Document Detail

Prospects and challenges of rendering tissue density in Hounsfield units for cone beam computed tomography.
MedLine Citation:
PMID:  23768878     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVES: Limitations in rendering of tissue density in Hounsfield units (HUs) for cone beam computed tomography (CBCT) are described and illustrated using a phantom and two CBCT systems to demonstrate grayscale measurement variability.
MATERIALS AND METHODS: The basis of the HU scale, its correlation with measured computed tomography (CT) numbers, and the limitations in the accuracy of such correlation due to artifacts are discussed. Rendering of tissue densities based on HU values of two CBCT systems [NewTom VGi and Hyperion X9, respectively large and small field of view (FOV)] are measured using a phantom.
RESULTS: Data produced from small FOV CBCT acquisition are generally less affected by artifacts compared with large FOV CBCT.
CONCLUSIONS: Artifacts challenge the accurate conversion of density values into HUs. Care should be taken when interpreting quantitative density measurements obtained with CBCT. With more advanced software and methods, it may be possible to improve the consistency and accuracy of density measurements.
Roberto Molteni
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Oral surgery, oral medicine, oral pathology and oral radiology     Volume:  116     ISSN:  2212-4411     ISO Abbreviation:  Oral Surg Oral Med Oral Pathol Oral Radiol     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-06-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101576782     Medline TA:  Oral Surg Oral Med Oral Pathol Oral Radiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  105-19     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2013 Elsevier Inc. All rights reserved.
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