Optical geometry calibration method for free-form digital tomosynthesis

Pavel Chtcheprov; Allison Hartman; Jing Shan; Yueh Z. Lee; Otto Zhou; Jianping Lu

doi:10.1117/12.2216851

22 March 2016 Optical geometry calibration method for free-form digital tomosynthesis

Pavel Chtcheprov, Allison Hartman, Jing Shan, Yueh Z. Lee, Otto Zhou, Jianping Lu

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 978365 (2016) https://doi.org/10.1117/12.2216851
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

Digital tomosynthesis is a type of limited angle tomography that allows 3D information to be reconstructed from a set of x-ray projection images taken at various angles using an x-ray tube, a mechanical arm to rotate the tube about the object, and a digital detector. Tomosynthesis reconstruction requires the precise location of the detector with respect to each x-ray source, forcing all current clinical tomosynthesis systems to use a physically coupled source and detector so the geometry is always known and is always the same. This limits the imaging geometries and its large size is impractical for mobile or field operations. To counter this, we have developed a free form tomosynthesis with a decoupled, free-moving source and detector that uses a novel optical method for accurate and real-time geometry calibration to allow for manual, hand-held tomosynthesis and even CT imaging. We accomplish this by using a camera, attached to the source, to track the motion of the source relative to the detector. Attached to the detector is an optical pattern and the image captured by the camera is then used to determine the relative camera/pattern position and orientation by analyzing the pattern distortion and calculating the source positions for each projection, necessary for 3D reconstruction. This allows for portable imaging in the field and also as an inexpensive upgrade to existing 2D systems, such as in developing countries, to provide 3D image data. Here we report the first feasibility demonstrations of free form digital tomosynthesis systems using the method.

Citation Download Citation

Pavel Chtcheprov, Allison Hartman, Jing Shan, Yueh Z. Lee, Otto Zhou, and Jianping Lu "Optical geometry calibration method for free-form digital tomosynthesis", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978365 (22 March 2016); https://doi.org/10.1117/12.2216851

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available