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Proceedings Paper

A prototype system of upright dedicated cone-beam breast CT
Author(s): Gongming Xu; Chengyijue Fang; Xiao Jiang; Lei Zhu
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Paper Abstract

Purpose: Current dedicated cone-beam breast CT (CBBCT) systems typically adopt a pendant geometry for patient comfort and mechanical compatibility with a breast biopsy device. In this work, we design and construct a prototype system of upright CBBCT with a compact size, such that mammography devices can be readily replaced in current clinical rooms. The system performance on spatial resolution, CT accuracy and field-of-view (FOV) size are evaluated via preliminary phantom studies.

Materials and Methods: The prototype system consists of a mono-block x-ray source, a flat panel detector, a slip ring for signal transmission, a servo motor and a rotating gantry. The relative positions and angles of x-ray source and detector are carefully designed to ensure a large FOV with almost zero dead space on the chest side. The slip ring is used to accommodate a breast stretching device designed to stretch the breast length to match the same imaging volume size as in a prone gesture.

Results: The designed prototype system has a size of 1950mm, 1200mm, and 660mm in height, length and width, respectively. On the Catphan®600 phantom, the acquired CBBCT images have an average CT number error of less than 0.5% and an image non-uniformity of 0.19%. An in-house water phantom with inserted thin tungsten wires is designed to evaluate the system capability on imaging small calcifications. The results show that our system successfully images small high-contrast objects with a diameter of 30 μm.

Conclusion: We have developed a prototype upright CBBCT system with a compact size, a high imaging accuracy and spatial resolution.

Paper Details

Date Published: 16 March 2020
PDF: 6 pages
Proc. SPIE 11312, Medical Imaging 2020: Physics of Medical Imaging, 1131256 (16 March 2020); doi: 10.1117/12.2541709
Show Author Affiliations
Gongming Xu, Univ. of Science and Technology of China (China)
Chengyijue Fang, Univ. of Science and Technology of China (China)
Xiao Jiang, Univ. of Science and Technology of China (China)
Lei Zhu, Univ. of Science and Technology of China (China)

Published in SPIE Proceedings Vol. 11312:
Medical Imaging 2020: Physics of Medical Imaging
Guang-Hong Chen; Hilde Bosmans, Editor(s)

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