Serial 3-Dimensional Computed Tomography and a Novel Method of Volumetric Analysis for the Evaluation of the Osteo-Odonto-Keratoprosthesis

Cornea ◽  
2013 ◽  
Vol 32 (4) ◽  
pp. 401-406 ◽  
Author(s):  
Zuzana Sipkova ◽  
Fook Chang Lam ◽  
Ian Francis ◽  
Jim Herold ◽  
Christopher Liu
Keyword(s):  
Computed Tomography ◽  
Volumetric Analysis ◽  
3 Dimensional ◽  
Novel Method

scholarly journals A Novel Method of Locating Foramen Ovale for Percutaneous Approaches to the Trigeminal Ganglion

2019 ◽  
Vol 4 (22;4) ◽  
pp. E345-E350
Author(s):  
Sung Hyun Lee
Keyword(s):  
Computed Tomography ◽  
Trigeminal Neuralgia ◽  
Trigeminal Ganglion ◽  
Surgical Approaches ◽  
Fluoroscopic Guidance ◽  
Foramen Ovale ◽  
Anatomic Landmarks ◽  
3 Dimensional ◽  
Percutaneous Procedures ◽  
Novel Method

Background: For patients with trigeminal neuralgia who do not respond to medication and for whom surgical approaches are too risky, percutaneous procedures targeting the trigeminal ganglion are the current standard treatment. Percutaneous procedures are performed via the transoval approach under radiologic guidance. Identification of the foramen ovale (FO) under fluoroscopic guidance is an important part of determining the success or failure of the procedures. Objectives: Previous studies have described how to visualize the FO under fluoroscopic guidance, but those methods are limited by poor reproducibility. In this study, we have investigated how to visualize the FO clearly and easily under fluoroscopic guidance. Study Design: Retrospective analysis. Setting: University hospital in Korea. Methods: Seventy-two 3-dimensional facial computed tomography scans without anatomic abnormalities of the skull base were analyzed for verifying the novel method. First, the mandibular angle and the occipital cortical line were overlapped and then turned by 15° oblique rotation using the software package. After these manipulations, the visualization of the FO was graded according to a 4-point scale (0: poor; 1: fair; 2: good; 3: excellent), and the inferior transfacial and oblique angles were measured. Results: This enabled clear visualization of the FO. The mean visual grade of 54 right and 46 left FO (total 100) was 2.74 (0: poor; 1: fair; 2: good; 3: excellent). All recorded FOs had at least grade 2 visibility. Limitations: This study is lacking application in clinical practice and comparative data to the submental view. Conclusions: The mandible angle and the occipital cortex line are obvious anatomic landmarks and are visible even to nonexperienced practitioners. Therefore, our method using these anatomic landmarks can improve the reproducibility and accuracy of FO visualization. Key words: Trigeminal neuralgia, foramen ovale, trigeminal ganglion, 3-dimensional (3D) facial computed tomography (CT) scans

scholarly journals A Novel Method for Precise Guided Hole Fabrication of Dental Implant Surgical Guide Fabricated with 3D Printing Technology

2020 ◽  
Vol 11 (1) ◽  
pp. 49
Author(s):  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
3D Printing ◽  
Dental Implant ◽  
Present Report ◽  
Free Software ◽  
3D Printer ◽  
Printing Technology ◽  
Surgical Guide ◽  
3 Dimensional ◽  
3D Printing Technology ◽  
Novel Method

A dental implant surgical guide fabricated by 3-dimensional (3D) printing technology is widely used in clinical practice due to its convenience and fast fabrication. However, the 3D printing technology produces an incorrect guide hole due to the shrinkage of the resin materials, and in order to solve this, the guide hole is adjusted using a trimmer or a metal sleeve is attached to the guide hole. These methods can lead to another inaccuracy. The present method reports a technique to compensate for a decreased guide hole caused by shrinkage that can occur when a computer-guided implant surgical guide is fabricated with a 3D printer. The present report describes a technique to adjust the size of the guide hole using a free software program to identify the optimized guide hole size that is fabricated with the 3D printer.

scholarly journals Visualization Ability of Phase-Contrast Synchrotron-Based X-Ray Imaging Using an X-Ray Interferometer in Soft Tissue Tumors

