scholarly journals Preliminary study of a novel method for conveying corrected image volumes in surgical navigation

2012 ◽  
Vol 9 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Amber L. Simpson ◽  
Prashanth Dumpuri ◽  
Janet E. Ondrake ◽  
Jared A. Weis ◽  
William R. Jarnagin ◽  
...  
Keyword(s):  
Surgical Navigation ◽  
Corrected Image ◽  
Novel Method ◽  
Preliminary Study

Abstract 309: Vasovasorum Volume Can Be Measured by Contrast-Enhanced 3D Carotid Duplex Ultrasound: Concept and Design of a Novel Method for Predicting Stroke Risk in Patients With Carotid Artery Stenosis

2014 ◽  
Vol 34 (suppl_1) ◽  
Author(s):  
Isibor J Arhuidese ◽  
Alexander Nodel ◽  
Umair Qazi ◽  
Diana Call ◽  
Bruce Perler ◽  
...  
Keyword(s):  
Stroke Risk ◽  
Duplex Ultrasound ◽  
Population Based ◽  
Severe Stenosis ◽  
Asymptomatic Patients ◽  
Grant Support ◽  
Contrast Enhanced ◽  
Novel Method ◽  
Preliminary Study ◽  
Selection For

Introduction: Stroke remains a leading cause of death and disability. The reliance on the occurrence of symptoms and degree of stenosis for selecting patients with carotid stenosis for intervention is not ideal because it is often seen that patients with severe stenosis remain asymptomatic while many patients with moderate stenosis experience stroke. Furthermore, the majority of patients are asymptomatic until they experience stroke. It is known that intimal neovascularization flourishes as atherosclerotic disease progresses; however no technique in current use adequately correlates neovascularization to stroke risk. Objective: With seed grant support from the Society for Vascular Surgery Foundation we are executing a study based on our hypothesis that Vasovasorum Volume (VVV) measured using CE-3DCDU as a valid tool for mapping stroke risk. Method: We are recruiting symptomatic and asymptomatic patients adjudged to have >50% and >70% stenosis respectively on routine duplex ultrasound. Vasovasorum volume is measured using CE-3DCDU in patients who are eligible for carotid endarterectomy. Plaque removed during surgery is marked, decalcified and immunostained with CD34. Thereafter, VVV is measured in the excised plaque using 3D reconstruction histometry. We then evaluate the reliability and accuracy of CE-3DCDU in relation to the histopathology and compare VVV in symptomatic and asymptomatic patients. Results: The preliminary study included six patients and the results show that VVV measurement in carotid ultrasound and histopathology is feasible and reproducible (Figures 1 and 2). Conclusion: Vasovasorum volume is a promising predictor of stroke risk. By identifying patients who are truly at high risk for stroke, VVV measured by CE-3DCDU will aid precise patient selection for intervention, thus prevent stroke, save lives, limit disability and expend health care resources in an informed manner. The next phase of this project involves the establishment of efficacy and a population based multi-center clinical trial to generate evidence required to incorporate VVV measured using CE-3DCDU into clinical practice.

The accuracy of surgical navigation in urologic surgery – a preliminary study

2015 ◽  
Vol 14 (6) ◽  
pp. e1329
Author(s):  
L. Zapala ◽  
I. Michałowska ◽  
O. Tayara ◽  
A. Lewicki ◽  
A. Antoniewicz
Keyword(s):  
Surgical Navigation ◽  
Urologic Surgery ◽  
Preliminary Study

scholarly journals Large-Deformation Image Registration of CT-TEE for Surgical Navigation of Congenital Heart Disease

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Shuiping Gou ◽  
Linlin Chen ◽  
Yu Gu ◽  
Liyu Huang ◽  
Meiping Huang ◽  
...  
Keyword(s):  
Congenital Heart Disease ◽  
Heart Disease ◽  
Congenital Heart ◽  
Surgical Navigation ◽  
Probability Model ◽  
Target Registration Error ◽  
Coarse Registration ◽  
Preoperative Ct ◽  
Novel Method ◽  
Anatomical Information

