Mr. Daisuke Notohara Profile

Daisuke Notohara

at Shimadzu Corp

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Proceedings Article | 17 March 2011 Paper

An approach of long-view tomosynthesis in peripheral arterial angiographic examinations

Daisuke Notohara, Kazuyoshi Nishino, Koichi Shibata

Proceedings Volume 7961, 79615M (2011) https://doi.org/10.1117/12.877922

KEYWORDS: Angiography, X-ray imaging, X-rays, Blood vessels, Sensors, Arteries, Reconstruction algorithms, Tomography, Tungsten, Lung cancer

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Tomosynthesis (TS) has been evaluated as a useful diagnostic imaging tool for the orthopedic market and lung cancer screening. Previously, we proposed Long-View Tomosynthesis (LVTS) to apply further clinical application by expanding the reconstructed region of TS. LVTS method consists of three steps. First, it acquires multiple images while X-ray tube and Flat Panel Detector (FPD) are moving in the same linear direction simultaneously at a constant speed. Second, each image is divided into fixed length strips, and then the strips from different images having similar X-ray beam trajectory angles are stitched together. Last, multi slice coronal images are reconstructed by utilizing the Filtered Back Projection (FBP) technique from the long stitched images. The present LVTS method requires the acquisition by the constant speed motion to stitch each strip precisely. It is necessary to improve the LVTS method to apply peripheral angiographic examinations that are usually acquired at arbitrary variable speeds to chase the contrast media in the blood vessel. We propose adding the method of detecting the moved distance of frames along with anatomical structure and the method of selecting pixel values with contrast media to stitching algorithm. As a result, LVTS can extract new clinical information like 3-D structure of superficial femoral arteries and the entire blood vessel from images already acquired by routine bolus chasing techniques.

Proceedings Article | 13 March 2009 Paper

First physical measurements and clinical evaluation for long-view tomosynthesis

Daisuke Notohara, Kazuyoshi Nishino, Koichi Shibata

Proceedings Volume 7258, 72581K (2009) https://doi.org/10.1117/12.810007

KEYWORDS: X-rays, X-ray imaging, Spatial resolution, Sensors, CT reconstruction, Reconstruction algorithms, Imaging systems, Image filtering, X-ray computed tomography, Tomography

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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.

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