In the years since, scientific developments have cast doubt on much of the evidence that was crucial to Chanthakoummane’s conviction.ĭr. Nevertheless, Chanthakoummane has always asserted that he is actually innocent. 17, 2007, a jury found him guilty of capital murder.
Composite mr contrast trial#
This composite sketch led McKinney police to Chanthakoummane, and after finding DNA evidence that linked him to the model house, McKinney police concluded in an Associated Press article that they were “confident in their arrest.”Ĭhanthakoummane’s trial began on Oct. The only eyewitnesses were another realtor and her husband, who had been at the model home the morning of Walker’s murder and had mistaken a man they saw outside the home for a potential client.īoth eyewitnesses subsequently underwent hypnosis performed by Texas Ranger Richard Shing, after which a composite sketch of the suspect was produced.
She had been stabbed 33 times, her nose and teeth were broken, her Rolex watch and wedding ring were missing and, significantly, she had been bitten by her attacker on her neck. Walker’s body, discovered in the kitchen of a model home by a house-hunting couple, was a gruesome sight. 17, 2022, despite significant doubt with his conviction due to its reliance on faulty and insufficient evidence.Ĭhanthakoummane was first found guilty of the murder of McKinney, Texas, real estate agent Sarah Walker in 2007. © 2019 International Society for Magnetic Resonance in Medicine.AUSTIN, TX-Kosoul Chanthakoummane is scheduled to be executed in Texas on Aug. It is a promising technique for semi-automatic segmentation of vessels that are hard to segment because of artifacts.īayesian statistics MR angiography artifact suppression multiple contrasts vessel segmentation.
Composite mr contrast registration#
However, small vessels that are sensitive to registration errors or visible only weakly in CE-MRA were susceptible to poor depiction in composite MRA.īy dynamically weighting vessel information from multiple contrasts and extracting their complementary information, the composite MRA produces reduced sequence-specific artifacts and improved vessel contrast. Compared with CE-MRA, the composite MRA showed conservative changes in vessel appearance to small threshold changes. For ICA segmentations, the composite MRA improved segmentation over CE-MRA per DSC (0.908 ± 0.037 vs. The composite MRA suppressed venous contaminations in CE-MRA, reduced flow artifacts, and velocity aliasing seen in PC-MRA and removed signal ambiguities in BB images. For 23 internal carotid artery (ICA) segments (N = 23) from evaluation subjects, segmentation accuracy of composite MRA was evaluated and compared against CE-MRA using dice similarity coefficient (DSC). To generate composite angiogram in evaluation subjects (N = 12), the voxel-wise vessel probabilities were weighted with a confidence measure and combined as a weighted product to yield angiogram intensity. To develop a method to use information from multiple MRI contrasts to produce a composite angiogram with reduced sequence-specific artifacts and improved vessel depiction.īayesian posterior vessel probability was determined as a function of black blood (BB), contrast enhanced angiography (CE-MRA), and phase-contrast MRA (PC-MRA) intensities from training subjects (N = 4).
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