scholarly journals 3D-CT vascular setting protocol using computer graphics for the evaluation of maxillofacial lesions

2001 ◽  
Vol 15 (3) ◽  
pp. 229-236 ◽  
Author(s):  
Marcelo de Gusmão Paraiso CAVALCANTI ◽  
Axel RUPRECHT ◽  
Michael Walter VANNIER
Keyword(s):  
Computer Graphics ◽  
Three Dimensional ◽  
3D Ct ◽  
3D Images ◽  
Quantitative Analyses ◽  
Axial Ct ◽  
Interactive 3D ◽  
Ct Slices

In this paper we present the aspect of a mandibular giant cell granuloma in spiral computed tomography-based three-dimensional (3D-CT) reconstructed images using computer graphics, and demonstrate the importance of the vascular protocol in permitting better diagnosis, visualization and determination of the dimensions of the lesion. We analyzed 21 patients with maxillofacial lesions of neoplastic and proliferative origins. Two oral and maxillofacial radiologists analyzed the images. The usefulness of interactive 3D images reconstructed by means of computer graphics, especially using a vascular setting protocol for qualitative and quantitative analyses for the diagnosis, determination of the extent of lesions, treatment planning and follow-up, was demonstrated. The technique is an important adjunct to the evaluation of lesions in relation to axial CT slices and 3D-CT bone images.

CT Artifacts of the Proximal Aortic Neck: An Important Problem in Endograft Planning

2002 ◽  
Vol 9 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Boonprasit Kritpracha ◽  
Jeremy Wolfe ◽  
Hugh G. Beebe
Keyword(s):  
Statistical Significance ◽  
Three Dimensional ◽  
Vessel Diameter ◽  
Maximum Diameter ◽  
Computed Tomographic ◽  
Aortic Neck ◽  
Preoperative Ct ◽  
Axial Ct ◽  
Ct Slices ◽  
Reformatted Ct

Purpose: To describe the imaging error introduced by noncircular abdominal aortic aneurysm (AAA) necks in axial and reformatted computed tomographic (CT) images and discuss the potential implications for aortic endografting. Methods: The records of 120 endograft patients with preoperative CT axial scans and subsequent 3-dimensional (3D) computerized reconstructions were reviewed. Maximum and minimum infrarenal aortic neck diameters were measured from axial CT scans and 3D reformatted slices at the same point on the vessel. Diameter measurements were made at the largest point within the 10-mm segment of vessel below the lowest renal artery. Excluded were aneurysms with proximal neck minimum diameters >30 mm, neck lengths <15 mm, or angulation >75° measured on the axial CT slice. Results: Measuring from reformatted CT slices, 86 (71.6%) cases had ≤2-mm differences between maximal and minimal neck diameters, comprising the “round neck” group A. In 34 (28.4%) cases, the neck was not round: 26 (21.7%) had diameter differences between 2 and 4 mm (group B) and 8 (6.7%) had a >4-mm difference (group C; range 4.1–8.1 mm). Although AAA diameter, neck length, and neck angle progressively increased as the difference between neck maximum and minimum diameters grew, i.e., greater eccentricity, these trends did not reach statistical significance. Mean infrarenal neck maximum diameter was significantly larger in group C (30.2 ± 3.4 mm) compared to groups A (23.0 ± 2.9 mm, p = 0.0002) and B (23.8 ± 3.6 mm, p = 0.0003). Hence, 28.4% of AAAs had a noncircular aortic neck of varying degree, and 6.7% had an eccentricity factor that may have clinical significance. Conclusions: This study confirms the importance of selecting an endoprosthesis sized 15% to 20% larger than the infrarenal aortic neck diameter. Three-dimensional reconstruction using reformatted CT slices perpendicular to the flow lumen is an important tool that offers enhanced accuracy of infrarenal aortic neck evaluation.

