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Technical Brief

Interlandmark Measurements From Lodox Statscan Images1

[+] Author and Article Information
Chipo Chimhundu, Sudesh Sivarasu, Tania S. Douglas

Biomedical Engineering Programme and MRC/UCT
Medical Imaging Research Unit,
University of Cape Town,
Cape Town 7701, South Africa

Julian Smit

Division of Geomatics,
University of Cape Town,
Cape Town 7701, South Africa

Accepted and presented at the Design of Medical Devices Conference (DMD2014), Minneapolis, MN, April 7–10, 2014.

Manuscript received February 21, 2014; final manuscript received March 3, 2014; published online July 21, 2014. Editor: Arthur G. Erdman.

J. Med. Devices 8(3), 030908 (Jul 21, 2014) (3 pages) Paper No: MED-14-1108; doi: 10.1115/1.4027102 History: Received February 21, 2014; Revised March 03, 2014

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References

Abdel-Aziz, Y., and Karara, H., 1971, “Direct Linear Transformation From Comparator Coordinates Into Object Space Coordinates in Close-Range Photogrammetry,” ASP Symposium on Close-Range Photogrammetry, Urbana, IL, January 26–29, pp. 1–18.
Adams, L. P., 1981, “X-Ray Stereo Photogrammetry Locating the Precise, Three-Dimensional Position of Image Points,” Med. Biol. Eng. Comput., 19(5), pp. 569–578. [CrossRef] [PubMed]
Van Geems, B., 1996, “The Use of Multiple Surviews of a Computed Tomography Scanner to Determine the 3D Coordinates of External Cranial Markers,” Int. Arch. Photogramm. Remote Sens., 31, pp. 576–580.
Douglas, T., Vaughan, C., and Wynne, S., 2004, “Three-Dimensional Point Localisation in Low-Dose X-Ray Images Using Stereo-Photogrammetry,” Med. Bio. Eng. Comput., 42(1), pp. 37–43. [CrossRef]
Kärrholm, J., 1989, “Roentgen Stereophotogrammetry: Review of Orthopedic Applications,” Acta Orthop., 60(4), pp. 491–503. [CrossRef]
Jerbi, T., Burdin, V., Stindel, E., and Roux, C., 2009, “Registration of Low Dose Bi-Planar Acquisitions for Motion Analysis,” Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2009), Minneapolis, MN, September 3–6, pp. 90–93. [CrossRef]
Jerbi, T., Burdin, V., Stindel, E., and Roux, C., 2011, “A 2D 3D Registration With Low Dose Radiographic System for In Vivo Kinematic Studies,” Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2011), Boston, MA, August 30–September 3, pp. 8070–8073. [CrossRef]
Seehaus, F., Olender, G. D., Kaptein, B. L., Ostermeier, S., and Hurschler, C., 2012, “Markerless Roentgen Stereophotogrammetric Analysis for In Vivo Implant Migration Measurement Using Three Dimensional Surface Models to Represent Bone,” J. Biomech., 45(8), pp. 1540–1545. [CrossRef] [PubMed]

Figures

Grahic Jump Location
Fig. 1

Lodox statscan imaging system; A = X-ray source that produces a collimated fan beam; B = C-arm; C = X-ray detector unit, which consists of scintillator arrays that are linked to charge-coupled-devices (the unit captures X-rays from A); Y = scan direction (along the trolley length). The C-arm travels along the table length taking a series of line scans using time delayed integration to produce a single continuous image.

Grahic Jump Location
Fig. 2

550 mm × 500 mm × 8 mm perspex frame embedded with eight 5 mm diameter steel ball bearings in general position (numbered)—used as a calibration tool

Grahic Jump Location
Fig. 3

Calibration procedure—M1 and M2 are collinear points separated by a vertical distance D and imaged from two different perspectives using an axially rotated X-ray source. S1 = source at viewpoint 1 and S2 = source at viewpoint 2.

Grahic Jump Location
Fig. 4

Anteroposterior (left) and oblique lateral image (right) of the pelvis used for ILD and ILA measurement

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