Prof. Solveig Hofvind Profile

Prof. Solveig Hofvind

at Cancer Registry of Norway

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Publications (2)

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Proceedings Article | 6 July 2018 Paper

Mammographic breast density over time among women who have participated in BreastScreen Norway

Nataliia Moshina, Gunvor Wåde, Marta Roman, Sofie Sebuødegård, Solveig Hofvind

Proceedings Volume 10718, 107180C (2018) https://doi.org/10.1117/12.2317927

KEYWORDS: Breast, Breast cancer, Brain-machine interfaces, Data modeling, Mammography, Tissues, Cancer, OSLO, Medical research, Statistical analysis

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Background

We analyzed the consistency in absolute and percent density using an automated method for estimating volumetric breast density among women who attended BreastScreen Norway 2007-2015.

Material and Methods

We used information from 33,711 women aged 50-69 who underwent two to five full field digital screening examinations biennially, 2007-2015. BMI and HT-use was obtained from a self-administered questionnaire, sent together with the invitation to screening. BMI was categorized into <21.0; 21.0-24.9; ≥25.0 kg/m², while use of HT was defined as ever versus never used. An automated method estimated fibroglandular volume (cm³), breast volume (cm³) and volumetric breast density (%) for each screening examination. We applied mixed-effects linear models to estimate associations between age, fibroglandular volume, breast volume and volumetric breast density over time including data on BMI and HT.

Results

The results models indicated age to be associated with decreased fibroglandular volume and volumetric breast density, and increased breast volume. BMI <21 kg/m² was associated with higher volumetric breast density, but lower fibroglandular and breast volume. Contrary, BMI ≥25 kg/m² was associated with lower volumetric breast density and higher fibroglandular and breast volumes. Variation in volumetric breast density and fibroglandular volume within women was rather subtle: this variance did not exceed 10% for either volumetric breast density, fibroglandular volume or breast volume.

Conclusion

Automated measures of volumetric breast density and fibroglandular volume software decreased with age among women screened in BreastScreen Norway. Absolute and percent density varied with a maximum of 10% over time, from first to last screening examination.

Proceedings Article | 6 July 2018 Paper

Breast compression parameters among women imaged with full field digital mammography and breast tomosynthesis in BreastScreen Norway

G. Waade, Åsne Holen, B. Hanestad, S. Sebuødegård, N. Moshina, K. Pedersen, Hofvind

Proceedings Volume 10718, 1071802 (2018) https://doi.org/10.1117/12.2317918

KEYWORDS: Breast, Digital breast tomosynthesis, Image compression, Digital mammography, Image quality, Mammography, Digital imaging, Cancer

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Background

Breast compression is used in mammography to improve image quality and reduce radiation dose. However, the compression may lead to discomfort or pain for the women. Breast compression time is longer with digital breast tomosynthesis (DBT) than with digital mammography (DM). We aimed to explore breast compression parameters with DM and DBT.

Material and Methods

We used information from 16,832 women participating in the Tomosynthesis Trial in Bergen between January 2016 and April 2017. We compared mean values of applied compression force (N), compression pressure (kPa) and compressed breast thickness (mm) for DM and DBT, by view (craniocaudal, CC, and mediolateral-oblique, MLO). Two-sample ttests were used to test statistical significance.

Results

Number of women screened with DM or DBT were similar (DM: n= 8354 and DBT: n= 8478). Mean compression force was statistically significantly higher for DM compared to DBT (CC: 108.6 N versus 102.7 N; MLO: 122.4 N versus 120.8 N, p <0.01). Mean compression pressure was higher for DM compared to DBT for CC view (13.9 kPa versus 13.0 kPa, p<0.01), however, not for MLO view (DM and DBT: 9.7 kPa, p= 0.55). Mean compressed breast thickness did not differ statistically significantly for DM compared to DBT (CC: 58.7 mm N versus 58.6 mm, p= 0.72; MLO: 60.1 mm versus 59.9 mm, p= 0.23).

Conclusion

Radiographers applied less breast compression with DBT compared to DM. However, the observed differences were negligible. Further research should investigate the clinical implications of the differences, such as image quality.

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