M Jadidi1, A Sundin2,3, P Aspelin4,5, M Båth6,7, S Nyrén8,9. 1. 1 Departments of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden. 2. 2 Radiology Department, Uppsala University Hospital, Uppsala, Sweden. 3. 3 Radiology, Oncology and Radiation Science, Uppsala University, Uppsala, Sweden. 4. 4 Departments of Clinical Science, Intervention and Technology, Karolinska University Hospital, Stockholm, Sweden. 5. 5 Radiology Department, Karolinska University Hospital, Stockholm, Sweden. 6. 6 Department of Radiation Physics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. 7. 7 Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, Gothenburg, Sweden. 8. 8 Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden. 9. 9 Radiology Department, Karolinska Institute, Stockholm, Sweden.
Abstract
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 vendor-recommended protocol [12-s acquisition time, source-to-image distance (SID) 180 cm] as reference, and the area under the VGC curve (AUCVGC) 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 AUCVGC 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.
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 vendor-recommended protocol [12-s acquisition time, source-to-image distance (SID) 180 cm] as reference, and the area under the VGC curve (AUCVGC) 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 AUCVGC 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.
Authors: Christina Söderman; Åse A Johnsson; Jenny Vikgren; Rauni R Norrlund; David Molnar; Angelica Svalkvist; Lars G Månsson; Magnus Båth Journal: Acad Radiol Date: 2015-01-15 Impact factor: 3.173
Authors: Christina Söderman; Sara Asplund; Åse Allansdotter Johnsson; Jenny Vikgren; Rauni Rossi Norrlund; David Molnar; Angelica Svalkvist; Lars Gunnar Månsson; Magnus Båth Journal: Med Phys Date: 2015-03 Impact factor: 4.071
Authors: Sara A Asplund; Åse A Johnsson; Jenny Vikgren; Angelica Svalkvist; Agneta Flinck; Marianne Boijsen; Valeria A Fisichella; Lars Gunnar Månsson; Magnus Båth Journal: Eur Radiol Date: 2014-05-04 Impact factor: 5.315
Authors: Anouk M Speets; Yolanda van der Graaf; Arno W Hoes; Sandra Kalmijn; Alfred Pe Sachs; Matthieu Jcm Rutten; Jan Willem C Gratama; Alexander D Montauban van Swijndregt; Willem Pthm Mali Journal: Br J Gen Pract Date: 2006-08 Impact factor: 5.386