| Optimization of multi-slice helical respiration-correlated CT: the effects of table speed and rotation time. | |
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MedLine Citation:
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PMID: 16306663 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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While respiration-correlated CT is gaining acceptance in clinical radiotherapy, the effect of scanning parameters on the image quality has yet to be addressed. The intent of this study was to characterize the effects of gantry rotation and table speed on various image quality characteristics in multi-slice, helical, retrospectively-gated CT images. Images of stationary and moving phantoms were obtained in helical mode on a 20-slice CT scanner. Motion was generated by a computer-controlled platform capable of moving simultaneously in two dimensions. Motion was monitored using a pressure gauge inserted inside an adjustable belt. Selected scans were retrospectively gated into ten phases based on the monitored motion. Gantry rotation speeds of 0.5 s and 1.0 s were evaluated with pitches ranging from 0.1 to 0.45. Several parameters, including calculated object volumes, trajectory (movement from peak to trough), deformation (actual volume divided by volume created with the maximum diameter of contoured object) and z-axis resolution, were used to characterize image quality. These studies indicate that for objects in the peak phase of a movement pattern that simulates breathing, retrospectively gated scans using fast gantry rotation speeds produce volume, trajectory, deformation and z-axis resolution results comparable with those of a stationary object. |
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Authors:
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Nicole M Wink; Michael F McNitt-Gray; Timothy D Solberg |
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Publication Detail:
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Type: Journal Article Date: 2005-11-23 |
Journal Detail:
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Title: Physics in medicine and biology Volume: 50 ISSN: 0031-9155 ISO Abbreviation: Phys Med Biol Publication Date: 2005 Dec |
Date Detail:
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Created Date: 2005-11-24 Completed Date: 2006-02-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401220 Medline TA: Phys Med Biol Country: England |
Other Details:
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Languages: eng Pagination: 5717-29 Citation Subset: IM |
Affiliation:
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Department of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, California, USA. nwink@mednet.ucla.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms Computer Simulation Humans Image Processing, Computer-Assisted Movement Phantoms, Imaging Pressure Radiographic Image Enhancement Rotation Software Time Factors Tomography, Spiral Computed / instrumentation*, methods* Water |
| Chemical | |
Reg. No./Substance:
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7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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