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Computed Tomography Images for Intracranial Hemorrhage Detection and Segmentation
Published: Aug. 1, 2019. Version: 1.0.0 <View latest version>
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Hssayeni, M. (2019). Computed Tomography Images for Intracranial Hemorrhage Detection and Segmentation (version 1.0.0). PhysioNet. https://doi.org/10.13026/w8q8-ky94.
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Goldberger, A., Amaral, L., Glass, L., Hausdorff, J., Ivanov, P. C., Mark, R., ... & Stanley, H. E. (2000). PhysioBank, PhysioToolkit, and PhysioNet: Components of a new research resource for complex physiologic signals. Circulation [Online]. 101 (23), pp. e215–e220.
After traumatic brain injury (TBI), intracranial hemorrhage (ICH) may occur that could lead to death or disability if it is not accurately diagnosed and treated in a time-sensitive procedure. Currently, Computerized Tomography (CT) scans are examined by radiologists to diagnose ICH and localize affected regions. In this work, we collected a dataset of 82 CT scans of patients with TBI. ICH regions in these scans were delineated in each slice by two radiologists. The radiologists also annotated each CT slice for the presence of different types of ICH and fractures.
Traumatic brain injury (TBI) is a major cause of death and disability in the United States, contributing to about 30% of all injury deaths as of 2013 . After accidents that involve TBI, extra-axial intracranial lesions may present, such as intracranial hemorrhage (ICH). An ICH is a critical medical lesion that is associated with a high rate of mortality . ICH is considered to be clinically dangerous because of its high risk of turning into a secondary brain insult that may lead to paralysis and death if it is not treated appropriately. Hemorrhages can be classified based upon their location in the brain: Intraventricular (IVH), Intraparenchymal (IPH), Subarachnoid (SAH), Epidural (EDH) and Subdural (SDH).
Computerized Tomography (CT) scans are commonly used in the emergency evaluation of patients with TBI to diagnose intracranial hemorrhage by capturing multiple layers of the brain . The availability of CT scans and their rapid acquisition time makes CT a preferred diagnostic tool over Magnetic Resonance Imaging (MRI) for initial hemorrhage assessment. CT scans generate a sequence of images using X-ray beams where brain tissues are captured with different intensities depending on the amount of X-ray absorbency of the tissue. CT scans are displayed using a windowing method, which converts Hounsfield units (HU) into grayscale values ([0, 255]) using two parameters: window level (WL) and window width (WW). Different windows allow different features of tissues to be displayed in a grayscale image (e.g., brain window, stroke window, or a bone window) . In CT scans using brain windows, hemorrhages appear as hyper intense regions with relatively undefined structure. CT images are examined by senior radiologists to determine whether a hemorrhage has occurred and if so, to detect the type and its region. However, this process can be lengthy, and subspecialty-trained neuroradiologists may not always be available to make an assessment.
Convolutional neural networks (CNN) have been shown to have excellent performance in automating multiple image classification and segmentation tasks . We hypothesized that deep learning algorithms have the potential to automate the diagnosing procedure of segmenting the ICH regions and detecting skull fracture, reducing the time taken for ICH diagnosis and potentially improving its accuracy. An automated ICH screen tool could be used to assist radiologists with less experience in detecting hemorrhage types, or when experts are not immediately available in the emergency room, which is especially prevalent in developing countries or remote areas.
A retrospective study was designed to collect head CT scans of subjects with TBI and it was approved by the research and ethics board in the Iraqi Ministry of Health, Babil Office. CT scans were collected between February and August 2018 from Al Hilla Teaching Hospital, Iraq. Information for each patient was anonymized.
A dataset of 82 CT scans was collected, including 36 scans for patients diagnosed with intracranial hemorrhage with the following types: Intraventricular, Intraparenchymal, Subarachnoid, Epidural and Subdural. Each CT scan for each patient includes about 30 slices with 5 mm slice-thickness. The mean and std of patients' age were 27.8 and 19.5, respectively. 46 of the patients were males and 36 of them were females. Each slice of the non-contrast CT scans was by two radiologists who recorded hemorrhage types if hemorrhage occurred or if a fracture occurred. The radiologists also delineated the ICH regions in each slice. There was a consensus between the radiologists. Radiologists did not have access to clinical history of the patients, and used a down-sampled version of the CT scan.
During data collection, syngo by Siemens Medical Solutions was first used to read the CT DICOM files and save two videos (avi format) using brain and bone windows, respectively. Second, a custom tool was implemented in Matlab and used to read the avi files, record the radiologist annotations, delineate hemorrhage region and save it as white region in a black 650x650 image (jpg format). Gray-scale 650x650 images (jpg format) for each CT slice were also saved for both windows (brain and bone).
Files and folders in the dataset are:
Patients_CT folder contains the CT scans, organized as follows:
- Sub-folder names match the patients numbers in the patient demographics file
- Each sub-folder further contains:
- all the brain-window CT slices for each patient, numbers of CT slices started from 1.
- the segmentation of the slices that have hemorrhage (named #HGE_Seg)
- all the bone-window CT slices for each patient, numbers of CT slices started from 1.
Python 3.5+ code,
split_data.py, is provided. This code loads the gray scale images of the brain window, resizes them, and saves them into sub-folders. An environment file is provided,
ct_ich.yml, which specifies the virtual environment that was used to execute the code. The virtual environment can be recreated using conda as follows:
conda env create -f ct_ich.yml
This will create the
ct_ich virtual environment for running the code.
Conflicts of Interest
The authors declare no conflict of interest.
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License (for files):
Creative Commons Attribution 4.0 International Public License