Download Advances in MDCT, An Issue of Radiologic Clinics by Vahid Yaghmai MD, Dushyant V Sahani MD PDF

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By Vahid Yaghmai MD, Dushyant V Sahani MD

Regardless of technical advances utilizing MR and the emergence of puppy imaging, CT remains to be an often used imaging modality that has now not stood nonetheless whereas others have thrived. Advances in CT have persevered apace with different modalities that have taken CT into new components of imaging that quite a few brief years in the past it may well now not process. With the appearance of 64-slice CT, a better variety of photos should be taken in a far faster time period. using CT perfusion within the mind and stomach are reviewed during this factor. innovative suggestions reminiscent of 4D CT and twin power CT could be mentioned, in addition to CT purposes for imaging of the coronary arteries and cardiac valves.

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The operator must still indicate the desired level of image quality by one of the following methods. This results in the most comprehensive approach to CT dose reduction because the x-ray dose is adjusted according to the patient attenuation in all three dimensions. Automatic exposure control Overview It is technologically possible for CT systems to adjust the x-ray tube current in real time in response to variations in x-ray intensity at the detector,36,47–49 much as fluoroscopic x-ray systems adjust exposure automatically.

Graph of relative tube current superimposed on a CT projection radiograph illustrates the concept of longitudinal dose modulation. The prescribed tube current curve is determined by using attenuation data from the CT projection radiograph and a manufacturer-specific algorithm (From McCollough CH, Bruesewitz MR, Kofler JM Jr. CT dose reduction and dose management tools: overview of available options. Radiographics 2006;26(2):506; with permission). Angular and longitudinal (x,y,z) mA modulation Angular and longitudinal (x,y,z) mA modulation combines the previous two methods to vary the mA during rotation and along the z axis of the patient.

Statistical reconstruction for x-ray computed tomography using energy-integrating detectors. Phys Med Biol 2007; 52(8):2247–66. 56. Thibault JB, Sauer KD, Bouman CA, et al. A three-dimensional statistical approach to improved image quality for multislice helical CT. Med Phys 2007; 34(11):4526–44. 57. Candes EJ, Romberg J, Tao T. Robust uncertainty principles: exact signal reconstruction from highly incomplete frequency information. IEEE Trans Inf Theory 2006;52(2):489–509. 58. Sidky EY, Kao CM, Pan XH.

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