography (USCT) simulated measurement data. </p> Two representative ACR BI-RADS breast composition types are selected: <li><strong>B:</strong> Scattered areas of fibroglandular density</li> <li><strong>C:</strong> Heterogeneously dense breast</li> Each NBP contains maps of acoustic properties (speed of sound, acoustic attenuation, and density). The corresponding ring-array USCT measurement data were simulated using the elevation-focused transducer described in the accompanying paper. Wave propagation simulations were conducted in lossy heterogeneous media using k-wave. </p> <hr> <h3>Dataset Structure</h3> <p>The dataset is organized into three folders:</p> <ul> <li>Dataset folder for phantom type <strong>B</strong></li> <li>Dataset folder for phantom type <strong>C</strong></li> <li>The <strong>imaging_system</strong> folder, which contains details about the 3D imaging system, including the excitation source, transducer coordinates, and lens thickness.</li> </ul> <p><strong>B:/C:</strong></p> <p> This dataset folder houses three sets of ring-array data, corresponding to acquisitions at three distinct elevation locations. As described in the manuscript, these locations are: ring -1 at z=-1.8mm, ring 0 at z=0mm, and ring 1 at z=1.8mm. The employed NBP and the associated simulated measurement data for each ring are provided. Specifically, the data files include </p> <ul> <li> <em>phantom.mat</em>: This .mat file contains three acoustic media: <ul> <li>sos: Speed of sound map (m/s) with dimensions [1280,1280,194] (x-,y-,z-direction) and a 0.2 mm pixel size. Data type is float32.</li> <li>aa: Acoustic attenuation map (Np/m/MHz) with dimensions [1280,1280,194] (x-,y-,z-direction) and a 0.2 mm pixel size. Data type is float32.</li> <li>density: Density map (kg/mm³) with dimensions [1280,1280,194] (x-,y-,z-direction) and a 0.2 mm pixel size. Data type is float32.</li> </ul> Note: These data are used to generate the corresponding acoustic media for each ring simulation by executing the Matlab script <i>generate_slab.m</i>. See the description of <i>generate_slab.m</i> for more details. <p> </li> <li> <em>data_ring_{i}.h5</em>: Measurement data of the i-th ring (for i = -1, 0, 1) . Measurement is stored with an hdf5 key that matches the transducer index. This is a two-dimensional array of size [1024,4200], where rows denote the receiver index and columns indicate the time sample. The sampling frequency is 25MHz. </li> </ul> <p><strong>imaging_system:</strong></p> <ul> <li><em>source300.mat</em>: Time profile of the excitation pulse. Comprises 300 time samples with a sampling frequency of 25MHz.</li> <li><em>receiver_locations_1024.mat</em>: XY coordinates (in mm) of the location for each receiver transducer in the imaging plane. Data type is float32 with an array size of [2x1024].</li> <li><em>emitter_locations_128.mat</em>: XY coordinates (in mm) of the location for each emitter transducer in the imaging plane. 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