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Iskalni niz: "avtor" (Igor K%C3%B6ve%C5%A1) .

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1.
Human tooth pulp anatomy visualization by 3D magnetic resonance microscopy
Dušan Šušterčič, Igor Serša, 2012, izvirni znanstveni članek

Povzetek: Background. Precise assessment of dental pulp anatomy is of an extreme importance for a successful endodontic treatment. As standard radiographs of teeth provide very limited information on dental pulp anatomy, more capable methods are highly appreciated. One of these is 3D magnetic resonance (MR) microscopy of which diagnostic capabilities in terms of a better dental pulp anatomy assessment were evaluated in the study. Materials and methods. Twenty extracted human teeth were scanned on a 2.35 T MRI system for MR microscopy using the 3D spin-echo method that enabled image acquisition with isotropic resolution of 100 m. The 3D images were then post processed by ImageJ program(NIH) to obtain advanced volume rendered views of dental pulps. Results. MR microscopy at 2.35 T provided accurate data on dental pulp anatomyin vitro. The data were presented as a sequence of thin 2D slices through the pulp in various orientations or as volume rendered 3D images reconstructed form arbitrary view-points. Sequential 2D images enabled only anapproximate assessment of the pulp, while volume rendered 3D images were more precise in visualization of pulp anatomy and clearly showed pulp diverticles, number of pulp canals and root canal anastomosis. Conclusions. This in vitro study demonstrated that MR microscopy could provide very accurate 3D visualization of dental pulp anatomy. A possible future application of the method in vivo may be of a great importance for the endodontic treatment.
Objavljeno v DiRROS: 21.03.2024; Ogledov: 57; Prenosov: 19
.pdf Celotno besedilo (1004,44 KB)

2.
Meshless simulation of a macrosegregation benchmark considering the solid motion
Viktor Govže, Igor Vušanović, Božidar Šarler, 2023, objavljeni znanstveni prispevek na konferenci

Povzetek: We have extended the existing two-dimensional rigid solid phase benchmark for binary substance with the solid phase motion in the present paper. Incompressible laminar Newtonian flow is assumed, and a standard mixture formulation is used for the mass, momentum, energy, and solute transport. A coherency solid motion model accounts for the free-floating grains, assuming that the solid velocity is proportional to the mixture velocity and the liquid fraction. The lever rule is used to describe the mass fractions of the phases. A two-dimensional benchmark is solved using the semi-implicit meshless diffuse approximate method with an adaptive subdomain upwinding strategy. The results of the meshless method are compared to the finite volume method results with a reasonable agreement. The new benchmark results show that the solid motion has an essential effect on the macrosegregation pattern.
Ključne besede: solidification, meshless methods, grain motion, benchmarks
Objavljeno v DiRROS: 21.03.2024; Ogledov: 64; Prenosov: 37
.pdf Celotno besedilo (1,11 MB)
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3.
CT colonography in detection of colorectal carcinoma
Amela Sofić, Šerif Beslić, Igor Kocijančič, Nedžad Šehović, 2010, izvirni znanstveni članek

Povzetek: Background. Diagnostic methods used in screening and detectingand 2 lipomas,and 2 lipomas, among tumours there were 55 adenocarcinomas and 1 lymphoma. Results showed CT colonography among tumours there were 55 adenocarcinomas and 1 lymphoma. Results showed CTsensitivity to polyps to be 89.7%, barium enema 48.7%, and colonoscopy 94.9%. Sensitivity to tumours of CT colonography colonography colorectal CT barium enema followed by colonoscopy wereand colonoscopy was 100% and of barium enema 94.6%. Specificities and PPV were 100% in all procedures. The performed. After thesensitivity to polyps to be 89.7%, barium enema 48.7%, andcomfort assessment showed CT colonography as the far most comfortable out of three procedures. colonoscopy 94.9%. Sensitivity to tumours of CT colonography procedures a comfort assessment was done in all colonography. The aim of thisand colonoscopy was 100% and of barium enema 94.6%. Specificities and PPV were 100% in all procedures. The study was to establish diagnostic accuracy andpatients. Diagnostic positive comfort assessment showed CT colonography as the far most comfortable out of three procedures. results were verified by the pato-histological examination. Sensitivity, specificity, positive comfort of CT colonography compared carcinoma are digitorectal examination,topredicative value (PPV) and negative predicative value (NPV) were calculated for each procedure.
Ključne besede: CT colonography, barium enema, colonoscopy, colorectal polyp, colorectal carcinoma
Objavljeno v DiRROS: 18.03.2024; Ogledov: 53; Prenosov: 20
.pdf Celotno besedilo (933,29 KB)

4.
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3T MRI in evaluation of asbestos-related thoracic diseases : preliminary results
Janez Podobnik, Igor Kocijančič, Viljem Kovač, Igor Serša, 2010, izvirni znanstveni članek

Objavljeno v DiRROS: 15.03.2024; Ogledov: 59; Prenosov: 12
.pdf Celotno besedilo (842,57 KB)

6.
CT-guided percutaneous transthoracic needle biopsy of lung lesions - 2-year experience at the Institute of radiology in Ljubljana
Igor Kocijančič, Ksenija Kocijančič, 2007, izvirni znanstveni članek