The surgical treatment of congenital heart disease requires navigational assistance with transesophageal echocardiography (TEE); however, TEE images are often difficult to interpret and provide very limited anatomical information. Registering preoperative CT images to intraoperative TEE images provides surgeons with richer and more useful anatomical information. Yet, CT and TEE images differ substantially in terms of scale and geometry. In the present research, we propose a novel method for the registration of CT and TEE images for navigation during surgical repair of large defects in patients with congenital heart disease. Valve data was used for the coarse registration to determine the basic location. This was followed by the use of an enhanced probability model map to overcome gray-level differences between the two imaging modalities. Finally, the rapid optimization of mutual information was achieved by migrating parameters. This method was tested on a dataset of 240 images from 12 infant, children (≤ 3 years old), and adult patients with congenital heart disease. Compared to the “bronze standard” registration, the proposed method was more accurate with an average Dice coefficient of 0.91 and an average root mean square of target registration error of 1.2655 mm.

scholarly journals Preliminary Study of a Surgical Navigation with Point Based Registration Method

2021 ◽  
pp. 6-9
Author(s):  
Tugrul Uslu ◽  
Levent Cetin ◽  
Erkin Gezgin
Keyword(s):  
Solution Method ◽  
Medical Literature ◽  
Surgical Navigation ◽  
Solid Model ◽  
Registration Method ◽  
Technological Advances ◽  
Study Results ◽  
Post Operation ◽  
Scope Of Application ◽  
Preliminary Study

By the help of technological advances such as the development of computer and imaging technologies, surgical navigation has started to be used rapidly in medical literature. It is one of the recent methods used to track surgical tools inside the operation volume. In light of vital advantages as operation safety, minimally invasive application compatibility, reduction of operation times and reduced post operation complication risks, surgical navigation has been rapidly adopted throughout the relevant fields. Considering these, this study both tries to apply an introduced analytical method to one of the most important steps of surgical navigation as registration and compares the results within the scope of application compatibility. Throughout the study, a solid model with known dimensions was placed inside a capture volume in which the motion cameras are able to provide position measurements. Carrying out point based registration method by taking necessary measurements, relation between the model reference and measurement space reference was calculated by means of a transformation matrix. Using acquired relationship, measured landmark positions of the model were compared with the structurally known real landmark positions. At the end of the study results were given and the applicability of the introduced analytical solution method in point based registration is discussed.

Lateral Instability Detection

2014 ◽  
Author(s):  
Parham Shahidi ◽  
Brad Hopkins ◽  
Dan Maraini ◽  
Andrew Seidel
Keyword(s):  
Dynamic Instability ◽  
Measurement Techniques ◽  
Lateral Instability ◽  
Railroad Industry ◽  
Rail Vehicles ◽  
Challenging Tasks ◽  
Novel Method ◽  
Preliminary Study ◽  
The Stability ◽  
Rotational Resistance

Lateral instability of rail vehicles, more colloquially known as “hunting” is a dynamic instability mode of high importance. In extreme cases hunting can lead to derailments, but more frequently it is the cause of a number of less catastrophic yet costly damages to track, truck, and lading. It is known in the railroad industry that wheel conicity inherently affects the stability of the rail car on the track. Additional factors include reduced warp restraint of the truck system, low truck/car body rotational resistance due to degraded side bearings, and hollow worn wheels. Nonetheless, reconditioning of these components does not always lead to the desired result of reduced lateral accelerations. Furthermore, with trains often consisting of up to 200 cars, worn truck systems may go undetected for long periods of time until either a Truck Hunting Detector (THD) or visual inspection reveals the issue. Accurate detection of hunting and estimation of hunting severity remain challenging tasks. The network of truck hunting detectors is sparse, provides limited insight, and is expensive to expand and maintain. Furthermore, the nature of the detection method does not provide the user with information about the cause of the failure. This increases the probability of reoccurrence of lateral instability in reconditioned truck systems. In this paper, the root causes, dynamic behavior, and existing measurement techniques are evaluated. Additionally, a novel method to detect dynamic instability is presented. This method has been developed to provide a new way to examine dynamic instability in a more direct and detailed manner. A preliminary study to evaluate the proposed method has been completed and the results are presented in this paper. To evaluate the benefit of the proposed method, the test data is measured against AAR limits.

scholarly journals Towards Markerless 3D Pose Estimation for Computer Assisted Orthopaedic Surgery: a Comparison Study of Depth Cameras

