{"id":28375,"date":"2019-11-20T10:32:47","date_gmt":"2019-11-20T07:32:47","guid":{"rendered":"http:\/\/ihcoedu.uobaghdad.edu.iq\/?p=28375"},"modified":"2019-11-21T13:22:26","modified_gmt":"2019-11-21T10:22:26","slug":"%d9%82%d8%b3%d9%85-%d8%a7%d9%84%d9%81%d9%8a%d8%b2%d9%8a%d8%a7%d8%a1-%d9%8a%d9%86%d8%a7%d9%82%d8%b4-%d8%a7%d8%b7%d8%b1%d9%88%d8%ad%d8%a9-%d8%af%d9%83%d8%aa%d9%88%d8%b1%d8%a7%d9%87-%d8%aa%d8%a8%d8%ad-3","status":"publish","type":"post","link":"https:\/\/ihcoedu.uobaghdad.edu.iq\/?p=28375","title":{"rendered":"\u0642\u0633\u0645 \u0627\u0644\u0641\u064a\u0632\u064a\u0627\u0621 \u064a\u0646\u0627\u0642\u0634 \u0627\u0637\u0631\u0648\u062d\u0629 \u062f\u0643\u062a\u0648\u0631\u0627\u0647 \u062a\u0628\u062d\u062b \u0641\u064a \u0627\u0646\u0634\u0627\u0621 \u0635\u0648\u0631 \u062b\u0644\u0627\u062b\u064a\u0629 \u0627\u0644\u0627\u0628\u0639\u0627\u062f \u0628\u0627\u0644\u062a\u0635\u0648\u064a\u0631 \u0627\u0644\u0645\u0642\u0637\u0639\u064a"},"content":{"rendered":"

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    \n<\/li>\n<\/ol>\n

    3D image Tomography<\/span><\/h3>\n

    By Hawra’a Hadi Jiad<\/span><\/h3>\n

    Supervised by Hameed Majeed Abduljabar<\/span><\/h3>\n

    Abstract<\/span><\/h3>\n

    Due to the possibility of CT to produce images of the internal structure for the different objects without the need to damage the object, for this reason, new horizons have been opened researchers for this technique<\/span><\/h3>\n

    This work is concerned with developing a model for reconstructing images from its projections by three methods<\/span><\/h3>\n

    The first method is used the 2D Radon transform to generate a 2D projection for each slice of the 3D object at different heights. The 2D Back-Projection (2D BP) and the Fourier Slice Theorem methods (FST) are used to reconstruct each 2D projection slice of the 3D object. The results showed the capability of the FST to reconstruct the external and the internal structure of it. Beside that the Fourier Slice Theorem could not remove all blurring artifact, so, this research, is suggest threshold technique to eliminate the excessive points due to the blurring artifact ,while the 2D BP, which has the capability to reconstruction the external structure of the object and its inability to reconstruction the internal structure of it because of the blurring artifact, so, this research, suggested the Ramp filter in frequency domain to eliminate the blurring artifact and it successful to remove the blurring artifact and retrieve the internal structure.<\/span><\/h3>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 The second method has used the 3D Radon Transform to generate a3D projection for the 3D object. The 3D Back-Projection (3D BP) is used to reconstruct the 3D object, the 3D BP, which was capable to reconstruction the external structure of the object and in able to reconstruction the internal structure because of the blurring artifact, so, this research, suggested the Ramp filter in the frequency domain to eliminate the blurring artifact but cannot remove the blurring artifact and retrieve the internal structure\u00a0<\/span><\/h3>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 The third method has used the X-ray projections for a 3D object to generate the 4D projections. The central section theorem for the X-ray projection and the 3D Back Projections for X-ray Projection are used to retrieved 3D object from 4D projection. The central section theorem therefore was fielded to retrieve object while the 3D Back Projection is successful to retrieve the external structure but inability to retrieve the internal structure of it because of the blurring artifact, so, this research, suggested the Ramp filter in the frequency domain to eliminate the blurring artifact although it cannot remove the blurring artifact and retrieve the internal structure.\u00a0<\/span><\/h3>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Also in this dissertation suggest three types of interpolation to reduce the dose of radiation to the patient and the time to reconstruct object are the nearest neighbor interpolation, linear interpolation, and non-linear interpolation applied on 2D sinogram that taken at angular difference greater than one degree. Two reconstruction methods are adopted in this study the back-projection method and Fourier slice theorem method, from the results the second reconstruction proven to be a promising reconstruction with the linear interpolation method when the<\/span> angular difference is less than 20o<\/span><\/h3>\n

    <\/h4>\n","protected":false},"excerpt":{"rendered":"

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