scholarly journals Curvilinear Structure Enhancement with the Polygonal Path Image - Application to Guide-Wire Segmentation in X-Ray Fluoroscopy

2012 ◽  
pp. 9-16 ◽  
Author(s):  
Vincent Bismuth ◽  
Régis Vaillant ◽  
Hugues Talbot ◽  
Laurent Najman
Keyword(s):  
Guide Wire ◽  
Polygonal Path ◽  
X Ray ◽  
Structure Enhancement

scholarly journals A Symptomatic Coffee Bean: Acute Sigmoid Volvulus

2017 ◽  
Vol 11 (2) ◽  
pp. 348-351 ◽  
Author(s):  
Michael Scharl ◽  
Luc Biedermann
Keyword(s):  
Sigmoid Colon ◽  
Guide Wire ◽  
Outlet Obstruction ◽  
Primary Treatment ◽  
Sigmoid Volvulus ◽  
Coffee Bean ◽  
Diagnostic Colonoscopy ◽  
X Ray ◽  
Abdominal Emergency ◽  
Distended Abdomen

An acute sigmoid volvulus is due to the torsion of the sigmoid colon around its mesenteric axis. It mainly occurs in elderly patients and represents an abdominal emergency requiring urgent treatment. A 53-year-old male patient with severe craniocerebral injury and traumatic subarachnoidal bleeding 3 weeks prior presented on the ward with distended abdomen without abdominal pain, muscular defense, or resistances. He featured large volume diarrhea within the last few hours without signs of bleeding. A plain abdominal X-ray demonstrated a coffee bean sign indicating a sigmoid volvulus. A consequent CT scan of the abdomen revealed a deep outlet obstruction with massively dilated, elongated and twisted loop of the sigmoid colon and no signs of perforation. We performed emergency colonoscopy under the assumption of an acute sigmoid volvulus. After careful insertion of the endoscope completely refraining from insufflation of air or CO2, endoscopic reposition of the sigma could be achieved and a colonic drainage was placed over an inserted guide wire up to the proximal transverse colon. No relapse occurred and a diagnostic colonoscopy after 4 weeks revealed no tumor or polyps. Our report describes a classic case of acute sigmoid volvulus and undermines the potential of colonoscopy as conservative primary treatment of choice.

scholarly journals Robotic-assisted internal fixation of hip fractures: A fluoroscopy-based intraoperative registration technique

2000 ◽  
Vol 214 (2) ◽  
pp. 165-179 ◽  
Author(s):  
I Browbank ◽  
K Bouazza-Marouf ◽  
J Schnabler
Keyword(s):  
Internal Fixation ◽  
Hip Fractures ◽  
Orthopaedic Surgery ◽  
Guide Wire ◽  
Drilling Process ◽  
Robotic Assisted ◽  
X Ray ◽  
Pilot Hole ◽  
Hip Screw

The internal fixation of proximal femoral (hip) fractures is the most frequently performed orthopaedic surgery procedure. When using a sliding compression hip screw, a commonly used fixation device, accurate positioning of the device within the femoral neck-head is achieved by initially drilling a pilot hole. A cannulated component of the hip screw is then inserted over the guide wire (surgical drill bit), which is used to drill the pilot hole. However, in practice, this fluoroscopically controlled drilling process is severely complicated by a depth perception problem and, as such, a surgeon can require several attempts to achieve a satisfactory guide wire placement. A prototype robotic-assisted orthopaedic surgery system has therefore been developed, with a view to achieving accurate right-first-time guide wire insertions. This paper describes the non-invasive digital X-ray photogrammetry-based registration technique which supports the proposed robotic-assisted drilling scenario. Results from preliminary laboratory (in vitro) trials employing this registration technique indicate that the cumulative error associated with the entire X-ray guided robotic system is within acceptable limits for the guide wire insertion process.

scholarly journals Surgical Precision and Efficiency of a Novel Electromagnetic System Compared to a Robot-Assisted System in Percutaneous Pedicle Screw Placement of Endo-LIF

2021 ◽  
pp. 219256822110255
Author(s):  
Derong Xu ◽  
Xuexiao Ma ◽  
Lei Xie ◽  
Chuanli Zhou ◽  
Biao Kong
Keyword(s):  
Pedicle Screw ◽  
Navigation System ◽  
Guide Wire ◽  
Screw Placement ◽  
Pedicle Screw Placement ◽  
Robot Assisted ◽  
Electromagnetic Navigation ◽  
X Ray ◽  
Percutaneous Pedicle Screw ◽  
Electromagnetic Navigation System

Study Design: Retrospective database study. Objectives: To compare the accuracy and safety of 2 types of a computer-assisted navigation system for percutaneous pedicle screw placement during endoscopic lumbar interbody fusion. Methods: From May 2019 to January 2020, data of 56 patients who underwent Endo-LIF with a robot-assisted system and with an electromagnetic navigation system were compared. The pedicles in all patients were subjected to postoperative CT scan to assess screw correction by measuring the perpendicular distance between the pedicle cortical wall and the screw surface. The registration and matching time, guide-wire insertion time, the entire surgery time, and X-ray exposure time were recorded. Results: In the robot-assisted group, 25 cases with 100 percutaneous pedicle screws were included, and the excellent and good rate was 95%. In the electromagnetic navigation group, 31 cases with 124 screws were included, and the excellent rate was 97.6%. There was no statistical difference between the two groups ( P > 0.05). The registration time and the total time for the surgery also showed no statistical differences ( P > 0.05). The main difference between the two groups was the guide-wire insertion time and the X-ray exposure time ( P < 0.05). Conclusions: Both electromagnetic navigation and robot-assisted are safe and efficient for percutaneous pedicle screw placement. Electromagnetic navigation system has obvious advantages over robot-assisted in terms of faster guide-wire placement and less X-ray exposure. Robot-assisted for percutaneous pedicle screw placement offers a preoperative planning system and a stable registration system, with obvious drawbacks of a strict training curve.

