The impact of iterative reconstruction on image quality and radiation dose in thoracic and abdominal CT

Kalmár, P.; Quehenberger, Franz; Steiner, Jürgen; Lutfi, Andre; Bohlsen, Dennis; Talakić, Emina; Hassler, Eva; Schöllnast, Helmut

doi:10.1016/j.ejrad.2014.05.017

Cited by 21 publications

(12 citation statements)

References 18 publications

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“…This is most likely the result of CT3 being the only CT scanner without an iterative reconstruction technique. The difference in radiation exposure in this study is in accordance with previous studies, which reported a significant reduction of radiation exposure in CT due to the use of iterative reconstruction instead of filtered back projection [10,11]. National DRLs for CT examinations have been reported for many countries, e. g. for Ireland [2], Germany [4], the United Kingdom [12], Canada [1], Portugal [13], Switzerland [14] and the US [15].…”

supporting

confidence: 81%

Cloud-Based CT Dose Monitoring using the DICOM-Structured Report: Fully Automated Analysis in Regard to National Diagnostic Reference Levels

Boos

Meineke²,

Rubbert

et al. 2015

Fortschr Röntgenstr

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Ziel: Ziel dieser Studie war die Implementierung eines Cloud-basierten CT-Dosismonitorings basierend auf dem DICOM-Structured Report (DICOM-SR) zur automatischen Überwachung der Dosisexposition im Hinblick auf die nationalen diagnostischen Referenzwerte (DRW). Material und Methoden: Zur automatischen Erfassung und Überwachung der CT-Dosisdaten wurde eine neuartige, in Kooperation mitentwickelte Software basierend auf dem DICOM-SR eingesetzt. Der DICOM-SR aller CT-Untersuchungen unserer Einrichtung zwischen 09/2011 und 03/2015 wurde automatisch anonymisiert und an einen Cloud-Server verschickt. Die Daten wurden automatisch im Hinblick auf die Körper-region, das Patientenalter und den korrespondierenden DRW für den volumetrischen Computertomografie-Dosis-Index (CTDI vol ) sowie für das Dosis-Längen-Produkt (DLP) analysiert. Ergebnisse: Datensätze von 36 523 CT-Untersuchungen (131 527 Scanserien) von drei verschiedenen CT-Geräten und einem PET-CT wurden analysiert. Insgesamt betrug der mittlere CTDI vol 51,3 % und das mittlere DLP 52,8 % der nationalen DRW. Bezogen auf die nationalen DRW betrugen CTDI vol und DLP für die Abdomen-CT 43,8 % und 43,1 % (n = 10 590), für die Schädel-CT 66,6 % und 69,6 % (n = 16 098) und für die Thorax-CT 37,8 % and 44,0 % (n = 10 387). Insgesamt überschritten 1,9 % der CT-Untersuchungen den CTDI vol und 2,9 % der Untersuchungen das DLP der nationalen DRW. Zwischen unterschiedlichen CT-Protokollen, die dem gleichen nationalen DRW zugeordnet wurden, variierte die Strahlenexposition um bis zu 50 %. Schlussfolgerung: Das implementierte, Cloudbasierte CT-Dosismonitoring basierend auf dem DICOM-SR ermöglicht eine automatische, umfassende Benchmarkanalyse im Hinblick auf die nationalen DRW. Insgesamt betrug die DosisexposiAbstract ! Purpose: To implement automated CT dose data monitoring using the DICOM-Structured Report (DICOM-SR) in order to monitor dose-related CT data in regard to national diagnostic reference levels (DRLs). Materials and Methods: We used a novel in-house co-developed software tool based on the DICOM-SR to automatically monitor dose-related data from CT examinations. The DICOM-SR for each CT examination performed between 09/2011 and 03/2015 was automatically anonymized and sent from the CT scanners to a cloud server. Data was automatically analyzed in accordance with body region, patient age and corresponding DRL for volumetric computed tomography dose index (CTDI vol ) and dose length product (DLP). Results: Data of 36 523 examinations (131 527 scan series) performed on three different CT scanners and one PET/CT were analyzed. The overall mean CTDI vol and DLP were 51.3 % and 52.8 % of the national DRLs, respectively. CTDI vol and DLP reached 43.8 % and 43.1 % for abdominal CT (n = 10 590), 66.6 % and 69.6 % for cranial CT (n = 16 098) and 37.8 % and 44.0 % for chest CT (n = 10 387) of the compared national DRLs, respectively. Overall, the CTDI vol exceeded national DRLs in 1.9 % of the examinations, while the DLP exceeded national DRLs in 2.9 % of the examinations. Betw...

