Filip Šroubek1, Michal Bartoš2, Jan Schier2, Zuzana Bílková2, Barbara Zitová2, Jan Vydra3, Iva Macová4, Jan Daneš4, Lukáš Lambert4. 1. Institute of Information Theory and Automation, Czech Academy of Sciences, 182 08, Prague 8, Czech Republic. sroubekf@utia.cas.cz. 2. Institute of Information Theory and Automation, Czech Academy of Sciences, 182 08, Prague 8, Czech Republic. 3. Medico Ltd, Prague, Czech Republic. 4. Department of Radiology, First Faculty of Medicine, Charles University and General University Hospital in Prague, 128 08, Prague 2, Czech Republic.
Abstract
PURPOSE: Breast ultrasonography (US) presents an alternative to mammography in young asymptomatic individuals and a complementary examination in screening of women with dense breasts. Handheld US is the standard-of-care, yet when used in whole-breast examination, no effort has been devoted to monitoring breast coverage and missed regions, which is the purpose of this study. METHODS: We introduce a computer-aided system assisting radiologists and US technologists in covering the whole breast with minimum alteration to the standard workflow. The proposed system comprises a standard US device, proprietary electromagnetic 3D tracking technology and software that combines US visual and tracking data to estimate a probe trajectory, total time spent in different breast segments, and a map of missed regions. A case study, which involved four radiologists (two junior and two senior) performing whole-breast ultrasound in 75 asymptomatic patients, was conducted to test the importance and relevance of the system. RESULTS: The mean process time per breast was [Formula: see text], with no statistically significant difference between the left and the right sides, and slightly longer examination time of junior radiologists. The process time density shows that central parts of the breast have better coverage compared to the periphery. Within the central part, missed regions of minimum detectable size of [Formula: see text] occur in [Formula: see text] of examinations, and non-negligible [Formula: see text] regions occur in [Formula: see text] of cases. CONCLUSION: The results of the case study indicate that missed regions are present in handheld whole-breast US, which renders the proposed system for tracking the probe position during examination a valuable tool for monitoring coverage.
PURPOSE: Breast ultrasonography (US) presents an alternative to mammography in young asymptomatic individuals and a complementary examination in screening of women with dense breasts. Handheld US is the standard-of-care, yet when used in whole-breast examination, no effort has been devoted to monitoring breast coverage and missed regions, which is the purpose of this study. METHODS: We introduce a computer-aided system assisting radiologists and US technologists in covering the whole breast with minimum alteration to the standard workflow. The proposed system comprises a standard US device, proprietary electromagnetic 3D tracking technology and software that combines US visual and tracking data to estimate a probe trajectory, total time spent in different breast segments, and a map of missed regions. A case study, which involved four radiologists (two junior and two senior) performing whole-breast ultrasound in 75 asymptomatic patients, was conducted to test the importance and relevance of the system. RESULTS: The mean process time per breast was [Formula: see text], with no statistically significant difference between the left and the right sides, and slightly longer examination time of junior radiologists. The process time density shows that central parts of the breast have better coverage compared to the periphery. Within the central part, missed regions of minimum detectable size of [Formula: see text] occur in [Formula: see text] of examinations, and non-negligible [Formula: see text] regions occur in [Formula: see text] of cases. CONCLUSION: The results of the case study indicate that missed regions are present in handheld whole-breast US, which renders the proposed system for tracking the probe position during examination a valuable tool for monitoring coverage.
Authors: Oliver Zettinig; Benjamin Frisch; Salvatore Virga; Marco Esposito; Anna Rienmüller; Bernhard Meyer; Christoph Hennersperger; Yu-Mi Ryang; Nassir Navab Journal: Int J Comput Assist Radiol Surg Date: 2017-02-24 Impact factor: 2.924
Authors: Wendie A Berg; Andriy I Bandos; Ellen B Mendelson; Daniel Lehrer; Roberta A Jong; Etta D Pisano Journal: J Natl Cancer Inst Date: 2015-12-28 Impact factor: 13.506
Authors: Eric D Larson; Won-Mean Lee; Marilyn A Roubidoux; Mitchel M Goodsitt; Chris Lashbrook; Fouzaan Zafar; Oliver D Kripfgans; Kai Thomenius; Paul L Carson Journal: Ultrasound Med Biol Date: 2016-06-03 Impact factor: 2.998