updated README.md

README.md

@@ -38,24 +38,76 @@ particular data set should be validated against the original data available thro
 
 The dataset includes 447 sagittal T1 and T2 MRI series collected from 218 patients across four hospitals.
 Segmentation masks indicating the vertebrae, intervertebral discs (IVDs), and spinal canal are also included.
+Segmentation masks were created manually by a medical trainee under the supervision of
+a medical imaging expert and an experienced musculoskeletal radiologist.
 
-In addition to MR images and segmentation masks, additional metadata (e.g., MRI machine manufacturer, pixel bandwidth, etc.) and limited
-patient characteristics (sex and age) are available to import and link with the corresponding image data.
+In addition to MR images and segmentation masks, additional metadata (e.g., scanner manufacturer, pixel bandwidth, etc.), limited
+patient characteristics (biological sex and age, when available), and radiological gradings indicating specific degenerative
+changes can be loaded with the corresponding image data.
 
 ## Dataset Structure
 
 ### Data Instances
 
+There are 447 images and corresponding segmentation masks for 218 unique patients.
+...
+
 ### Data Fields
 
+- Numeric representation of image
+- Numeric representation of segmentation
+  - vertebrae
+  - intervertebral discs
+  - spinal canal
+- Patient characteristics
+  - biological sex
+  - age
+- Scanner characteristics
+  - manufacturer
+  - etc.
 ### Data Splits
 
+The training set contains [x] images distributed as follows:
+
+- Unique individuals: [x]
+
+- Standard sagittal T1 images: [x]
+- Standard sagittal T2 images: [y]
+- Standard sagittal T2 SPACE images: [z]
+- 
+The validation set contains 87 images distributed as follows:
+
+- Unique individuals: [x]
+
+- Standard sagittal T1 images: [x]
+- Standard sagittal T2 images: [y]
+- Standard sagittal T2 SPACE images: [z]
+
+An additional hidden test set (not available through Hugging Face) is available on the [SPIDER Grand Challenge](spider.grand-challenge.org).
+
+## Image Resolution
+
+Standard sagittal T1 and T2 image resolution ranges from 3.3 x 0.33 x 0.33 mm to 4.8 x 0.90 x 0.90 mm. 
+Sagittal T2 SPACE sequence images had a near isotropic spatial resolution with a voxel size of 0.90 x 0.47 x 0.47 mm.
+[Source](https://spider.grand-challenge.org/data/)
+
 ## Dataset Curation
 
+The data have been curated to enable users to load any of the following:
+
+- Raw image files
+- Raw segmentation masks
+- Numeric representations of images in tensor format
+- Numeric representations of segmentation masks in tensor format
+- Linked patient characteristics (limited to sex and age, if available)
+- Linked scanner characteristics
+  
 ### Source Data
 
 ### Processing Steps
 
+TBD (will include conversion of .mha files to numeric representations)
+
 ## Additional Information
 
 ### License