Three-dimensional Computer-assisted Animation of Atrial Tachyarrhythmias Recorded With a 64-Polar Basket Catheter

If the tilt of a specimen can be varied either by the strategy of observing identical particles orientated randomly or by use of a eucentric goniometer stage, three dimensional reconstruction procedures are available (l). If the specimens, such as small protein aggregates, lack periodicity, direct space methods compete favorably in ease of implementation with reconstruction by the Fourier (transform) space approach (2). Regardless of method, reconstruction is possible because useful specimen thicknesses are always much less than the depth of field in an electron microscope. Thus electron images record the amount of stain in columns of the object normal to the recording plates. For single particles, practical considerations dictate that the specimen be tilted precisely about a single axis. In so doing a reconstructed image is achieved serially from two-dimensional sections which in turn are generated by a series of back-to-front lines of projection data.

Download Full-text

Clinical Value of Computer-Assisted Taylor Three-dimensional External Fixation in the Treatment of Tibiofibular Fracture (Preprint)

10.2196/preprints.20711 ◽

2020 ◽

Author(s):

Hongfeng Sheng ◽

Weixing Xu ◽

Bin Xu ◽

Hongpu Song ◽

Di Lu ◽

...

Keyword(s):

Retrospective Study ◽

Internal Fixation ◽

External Fixation ◽

External Fixator ◽

Theoretical Basis ◽

New Technology ◽

Three Dimensional ◽

Computer Assisted ◽

Clinical Value

UNSTRUCTURED The retrospective study of Taylor's three-dimensional external fixator for the treatment of tibiofibular fractures provides a theoretical basis for the application of this technology. The paper collected 28 patients with tibiofibular fractures from the Department of Orthopaedics in our hospital from March 2015 to June 2018. After the treatment, the follow-up evaluation of Taylor's three-dimensional external fixator for the treatment of tibiofibular fractures and concurrency the incidence of the disease, as well as the efficacy and occurrence of the internal fixation of the treatment of tibial fractures in our hospital. The results showed that Taylor's three-dimensional external fixator was superior to orthopaedics in the treatment of tibiofibular fractures in terms of efficacy and complications. To this end, the thesis research can be concluded as follows: Taylor three-dimensional external fixation in the treatment of tibiofibular fractures is more effective, and the incidence of occurrence is low, is a new technology for the treatment of tibiofibular fractures, it is worthy of clinical promotion.

Download Full-text

Computer assisted three-dimensional reconstruction of scene in firearm homicide

Medico-Legal Journal ◽

10.1177/00258172211018359 ◽

2021 ◽

pp. 002581722110183

Author(s):

MA Kislov ◽

M Chauhan ◽

SN Zakharov ◽

SV Leonov ◽

YP Shakiryanova

Keyword(s):

Causes Of Death ◽

Scientific Evidence ◽

Three Dimensional ◽

Crime Scene ◽

Forensic Sciences ◽

Computer Assisted ◽

Three Dimensional Reconstruction ◽

Scientific Model ◽

Dimensional Reconstruction ◽

Promising Application

Worldwide advances in computer techniques are not yet recognised in the practice of forensic medicine. A promising application is their use in making a three-dimensional reconstruction of the crime scene. This study analyses this technique in a homicide by firearm. Queries regarding the direction and number of shots, position of the victim inside the car when shot at and presence of the accused at the crime scene were answered by a scientific model. Similar reconstruction of the scene, nailing the accused in a heinous crime, has not previously been reported as a study or a case. The paper anticipates impetus to the growth of literature in criminology and forensic sciences. It will also expedite the delivery of justice based on scientific evidence in controversial causes of death.

Download Full-text

Ablation of atrial tachyarrhythmias late after surgical repair of tetralogy of Fallot

Cardiology in the Young ◽

10.1017/s1047951110001447 ◽

2010 ◽

Vol 21 (1) ◽

pp. 31-38 ◽

Cited By ~ 1

Author(s):

Dan Raine ◽

John O’Sullivan ◽

Milind Chaudhari ◽

Leslie Hamilton ◽

Asif Hasan ◽

...

Keyword(s):

