Computed Tomography–Based Custom-Made Stem for Dysplastic Hips in Japanese Patients

2009 ◽  
Vol 24 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Kenji Kawate ◽  
Yutaka Ohneda ◽  
Tetsuji Ohmura ◽  
Hiroshi Yajima ◽  
Kazuya Sugimoto ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Japanese Patients ◽  
Custom Made

scholarly journals The Relationship Between the Width of the Frontal Recess and the Frontal Recess Cells in Japanese Patients

2019 ◽  
Vol 12 ◽  
pp. 117955061988494
Author(s):  
Seiichiro Makihara ◽  
Shin Kariya ◽  
Mitsuhiro Okano ◽  
Tomoyuki Naito ◽  
Kensuke Uraguchi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Frontal Sinus ◽  
Significant Positive Correlation ◽  
Japanese Patients ◽  
Cell Types ◽  
Sinus Surgery ◽  
Ct Scans ◽  
Frontal Sinusitis ◽  
Frontal Recess ◽  
The Relationship

Objective: The agger nasi cell (ANC) is an easily identifiable landmark when approaching the frontal sinus. The success of endoscopic frontal sinus surgery may be influenced by the width of the frontal recess (FR). The aim of this study is to examine the relationship between the FR width and the ANC size in Japanese patients. In addition, the effect of various frontal recess cells (FRCs) on the development of frontal sinusitis has been examined. Materials and methods: Multiplanar computed tomography (CT) scans of the nasal cavities and paranasal sinuses in 95 patients (190 sides) before endoscopic sinus surgery were reviewed. The presence of FRCs, the thickness of the frontal beak (FB), the ANC size, and the anterior-to-posterior (A-P) length of the frontal isthmus (FI) and FR were evaluated in patients with and without frontal sinusitis. Results: The prevalence of the ANC, frontal cell types 1, 2, 3, and 4, frontal bullar cell (FBC), suprabullar cell, supraorbital ethmoid cell, and interfrontal sinus septal cell was 85.3%, 11.6%, 0%, 7.9%, 0%, 25.3%, 45.8%, 16.8%, and 15.3%, respectively. The ANC volume showed a significant positive correlation with the A-P length of the FI and FR. The incidence of frontal sinusitis in the patients with FBCs was significantly higher than that without FBCs. Conclusion: A large ANC offers a greater potential to facilitating the approach to the frontal sinus because of the extensiveness of the FR in Japanese patients. The presence of FBCs may be related to a higher incidence of frontal sinusitis.

scholarly journals Relationships between computed tomography-assessed density, abdominal fat volume, and glucose metabolism after sleeve gastrectomy in Japanese patients with obesity

2019 ◽  
Vol 66 (7) ◽  
pp. 605-613 ◽  
Author(s):  
Yoshinori Ozeki ◽  
Takayuki Masaki ◽  
Yuichi Yoshida ◽  
Mitsuhiro Okamoto ◽  
Manabu Anai ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Sleeve Gastrectomy ◽  
Glucose Metabolism ◽  
Japanese Patients ◽  
Abdominal Fat ◽  
Fat Volume

Ultrasound Computed Tomography in Breast Imaging: First Clinical Results of a Custom-Made Scanner

2010 ◽  
Vol 31 (06) ◽  
pp. 604-609 ◽  
Author(s):  
M. Hollenhorst ◽  
C. Hansen ◽  
N. Hüttebräuker ◽  
A. Schasse ◽  
L. Heuser ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Breast Imaging ◽  
Clinical Results ◽  
Ultrasound Computed Tomography ◽  
Custom Made

scholarly journals Cumulative Inaccuracies in Implementation of Additive Manufacturing Through Medical Imaging, 3D Thresholding, and 3D Modeling: A Case Study for an End-Use Implant

