Diffusion tensor imaging determines three‐dimensional architecture of human cervix: a cross‐sectional study

BackgroundMandibular reconstruction is conventionally performed freehand, CAD/CAM-assisted, or by using partially adjustable resection aids. CAD/CAM-assisted reconstructions are usually done in cooperation with osteosynthesis manufacturers, which entails additional costs and longer lead time. The purpose of this study is to analyze an in-house, open-source software-based solution for virtual planning.Methods and MaterialsAll consecutive cases between January 2019 and April 2021 that underwent in-house, software-based (Blender) mandibular reconstruction with a free fibula flap (FFF) were included in this cross-sectional study. The pre- and postoperative Digital Imaging and Com munications in Medicine (DICOM) data were converted to standard tessellation language (STL) files. In addition to documenting general information (sex, age, indication for surgery, extent of resection, number of segments, duration of surgery, and ischemia time), conventional measurements and three-dimensional analysis methods (root mean square error [RMSE], mean surface distance [MSD], and Hausdorff distance [HD]) were used.ResultsTwenty consecutive cases were enrolled. Three-dimensional analysis of preoperative and virtually planned neomandibula models was associated with a median RMSE of 1.4 (0.4–7.2), MSD of 0.3 (-0.1–2.9), and HD of 0.7 (0.1–3.1). Three-dimensional comparison of preoperative and postoperative models showed a median RMSE of 2.2 (1.5–11.1), MSD of 0.5 (-0.6–6.1), and HD of 1.5 (1.1–6.5) and the differences were significantly different for RMSE (p < 0.001) and HD (p < 0.001). The difference was not significantly different for MSD (p = 0.554). Three-dimensional analysis of virtual and postoperative models had a median RMSE of 2.3 (1.3–10.7), MSD of -0.1 (-1.0–5.6), and HD of 1.7 (0.1–5.9).ConclusionsOpen-source software-based in-house planning is a feasible, inexpensive, and fast method that enables accurate reconstructions. Additionally, it is excellent for teaching purposes.

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Progressive brain changes in schizophrenia: a 1-year follow-up study of diffusion tensor imaging

Acta Neuropsychiatrica ◽

10.1111/j.1601-5215.2009.00422.x ◽

2009 ◽

Vol 21 (6) ◽

pp. 301-307 ◽

Cited By ~ 5

Author(s):

Miho Ota ◽

Satoko Obu ◽

Noriko Sato ◽

Katsuyoshi Mizukami ◽

Takashi Asada

Keyword(s):

Diffusion Tensor Imaging ◽

Diffusion Tensor ◽

Three Dimensional ◽

Anterior Cingulate ◽

Volume Data ◽

Cross Sectional ◽

Schizophrenic Patients ◽

Brain Changes ◽

Magnetic Resonance Imaging Mri

Objective:Recent cross-sectional studies suggest that brain changes in schizophrenia are progressive during the course of the disorder. However, it remains unknown whether this is a global process or whether some brain areas are affected to a greater degree. The aim of this study was to examine the longitudinal brain changes in patients with chronic older schizophrenia by magnetic resonance imaging (MRI).Methods:Three-dimensional (3D) T1-weighted and diffusion tensor (DT) MRI were performed twice on each of 16 chronic older schizophrenia patients (mean age = 58.1 ± 6.7 years ) with an interval of 1 year between imaging sessions. To clarify the longitudinal morphological and white matter changes, volume data and normalised diffusion tensor imaging (DTI) metrics were compared between the first and follow-up studies using a paired t-test.Results:Focal cortical volume loss was observed in the left prefrontal lobe and anterior cingulate on volumetric study. In addition, DTI metrics changed significantly at the bilateral posterior superior temporal lobes, left insula, genu of the corpus callosum and anterior cingulate.Conclusion:There are ongoing changes in the brains of schizophrenic patients during the course of the illness. Discrepancies between volume data and DTI metrics may indicate that the pattern of progressive brain changes varies according to brain region.

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Effect of flip-flops on lower limb kinematics during walking: a cross-sectional study using three-dimensional gait analysis

Irish Journal of Medical Science (1971 -) ◽

10.1007/s11845-016-1421-y ◽

2016 ◽

Vol 185 (2) ◽

pp. 493-501 ◽

Cited By ~ 7

Author(s):

T. Sharpe ◽

A. Malone ◽

H. French ◽

D. Kiernan ◽

T. O’Brien

Keyword(s):

Gait Analysis ◽

Lower Limb ◽

Three Dimensional ◽

Cross Sectional Study ◽

Sectional Study ◽

Cross Sectional ◽

Limb Kinematics ◽

Lower Limb Kinematics

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Association between stages of medial compartment osteoarthritis and three-dimensional knee alignment in the supine position: A cross-sectional study

Journal of Clinical Orthopaedics and Trauma ◽

10.1016/j.jcot.2019.10.011 ◽

2020 ◽

Vol 11 ◽

pp. S130-S136 ◽

Cited By ~ 1

Author(s):

Futoshi Ikuta ◽

Kei Yoneta ◽

Takeshi Miyaji ◽

Kenichi Kidera ◽

Akihiko Yonekura ◽

...

Keyword(s):

Supine Position ◽

Three Dimensional ◽

Cross Sectional Study ◽

Medial Compartment ◽

Sectional Study ◽

Knee Alignment ◽

Cross Sectional ◽

Medial Compartment Osteoarthritis

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Optimization of Surgeon Ergonomics With Three-dimensional Heads Up Display for Ophthalmic Surgeries

10.21203/rs.3.rs-519366/v1 ◽

2021 ◽

Author(s):

Yogita Gupta ◽

Radhika Tandon

Keyword(s):

Three Dimensional ◽

Cross Sectional Study ◽

3D Image ◽

Care Centre ◽

Sectional Study ◽

Eye Care ◽

Cross Sectional ◽

Surgical Microscope ◽

Before And After ◽

Display Monitor

Abstract Purpose: To describe the variables that may be utilized in the optimization of three dimensional heads up surgeries (3D-HUS) for achieving better ergonomics among ophthalmic surgeons. Methods: A cross-sectional study conducted at the operating room of a tertiary eye care centre, equipped with ARTEVO 800 3D surgical microscope and display monitor. The parameters noted were: monitor height (MH), surgeon eye to floor distance (ETFD) surgeon eye to monitor distance (ETMD) (Fig. 1a) and viewing tilt (VT) angle. The neck and eye strain of the surgeon and assistant were scored as per Borg’s CR-10 scale, before and after surgeries.Results: 15 surgeries were analysed. The minimum ETMD was 51 inches and eye strain reduced with shorted ETMD. VT and ETFD was higher for right eye surgeries. The optimum MH was between 50 to 55 inches. Overall, neck strain and eye strain were in the range of 0-3 and 0-1, respectively.Conclusion: The various parameters affecting 3D image quality, neck and eye strain are: chair height, viewing tilt angle, eye centration, monitor distance, laterality of the eye and room illumination.

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