Catheter Ablation ◽

Tetralogy Of Fallot ◽

Surgical Repair ◽

Pulmonary Regurgitation ◽

Clinical Problem ◽

Guidance System ◽

Computer Assisted ◽

Atrial Tachyarrhythmias ◽

Jude Medical ◽

Repaired Tetralogy Of Fallot

AbstractBackgroundPatients with repaired tetralogy of Fallot may develop symptomatic and haemodynamic deterioration for many reasons such as arrhythmia, pulmonary regurgitation, and impairment in ventricular function. We describe a consecutive group of patients whose main clinical problem was atrial tachyarrhythmias.AimsTo describe the clinical outcome of atrial tachyarrhythmias occurring late after surgical repair of tetralogy of Fallot; to define the circuits/foci responsible for these atrial tachyarrhythmias; to evaluate the outcome of computer-assisted mapping and catheter ablation in this patient group.Methods and resultsConsecutive patients with surgically repaired tetralogy of Fallot and atrial tachyarrhythmias, who underwent catheter ablation between January, 2001 and June, 2007, were identified retrospectively from case records. Computer-assisted mapping was performed in all using either EnSite® (St Jude Medical Inc.) arrhythmia mapping and intra-cardiac catheter guidance system or CARTO™ (Biosense Webster Inc.) electroanatomical mapping systems. Ten patients (four males) with a median age of 39 plus or minus 8 years were studied. The total number of atrial tachyarrhythmias identified was 22 (six macro-reentrant, 16 micro-reentrant/focal). In nine patients, catheter ablation led to improvement in arrhythmia episodes and/or symptoms during follow-up of 41 plus or minus 20 months. Following ablation(s), five patients required pacing for pre-existing conduction disease and five needed further surgery for haemodynamic indications. All patients remained on anti-arrhythmic drugs.ConclusionsPatients with surgically repaired tetralogy of Fallot and atrial tachyarrhythmias typically have multiple arrhythmic circuits/foci arising from a scarred right atrium. Catheter ablation reduces arrhythmia frequency and improves symptoms. However, hybrid management is often required, comprising drugs, pacing, and further surgery tailored to the individual.

Download Full-text

ACCURACY OF GLOBAL ACTIVATION MAPPING USING A COLLAPSED MULTI-ELECTRODE BASKET CATHETER FOR ATRIAL TACHYARRHYTHMIAS

Canadian Journal of Cardiology ◽

10.1016/j.cjca.2015.07.514 ◽

2015 ◽

Vol 31 (10) ◽

pp. S245

Author(s):

A. Porta-Sanchez ◽

K. Viswanathan ◽

N. Jackson ◽

A. Al-Qubbany ◽

M. Kusha ◽

...

Keyword(s):

Atrial Tachyarrhythmias ◽

Basket Catheter ◽

Activation Mapping

Download Full-text

Inter-rater variability of three-dimensional fracture reduction planning according to the educational background

Journal of Orthopaedic Surgery and Research ◽

10.1186/s13018-021-02312-w ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Christoph Zindel ◽

Philipp Fürnstahl ◽

Armando Hoch ◽

Tobias Götschi ◽

Andreas Schweizer ◽

...

Keyword(s):

Distal Radius ◽

Clinical Experience ◽

Three Dimensional ◽

Computer Assisted Surgery ◽

Educational Background ◽

Fracture Reduction ◽

Computer Assisted ◽

Operation Planning ◽

Level Of Evidence ◽

Fragment Displacement

Abstract Background Computer-assisted three-dimensional (3D) planning is increasingly delegated to biomedical engineers. So far, the described fracture reduction approaches rely strongly on the performance of the users. The goal of our study was to analyze the influence of the two different professional backgrounds (technical and medical) and skill levels regarding the reliability of the proposed planning method. Finally, a new fragment displacement measurement method was introduced due to the lack of consistent methods in the literature. Methods 3D bone models of 20 distal radius fractures were presented to nine raters with different educational backgrounds (medical and technical) and various levels of experience in 3D operation planning (0 to 10 years) and clinical experience (1.5 to 24 years). Each rater was asked to perform the fracture reduction on 3D planning software. Results No difference was demonstrated in reduction accuracy regarding rotational (p = 1.000) and translational (p = 0.263) misalignment of the fragments between biomedical engineers and senior orthopedic residents. However, a significantly more accurate planning was performed in these two groups compared with junior orthopedic residents with less clinical experience and no 3D planning experience (p < 0.05). Conclusion Experience in 3D operation planning and clinical experience are relevant factors to plan an intra-articular fragment reduction of the distal radius. However, no difference was observed regarding the educational background (medical vs. technical) between biomedical engineers and senior orthopedic residents. Therefore, our results support the further development of computer-assisted surgery planning by biomedical engineers. Additionally, the introduced fragment displacement measure proves to be a feasible and reliable method. Level of Evidence Diagnostic Level II

Download Full-text

Advances in 3D Printing for Tissue Engineering

Materials ◽

10.3390/ma14123149 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3149

Author(s):

Angelika Zaszczyńska ◽

Maryla Moczulska-Heljak ◽

Arkadiusz Gradys ◽

Paweł Sajkiewicz

Keyword(s):

Tissue Engineering ◽

Additive Manufacturing ◽

3D Printing ◽

Complex Structure ◽

Three Dimensional ◽

Computer Assisted ◽

Scaffold Fabrication ◽

Manufacturing Techniques ◽

Printing Techniques ◽

State Of Art

Tissue engineering (TE) scaffolds have enormous significance for the possibility of regeneration of complex tissue structures or even whole organs. Three-dimensional (3D) printing techniques allow fabricating TE scaffolds, having an extremely complex structure, in a repeatable and precise manner. Moreover, they enable the easy application of computer-assisted methods to TE scaffold design. The latest additive manufacturing techniques open up opportunities not otherwise available. This study aimed to summarize the state-of-art field of 3D printing techniques in applications for tissue engineering with a focus on the latest advancements. The following topics are discussed: systematics of the available 3D printing techniques applied for TE scaffold fabrication; overview of 3D printable biomaterials and advancements in 3D-printing-assisted tissue engineering.

Download Full-text