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© 2006. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Image quality of CT scans suffers when objects undergo motion. Respiratory motion causes artifacts, which prevents adequate visualization of anatomy. Four‐dimensional CT (4D‐CT) is a method in which image reconstruction of moving objects is retrospectively gated according to the recorded phase information of the monitored motion pattern. Although several groups have investigated the use of 4D‐CT in radiotherapy, little has been detailed with regard to the sorting method. We present a new retrospective gating technique with sorting based on the amplitude of the motion trace. This method is compared to previously developed methods that sort based on phase. A 16‐slice CT scanner (Sensation 16, Siemens Medical Solutions, Erlangen, Germany) was used to acquire images of two phantoms on a motion platform moving in two dimensions. The motion was monitored using a strain gauge inserted inside an adjustable belt. A 180° interpolation was used for reconstruction after gating. Significant improvement using the amplitude‐sorting technique was observed, particularly when testing nonperiodic motion functions.

PACS numbers: 87.59.Fm, 87.53.Kn, 87.57.Ce

Details

Title
Phase versus amplitude sorting of 4D‐CT data
Author
Wink, Nicole M 1 ; Panknin, Christoph 2 ; Solberg, Timothy D 3 

 Department of Radiation Oncology, David Geffen School of Medicine at University of California, Los Angeles, California, U.S.A. 
 Siemens AG, Medical Solutions, Erlangen, Germany 
 Department of Radiation Oncology, David Geffen School of Medicine at University of California, Los Angeles, California, U.S.A.; Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, Nebraska, U.S.A. 
Pages
77-85
Section
Medical Imaging
Publication year
2006
Publication date
Dec 2006
Publisher
John Wiley & Sons, Inc.
e-ISSN
15269914
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2289828803
Copyright
© 2006. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.