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Proceedings Paper

Atlas-driven scan planning for high-resolution micro-SPECT data acquisition based on multi-view photographs: a pilot study
Author(s): Martin Baiker; Brendan Vastenhouw; Woutjan Branderhorst; Johan H. C. Reiber; Freek Beekman; Boudewijn P. F. Lelieveldt
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Paper Abstract

Highly focused Micro-SPECT scanners enable the acquisition of functional small animal data with very high-resolution. To acquire a maximum of emitted photons from a specific structure of interest and at the same time minimize the required acquisition time, typically only a small subvolume of the animal is scanned that contains the organs of interest. This Volume of Interest (VOI) can be defined manually based on photographs of the animal taken prior to SPECT scanning, for example two lateral views and a top view. In these photographs however, only the surface of the animal is visible and therefore visual estimation of the location of these organs may be difficult. In this paper, we propose a novel atlas-based technique for estimating the organ VOI for the major organs by mapping a small animal atlas to optical scout images. The user is required to outline the animal contour in one lateral view, and to mark two lateral landmarks in the top view photograph. These landmarks subsequently serve as fiducial landmarks to define a 3D Thin-Plate-Spline mapping of an anatomical mouse atlas to the photographic coordinate space. Planar projections of the mapped atlas organs on the photographs greatly facilitate the estimation of the size and position of the target organ. To validate the proposed approach, the estimated organ VOIs were compared to manually drawn organ outlines in a Micro-CT scan, which was co-registered to the scout photographs using physical landmarks. The results demonstrate a highly promising volume correspondence between the real and the estimated organ VOIs.

Paper Details

Date Published: 13 March 2009
PDF: 8 pages
Proc. SPIE 7261, Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling, 72611L (13 March 2009); doi: 10.1117/12.813516
Show Author Affiliations
Martin Baiker, Leiden Univ. Medical Ctr. (Netherlands)
Brendan Vastenhouw, Univ. Medical Ctr. Utrecht (Netherlands)
MIlabs. BV (Netherlands)
Woutjan Branderhorst, Univ. Medical Ctr. Utrecht (Netherlands)
Johan H. C. Reiber, Leiden Univ. Medical Ctr. (Netherlands)
Freek Beekman, Univ. Medical Ctr. Utrecht (Netherlands)
Delft Univ. of Technology (Netherlands)
MIlabs. BV (Netherlands)
Boudewijn P. F. Lelieveldt, Leiden Univ. Medical Ctr. (Netherlands)
Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 7261:
Medical Imaging 2009: Visualization, Image-Guided Procedures, and Modeling
Michael I. Miga; Kenneth H. Wong, Editor(s)

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