Quantification of artifact reduction with real-time cine four-dimensional computed tomography acquisition methods

International Journal of Radiation Oncology, Biology, Physics
Ulrich Langner, Paul J Keall

Abstract

To quantify the magnitude and frequency of artifacts in simulated four-dimensional computed tomography (4D CT) images using three real-time acquisition methods- direction-dependent displacement acquisition, simultaneous displacement and phase acquisition, and simultaneous displacement and velocity acquisition- and to compare these methods with commonly used retrospective phase sorting. Image acquisition for the four 4D CT methods was simulated with different displacement and velocity tolerances for spheres with radii of 0.5 cm, 1.5 cm, and 2.5 cm, using 58 patient-measured tumors and respiratory motion traces. The magnitude and frequency of artifacts, CT doses, and acquisition times were computed for each method. The mean artifact magnitude was 50% smaller for the three real-time methods than for retrospective phase sorting. The dose was approximately 50% lower, but the acquisition time was 20% to 100% longer for the real-time methods than for retrospective phase sorting. Real-time acquisition methods can reduce the frequency and magnitude of artifacts in 4D CT images, as well as the imaging dose, but they increase the image acquisition time. The results suggest that direction-dependent displacement acquisition is the preferred...Continue Reading

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Citations

Oct 5, 2013·Medical Physics·Tokihiro YamamotoPaul J Keall
Nov 7, 2012·Medical Physics·Taeho KimPaul Keall
Jul 13, 2012·Zeitschrift für medizinische Physik·Geoffrey D Hugo, Mihaela Rosu
Sep 15, 2012·Academic Radiology·Tokihiro YamamotoPaul J Keall
Dec 18, 2010·International Journal of Radiation Oncology, Biology, Physics·Gitte Fredberg PerssonStine Sofia Korreman
Jun 24, 2015·Journal of Applied Clinical Medical Physics·Sarah J CastilloThomas Guerrero
Jun 4, 2014·Journal of Applied Clinical Medical Physics·Sarah J CastilloThomas Guerrero
May 30, 2019·Medical Physics·René WernerChristian Hofmann
Nov 21, 2012·Physics in Medicine and Biology·Stine S Korreman

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