2020 ◽  
Vol 10 (8) ◽  
pp. 2968 ◽  
Author(s):  
Jan Sher Akmal ◽  
Mika Salmi ◽  
Björn Hemming ◽  
Linus Teir ◽  
Anni Suomalainen ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Additive Manufacturing ◽  
Medical Imaging ◽  
3D Modeling ◽  
Computer Aided Design ◽  
Digital Design ◽  
Worst Case ◽  
Custom Made ◽  
End Use

In craniomaxillofacial surgical procedures, an emerging practice adopts the preoperative virtual planning that uses medical imaging (computed tomography), 3D thresholding (segmentation), 3D modeling (digital design), and additive manufacturing (3D printing) for the procurement of an end-use implant. The objective of this case study was to evaluate the cumulative spatial inaccuracies arising from each step of the process chain when various computed tomography protocols and thresholding values were independently changed. A custom-made quality assurance instrument (Phantom) was used to evaluate the medical imaging error. A sus domesticus (domestic pig) head was analyzed to determine the 3D thresholding error. The 3D modeling error was estimated from the computer-aided design software. Finally, the end-use implant was used to evaluate the additive manufacturing error. The results were verified using accurate measurement instruments and techniques. A worst-case cumulative error of 1.7 mm (3.0%) was estimated for one boundary condition and 2.3 mm (4.1%) for two boundary conditions considering the maximum length (56.9 mm) of the end-use implant. Uncertainty from the clinical imaging to the end-use implant was 0.8 mm (1.4%). This study helps practitioners establish and corroborate surgical practices that are within the bounds of an appropriate accuracy for clinical treatment and restoration.

scholarly journals Stopping power accuracy and achievable spatial resolution of helium ion imaging using a prototype particle CT detector system

2017 ◽  
Vol 3 (2) ◽  
pp. 401-404 ◽  
Author(s):  
Lennart Volz ◽  
Charles-Antoine Collins-Fekete ◽  
Pierluigi Piersimoni ◽  
Robert P. Johnson ◽  
Vladimir Bashkirov ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Spatial Resolution ◽  
Ion Beam ◽  
Reconstruction Algorithm ◽  
Detector System ◽  
Particle Therapy ◽  
Stopping Power ◽  
Proton Radiography ◽  
Custom Made ◽  
Particle Imaging

AbstractA precise relative stopping power map of the patient is crucial for accurate particle therapy. Charged particle imaging determines the stopping power either tomographically – particle computed tomography (pCT) – or by combining prior knowledge from particle radiography (pRad) and x-ray CT. Generally, multiple Coulomb scattering limits the spatial resolution. Compared to protons, heavier particles scatter less due to their lower charge/mass ratio. A theoretical framework to predict the most likely trajectory of particles in matter was developed for light ions up to carbon and was found to be the most accurate for helium comparing for fixed initial velocity. To further investigate the potential of helium in particle imaging, helium computed tomography (HeCT) and radiography (HeRad) were studied at the Heidel-berg Ion-Beam Therapy Centre (HIT) using a prototype pCT detector system registering individual particles, originally developed by the U.S. pCT collaboration. Several phantoms were investigated: modules of the Catphan QA phantom for analysis of spatial resolution and achievable stopping power accuracy, a paediatric head phantom (CIRS) and a custom-made phantom comprised of animal meat enclosed in a 2 % agarose mixture representing human tissue. The pCT images were reconstructed applying the CARP iterative reconstruction algorithm. The MTF10% was investigated using a sharp edge gradient technique. HeRad provides a spatial resolution above that of protons (MTF1010%=6.07 lp/cm for HeRad versus MTF10%=3.35 lp/cm for proton radiography). For HeCT, the spatial resolution was limited by the number of projections acquired (90 projections for a full scan). The RSP accuracy for all inserts of the Catphan CTP404 module was found to be 2.5% or better and is subject to further optimisation. In conclusion, helium imaging appears to offer higher spatial resolution compared to proton imaging. In future studies, the advantage of helium imaging compared to other imaging modalities in clinical applications will be further explored.

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