Proton2Carbon dataset: pairs of proton and carbon ion pencil beams images obtained using a scintillation detector

The Proton2Carbon dataset contains 547,224 pairs of proton and carbon ion pencil beams images obtained using a scintillation detector. Each image represents a pulled back pencil beam that crossed an object located between the source and the detector at a given location in the imaging field of view. All details related to image acquisition can be found at https://doi.org/10.1002/mp.17645.

Each of the 547,224 images is a (W, H) = (608, 96) pixels .png image containing a (pulled back) pencil beam, with various levels of range mixing. The camera pixel size is approximately 0.41 mm; each image covers a physical field of view of approximately 250x40 mm². While the scintillator acquires raw images of size (608, 488), each image was cropped to a 4 cm region around the centre of the pencil beam in the height dimension to reduce the size of the images and network.

For users interested in image reconstruction, we provide the coordinate of the crop for each image in the cropped_coordinates.csv file such that the full (608, 488) images can be recreated. To recreate the full image, assuming that cropped_image is the (608, 96) image, one can do

full_image = np.zeros((608, 488))

full_image[yi:yf, xi:xf] = cropped_image

Where xi, xf, yi, yf are tabulated in the .csv file.

The dataset contains 12 zipped folders, one for each of the 12 scans introduced in section 1. The data structure is:

./<scan_number>/<ion_species>/<camera_view>_image_#.png

Where <scan_number>  {scan_1, …, scan_12} and correspond to the 12 geometries introduced in section 1, <ion_species>  {protons, carbon}, <camera_view> {lateral, top}, and # represents the number of the image, ranging from 1 to 22,801 for each combination of scan, ion species and camera view. The matching proton and carbon ion images will have the same filename except the <ion_species>.