Nelly Salem MD, Presenter: Nothing to Disclose

Kuan-Hao Dylan Su, Abstract Co-Author: Nothing to Disclose

Lingzhi Hu PhD, Abstract Co-Author: Employee, Koninklijke Philips NV

Peter F. Faulhaber MD, Abstract Co-Author: Speaker, Koninklijke Philips NV Grant, Koninklijke Philips NV Medical Advisor, MIM Software Inc

Donna M. Plecha MD, Abstract Co-Author: Advisory Board, Hologic, Inc Research Grant, SuperSonic Imagine

Raymond Muzic PhD, Abstract Co-Author: Research Grant, Koninklijke Philips NV

1. Alert readers to review attenuation maps to check for truncation artifacts. 2. Explain derivation of a PET attenuation map by using segmentation. 3. To desribe a method for mitigating truncation artifacts.

Introduction: PET/MR offers many advantages to breast cancer patients. A pitfall in PET/MR breast scans is truncation artifact. With prone breast imaging, the MR signal intensity in the arms or the back could be reduced or missed due to the inhomogeneity of the magnetic field. The low or missing signal may result in severe underestimation of the Standard Uptake Value (SUV), directly affecting diagnosis. Purpose: To mitigate image artifacts, optimize diagnostic accuracy of PET/MR scans and reduce SUV error due to truncation utilizing a truncation compensation algorithm. Proper review of the attenuation correction map is crucial for identification of truncation artifact. Truncation Compensation Algorithm: We investigated a new truncation compensation method that uses time-of-flight-based non-attenuation corrected PET images to find the edge of the body and fills the body out to this edge assuming the attenuation coefficient of soft tissue (Blaffert et al., Proc SPIE, Medical Imaging 2012, Vol 8314). Conclusion: Application of this truncation compensation method allows reliable truncation compensation.

http://abstract.rsna.org/uploads/2014/14011420/14011420_p8nm.pdf

Salem, N, Su, K, Hu, L, Faulhaber, P, Plecha, D, Muzic, R, Truncation Compensation in Prone PET/MR Breast Scans.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14011420.html