A compact system for intraoperative specimen imaging based on edge illumination x-ray phase contrast

Havariyoun, Glafkos, Vittoria, Fabio A., Hagen, Charlotte K., Basta, Dario, Kallon, Gibril K., Endrizzi, Marco, Massimi, Lorenzo, Munro, Peter, Hawker, Sam, Smit, Bennie, Astolfo, Alberto, Larkin, Oliver J., Waltham, Richard M., Shah, Zoheb, Duffy, Stephen W., Nelan, Rachel L., Peel, Anthony, Suaris, Tamara, Jones, J. Louise, Haig, Ian G., Bate, David and Olivo, Alessandro (2019) A compact system for intraoperative specimen imaging based on edge illumination x-ray phase contrast. Physics in Medicine and Biology, 64 (23). ISSN 0031-9155

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A significant number of patients receiving breast-conserving surgery (BCS) for invasive carcinoma and ductal carcinoma in situ (DCIS) may need reoperation following tumor-positive margins from final histopathology tests. All current intraoperative margin assessment modalities have specific limitations. As a first step towards the development of a compact system for intraoperative specimen imaging based on edge illumination x-ray phase contrast, we prove that the system's dimensions can be reduced without affecting imaging performance. We analysed the variation in noise and contrast to noise ratio (CNR) with decreasing system length using the edge illumination x-ray phase contrast imaging setup. Two-(planar) and three-(computed tomography (CT)) dimensional imaging acquisitions of custom phantoms and a breast tissue specimen were made. Dedicated phase retrieval algorithms were used to separate refraction and absorption signals. A 'single-shot' retrieval method was also used, to retrieve thickness map images, due to its simple acquisition procedure and reduced acquisition times. Experimental results were compared to numerical simulations where appropriate. The relative contribution of dark noise signal in integrating detectors is significant for low photon count statistics acquisitions. Under constant exposure factors and magnification, a more compact system provides an increase in CNR. Superior CNR results were obtained for refraction and thickness map images when compared to absorption images. Results indicate that the 'single-shot' acquisition method is preferable for a compact CT intraoperative specimen scanner; it allows for shorter acquisition times and its combination of the absorption and refraction signals ultimately leads to a higher contrast. The first CT images of a breast specimen acquired with the compact system provided promising results when compared to those of the longer length system.

Item Type: Article
Additional Information: Publisher Copyright: © 2019 Institute of Physics and Engineering in Medicine.
Uncontrolled Keywords: ct phase contrast imaging,edge illumination phase contrast imaging,intraoperative imaging,phase contrast imaging,x-ray imaging,x-ray phase contrast imaging,radiological and ultrasound technology,radiology nuclear medicine and imaging ,/dk/atira/pure/subjectarea/asjc/3600/3614
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Depositing User: LivePure Connector
Date Deposited: 01 Nov 2022 14:31
Last Modified: 01 Nov 2022 14:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/89461
DOI: 10.1088/1361-6560/ab4912

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