Povzetek: Background. In 1883, Leyden described percutaneous lung biopsy, but it was notuntil 1970s that image guided fine needle chest biopsy gained widespread acceptance. Haaga and Alfidi reported CT-guided thoracic biopsy in 1976. Currently, tissue sampling of a thoracic lesion is indicated when the diagnosis is not obtained by the endobronchial technique and when the cytological diagnosis will modify the stage of the disease or influence the therapeutic strategy. Cytology obtained by small-gauge needle aspiration biopsy confirms the nature of the lesion in 80 - 95% of cases and carry a low incidence of major complications according to the literature. The purpose of this retrospective analysis was to provide basic data about diagnostic accuracy and incidence of pneumothorax and chest tube insertion with respect to percutaneous transthoracic CT-guided needle biopsy of lung lesions. Methods. After positioning of the patient we performed a spiral CT of the thorax with the accordingly placed metal mark, which helped us to set the optimal cutaneous entry point. After that we re-checked the localisation of the lesion and marked the entry point with a pen and clean the surface to keepit sterile. After we applied local anaesthetic subcutaneously, we used coaxial 18G Gallini aspiration biopsy needles with cutting tip for CT- guided aspiration cytologic examination. The length of the needle was chosen according to the distance of the targeted lesion. Results. From January 2005 to January 2007 forty-three patients - 24 men and 19 women who were 26-79 years old (mean +/- SD, 59.8 +/- 10 years) were referred to the Institute of Radiology to undergo the PTNB. One patient was referred twice. Consequently, the hospital records and images of 44 consecutive cases of percutaneous transthoracic fine needle aspiration biopsy procedure were retrospectively analysed. (Abstract truncated at 2000 characters)
Objavljeno v DiRROS: 22.02.2024; Ogledov: 150; Prenosov: 33
.pdf Celotno besedilo (5,01 MB)

7.
Radiofrequency ablation of lung tumours - new perspective in treatment of lung neoplasms
Ksenija Kocijančič, Igor Kocijančič, 2007, izvirni znanstveni članek

Povzetek: Background. Percutaneous radiofrequency ablation (RFA) is a minimally invasivetechnique used to treat solid tumours. Because of its ability to produce large volume of coagulation necrosis in controlled fashion this technique has been progressively tested as a possible treatment of lung malignancies. Recent clinical studies have shown that RFA enables successful treahnent of relatively small lung malignancies with high rate of complete response and acceptable morbidity and have suggested that the technique could represent a viable alternate or complementary method for patients with non-small cell lung cancer or lung metastases of favourable histotypes who arenot candidates for surgical resection. Conclusions. Initial intenational studies as well as the clinical experience of Institute of Radiology in Clinical Center Ljubljana, although limited, indicated that RFA is mostly welltolerated by patients and also, that it can result in complete necrosis oftargeted lesion. Pneumothorax is most common procedure related complication,occurring in up to 40% of cases, with approx. half of them requiring drainage.
Objavljeno v DiRROS: 22.02.2024; Ogledov: 113; Prenosov: 24
.pdf Celotno besedilo (239,46 KB)

8.
Imaging of small amounts of pleural fluid. Part two - physiologic pleural fluid
Igor Kocijančič, 2006, pregledni znanstveni članek

Objavljeno v DiRROS: 15.02.2024; Ogledov: 101; Prenosov: 26
.pdf Celotno besedilo (148,54 KB)

9.
Imaging of small amounts of pleural fluid. Part one - small pleural effusions
Igor Kocijančič, 2005, pregledni znanstveni članek

Povzetek: Background. Small pleural effusions are not readily identified on conventionalradiographic views of the chest, but may be an important finding, sometimes leading, via thoracocentesis, to a definitive diagnosis of pleural carcinomatosis, infection or transudate. A small meniscus sign and a medial displacement of the costophrenic angle are the only subtle signs of small accumulations of fluid on posteroanterior chest X-rays. On lateral views the finding of a small meniscus sign in the posterior costophrenic angle is the sign of small pleural effusion. Conclusions. Lateral decubitus chest radiographs were used for many years for the diagnosis of small pleural effusions. In last decades ultrasonography of pleural space becomes a leading real-time method for demonstrating small pleural effusions.
Objavljeno v DiRROS: 14.02.2024; Ogledov: 98; Prenosov: 25
.pdf Celotno besedilo (2,15 MB)

10.
Sonography of pleural space in healthy pregnants - preliminary results
Igor Kocijančič, 2005, izvirni znanstveni članek

Povzetek: Background. The purpose of our study was to determine the incidence of sonographically visible normal pleural fluid finding in healthy pregnants. Methods. Chest sonography was performed in 47 pregnant volunteers, searching for pleural fluid, first leaning on the elbow and than in a sitting position. 9-12 MHz linear probe was used. If the result of the first examination was positive (at least 2 mm thick anechoic layer), we repeated the procedure with 3-6 MHz large radius convex probe. Results. The fluid layer of typical wedge-shaped appearance was visible in the pleural space of 28/47 (59.5%) pregnant volunteers, on both sides in 18/47 (38.3%) and unilaterally in 10/47 (21.2%). The mean fhickness of fluid layer (mean of positive results in both positions) was 2.86 mm (SD 1.09 mm, range from 1.8 mm to 6.4 mm). More than 3 mm thick fluid layer was easily detected with 3-6 MHz abdominal convex probe in 7/47 (15%). Conclusions. Small amounts of pleural fluid can sometimes be detected by chest sonography, and hence also by abdominal sonography, in otherwise healthy pregnants. Such a positive result, if isolated, should not be taken as a sign of occult thoracic disease.
Objavljeno v DiRROS: 14.02.2024; Ogledov: 98; Prenosov: 22
.pdf Celotno besedilo (115,49 KB)

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