scholarly journals X-ray guided placement of Freka Trelumina using a guide wire for treatment of acute pancreatitis

2017 ◽  
Vol 25 (4) ◽  
pp. 369
Author(s):  
Lin Yuan ◽  
Jun Jiang ◽  
Ping Zhang ◽  
Gui-Fang Yang
Keyword(s):  
Acute Pancreatitis ◽  
Guide Wire ◽  
X Ray

Identifying and tracking a guide wire in the coronary arteries during angioplasty from X-ray images

1997 ◽  
Vol 44 (2) ◽  
pp. 152-164 ◽  
Author(s):  
D. Palti-Wasserman ◽  
A.M. Brukstein ◽  
R.P. Beyar
Keyword(s):  
Coronary Arteries ◽  
Guide Wire ◽  
X Ray

scholarly journals Localization of endovascular tools in X-ray images using a motorized C-arm: visualization on HoloLens

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Yenjung Chen ◽  
Nilay Yatinkumar Shah ◽  
Subhra Sundar Goswami ◽  
Annkristin Lange ◽  
Felix von Haxthausen ◽  
...  
Keyword(s):  
Guide Wire ◽  
Three Dimensional ◽  
Arm Movements ◽  
Ground Truth ◽  
Depth Information ◽  
X Ray ◽  
Image Guided ◽  
Computed Tomography Scans ◽  
The Mean ◽  
Tip Position

AbstractC-arms are medical devices widely used for image-guided minimally invasive endovascular procedures. This technology requires considerable experience for the physicians to position the C-arm to obtain X-ray images of the endovascular tools. In addition, this image-guided therapy is based on two-dimensional images which lack depth information. The purpose of this study was to develop a system that controls the C-arm movements based on the previous position of the tip of a guide wire and the vessel information, and also displays the estimated tip position (specifically, the virtual line that would join the X-ray source and the projected tip in the flat-panel detector) on an augmented reality device (HoloLens). A phantom study was conducted to evaluate the system using intraoperative cone-beam computed tomography scans to obtain the reference tip position. The mean distance between the tip position (ground truth) and the virtual three-dimensional line was 1.18 mm. The proposed system was able to control the C-arm movements based on the position of the tip of the guide wire. The visualization on HoloLens also allowed a more intuitive understanding of the position of the endovascular tool related to the patient’s anatomy during the intervention.

scholarly journals Learning torus PCA based classification for multiscale RNA backbone structure correction with application to SARS-CoV-2

2021 ◽  
Author(s):  
Henrik Wiechers ◽  
Benjamin Eltzner ◽  
Kanti V. Mardia ◽  
Stephan F. Huckemann
Keyword(s):  
Correction Method ◽  
Training Data ◽  
Proof Of Concept ◽  
Data Set ◽  
X Ray ◽  
X Ray Crystallography ◽  
Rna Backbone ◽  
Backbone Structure ◽  
Mode Hunting ◽  
Structure Enhancement

Reconstructions of structure of biomolecules, for instance via X-ray crystallography or cryo-EM frequently contain clashes of atomic centers. Correction methods are usually based on simulations approximating biophysical chemistry, making them computationally expensive and often not correcting all clashes. We propose a computationally fast data-driven statistical method yielding suites free from within-suite clashes: From such a clash free training data set, devising mode hunting after torus PCA on adaptive cutting average linkage tree clustering (MINTAGE), we learn RNA suite shapes. With classification based on multiscale structure enhancement (CLEAN), for a given clash suite we determine its neighborhood on a mesoscopic scale involving several suites. As corrected suite we propose the Fréchet mean on a torus of the largest classes in this neighborhood. We validate CLEAN MINTAGE on a benchmark data set, compare it to a state of the art correction method and apply it, as proof of concept, to two exemplary suites adjacent to helical pieces of the frameshift stimulation element of SARS-CoV-2 which are difficult to reconstruct. In contrast to a recent reconstruction proposing several different structure models, CLEAN MINTAGE unanimously proposes structure corrections within the same clash free class for all suites.

Safely replacing a percutaneous endoscopic gastrostomy tube using a portable X-ray system at a patient’s home

2021 ◽  
Vol 14 (1) ◽  
pp. e238462
Author(s):  
Hitoshi Eguchi ◽  
Naoko E Katsuki ◽  
Ken-ichi Yamamoto ◽  
Masaki Tago
Keyword(s):  
Cerebral Infarction ◽  
Medical Care ◽  
Percutaneous Endoscopic Gastrostomy ◽  
Guide Wire ◽  
Percutaneous Endoscopic Gastrostomy Tube ◽  
X Ray ◽  
Endoscopic Gastrostomy ◽  
Tube Removal ◽  
Home Medical Care ◽  
Peg Tube

An 81-year-old woman who underwent percutaneous endoscopic gastrostomy (PEG) a year before, after cerebral infarction was receiving home medical care. The first accidental PEG tube removal occurred after clinic hours, and the home-care doctor visited her home to quickly reinsert the tube. After the narrowed fistula was dilated, the tube was reinserted with a guide wire. An X-ray taken with a CALNEO Xair, which is an easily portable X-ray system launched in 2018, confirmed that the tip of the PEG tube was successfully placed in the stomach. A similar accidental removal occurred 2 months later, and we managed it in the same way. Both events were resolved with a single radiograph without significant difficulty. With in-home medical care, PEG tube replacement can be performed easily and safely with a handy portable X-ray system.

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