OBJECTIVE: This work presents qualitative and quantitative side-by-side comparisons of oblique coregistered magnetic resonance imaging (MRI) scans and ultrasound images obtained during 35 neurosurgical procedures. METHODS: Spatially registered series of ultrasound images were recorded for subsequent off-line evaluation and comparison with corresponding preoperative MRI studies. The degree of misalignment was reduced by reregistering the target volume directly with segmented features. RESULTS: The initial apparent spatial misalignment of the target volume after craniotomy ranged from 0.11 to 8.73 mm (mean, 4.01 mm). After reregistration, the mutual information in overlapping segmented features was increased, presumably evidence of a better alignment locally. Additionally, the degree of feature congruence, which was assessed quantitatively through a convex hull approximation, demonstrated that the ultrasound volume was consistently smaller than its MRI counterpart. CONCLUSION: Although intraoperative ultrasound tends to be difficult to interpret by itself, when accurately coregistered with preoperative MRI scans, its potential utility as a navigational guide is enhanced.
OBJECTIVE: This work presents qualitative and quantitative side-by-side comparisons of oblique coregistered magnetic resonance imaging (MRI) scans and ultrasound images obtained during 35 neurosurgical procedures. METHODS: Spatially registered series of ultrasound images were recorded for subsequent off-line evaluation and comparison with corresponding preoperative MRI studies. The degree of misalignment was reduced by reregistering the target volume directly with segmented features. RESULTS: The initial apparent spatial misalignment of the target volume after craniotomy ranged from 0.11 to 8.73 mm (mean, 4.01 mm). After reregistration, the mutual information in overlapping segmented features was increased, presumably evidence of a better alignment locally. Additionally, the degree of feature congruence, which was assessed quantitatively through a convex hull approximation, demonstrated that the ultrasound volume was consistently smaller than its MRI counterpart. CONCLUSION: Although intraoperative ultrasound tends to be difficult to interpret by itself, when accurately coregistered with preoperative MRI scans, its potential utility as a navigational guide is enhanced.
Authors: Pablo A Valdés; Xiaoyao Fan; Songbai Ji; Brent T Harris; Keith D Paulsen; David W Roberts Journal: Stereotact Funct Neurosurg Date: 2009-11-12 Impact factor: 1.875
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Authors: Elvis C S Chen; A Jonathan McLeod; John S H Baxter; Terry M Peters Journal: Int J Comput Assist Radiol Surg Date: 2015-04-11 Impact factor: 2.924
Authors: Inês Machado; Matthew Toews; Elizabeth George; Prashin Unadkat; Walid Essayed; Jie Luo; Pedro Teodoro; Herculano Carvalho; Jorge Martins; Polina Golland; Steve Pieper; Sarah Frisken; Alexandra Golby; William Wells Iii; Yangming Ou Journal: Neuroimage Date: 2019-08-22 Impact factor: 6.556