RSNA 2016

Abstract Archives of the RSNA, 2016


PH107-ED-X

Can Size-Specific Dose Estimates (SSDE) be Regarded as the Preferred Dose Index for the Detectability in Lung Cancer CT Screening?

All Day Room: PH Community, Learning Center



Awards
Certificate of Merit

Yoshihisa Muramatsu, PhD, Kashiwa, Japan (Presenter) Nothing to Disclose
Keiichi Nomura, MS, Kashiwa, Japan (Abstract Co-Author) Nothing to Disclose
Keisuke Fujii, Nagoya, Japan (Abstract Co-Author) Nothing to Disclose
Michael F. McNitt-Gray, PhD, Los Angeles, CA (Abstract Co-Author) Institutional research agreement, Siemens AG Research support, Siemens AG
Masahiko Kusumoto, MD, Chuo, Japan (Abstract Co-Author) Nothing to Disclose
TEACHING POINTS

The purpose of this exhibit is: 1) To summarize the characteristic of the image quality and radiation doses at the level of apex, bifurcation and base for patients. 2) To show the differences among dose indices of CTDIvol, SSDE evaluated according to AAPM Report No. 204 and No. 220, respectively. 3) To evaluate absorbed doses at the level of apex, bifurcation and base based on Monte Carlo simulation. 4) To indicate the relationship between the absorbed doses and the dose indices from a lung cancer CT screening exam.

TABLE OF CONTENTS/OUTLINE

1. Background: Image quality (IQ) and radiation dose in low dose lung cancer screening CT (LCS)2. Effects of patient size on dose and image quality: Illustration of how IQ and the dose of CT change with image location within the chest (apex, mid-lung, base) Examples of how the size and shape of chest varies greatly within and among patients.3. Dose Descriptors in the context of LCS Illustration of differences in dose indices such as: CTDIvol which is standardized in IEC. SSDE220 reflects the size which accounts for attenuation Monte Carlo simulation-based estimates of dose Differences between SSDE220 and lung dose from Monte Carlo simulations.4. Image Quality and Dose Evaluations The role of Contrast to Noise Ratio and Image Noise Tradeoffs in dose and IQ metrics