By Mathias Prokop
This new booklet expertly fills a spot within the literature by means of providing the cutting-edge services and specifications of CT as a key diagnostic and interventional device, with exact emphasis at the function of spiral CT. you'll find an entire creation to the technical points and simple rules of photo interpretation, crucial for totally using the recent know-how and delivering “all you must comprehend” to start. The ebook is going directly to hide layout of CT scanners, sufferer training, scanning suggestions, and picture analysis.Highlights include:- directions for optimum use of CT and warding off error- advised scanning parameters that yield excessive photo caliber, key diagnostic info, and continue radiation defense- handy layout by way of organ approach and ailment entity, with CT symptoms built-in all through with different imaging modalities- complete dialogue of organ-specific pathology
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Extra resources for Spiral and Multislice Computed Tomography of the Body ( THIEME )
For this reason, more sophisticated raw data interpolation schemes have to be used. • The Cone Beam Problem Due to the nature of the x-ray beam, which arises from a small focal spot, all (T scanning relies on cone beam geometry. 22a). Only in the center of rotation are structures always captured by identical detector rows. The effect becomes more prominent the further a structure is from the isocenter (rotational axis), and the more detector rows are used (Fig. 122c). 22 b), which yields reasonable results up to four active detector rows but fails with a higher number of rows.
We suggest calling such a set of overlapping axial images a secondary raw data set, because it can serve as the basis for reconstructing images in any desired plane and any desired section thickness using simple multiplanar reformatting (MPR)functions. 4 to 1 mm. The MPR function of the scanner or a workstation can be employed to create axial sections of arbitrary thickness and with arbitrary reconstruction increments. ln addition, these sections can be anatomically adapted to compensate for improper positioning of the patient.
To distinguish between them, an asterisk is used to indicate the definition used by most manufactures for 4-slice scanners (volume pitch P*, also called sh'ce pitch or detector pitch), while P denotes the definition agreed upon internationally (lEC) and preferred by most physicists (pitch P), also called beam pitch: P=TFI(NxSCj P*~TF/SC Pitch Volume pitch While P is independent of the number of detector rows, P* increases as the number of detector rows grows. As with single-slice spiral CT, the pitch P can be increased up to 2, independent of the number of detector rows N.