تكفون ابي حل لهذه الاسئله في اسرع وقت ممكن ؟؟؟؟

[alrha]

لسلام عليكم شباب ابي منك طلاب الي يعرف يحل الاسئله هذي لأن عندي اختبار بعد ثلاث ايام ظرووووووري تكفون ياشباب الله يسعدكم انا مبتعثه خارج الوطن وتكفون حلوها لي الله يعافيكم الي يقدر بالانجليزي طبعا وجزاكم الله الف خير




a-What is an degradation modeL .

b- why is an image degradation model useful.

c-what are the two main degradation components of the model.

d- Explain briefly how the model may be used to "reverse" the degradation



تكفون ياشباب في اسرع وقت ممكن

[farok]

First introduction to the topic

In an X-ray computed tomography (CT), time to scan an object must be allowed to obtain its projection data. If the object is not steady during the scanning, its reconstructed image would contain errors called motion artifacts. Recently, two kinds of motion artifact, blurred image and stroboscopic image, have been found in clinical experience, and their theoretical analyses have been demanded. Assuming that an object is a rigid body, its motion can be divided into rotary and parallel motions.
This paper analyzes the degradation of reconstructed images and artifacts due to the rotary motion of a rigid object. The degradation of a CT image caused by rotation of an arbitrarily shaped rigid object is formulated by using a point-spread function. The characteristics of blurred images of a rigid object due to its rotation in a CT and the shape of blurred images also are analyzed. The cause of stroboscopic images is explained by using line sources. The theories have been confirmed by computer simulation.

[farok]

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