Michael Robert Bruesewitz, Presenter: Nothing to Disclose

Lifeng Yu PhD, Abstract Co-Author: Nothing to Disclose

Shuai Leng PhD, Abstract Co-Author: Nothing to Disclose

Thomas J. Vrieze RT, Abstract Co-Author: Nothing to Disclose

Joel Garland Fletcher MD, Abstract Co-Author: Grant, Siemens AG

Cynthia H. McCollough PhD, Abstract Co-Author: Research Grant, Siemens AG

1) To illustrate the benefits of spectral shaping in single- and dual-energy CT 2) To show how deconvolution and iterative reconstruction (IR) can be used to produce images that are thinner than a detector width along the z axis 3) To describe the use of dynamically controlled focal spot shaping to limit the effects of focal spot blooming as tube current and potential are increased 4) To demonstrate the clinical impact of improved x,y, and z spatial resolution

CONTENT ORGANIZATION 1.Spectral Shaping in single- and dual-energy CT a. Principles b. Clinical applications 2.Slice Thickness Shaping a. Principles b. Clinical applications 3. Focal Spot Shaping a. Focal spot blooming b. Dynamic focal spot shaping to combat focal spot blooming c. Benefits in low-kV and dual-energy clinical protocols CONCLUSION/SUMMARY 1) Increased tube current capabilities enable aggressive filtration of x-ray spectra, resulting in clinically important noise and contrast-to-noise ratio improvements a) 50% reduction in dose for lung screening b) Increased sensitivity of material decomposition techniques. 2) With z axis deconvolution and IR, slice widths narrower than the detector width are possible 3) Dynamic focal spot shaping provides constant levels of spatial resolution across all tube currents and potentials

http://abstract.rsna.org/uploads/2014/14018821/14018821_4w5f.pdf

Bruesewitz, M, Yu, L, Leng, S, Vrieze, T, Fletcher, J, McCollough, C, Spectral, Slice Thickness and Focal Spot Shaping in CT Imaging: How Do They Work and What Can They Do?.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14018821.html