Redistribute BTXRD (CC BY 4.0, figshare 27865398) in the fxr-dataset format

BTXRD/LICENSE

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+CC BY 4.0
+https://creativecommons.org/licenses/by/4.0/
+
+Derived from: https://doi.org/10.6084/m9.figshare.27865398
+Attribution: Yao, S., Huang, Y., Wang, X. et al. A radiograph dataset for the classification, localization, and segmentation of primary bone tumors. Sci. Data 12, 88 (2025). doi:10.1038/s41597-024-04311-y. Dataset: figshare, doi:10.6084/m9.figshare.27865398 (CC BY 4.0).

BTXRD/README.md

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+# BTXRD (musculoskeletal radiographs with primary bone tumor masks)
+
+Part of the FleXray data release. Repackaged from the original distribution at
+https://doi.org/10.6084/m9.figshare.27865398 under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).
+
+**Citation:** Yao, S., Huang, Y., Wang, X. et al. A radiograph dataset for the classification, localization, and segmentation of primary bone tumors. Sci. Data 12, 88 (2025). doi:10.1038/s41597-024-04311-y. Dataset: figshare, doi:10.6084/m9.figshare.27865398 (CC BY 4.0).
+
+## Contents
+
+- 1867 samples (test: 281, train: 1305, val: 281); one image and one label per sample.
+- `images/*.png`: 16-bit grayscale PNG, intensities in [0, 65535] map linearly to [0, 1].
+- `labels/`: dense index map (PNG). Label ids/channels:
+- `0`: background
+- `1`: tumor
+- `dataset.yml`: `fxr-dataset` manifest (schema version 1). Splits are the
+  ones used in the FleXray paper; `metadata.original_shape` is the source image shape.
+
+## Preprocessing
+
+Every image was min-max normalized to [0, 1] per image, padded to a square with zeros
+(centered) and resized to 256 x 256 (area interpolation for images, nearest for labels). Labels were remapped from the
+source annotation to the dataset-native names listed above; the FleXray package maps
+those names into its label protocol at training time.
+
+## Usage
+
+```bash
+pip install flexray
+fxr-dataset validate dataset.yml
+fxr-dataset pack dataset.yml /data/flexray/BTXRD
+```