Continuous improvement in clinical PET scanners has allowed attainment of an intrinsic spatial resolution in the range of 2 to 5 mm full-width-at-half-maximum (FWHM).1 In practice, however, this resolution usually cannot be achieved when imaging the thoracic and abdominal regions, in part because of physiologic motion. Bulk patient motion during long PET acquisition times, as well as cardiac and respiratory motion, can have a negative effect on image quality and therefore diagnostic accuracy in a high number of patients. In addition to producing blurring, motion can produce severe image artifacts caused by mismatches between the static attenuation map and the moving emission map.2 In oncology, motion affects the detectability of small lesions and the accuracy of quantitative analysis, impairing diagnosis and therapy monitoring.3 and 4 In cardiovascular imaging, severe attenuation map mismatches caused by motion may lead to the detection of false myocardial perfusion defects, as shown by Ouyang and colleagues.
Motion compensation; Respiratory motion; Cardiac motion; PET-MR imaging
Citation: Camila Munoz, Christoph Kolbitsch, Andrew J. Reader, Paul Marsden, Tobias Schaeffter, Claudia Prieto, PhD MR-Based Cardiac and Respiratory Motion-Compensation Techniques for PET-MR Imaging doi:10.1016/j.cpet.2015.09.004
Available online: 26 January 2016
Copyright: © 2016 The Authors. Published by Elsevier Inc. This is an open access articleunder the CC BY license (http://creativecommons.org/licenses/by/4.0/).