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 no longer stood nonetheless whereas others have thrived. Advances in CT have persisted apace with different modalities that have taken CT into new parts of imaging that quite a few brief years in the past it can no longer process. With the arrival of 64-slice CT, a better variety of pictures will be taken in a far speedier time period. using CT perfusion within the mind and stomach are reviewed during this factor. leading edge ideas akin to 4D CT and twin power CT might be mentioned, in addition to CT purposes for imaging of the coronary arteries and cardiac valves.
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Additional info for Advances in MDCT, An Issue of Radiologic Clinics
Longitudinal (z) mA modulation Longitudinal (z) mA modulation addresses the varying attenuation of the patient among anatomic regions by varying the mA along the z axis of the patient (eg, shoulders versus the abdomen), as shown in Fig. 2. The operator must therefore provide as input to the algorithm the desired level of image quality, the paradigms for which are at present relatively manufacturer-specific. Fig. 2. Graph of relative tube current superimposed on a CT projection radiograph illustrates the concept of longitudinal dose modulation.
D) Mixed-kV image created using sigmoidal blending of the output of the two images showing marked improvement in the appearance of the liver parenchyma while preserving the improved contrast in the tumor and small hepatic arteries. control can be used, but it should be realized that for larger patients, the image quality of the 80-kV tube may be compromised because the system tube currents will be exceeded and the system is not able to provide sufficient radiation dose as desired. Similar considerations apply when acquiring dual-energy CT data with other hardware platforms.
3). Automatic exposure Fig. 3. Dual-energy CT acquisition protocols can be constructed so there is no increase in radiation dose. 23 mGy. 79 mGy and improved image contrast using the dual-energy technique. The tube current of the 80-kV tube was chosen to be roughly four times that of the 140-kV tube (D). Tube currents are chosen at dual-energy CT so that the images created are dose-matched compared with single-source CT acquisition protocols (by adding the CTDIvol of both tubes) and roughly noise matching the images at the two energies.
Advances in MDCT, An Issue of Radiologic Clinics by Vahid Yaghmai MD, Dushyant V Sahani MD