CRYST – a system to display 3D images of crystal structure, symmetry operations and crystal forms

1989 ◽  
Vol 22 (6) ◽  
pp. 633-639 ◽  
Author(s):  
T. Sakurai ◽  
K. Kobayashi ◽  
T. Horiki ◽  
M. Furukawa ◽  
K. Naitou
Keyword(s):  
Crystal Structure ◽  
Computer Graphics ◽  
Three Dimensional ◽  
Unit Cell ◽  
3D Images ◽  
Crystal Forms ◽  
Dimensional Image ◽  
Symmetry Operations

CRYST is a three-dimensional computer graphics program to help the understanding of crystallographic procedures. The three-dimensional image of a crystal structure is displayed, together with the arrangement of the symmetry elements in the unit cell. The symmetry-related atoms can be generated successively on a graphics screen by designating symmetry elements with a pen and tablet. Changes in morphology of a growing crystal may also be drawn by computer. Several applications of the system are described.

scholarly journals The accuracy of multi-slice three-dimensional computerized tomography on the verification of the pedicle screw trajectory

2009 ◽  
Vol 1 (1) ◽  
pp. 22
Author(s):  
Suat Erol Çelik ◽  
Bilal Kelten ◽  
Recai Gökcan ◽  
Ahmet Cevri Yıldız
Keyword(s):  
Pedicle Screw ◽  
Computerized Tomography ◽  
Spinal Surgery ◽  
Three Dimensional ◽  
Pedicle Screws ◽  
Ct Reconstruction ◽  
Axial Ct ◽  
Diagnostic Power ◽  
Ct Slices

The purpose of our study was to determine the diagnostic power of three-dimensional reformatted multi-slice computerized tomography (CT) images on misplaced pedicle screws in spinal surgery. Eighty-four consecutive patients with 458 screws in situ were investigated prospectively using both axial CT slices and reformatted images after operation by two blinded investigators. All the screw misplacements were documented and the differences between the two imaging modalities were recorded. Axial CT slices were able to show only 23 of 60 misplaced pedicle screws; multi-slice CT was three times more powerful in the diagnosis of pedicle screw complications in spinal surgery (p<0.05). We concluded that multi-slice CT reconstruction should be the primary diagnostic tool after screw implantation in the human spine.

scholarly journals A Comparison of Three-Dimensional and Two-Dimensional Cephalometric Evaluations of Children with Cleft Lip and Palate

2011 ◽  
Vol 05 (04) ◽  
pp. 451-458 ◽  
Author(s):  
Ozlem Tulunoglu ◽  
Elcin Esenlik ◽  
Ayse Gulsen ◽  
Ibrahim Tulunoglu
Keyword(s):  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Three Dimensional ◽  
Ct Images ◽  
Occlusal Plane ◽  
Frontal Analysis ◽  
3D Ct ◽  
3D Images ◽  
Study Results ◽  
2D And 3D

ABSTRACTObjectives: The aim of this retrospective study was to compare the consistency of orthodontic measurement performed on cephalometric films and 3D CT images of cleft lip and palate (CLP) patients. Methods: The study was conducted with 2D radiographs and 3D CT images of 9 boys and 6 girls aged 7-12 with CLP. 3D reconstructions were performed using MIMICS software. Results: Frontal analysis found statistical differences for all parameters except occlusal plane tilt (OcP-tilt) and McNamara analysis found statistical differences in 2D and 3D measurements for all parameters except ANS-Me and Co-Gn; Steiner analysis found statistical differences for all parameters except SND, SNB and Max1-SN. Intra-group variability in measurements was also very low for all parameters for both 2D and 3D images. Conclusions: Study results indicate significant differences between measurements taken from 2D and 3D images in patients with cleft lip and palate. (Eur J Dent 2011;5:451-458)

Computer Simulation for the Stereotactic Placement of Interstitial Radionuclide Sources into Computed Tomography-defined Tumor Volumes

Neurosurgery ◽  
1984 ◽  
Vol 14 (4) ◽  
pp. 442-448
Author(s):  
J. Kelly Patrick ◽  
A. Kall Bruce ◽  
Goerss Stephan
Keyword(s):  
Computed Tomography ◽  
Computer Simulation ◽  
Solid Tumor ◽  
Tumor Volume ◽  
Three Dimensional ◽  
Radioactive Source ◽  
Stereotactic Frame ◽  
Ct Data ◽  
Ct Slices

Abstract This report describes a method for the preoperative determination of radioactive interstitial source placement within computed tomography (CT)-defined tumor boundaries. The method utilizes CT data obtained under stereotactic conditions. Tumor boundaries are digitized from CT slices and are retained in a three-dimensional computer matrix. A solid tumor volume is created by an interpolation program and may be sliced orthogonal to any specific stereotactic surgical view line. The surgeon may simulate radioactive source placement within the slices and view the resultant isodose configuration against tumor contours on successive slices. Once the best source placement has been determined, the computer outputs the mechanical adjustments that will be necessary on a stereotactic frame located in the operating room for the stereotactic placement of each source and gives the length of each source. Sources are stereotactically implanted utilizing a double-catheter afterloading technique.