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supporting

confidence: 81%

Cloud-Based CT Dose Monitoring using the DICOM-Structured Report: Fully Automated Analysis in Regard to National Diagnostic Reference Levels

Boos

Meineke²,

Rubbert

et al. 2015

Fortschr Röntgenstr

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“…As previously reported (6)(7)(8)(9)13,14,16,18,19,(21)(22)(23)(26)(27)(28)(29), IR algorithms enable a lower radiation dose for body CT acquisitions while preserving image quality. An evaluation of the 50% dose CT protocol by our four readers confirmed these findings, as diagnostic confidence was maintained and the subjective image quality of the reduced-dose images was still above average when compared to the reference, 100% dose images.…”

Section: Discussionmentioning

confidence: 59%

“…The potential for dose reduction using IR while preserving image quality has already been the subject of several publications (8,11,(13)(14)(15)(16)(17), but only a few studies have analyzed both chest and abdominal CT images (10,(18)(19)(20)(21)(22)(23)(24) and none have focused on young patients. As young patients represent the most radiosensitive population (25), they most urgently require an optimized radiation exposure, especially when they frequently undergo CT examinations, such as for follow-up of oncological disease.…”

Section: Introductionmentioning

confidence: 99%

Iterative Reconstructions in Reduced-Dose CT

et al. 2017

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“…Iterative reconstruction techniques are more and more commonly applied in clinical practice. Often a dose reduction is reported when switching to these techniques [51]. Since effect of iterative reconstruction on (automated) image analysis is not yet known, it is recommended to store a second reconstruction using filtered back-projection aside from the iterative reconstruction kernel.…”

Section: Iterative Reconstruction Techniquesmentioning

confidence: 99%

Multicentre chest computed tomography standardisation in children and adolescents with cystic fibrosis: the way forward

et al. 2016

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Progressive cystic fibrosis (CF) lung disease is the main cause of mortality in CF patients. CF lung disease starts in early childhood. With current standards of care, respiratory function remains largely normal in children and more sensitive outcome measures are needed to monitor early CF lung disease. Chest CT is currently the most sensitive imaging modality to monitor pulmonary structural changes in children and adolescents with CF. To quantify structural lung disease reliably among multiple centres, standardisation of chest CT protocols is needed. SCIFI CF (Standardised Chest Imaging Framework for Interventions and Personalised Medicine in CF) was founded to characterise chest CT image quality and radiation doses among 16 participating European CF centres in 10 different countries. We aimed to optimise CT protocols in children and adolescents among several CF centres. A large variety was found in CT protocols, image quality and radiation dose usage among the centres. However, the performance of all CT scanners was found to be very similar, when taking spatial resolution and radiation dose into account. We conclude that multicentre standardisation of chest CT in children and adolescents with CF can be achieved for future clinical trials.

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The impact of iterative reconstruction on image quality and radiation dose in thoracic and abdominal CT

Cited by 21 publications

References 18 publications

Cloud-Based CT Dose Monitoring using the DICOM-Structured Report: Fully Automated Analysis in Regard to National Diagnostic Reference Levels

Cloud-Based CT Dose Monitoring using the DICOM-Structured Report: Fully Automated Analysis in Regard to National Diagnostic Reference Levels

Iterative Reconstructions in Reduced-Dose CT

Multicentre chest computed tomography standardisation in children and adolescents with cystic fibrosis: the way forward

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