Prof. Christian Bernhardsson Profile

Prof. Christian Bernhardsson

at Lund Univ

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Publications (2)

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Proceedings Article | 7 April 2023 Poster + Paper

Dose evaluation of simultaneous breast radiography and mechanical imaging

Anna Bjerkén, Hanna Tomic, Christian Bernhardsson, Sophia Zackrisson, Anders Tingberg, Magnus Dustler, Predrag Bakic

Proceedings Volume 12463, 124634D (2023) https://doi.org/10.1117/12.2655776

KEYWORDS: Digital breast tomosynthesis, Sensors, Breast, Radiography, X-rays, Mammography, Dosimetry, Plastics, Luminescence, Tomosynthesis

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This study investigates the impact in terms of radiation dose when performing simultaneous digital breast tomosynthesis (DBT) and mechanical imaging (MI) – DBTMI. DBTMI has demonstrated the potential to increase specificity of cancer detection, and reduce unnecessary biopsies, as compared to digital mammography (DM) screening. The presence of the MI sensor during simultaneous image acquisition may increase the radiation dose when automatic exposure control is used. In this project, a radiation dose study was conducted on clinically available breast imaging systems with and without the MI sensor. We have investigated three approaches to analyse the dose increase in DBTMI, using (i) the estimates of average glandular dose (AGD) reported in DICOM headers of radiography images; (ii) AGD measured by a conventional dosemeter; and (iii) AGD measured by optically stimulated luminescence using NaCl pellets. The relative increase in AGD estimated from DICOM headers when using the MI sensor was on average 10.7% and 12.4%, for DM and DBT measurements, respectively. The relative increase in AGD using the conventional dosemeter was 11.2% in DM mode and 12.2% in DBT mode. The relative increase in AGD using NaCl pellets was 14.6% in DM mode. Our measurements suggest that the use of simultaneous breast radiography and MI increases the AGD by 13% on average. The increase in dose is still below the acceptable values in mammography screening recommended by the European Guidelines.

Proceedings Article | 13 July 2022 Paper

Evaluation of 3D printed contrast detail phantoms for mammography quality assurance

Måns Boll, Trevor Vent, Hanna Tomic, Christian Bernhardsson, Magnus Dustler, Anders Tingberg, Predrag Bakic

Proceedings Volume 12286, 122860J (2022) https://doi.org/10.1117/12.2625732

KEYWORDS: 3D printing, Fused deposition modeling, Polymethylmethacrylate, Mammography

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Objects created by 3D printers are increasingly used in various medical applications. Today, affordable 3D printers, using Fused Deposition Modeling are widely available. In this project, a commercially available 3D printer was used to replicate a conventional radiographic contrast detail phantom. Printing materials were selected by comparing their x-ray attenuation properties. Two replicas were printed using polylactic acid, with different filling patterns. The printed phantoms were imaged by a clinical mammography system, using automatic exposure control. Phantom images were visually and quantitively compared to images of the corresponding conventional contrast detail phantom. Visual scoring of the contrast detail elements was performed by a medical physics student. Contrast-to-noise ratio (CNR) was calculated for each phantom element. The diameter and thickness of the smallest visible phantom object were 0.44 mm and 0.09 mm, respectively, for both filling patterns. For the conventional phantom, the diameter and thickness of the smallest visible object were 0.31 mm and 0.09 mm. Visual inspection of printed phantoms revealed some linear artefacts. These artefacts were however not visible on mammographic projections. Quantitively, average CNR of printed phantom objects followed the same trend with an increase of average CNR with increasing disk height. However, there is a limitation of detail objects with disk diameters below 1.25 mm, caused by the available nozzle size. Based upon the encouraging results, future work will explore the use of different materials and smaller nozzle diameters.

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