Document Detail

Improvement of image quality in megavoltage computed tomography with second generation scanning mode.
MedLine Citation:
PMID:  9372549     Owner:  NLM     Status:  MEDLINE    
Megavoltage computed tomographic (CT) scanning is a topic of interest in precision radiation therapy. It is useful in verifying and improving the accuracy of the patient's positioning. For this purpose, we developed a third generation mode megavoltage CT scanner. However, insufficient spatial resolution limits its clinical usefulness. A second generation mode megavoltage scanner using a turntable has been newly developed to investigate whether improvements in spatial sampling could result in image quality high enough for clinical use. Scanning is composed of 11 rotations and 12 translations of the table. The scanning beam is a 3 MV X-ray, and the detector consists of 75 elements of cadmium tungstate crystals combined with photodiodes. A spatial resolution of 0.5 mm and contrast resolution of approximately 5% were obtained. The image quality is inferior to that of conventional diagnostic CT scanners, but is estimated to be adequate for some clinical applications of radiation therapy. Based on the satisfactory results, a new third generation megavoltage CT scanner is under investigation.
K Nakagawa; Y Aoki; Y Sasaki
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Radiation oncology investigations     Volume:  5     ISSN:  1065-7541     ISO Abbreviation:  Radiat Oncol Investig     Publication Date:  1997  
Date Detail:
Created Date:  1997-12-23     Completed Date:  1997-12-23     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9437448     Medline TA:  Radiat Oncol Investig     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  257-63     Citation Subset:  IM    
Department of Radiology, Faculty of Medicine, University of Tokyo, Japan.
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MeSH Terms
Image Enhancement
Phantoms, Imaging
Radiotherapy Planning, Computer-Assisted
Radiotherapy, High-Energy / methods
Tomography, X-Ray Computed / instrumentation*,  methods

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