Abstract

The reference scan method is a simple yet powerful method for measuring spatial drift of the x-ray spot during a low-cone-angle μ-CT experiment. As long as the drift is smooth, and occurring on a time scale that is long compared to the acquisition time of each projection, this method provides a way to compensate for the drift by applying 2D in-plane translations to the radiographs. Here we show that this compensation may be extended to the regime of high-magnification, high-cone-angle CT experiments where source drift perpendicular to the detector plane can cause significant magnification changes throughout the acquisition.

© 2011 Optical Society of America

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References

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  1. F. Natterer, The Mathematics of Computerized Tomography (Society for Industrial and Applied Mathematics, Philadelphia, 2001).
  2. A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
    [CrossRef]
  3. A. Sasov, X. Liu, and P. L. Salmon, Proc. SPIE 7078, 70781C-1 (2008).
  4. T. Varslot, A. Kingston, G. Myers, and A. Sheppard, Med. Phys. 38, 5459 (2011).
    [CrossRef]

2011

A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
[CrossRef]

T. Varslot, A. Kingston, G. Myers, and A. Sheppard, Med. Phys. 38, 5459 (2011).
[CrossRef]

2008

A. Sasov, X. Liu, and P. L. Salmon, Proc. SPIE 7078, 70781C-1 (2008).

Kingston, A.

A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
[CrossRef]

T. Varslot, A. Kingston, G. Myers, and A. Sheppard, Med. Phys. 38, 5459 (2011).
[CrossRef]

Liu, X.

A. Sasov, X. Liu, and P. L. Salmon, Proc. SPIE 7078, 70781C-1 (2008).

Myers, G.

A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
[CrossRef]

T. Varslot, A. Kingston, G. Myers, and A. Sheppard, Med. Phys. 38, 5459 (2011).
[CrossRef]

Natterer, F.

F. Natterer, The Mathematics of Computerized Tomography (Society for Industrial and Applied Mathematics, Philadelphia, 2001).

Sakellariou, A.

A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
[CrossRef]

Salmon, P. L.

A. Sasov, X. Liu, and P. L. Salmon, Proc. SPIE 7078, 70781C-1 (2008).

Sasov, A.

A. Sasov, X. Liu, and P. L. Salmon, Proc. SPIE 7078, 70781C-1 (2008).

Sheppard, A.

A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
[CrossRef]

T. Varslot, A. Kingston, G. Myers, and A. Sheppard, Med. Phys. 38, 5459 (2011).
[CrossRef]

Varslot, T.

A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
[CrossRef]

T. Varslot, A. Kingston, G. Myers, and A. Sheppard, Med. Phys. 38, 5459 (2011).
[CrossRef]

Med. Phys.

A. Kingston, A. Sakellariou, T. Varslot, G. Myers, and A. Sheppard, Med. Phys. 38, 4934 (2011).
[CrossRef]

T. Varslot, A. Kingston, G. Myers, and A. Sheppard, Med. Phys. 38, 5459 (2011).
[CrossRef]

Proc. SPIE

A. Sasov, X. Liu, and P. L. Salmon, Proc. SPIE 7078, 70781C-1 (2008).

Other

F. Natterer, The Mathematics of Computerized Tomography (Society for Industrial and Applied Mathematics, Philadelphia, 2001).

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Figures (3)

Fig. 1.
Fig. 1.

Source drift has components parallel to (left) and perpendicular to (right) the detector plane.

Fig. 2.
Fig. 2.

Tomogram of a dolomitic limestone. Left: uncorrected. Middle: correction using the reference scan method. Right: corrected using the extended reference scan method. We note significant streaks and double edges in the left and middle image.

Fig. 3.
Fig. 3.

Graphs showing the magnification drift (calculated using the extended reference scan method), and horizontal drift (calculated using both the extended and original reference scan; 1 pixel at detector1.7μm source drift) over the course of a 2880 radiograph CT imaging run.

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