Holger Haubenreisser, Presenter: Nothing to Disclose

Mathias Meyer, Abstract Co-Author: Nothing to Disclose

Sonja Sudarski MD, Abstract Co-Author: Nothing to Disclose

Stefan Oswald Schoenberg MD, PhD, Abstract Co-Author: Institutional research agreement, Siemens AG

Thomas Henzler MD, Abstract Co-Author: Nothing to Disclose

To prospectively investigate image quality and radiation dose of 100 kV spectral shaping chest CT using a dedicated tin filter on a 3rd generation DSCT in comparison to standard 100 kV chest CT.

Sixty patients that were referred for a non-contrast chest CT were prospectively included in this study and examined at 100kV with a dedicated tin filter behind the x-ray tube for spectral shaping. These patients were retrospectively matched with patients that were examined on a 2nd generation DSCT at 100kV without tin filter. All images were reconstructed using iterative reconstruction techniques (ADMIRE, SAFIRE; Siemens). Objective and subjective image quality was assessed in various anatomic regions and radiation dose was compared between the two groups.

Radiation dose was decreased by 90% using the 100 kV tin protocol when compared to 100 kV without tin filtration (mean dose 3.0±1.2 vs. 0.32±0.12 mSv). Soft tissue attenuation and soft tissue image noise was not statistically different for both examination techniques (p>0.05). Attenuation of air was lower for examinations performed with spectral shaping, while image noise was higher (p0.05).

100 kV spectral shaping chest CT by means of a tube based tin filter allows 90% dose reduction when compared to 100 kV chest CT without spectral shaping. Thus, this CT protocol may be ideal for lung cancer screening.

Our study demonstrates the feasibility and dose reduction of spectral shaping at a tube voltage of 100kV for non-contrast enhanced chest CT,allowing this protocol to be used for lung cancer screening.

Haubenreisser, H, Meyer, M, Sudarski, S, Schoenberg, S, Henzler, T, Unenhanced Chest CT at 100kV with Spectral Shaping: A Potential New Sub-millisievert Lung Cancer Screening Protocol.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14004431.html