2021 ◽  
Vol 20 ◽  
pp. 153303382110101
Author(s):  
Thet-Thet Lwin ◽  
Akio Yoneyama ◽  
Hiroko Maruyama ◽  
Tohoru Takeda
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Spatial Resolution ◽  
Phase Contrast ◽  
Soft Tissue Tumors ◽  
X Ray ◽  
3 Dimensional ◽  
Computed Tomography Images ◽  
X Ray Imaging ◽  
X Ray Computed

Phase-contrast synchrotron-based X-ray imaging using an X-ray interferometer provides high sensitivity and high spatial resolution, and it has the ability to depict the fine morphological structures of biological soft tissues, including tumors. In this study, we quantitatively compared phase-contrast synchrotron-based X-ray computed tomography images and images of histopathological hematoxylin-eosin-stained sections of spontaneously occurring rat testicular tumors that contained different types of cells. The absolute densities measured on the phase-contrast synchrotron-based X-ray computed tomography images correlated well with the densities of the nuclear chromatin in the histological images, thereby demonstrating the ability of phase-contrast synchrotron-based X-ray imaging using an X-ray interferometer to reliably identify the characteristics of cancer cells within solid soft tissue tumors. In addition, 3-dimensional synchrotron-based phase-contrast X-ray computed tomography enables screening for different structures within tumors, such as solid, cystic, and fibrous tissues, and blood clots, from any direction and with a spatial resolution down to 26 μm. Thus, phase-contrast synchrotron-based X-ray imaging using an X-ray interferometer shows potential for being useful in preclinical cancer research by providing the ability to depict the characteristics of tumor cells and by offering 3-dimensional information capabilities.

scholarly journals Utility of 3-dimensional transoesophageal echocardiography for mitral annular sizing in transcatheter mitral valve replacement procedures: a cardiac computed tomography comparative study

2021 ◽  
Vol 22 (Supplement_1) ◽  
Author(s):  
A Coisne ◽  
F Pontana ◽  
S Aghezzaf ◽  
S Mouton ◽  
H Ridon ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Mitral Valve ◽  
Valve Replacement ◽  
Mitral Valve Replacement ◽  
Cardiac Computed Tomography ◽  
Transoesophageal Echocardiography ◽  
3 Dimensional ◽  
Ct Measurements ◽  
Good Ability ◽  
Transcatheter Mitral Valve Replacement

Abstract Funding Acknowledgements Type of funding sources: None. Background.  3-dimensional transoesophageal echocardiography (3D-TEE) is frequently used as an initial screening tool in the evaluation of patients who are candidates to Transcatheter Mitral Valve Replacement (TMVR). However, little is known about the imaging correlation with the gold-standard computed tomography (CT) imaging. We aimed at testing the quantitative differences between these two modalities and finding the best 3D-TEE parameters for TMVR screening. Methods. We included 57 patients referred to our Heart Valve Clinic for TMVR with prostheses specifically designed for the mitral valve. Mitral annulus (MA) analyses were performed using commercially available software in 3D-TEE and CT. Results. 3D-TEE was feasible in 52 patients (91%). Although 3D-TEE measurements were slightly lower than in CT, both measurements of projected MA area and perimeter showed excellent correlation with small differences between the two modalities (r = 0.88 and r = 0.92 respectively, p < 0.0001). Correlations were significant but lower for MA diameters (r = 0.68 to 0.72, p < 0.0001) and mitro-aortic angle (r = 0.53, p = 0.0001). ROC curve analyses showed that 3D-TEE had a good ability to predict TMVR screening success defined by constructors based on CT measurements with a range of 12.9 to 15cm² for MA area (AUC = 0.88-0.91, p < 0.0001), 128 to 139mm for MA perimeter (AUC = 0.85-0.91, p < 0.0001), 35 to 39mm for anteroposterior diameter (AUC = 0.79-0.84 p < 0.0001) and 37 to 42mm for posteromedial-anterolateral diameter (AUC = 0.81-0.89, p < 0.0001) (Figure 1). Conclusion. 3D-TEE measurements of MA dimensions display strong correlation with CT measurements in patients undergoing TMVR screening process. 3D-TEE should be proposed as a reasonable alternative to CT in this vulnerable population. Abstract Figure.

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