4D-CT and 4D-PET imaging.

Abstract

<p>The respiratory cycle was divided into 10 phases based on motion amplitude. The 10 respiratory phases were labeled T5%, T15%, … T95%, with the T5% phase corresponding approximately to the normal end-inspiration and T55% to the end-expiration for both CT and PET. 4D-CT was used for attenuation correction of 4D-PET on a phase-by-phase basis so that they would match each other spatially.</p