Extra patient movement during mammographic imaging: an experimental study

Ma, WK, Brettle, D, Howard, D, Kelly, J, Millington, S and Hogg, P 'Extra patient movement during mammographic imaging: an experimental study' , British Journal of Radiology .

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Objective: To determine if movement external to the patient occurring during mammography may be a source of image blur. Methods: Four mammography machines with seven flexible and nine fixed paddles were evaluated. In the first stage, movement at the paddle was measured mechanically using two calibrated linear potentiometers. A deformable breast phantom was used to mimic a female breast. For each paddle, themovement inmillimetres and change in compression force in Newton was recorded at 0.5- and 1-s intervals, respectively, for 40s with the phantom in an initially compressed state under a load of 80N. In the second stage, clinical audit on 28 females was conducted on one mammography machine with the 18324- and 24329-cm flexible paddles. Results: Movement at the paddle followed an exponential decay with a settling period of approximately 40s. The compression force readings for both fixed and flexible paddles decreased exponentially with time, while fixed paddles have a larger drop in compression force than flexible paddles. There is a linear relationship between movement at the paddle and change in compression force. Conclusion: Movement measured at the paddle during an exposure can be represented by a second order system. The amount of extra patient movement during the actual exposure can be estimated using the linear relationship between movement at the paddle and the change in compression force. Advances in knowledge: This research provides a possible explanation to mammography image blurring caused by extra patient movement and proposes a theoretical model to analyse the movement.

Item Type: Article
Themes: Health and Wellbeing
Schools: Schools > School of Health Sciences > Centre for Health Sciences Research
Journal or Publication Title: British Journal of Radiology
Publisher: British Institute of Radiology
Refereed: Yes
ISSN: 0007-1285
Related URLs:
Funders: Non funded research
Depositing User: P Hogg
Date Deposited: 07 Nov 2014 18:42
Last Modified: 25 Jan 2016 11:00
URI: http://usir.salford.ac.uk/id/eprint/33017

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