Image quality dependency on system configuration and tube voltage in chest tomosynthesis—A visual grading study using an anthropomorphic chest phantom

Söderman, Christina; Asplund, Sara; Johnsson, Åse A.; Vikgren, Jenny; Norrlund, Rauni Rossi; Molnár, Dávid; Svalkvist, Angelica; Månsson, Lars Gunnar; Båth, Magnus

doi:10.1118/1.4907963

Cited by 24 publications

(13 citation statements)

References 63 publications

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“…Table 4 shows that all protocols with a swing angle ,20°resulted in a significantly lower rating than the reference protocol (swing angle 27°) for this class of criteria and that the smaller the swing angle, the lower the AUC VGC . This result agrees well with Söderman et al 33 who reported that for a criterion related to the possibility to follow vessels through the volume all protocols with a swing angle ,20°r esulted in a lower image quality than their reference (swing angle 30°). For the demarcation class of criteria, on the other hand, no strong dependency on the swing angle was seen in the present study.…”

Section: Discussionsupporting

confidence: 82%

“…In chest DTS, a projection image density of two (images per degree) has been recommended, as the ribs (being significant high-contrast structures) may be at a considerable distance from certain reconstructed planes, 4 especially for larger patients. Söderman et al 33 who performed a study similar to the present study (an evaluation of image quality based on the reproduction of an anthropomorphic chest phantom at different acquisition protocols) on the GE chest DTS system reported an increase in image artefacts with decreasing projection image density. This was especially evident for projection image densities ,1 (projection image densities down to 0.5 were investigated).…”

Section: Discussionmentioning

confidence: 74%

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Evaluation of a new system for chest tomosynthesis: aspects of image quality of different protocols determined using an anthropomorphic phantom

Jadidi

Sundín

Aspelin

et al. 2015

BJR

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Cite this article as: Jadidi M, Sundin A, Aspelin P, Båth M, Nyrén S. Evaluation of a new system for chest tomosynthesis: aspects of image quality of different protocols determined using an anthropomorphic phantom. Objective: To compare the image quality obtained with the different protocols in a new chest digital tomosynthesis (DTS) system. Methods: A chest phantom was imaged with chest X-ray equipment with DTS. 10 protocols were used, and for each protocol, nine acquisitions were performed. Four observers visually rated the quality of the reconstructed section images according to pre-defined quality criteria in four different classes. The data were analysed with visual grading characteristics (VGC) analysis, using the vendorrecommended protocol [12-s acquisition time, source-toimage distance (SID) 180 cm] as reference, and the area under the VGC curve (AUC VGC ) was determined for each protocol and class of criteria.Results: Protocols with a smaller swing angle resulted in a lower image quality for the classes of criteria "disturbance" and "homogeneity in nodule" but a higher image quality for the class "structure". The class "demarcation" showed little dependency on the swing angle. All protocols but one (6.3 s, SID 130 cm) obtained an AUC VGC significantly ,0.5 (indicating lower quality than reference) for at least one class of criteria. Conclusion:The study indicates that the DTS protocol with 6.3 s yields image quality similar to that obtained with the vendor-recommended protocol (12 s) but with the clinically important advantage for patients with respiratory impairment of a shorter acquisition time. Advances in knowledge:The study demonstrates that the image quality may be strongly affected by the choice of protocol and that the vendor-recommended protocol may not be optimal.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 74%

Evaluation of a new system for chest tomosynthesis: aspects of image quality of different protocols determined using an anthropomorphic phantom

Jadidi

Sundín

Aspelin

et al. 2015

BJR

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“…The tube voltage was 120 kV. These acquisition parameters have been found optimal for chest tomosynthesis ( 24 ) .…”

Section: Methodsmentioning

confidence: 99%

Visibility of Structures of Relevance for Patients With Cystic Fibrosis in Chest Tomosynthesis: Influence of Anatomical Location and Observer Experience

Meltzer

Båth

Kheddache

et al. 2016

Radiat Prot Dosimetry

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The aims of this study were to assess the visibility of pulmonary structures in patients with cystic fibrosis (CF) in digital tomosynthesis (DTS) using computed tomography (CT) as reference and to investigate the dependency on anatomical location and observer experience. Anatomical structures in predefined regions of CT images from 21 patients were identified. Three observers with different levels of experience rated the visibility of the structures in DTS by performing a head-to-head comparison with visibility in CT. Visibility of the structures in DTS was reported as equal to CT in 34 %, inferior in 52 % and superior in 14 % of the ratings. Central and peripheral lateral structures received higher visibility ratings compared with peripheral structures anteriorly, posteriorly and surrounding the diaphragm (p ≤ 0.001). Reported visibility was significantly higher for the most experienced observer (p ≤ 0.01). The results indicate that minor pathology can be difficult to visualise with DTS depending on location and observer experience. Central and peripheral lateral structures are generally well depicted.

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“…Sixty projection radiographs were acquired within an angular range of §158 relative to the standard posteroanterior projection at a tube voltage of 120 kVp. These are the default settings for a chest tomosynthesis examination with this system and previous studies have shown that these settings result in adequate image quality (25,26). The scan time for the acquisition of the 60 projection images is 10 seconds.…”

Section: Image Collectionmentioning

confidence: 99%

Detection of Pulmonary Nodule Growth with Chest Tomosynthesis: A Human Observer Study Using Simulated Nodules

et al. 2019

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Image quality dependency on system configuration and tube voltage in chest tomosynthesis—A visual grading study using an anthropomorphic chest phantom

Cited by 24 publications

References 63 publications

Evaluation of a new system for chest tomosynthesis: aspects of image quality of different protocols determined using an anthropomorphic phantom

Evaluation of a new system for chest tomosynthesis: aspects of image quality of different protocols determined using an anthropomorphic phantom

Visibility of Structures of Relevance for Patients With Cystic Fibrosis in Chest Tomosynthesis: Influence of Anatomical Location and Observer Experience

Detection of Pulmonary Nodule Growth with Chest Tomosynthesis: A Human Observer Study Using Simulated Nodules

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