A Fourier–Shannon approach to closed contours modelling

Bonciu, C; Léger, Christophe; Thiel, J.

doi:10.1002/1361-6374(199809)6:3<111::aid-bio1>3.3.co;2-v

Cited by 3 publications

(4 citation statements)

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“…The SC contour was modeled with the use of a B‐spline snake defined in a polar coordinate system (14, 15). Compared to the conventional B‐spline snake parameterized in the Cartesian coordinate system (16), the polar B‐spline snake more closely matches the geometry of the SC contour, which is approximately circular in axial images.…”

Section: Methodsmentioning

confidence: 99%

“…The resulting contours were compared with each other to test the inter‐ and intraobserver reproducibility. To study the parameter sensitivity of our SC contour‐detection technique, we ran the algorithm over a range of spline orders (3 and 4), numbers of control points (11–16), and weighing parameter α values (1, 10, and 100). For each combination of those parameters, we computed the RMS contour‐detection error in radius over all the images ( N = ∼160) in this study.…”

Section: Methodsmentioning

confidence: 99%

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Spinal cord atrophy in injured rodents: High‐resolution MRI

Ding¹,

Ramu²,

Narayana³

2007

Magnetic Resonance in Med

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Longitudinal magnetic resonance imaging (MRI) was performed in normal and spinal cord (SC)-injured rodents. A fast technique based on polar B-spline snake was developed to extract the SC contour from the MR images in order to estimate the cord atrophy. Based on pooled data from all of the imaging studies, the extracted contours correlated well with manually defined contours. Results from the injured group showed cord atrophy shortly after the contusion injury. The maximum amount of atrophy (9.7% ؎ 3.5% decrease in the cross-sectional area (CSA)) occurred mainly at the epicenter around 14 days postinjury. The caudal and rostral segments in the injured group did not exhibit significant atrophy compared to the normal controls.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Spinal cord atrophy in injured rodents: High‐resolution MRI

Ding¹,

Ramu²,

Narayana³

2007

Magnetic Resonance in Med

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show abstract

“…Parameterization is done using landmarks (other shape parameterization methods may be utilized, e.g. Fourier descriptors [3] or B-splines [23]). Landmarks are labeled either manually, as when a cardiologist labels the heart chamber boundaries [6,11], or (semi-)automatically [10].…”

Section: Statistical St-shape Variationmentioning

confidence: 99%

Deformable spatio-temporal shape models: extending active shape models to 2D+time

Hamarneh

Gustavsson

2004

Image and Vision Computing

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“…All examples of this section are related with this radiation problem in which G(x) is defined by Shannon's kernels. Shannon's kernels are widely used for modeling data in real processes and phenomena Bonciu and Thiel (1998); Wei (2001). We take data as e(x) = 0, f (x, t) = 0, g = (g 1 , g 2 , g 3 ), where…”

mentioning

confidence: 99%