Project Initiated to Advance Early Detection of Brain Aneurysms

Preventing deadly ruptures of the blood vessels in the brain is the aim of a new project to help radiologists detect aneurysms with far greater speed and accuracy.

The new method utilizes analytics technology developed by the Mayo Clinic (Rochester, MN, USA) and IBM (Armonk, NY, USA) collaboration, the Medical Imaging Informatics Innovation Center, and has proven a 95% accuracy rate in detecting aneurysms, compared with 70% for manual interpretation. Project findings were reported online November 24, 2009, in the Journal of Digital Imaging.

Already saving patients' lives, the project has examined more than 15 million images from thousands of patients since the project began in early July 2009. It uses technology that combines sophisticated imaging with analytics to highlight likely aneurysms for faster detection. This helps radiologists identify them before they result in brain hemorrhage or neurologic damage. In the future, the Mayo Clinic expects to use the same application for other radiology detection tests such as the diagnosis of cancer or vessel anomalies in other parts of the body.

"This fully automatic scheme is significant in helping radiologists detect aneurysms in magnetic resonance angiography [MRA] exams,” said Mayo radiologist Bradley Erickson, M.D., senior author of the study and codirector of the Medical Imaging Informatics Innovation Center at Mayo Clinic.

One out of 50 people in the United States has an unruptured brain aneurysm--an abnormal outward bulging in the blood vessels in the brain--and approximately 40% of all people who have a ruptured brain aneurysm will die as a result.

Traditionally, a patient suspected of having a brain aneurysm due to a stroke, traumatic injury, or family history would undergo an invasive test using a catheter that injects dye into the body, a technique with risks of neurologic complications. To improve the process of detection using noninvasive magnetic resonance angiography imaging technology, Mayo Clinic and IBM worked to create so-called "automatic reads” that run detection algorithms immediately following a scan.

Once images are acquired, they are automatically routed to servers in the Mayo and IBM Medical Imaging Informatics Innovation Center located on the Mayo campus, a collaborative research facility that combines advanced computing and image processing to provide faster, more accurate image analysis. There algorithms align and analyze images to locate and mark potential aneurysms--even very small ones less than 5 mm--so specially trained radiologists can conduct a further and final analysis.

From the time an image is taken to the time it is ready to be read by a radiologist, there often is only a 10-minute window. In that 10 minutes, the new workflow is able to identify images coming off the scanners and route those related to the head and brain through the special workflow, which then conducts automated aneurysm detection. On average, this can be done in three to five minutes, improving efficiency and saving valuable radiologist's time, leading to a faster diagnosis, which is especially important in the case of a serious aneurysm.

"Our joint work with Mayo Clinic on this project taps IBM's deep expertise in high performance computing and applies it to health analytics, enabling us to remove some of the time and efficiency barriers and making imaging an even more valuable preventative screening tool. Enabling broad access to this capability via cloud delivery is the natural next step,” said Bill Rapp, IBM's CTO of Healthcare and Life Sciences and codirector of the Medical Imaging Informatics Innovation Center.

The aneurysm detection system uses an algorithm developed by Mayo researchers that is executed on IBM WebSphere Process Server to model and orchestrate the automated workflow. Images are stored on IBM DB2 for Linux and Windows data service and workflow logic is run on IBM System x servers and IBM storage.

Related Links:
Mayo Clinic
IBM