A polygonal approximation to direct scalar volume rendering

ShirleyPeter,; TuchmanAllan,

doi:10.1145/99308.99322

Cited by 250 publications

(172 citation statements)

References 15 publications

Supporting

Mentioning

167

Contrasting

Order By: Relevance

“…This can be achieved through ray casting (eg, [6]), projecting tetrahedra (eg, [13]), or several other means. Using specific parameters of focal length, detector dimensions, and field of view, DRRs sufficiently represent xray projections and have been used for numerous different procedures, including 2-D/3-D registration and radiotherapy [8,[13][14][15].…”

Section: Methodsmentioning

confidence: 99%

A Quantitative Method to Assess Focal Acetabular Overcoverage Resulting From Pincer Deformity Using CT Data

Murphy

Subhawong

Chhabra

et al. 2011

Clinical Orthopaedics &Amp; Related Research

View full text Add to dashboard Cite

Background Current assessment techniques for focal acetabular overcoverage are neither consistent nor quantitatively accurate. Questions/purposes We propose: (1) a method to precisely quantify the amount of focal acetabular overcoverage in a patient's pincer deformity based on CT data; (2) to evaluate the consistency of this method; and (3) to compare the method with conventional radiographic assessments.Methods We developed a method to assess focal acetabular overcoverage using points selected from CT scans along the acetabular rim after realigning the pelvis into a neutral position. Using four resampled and segmented pelvic CT scans of cadaveric specimens with virtually induced impingement, two observers independently tested the algorithm's consistency. Our algorithm assessed the amount of focal acetabular overcoverage using CT data and projected data from reconstructed radiographs. Results (1) We successfully showed the feasibility of the software to produce consistent, quantitative measurements. (2) Testing showed the average difference between observers in aligning the pelvis was 0.42°, indicative of a consistent approach. (3) Differences between measurements on three-dimensional (3-D) CT and simulated radiographs were significant. Conclusions The proposed method represents a new avenue in consistently quantifying focal acetabular overcoverage using CT models while correcting for pelvic tilt and rotation. Our analysis confirms AP hip radiograph simulations overestimate the amount of overhanging acetabular rim in a pincer deformity. Clinical Relevance This technique has potential to improve preoperative diagnostic accuracy and enhance surgical planning for correction of a pincer deformity resulting from focal acetabular overcoverage.

show abstract

Section: Methodsmentioning

confidence: 99%

A Quantitative Method to Assess Focal Acetabular Overcoverage Resulting From Pincer Deformity Using CT Data

Murphy

Subhawong

Chhabra

et al. 2011

Clinical Orthopaedics &Amp; Related Research

View full text Add to dashboard Cite

show abstract

“…Shirley et al [12] describe a method for projecting tetrahedrons onto the image plane. The tetrahedrons need to be sorted before projection.…”

Section: Unstructured Mesh Representationmentioning

confidence: 99%

Volumetric Real-Time Particle-Based Representation of Large Unstructured Tetrahedral Polygon Meshes

Voglreiter

Steinberger

Schmalstieg

et al. 2012

Lecture Notes in Computer Science

View full text Add to dashboard Cite

Abstract. In this paper we propose a particle-based volume rendering approach for unstructured, three-dimensional, tetrahedral polygon meshes. We stochastically generate millions of particles per second and project them on the screen in real-time. In contrast to previous rendering techniques of tetrahedral volume meshes, our method does not need a prior depth sorting of geometry. Instead, the rendered image is generated by choosing particles closest to the camera. Furthermore, we use spatial superimposing. Each pixel is constructed from multiple subpixels. This approach not only increases projection accuracy, but allows also a combination of subpixels into one superpixel that creates the well-known translucency effect of volume rendering. We show that our method is fast enough for the visualization of unstructured three-dimensional grids with hard real-time constraints and that it scales well for a high number of particles.

show abstract

“…The entry position is given by rasterization, but the computation of the exit point is not so straightforward. Hirche used an adaptation of the Projected tetrahedra algorithm by Shirley and Tuchman [ST90], while Wang et al [WTL * 04] computed ray-plane intersections for the current view ray to find the exit point.…”

Section: Thick Surfacesmentioning

confidence: 99%