Int J Comput Assist Radiol Surg - Patch-based label fusion segmentation of brainstem structures with dual-contrast MRI for Parkinson's disease.

Tópicos

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Resumo

RPOSE: Parkinson's disease (PD) is a neurodegenerative disorder that impairs the motor functions. Both surgical treatment and study of PD require delineation of basal ganglia nuclei morphology. While many automatic volumetric segmentation methods have been proposed for the lentiform nucleus, few have attempted to identify the key brainstem substructures including the subthalamic nucleus (STN), substantia nigra (SN), and red nucleus (RN) due to their small size and poor contrast in conventional T1W MRI.METHODS: A dual-contrast patch-based label fusion method was developed to segment the SN, STN, and RN using multivariate cross-correlation. Two different MRI contrasts (T2*w and phase) are produced from a multi-contrast multi-echo FLASH MRI sequence, enabling visualization of these nuclei. T1-T2* fusion MRI was used to resolve the issue of poor nuclei (i.e., the STN, SN, and RN) contrast on T1w MRI, and to mitigate susceptibility artifacts that may hinder accurate nonlinear registration on T2*w MRI. Unbiased group-wise registration was used for anatomical normalization between the atlas library and the target subject. The performance of the proposed method was compared with a state-of-the-art single-contrast label fusion technique.RESULTS: The proposed method outperformed a state-of-the-art single-contrast patch-based method in segmenting the STN, RN and SN, and the results were better than those reported in previous literature.CONCLUSION: Our dual-contrast patch-based label fusion method was superior to a single-contrast method for segmenting brainstem nuclei using a multi-contrast multi-echo FLASH MRI sequence. The method is promising for the treatment and research of Parkinson's disease. This method can be extended for multiple alternative image contrasts and other fields of applications.

Resumo Limpo

rpose parkinson diseas pd neurodegen disord impair motor function surgic treatment studi pd requir delin basal ganglia nuclei morpholog mani automat volumetr segment method propos lentiform nucleus attempt identifi key brainstem substructur includ subthalam nucleus stn substantia nigra sn red nucleus rn due small size poor contrast convent tw mrimethod dualcontrast patchbas label fusion method develop segment sn stn rn use multivari crosscorrel two differ mri contrast tw phase produc multicontrast multiecho flash mri sequenc enabl visual nuclei tt fusion mri use resolv issu poor nuclei ie stn sn rn contrast tw mri mitig suscept artifact may hinder accur nonlinear registr tw mri unbias groupwis registr use anatom normal atlas librari target subject perform propos method compar stateoftheart singlecontrast label fusion techniqueresult propos method outperform stateoftheart singlecontrast patchbas method segment stn rn sn result better report previous literatureconclus dualcontrast patchbas label fusion method superior singlecontrast method segment brainstem nuclei use multicontrast multiecho flash mri sequenc method promis treatment research parkinson diseas method can extend multipl altern imag contrast field applic

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