1. Image reconstruction using small-voxel size improves small lesion detection for positron emission tomographySebastijan Rep, Petra Tomše, Luka Jensterle, Leon Jarabek, Katja Zaletel, Luka Ležaič, 2022, original scientific article Abstract: Background. PET/CT imaging is widely used in oncology and provides both metabolic and anatomic information. Because of the relatively poor spatial resolution of PET, the detection of small lesions is limited. The low spatial resolution introduces the partial-volume effect (PVE) which negatively affects images both qualitatively and quantitatively. The aim of the study was to investigate the effect of small-voxel (2 mm in-line pixel size) vs. standard-voxel (4 mm in-line pixel size) reconstruction on lesion detection and image quality in a range of activity ratios. Materials and methods. The National Electrical Manufacturers Association (NEMA) body phantom and the Micro Hollow-Sphere phantom spheres were filled with a solution of [18F]fluorodeoxyglucose ([18F]FDG) in sphere-to-background ratios of 2:1, 3:1, 4:1 and 8:1. In all images reconstructed with 2 mm and 4 mm in-line pixel size the visual lesion delineation, contrast recovery coefficient (CRC) and contrast-to-noise ratio (CNR) were evaluated. Results. For smaller (≤ 13 mm) phantom spheres, significantly higher CRC and CNR using small-voxel reconstructions were found, also improving visual lesion delineation. CRC did not differ significantly for larger (≥ 17 mm) spheres using 2 mm and 4 mm in-line pixel size, but CNR was significantly lower; however, lower CNR did not affect visual lesion delineation. Conclusions. Small-voxel reconstruction consistently improves precise small lesion delineation, lesion contrast and image quality.
Keywords: PET/CT, voxel size, contrast recovery coefficient, contrast-to-noise ratio
Published in DiRROS: 24.07.2024; Views: 116; Downloads: 59
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3. Carotid artery stiffness, digital endothelial function, and coronary calcium in patients with essential thrombocytosis, free of overt atherosclerotic diseaseMatjaž Vrtovec, Ajda Anžič Drofenik, Irena Preložnik Zupan, Katja Zaletel, Aleš Blinc, 2017, original scientific article Keywords: arterial wall, functional properties, morphological properties, calcium score, Framingham risk score, myeloproliferative disease
Published in DiRROS: 31.05.2024; Views: 191; Downloads: 97
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4. Posodobljena priporočila diagnostike in zdravljenja diferenciranega raka ščitniceNikola Bešić, Alenka Grošel, Andraž Perhavec, Andrej Doma, Andreja A. Schwarzbartl-Pevec, Andreja Klevišar Ivančič, Andrej Vogrin, Barbara Vidergar-Kralj, Barbara Gazić, Barbara Perić, Blaž Krhin, Cvetka Grašič-Kuhar, Edvard Pirnat, Ivana Žagar, Jerca Blazina, Katarina Zevnik, Katica Bajuk-Studen, Katja Zaletel, Margareta Strojan Fležar, Marko Hočevar, Marko Kokalj, Marta Dremelj, Nebojša Glumac, Olga Blatnik, Simona Gaberšček, Snežana Pavlović Djokić, Ulrika Klopčič, Veronika Kloboves-Prevodnik, Zorica Čekić, 2022, professional article Keywords: rak ščitnice, diferencirani rak, zdravljenje, smernice
Published in DiRROS: 01.07.2022; Views: 1045; Downloads: 304
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5. Posodobljena priporočila diagnostike in zdravljenja diferenciranega raka ščitniceAlenka Grošel, Andraž Perhavec, Andrej Doma, Andreja A. Schwarzbartl-Pevec, Andreja Klevišar Ivančič, Andrej Vogrin, Barbara Vidergar-Kralj, Barbara Gazić, Barbara Perić, Blaž Krhin, Cvetka Grašič-Kuhar, Edvard Pirnat, Ivana Žagar, Jerca Blazina, Katica Bajuk-Studen, Katja Zaletel, Margareta Strojan Fležar, Marko Hočevar, Marko Kokalj, Marta Dremelj, Nebojša Glumac, Nikola Bešić, Olga Blatnik, Simona Gaberšček, Snežana Pavlović Djokić, Ulrika Klopčič, Veronika Kloboves-Prevodnik, Zorica Čekić, 2020, dictionary, encyclopaedia, lexicon, manual, atlas, map Keywords: rak ščitnice, diferencirani rak, zdravljenje, smernice
Published in DiRROS: 12.03.2021; Views: 1562; Downloads: 484
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6. Smernice diagnostike in zdravljenja diferenciranega raka ščitniceNikola Bešić, Andreja A. Schwarzbartl-Pevec, Andreja Klevišar Ivančič, Barbara Vidergar-Kralj, Barbara Gazić, Blaž Krhin, Branko Zakotnik, Cvetka Grašič-Kuhar, Damijan Bergant, Edvard Pirnat, Helena Gutnik, Ivana Žagar, Jerca Blazina, Katja Zaletel, Margareta Strojan Fležar, Marko Hočevar, Marta Dremelj, Nebojša Glumac, Olga Blatnik, Simona Gaberšček, Snežana Pavlović Djokić, Ulrika Klopčič, Veronika Kloboves-Prevodnik, Živa Pohar-Marinšek, 2017, dictionary, encyclopaedia, lexicon, manual, atlas, map Keywords: rak ščitnice, diferencirani rak, zdravljenje, smernice
Published in DiRROS: 27.05.2020; Views: 2141; Downloads: 690
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