First physical measurements and clinical evaluation for long-view tomosynthesis

Daisuke Notohara; Kazuyoshi Nishino; Koichi Shibata

doi:10.1117/12.810007

13 March 2009 First physical measurements and clinical evaluation for long-view tomosynthesis

Daisuke Notohara, Kazuyoshi Nishino, Koichi Shibata

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72581K (2009) https://doi.org/10.1117/12.810007
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Recently, Tomosynthesis (TS) has been evaluated as a useful diagnostic imaging examination for the breast, the lung and orthopedics. However the size of the reconstructed region is limited by the mechanical acquisition motion of the X-ray tube and image detector so it is not possible to generate long view images for the spinal columns or the lower limbs examinations. Long-View Tomosynthesis (LVTS) method uses a different acquisition motion and post processing algorithm but results in a similar high resolution image slice free of anatomy above and below slice of interest. This method consists of three steps. First, acquire multi images while X-ray tube and Flat Panel Detector (FPD) are moving continuously in same linear direction. Then each image is divided into strips and strips from different images having similar X-ray beam trajectory are stitched together. Then multi slice coronal images are reconstructed from the long stitched images using filtered backprojection technique (FBP) which is similar to reconstruction algorithms used with Computed Tomography (CT) and TS. As a result, LVTS has 1.6 cycle/mm spatial resolution and 432[mm] × 800[mm] image size at a maximum. We conclude that LVTS improves depiction of long view tomograms, which can not be acquired by TS. Like TS, LVTS can produce images for weight bearing or partial weight bearing anatomy that is not possible with CT since LVTS has been integrated onto a tilting table.

Citation Download Citation

Daisuke Notohara, Kazuyoshi Nishino, and Koichi Shibata "First physical measurements and clinical evaluation for long-view tomosynthesis", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72581K (13 March 2009); https://doi.org/10.1117/12.810007

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