CT_Reconstruction[1] - '"eorv of Image Reconstruction in...

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Cwnputd '"eorv of Image Reconstruction in Computed ~~nog ~ ~omography ' Rodney A. Brooks, Ph-ZT., and Gllovannl DE CWo, M.D. Mathematleal melhbds arn ol cenlral knportance In the new fsehnoms of radbyaphk and radialsotopic image reconstruction. The most iKnparlanl prOcadueS are classifkd as Back-projec!ion, iterative, and analylicsl (Twodiinslonal Fowk, Fmered Back-projec lian). Back-projection pbyd an Jrnpmant historical role $ut is no WQer used bBCBustt of sizable artifacts. Ana!ylical mWs excel h speed and accuacy wbn a large number of projections are available and are exlensivwrj wsd In x-ray imaging. herativs rbcon- struclim is me attractive wkn the nmh of views la fimlted, H mwse K slgniiicant. an4 If addirional faclws, a.g. . gammaqay attenuation. sre present. Fw these reaarms, hers- tlve methods are wldaty used in radioisotope rrnaglng. mX TERMS: camp Radiology 117:56 7-5 YOMOGRAM is, literally. a picture of a sib, A ie. . a display of an anatomical plane sectioning the body at a given orientation. The use of converttianal radiographic tomography (1-31 is now widespread, while conventional radioisotopic tomography (4-6) has encountered less acceptance. The ideal goal, common to both modalities. is the elimination, by more or less ef- ficient blurring, of layers outside the focused phne (Fig. 1, A). Under no circumstances. however, can this elimi- nation be total. Reconstructive tomography (RT), also known as computed tomography (CP) or computer assisted (axial) tomography (CAT), is a new type of body-layer visual- ization, either radiographic OK radioisotoplc, whkh aC lows for complete exclusion of sections not under study (Fig. 1, B). In this rnethdology the detected radiations pass through or originate from the desired anammicar plane without entering other areas (Cig. 2). Projections of the radiations detected at multiple angles are used to reconstruct the anatomical layer, usually with the aid of a computer. R Is obvious that, although radiologists may be unfamiliar with the mathematical methods involved in the reconstruction, some effwt must be made to com- prehend the basic principles and undertying concepts. %'&G) DETECTOR Flg. 1.
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This note was uploaded on 02/27/2008 for the course BME 525 taught by Professor Singh during the Fall '07 term at USC.

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CT_Reconstruction[1] - '"eorv of Image Reconstruction in...

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