Quantitative Determination of Density Gradients by Three-Dimensional Computertomography (3D-CT)

1997 ◽  
Vol 132-136 ◽  
pp. 730-733 ◽  
Author(s):  
Torsten Rabe ◽  
Jürgen Goebbels ◽  
Andreas Kunzmann ◽  
Heinrich Riesemeier
Keyword(s):  
Quantitative Determination ◽  
Three Dimensional ◽  
Density Gradients ◽  
3D Ct

Three-Dimensional Computer Graphics for Surgical Procedure Learning: Web Three-Dimensional Application for Cleft Lip Repair

2006 ◽  
Vol 43 (3) ◽  
pp. 266-271 ◽  
Author(s):  
Masahiro Kobayashi ◽  
Tatsuo Nakajima ◽  
Ayako Mori ◽  
Daigo Tanaka ◽  
Toyomi Fujino ◽  
...  
Keyword(s):  
Computer Graphics ◽  
Surgical Procedures ◽  
Cleft Lip ◽  
Skin Flap ◽  
3D Structure ◽  
Three Dimensional ◽  
Image Data ◽  
3D Animation ◽  
3D Ct ◽  
Flap Design

Objective In surgical procedures for cleft lip, surgeons attempt to use various skin incisions and small flaps to achieve a better and more natural shape postoperatively. They must understand the three-dimensional (3D) structure of the lips. However, they may have difficulty learning the surgical procedures precisely from normal textbooks with two-dimensional illustrations. Recent developments in 3D computed tomography (3D-CT) and laser stereolithography have enabled surgeons to visualize the structures of cleft lips from desired viewpoints. However, this method cannot reflect the advantages offered by specific surgical procedures. To solve this problem, we used the benefits offered by 3D computer graphics (3D-CG) and 3D animation. Design and Results By using scanning 3D-CT image data of patients with cleft lips, 3D-CG models of the cleft lips were created. Several animations for surgical procedures such as incision designs, rotation of small skin flaps, and sutures were made. This system can recognize the details of an operation procedure clearly from any viewpoint, which cannot be acquired from the usual textbook illustrations. This animation system can be used for developing new skin-flap design, understanding the operational procedure, and using tools in case presentations. The 3D animations can also be uploaded to the World Wide Web for use in teleconferencing.

scholarly journals High-Resolution Three-Dimensional Computed Tomography for Assessing Complications Related to Intrathecal Drug Delivery

2016 ◽  
Vol 5;19 (5;19) ◽  
pp. E775-E780
Author(s):  
Matthias Morgalla
Keyword(s):  
Computed Tomography ◽  
Drug Delivery ◽  
Chronic Pain ◽  
High Resolution ◽  
Volume Rendering ◽  
Predictive Value ◽  
Three Dimensional ◽  
3D Ct ◽  
Intrathecal Drug Delivery ◽  
Axial Ct

Background: The assessment of the functionality of intrathecal drug delivery (IDD) systems remains difficult and time-consuming. Catheter-related problems are still very common, and sometimes difficult to diagnose. Objectives: The aim of the present study is to investigate the accuracy of high-resolution three-dimensional computed tomography (CT) in order to detect catheter-related pump dysfunction. Study Design: An observational, retrospective investigation. Setting: Academic medical center in Germany. Methods: We used high-resolution three dimensional (3D) computed tomography with volume rendering technique (VRT) or fluoroscopy and conventional axial-CT to assess IDDrelated complications in 51 patients from our institution who had IDD systems implanted for the treatment of chronic pain or spasticity. Results: Twelve patients (23.5%) presented a total of 22 complications. The main type of complication in our series was catheter-related (50%), followed by pump failure, infection, and inappropriate refilling. Fluoroscopy and conventional CT were used in 12 cases. High-resolution 3D CT VRT scan was used in 35 instances with suspected yet unclear complications. Using 3D-CT (VRT) the sensitivity was 58.93% – 100% (CI 95%) and the specificity 87.54% – 100% (CI 95%).The positive predictive value was 58.93% – 100% (CI 95%) and the negative predictive value: 87.54% – 100% (CI 95%). Fluoroscopy and axial CT as a combined diagnostic tool had a sensitivity of 8.3% – 91.7% (CI 95%) and a specificity of 62.9% – 100% (CI 95%). The positive predictive value was 19.29% – 100% (CI 95%) and the negative predictive value: 44.43% – 96.89% (CI 95%). Limitations: This study is limited by its observational design and the small number of cases. Conclusion: High-resolution 3D CT VRT is a non- invasive method that can identify IDDrelated complications with more precision than axial CT and fluoroscopy. Key words: Volume rendering technique (VRT), intrathecal drug delivery systems, highresolution 3D computed tomography, complications, spasticity, chronic pain, cost effectiveness, fluoroscopy