10.29007/zfg2 ◽  
2020 ◽  
Author(s):  
Jérôme Ogor ◽  
Guillaume Dardenne ◽  
Salaheddine Sta ◽  
Julien Bert ◽  
Hoel Letissier ◽  
...  
Keyword(s):  
Surgical Navigation ◽  
Real Data ◽  
Surgical Instruments ◽  
Computer Assisted ◽  
Clinical Environment ◽  
3D Pose Estimation ◽  
Point Pair ◽  
Depth Cameras ◽  
Computer Assisted Orthopaedic Surgery ◽  
Novel Method

This abstract addresses the problem of localizing surgical instruments during orthopaedic surgeries. Compared to usual approaches based on surgical navigation with markers, we propose here a novel method that estimates the 6-DoF pose of surgical instruments without specific markers using a depth camera. The goal of this paper is to compare, on real data, the registration precision of an algorithm called Point Pair Features (PPF) according to consumer depth cameras available on the market. Experimental validation using sawbones has been conducted and 8 cameras have been tested in realistic clinical environment. The Kinect Azure reports the best precision with a registration error of 1.13mm ± 1.00mm.

A preliminary study on surgical navigation for epiduroscopic laser neural decompression

2015 ◽  
Vol 229 (10) ◽  
pp. 693-702 ◽  
Author(s):  
Sangseo Jeon ◽  
Gun Woo Lee ◽  
Young Dae Jeon ◽  
Il-Hyung Park ◽  
Jaesung Hong ◽  
...  
Keyword(s):  
Surgical Navigation ◽  
Preliminary Study

scholarly journals Distorter Characterisation Using Mutual Inductance in Electromagnetic Tracking

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3059 ◽  
Author(s):  
Herman Jaeger ◽  
Pádraig Cantillon-Murphy
Keyword(s):  
Magnetic Field ◽  
Measurement Errors ◽  
Surgical Navigation ◽  
Sensor Arrays ◽  
Medical Robotics ◽  
Mutual Inductance ◽  
Electromagnetic Tracking ◽  
Novel Method ◽  
Transmitter Design ◽  
The Magnetic Field

Electromagnetic tracking (EMT) is playing an increasingly important role in surgical navigation, medical robotics and virtual reality development as a positional and orientation reference. Though EMT is not restricted by line-of-sight requirements, measurement errors caused by magnetic distortions in the environment remain the technology’s principal shortcoming. The characterisation, reduction and compensation of these errors is a broadly researched topic, with many developed techniques relying on auxiliary tracking hardware including redundant sensor arrays, optical and inertial tracking systems. This paper describes a novel method of detecting static magnetic distortions using only the magnetic field transmitting array. An existing transmitter design is modified to enable simultaneous transmission and reception of the generated magnetic field. A mutual inductance model is developed for this transmitter design in which deviations from control measurements indicate the location, magnitude and material of the field distorter to an approximate degree. While not directly compensating for errors, this work enables users of EMT systems to optimise placement of the magnetic transmitter by characterising a distorter’s effect within the tracking volume without the use of additional hardware. The discrimination capabilities of this method may also allow researchers to apply material-specific compensation techniques to minimise position error in the clinical setting.

The Ultrastructure of Metastatic Human Mammary Carcinoma After Prolonged Estrogen Therapy

1967 ◽  
Vol 25 ◽  
pp. 180-181
Author(s):  
John H.L. Watson ◽  
John L. Swedo ◽  
R.W. Talley
Keyword(s):  
Mammary Carcinoma ◽  
Osmium Tetroxide ◽  
Estrogen Therapy ◽  
Ultrastructural Level ◽  
Uranyl Acetate ◽  
Human Mammary Carcinoma ◽  
Surgical Biopsy ◽  
Lead Hydroxide ◽  
Preliminary Study ◽  
Hormonal Therapies

A preliminary study of human mammary carcinoma on the ultrastructural level is reported for a metastatic, subcutaneous nodule, obtained as a surgical biopsy. The patient's tumor had responded favorably to a series of hormonal therapies, including androgens, estrogens, progestins, and corticoids for recurring nodules over eight years. The pertinent nodule was removed from the region of the gluteal maximus, two weeks following stilbestrol therapy. It was about 1.5 cms in diameter, and was located within the dermis. Pieces from it were fixed immediately in cold fixatives: phosphate buffered osmium tetroxide, glutaraldehyde, and paraformaldehyde. Embedment in each case was in Vestopal W. Contrasting was done with combinations of uranyl acetate and lead hydroxide.

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