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001-es BibID:BIBFORM103519
035-os BibID:(cikkazonosító)51 (Wos)000842252400001 (Scopus)85136101100
Első szerző:Mathies, Franziska
Cím:Multiple-pinhole collimators improve intra- and between-rater agreement and the certainty of the visual interpretation in dopamine transporter SPECT / Mathies Franziska, Apostolova Ivayla, Dierck Lena, Jacobi Janin, Kuen Katja, Sauer Markus, Schenk Michael, Klutmann Susanne, Forgács Attila, Buchert Ralph
Dátum:2022
ISSN:2191-219X
Megjegyzések:Background: Multiple-pinhole (MPH) collimators improve the resolution-sensitivity trade-off compared to parallel-hole collimators. This study evaluated the impact of MPH collimators on intra- and between-rater agreement, and on the certainty of visual interpretation in dopamine transporter (DAT)-SPECT. Methods: The study included 71 patients (62.1 ? 12.7 y). Two SPECT acquisitions were performed in randomized order after a single injection of 182 ? 9 MBq 123I-FP-CIT, one with MPH and one with low-energy-high-resolution-high-sensitivity (LEHRHS) collimators. MPH projections were reconstructed with an iterative 3d Monte Carlo algorithm. LEHRHS projections were reconstructed with filtered backprojection (FBP) or with ordered-subsets expectation-maximization and resolution recovery (OSEM). Images were visually evaluated twice by three independent raters with respect to presence/absence of Parkinson-typical reduction of striatal 123I-FP-CIT uptake using a Likert 6-score (- 3 = clearly normal, ?, 3 = clearly reduced). In case of intra-rater discrepancy, an intra-rater consensus was obtained. Intra- and between-rater agreement with respect to the Likert score (6-score and dichotomized score) was characterized by Cohen's kappa. Results: Intra-rater kappa of visual scoring of MPH/LEHRHS-OSEM/LEHRHS-FBP images was 0.84 ? 0.12/0.73 ? 0.06/0.73 ? 0.08 (6-score, mean of three raters) and 1.00 ? 0.00/0.96 ? 0.04/0.97 ? 0.03 (dichotomized score). Between-rater kappa of visual scoring (intra-rater consensus) of MPH/LEHRHS-OSEM/LEHRHS-FBP images was 0.70 ? 0.06/0.63 ? 0.08/0.48 ? 0.05 (6-score, mean of three pairs of raters) and 1.00 ? 0.00/0.92 ? 0.04/0.90 ? 0.06 (dichotomized score). There was a decrease of (negative) Likert scores in normal DAT-SPECT by 0.87 ? 0.18 points from the LEHRHS-OSEM to the MPH setting. The (positive) Likert scores of reduced DAT-SPECT did not change on average. Conclusions: MPH collimators improve intra- and between-rater agreement as well as the certainty of the visual interpretation of DAT-SPECT.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:EJNMMI Research. - 12 : 1 (2022), p. 1-11. -
További szerzők:Apostolova, Iva Dierck, Lena Jacobi, Janin Kuen, Katja Sauer, Markus Schenk, Michael Klutmann, Susanne Forgács Attila (1985-) (fizikus) Buchert, Ralph
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Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:BIBFORM095804
Első szerző:Opposits Gábor (fizikus, szoftver fejlesztő)
Cím:Automated procedure assessing the accuracy of HRCT-PET registration applied in functional virtual bronchoscopy / Gábor Opposits, Marianna Nagy, Zoltán Barta, Csaba Aranyi, Dániel Szabó, Attila Makai, Imre Varga, László Galuska, Lajos Trón, László Balkay, Miklós Emri
Dátum:2021
ISSN:2191-219X
Megjegyzések:Background: Bronchoscopy serves as direct visualisation of the airway. Virtual bronchoscopy provides similar visual information using a non-invasive imaging procedure(s). Early and accurate image-guided diagnosis requires the possible highest performance, which might be approximated by combining anatomical and functional imaging. This communication describes an advanced functional virtual bronchoscopic (fVB) method based on the registration of PET images to high-resolution diagnostic CT images instead of low-dose CT images of lower resolution obtained from PET/CT scans. PET/CT and diagnostic CT data were collected from 22 oncological patients to develop a computer-aided high-precision fVB. Registration of segmented images was performed using elastix. Results: For virtual bronchoscopy, we used an in-house developed segmentation method. The quality of low- and high-dose CT image registrations was characterised by expert's scoring the spatial distance of manually paired corresponding points and by eight voxel intensity-based (dis)similarity parameters. The distribution of (dis)similarity parameter correlating best with anatomic scoring was bootstrapped, and 95% confidence intervals were calculated separately for acceptable and insufficient registrations. We showed that mutual information (MI) of the eight investigated (dis)similarity parameters displayed the closest correlation with the anatomy-based distance metrics used to characterise the quality of image registrations. The 95% confidence intervals of the bootstrapped MI distribution were [0.15, 0.22] and [0.28, 0.37] for insufficient and acceptable registrations, respectively. In case of any new patient, a calculated MI value of registered low- and high-dose CT image pair within the [0.28, 0.37] or the [0.15, 0.22] interval would suggest acceptance or rejection, respectively, serving as an aid for the radiologist. Conclusion: A computer-aided solution was proposed in order to reduce reliance on radiologist's contribution for the approval of acceptable image registrations.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Computed tomography
Diagnostics
Image registration
Image segmentation
Image-guided bronchoscopy
Megjelenés:EJNMMI Research. - 11 : 1 (2021), p. 1-13. -
További szerzők:Nagy Marianna (1987-) (orvosdiagnosztikai képalkotó) Barta Zoltán (1974-) (nukleáris medicina szakorvos) Aranyi Sándor Csaba (1988-) (programtervező informatikus) Szabó Dániel (1986-) (gépészmérnök) Makai Attila (1987-) (tüdőgyógyász szakorvos) Varga Imre (1960-) (tüdőgyógyász) Galuska László (1946-) (belgyógyász, izotópdiagnoszta) Trón Lajos (1941-) (biofizikus) Balkay László (1963-) (biofizikus) Emri Miklós (1962-) (fizikus)
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Intézményi repozitóriumban (DEA) tárolt változat
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