Abstract 1841: Left Atrial Volume From 3-dimensional CT Correlates With Atrial Fibrillation Recurrence Following Ablation

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Adam Helms ◽  
J. M Mangrum ◽  
J. P Mounsey ◽  
John P DiMarco ◽  
Srijoy Mahapatra ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Left Atrial ◽  
Left Atrial Volume ◽  
3 Dimensional ◽  
Linear Ablation ◽  
Axial Ct ◽  
The Mean ◽  
Ct Slices ◽  
Af Recurrence

Objective: Recurrence of atrial fibrillation (AF) following ablation is common, and further delineation of prognostic markers is needed. We investigated whether LA volume, which can be accurately obtained from 3-dimensional CT, correlates with AF recurrence. Methods: 73 consecutive patients (52 paroxysmal, 21 persistent) undergoing AF ablation were studied. Follow-up was for a minimum of 9 months, and success was determined by 12-lead EKG and lack of symptoms (unless symptoms proven not AF by Holter). LA volume was calculated by summation of axial CT slices. The left atrial appendage was measured separately. Results: Overall procedure success was 66% including 11 (15%) who had repeat ablations and 9 (12%) who were on antiarrhythmics. Pulmonary vein isolation was performed in all, with additional linear ablation in 44 (60%). The mean (95% CI) LA volume for those with recurrent AF was 119 cc (104, 135) versus 98 cc (90, 106) for no recurrence (p=0.01, rank sum). Wide variation in LA volume was noted in both groups (see box plot). For those patients with a volume >135cc (n=11), 9 (82%) had recurrent AF. No correlation existed between recurrence and type of AF or ablation strategy. Patients who had received a linear ablation had a larger mean LA volume than those who had not (111 cc vs. 97 cc, p=0.03, rank sum). LA appendage volume was not associated with recurrence. Conclusion: LA volume variation is large in both those with and without successful AF ablations. Mean LA volume is significantly larger in those with recurrent AF. Patients with LA volumes >135 cc are very likely to experience recurrent AF. More aggressive ablation strategies may be required in patients with large LA volumes.

scholarly journals Swallow Magnetic Resonance Imaging Compared to 3D-Computed Tomography for Pouch Assessment and Hiatal Hernias After Roux-en-Y Gastric Bypass

2020 ◽  
Vol 30 (11) ◽  
pp. 4192-4197
Author(s):  
Daniel M. Felsenreich ◽  
Michael A. Arnoldner ◽  
Felix B Langer ◽  
Christoph Bichler ◽  
Natalie Vock ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Bariatric Surgery ◽  
Weight Regain ◽  
Three Dimensional ◽  
3D Ct ◽  
Resonance Imaging ◽  
Established Method ◽  
Pouch Volume

Abstract Introduction/Purpose Weight regain and weight loss failure after bariatric surgery are important issues that may require a weight regain procedure. Three-dimensional-computed tomography (3D-CT) is a well-established method allowing exact measurements of pouch volume. The aims of this study were to prove the applicability of swallow MRI as a non-ionizing procedure and compare it to 3D-CT in patients after weight regain procedures following RYGB. Materials and Methods Twelve post-RYGB patients who had a follow-up operation for weight regain before 12/2017 were included in this prospective study. Swallow MRI and 3D-CT were performed in each patient to evaluate the size of the anastomosis, pouch volume, and intrathoracic pouch migration (ITM). Results Mean pouch volume in swallow MRI and 3D-CT were 40.4 ± 21.0 ml and 43.5 ± 30.2 ml, respectively (p = 0.83), and pouch diameter at the maximal distention was 35.3 ± 5.9 ml (MRI) and 31.0 ± 10.0 ml (CT) (p = 0.16). The rate of ITM was 75% in both examinations (p = 1.0). Conclusion Swallow MRI is a valid method for the assessment of pouch volume in different phases of the swallowing process and is comparable to 3D-CT. The diagnosis of ITM using swallow MRI was equal to 3D-CT.

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