Abstract：
:Bone density measurement by quantitative computed tomography (QCT) commonly uses an external reference phantom to decrease scan-to-scan and scanner-to-scanner variability. However, the peripheral location of these phantoms and other phantom variables is also responsible for a measurable degradation in accuracy and precision. Due to non-uniform artifacts such as beam hardening, scatter, and volume averaging, the ideal reference phantom should be as close to the target tissue as possible. This investigation developed and tested a computer program that uses paraspinal muscle and fat tissue as internal reference standards in an effort to eliminate the need for an external phantom. Because of their proximity, these internal reference tissues can be assumed to reflect more accurately the local changes in the x-ray spectra and scatter distribution at the target tissue. A user interactive computerized histogram plotting technique enabled the derivation of reproducible CT numbers for muscle, fat, and trabecular bone. Preliminary results indicate that the use of internal reference tissues with the histogram technique may improve reproducibility of scan-to-scan measurements as well as inter-scanner precision. Reproducibility studies on 165 images with intentional region-of-interest (ROI) mispositioning of 1.5, 2.5, or 3.5 mm yielded a precision of better than 1% for normals and 1% to 2% for osteoporotic patients--a twofold improvement over the precision from similar tests using the standard technique with an external reference phantom. Such improvements in precision are essential for QCT to be clinically useful as a noninvasive modality for measurement of the very small annual changes in bone mineral density.
journal_name
J Digit Imagingjournal_title
Journal of digital imagingauthors
Boden SD,Goodenough DJ,Stockham CD,Jacobs E,Dina T,Allman RMdoi
10.1007/BF03168013subject
Has Abstractpub_date
1989-02-01 00:00:00pages
31-8issue
1eissn
0897-1889issn
1618-727Xjournal_volume
2pub_type
杂志文章abstract：:Large PACS (Picture Archiving and Communication Systems) installations do not yet exist in Sweden, but some hospitals have had experience with limited PACS activities. At present there are four mini PACS installations in radiology departments and about 12 teleradiology systems in use in Sweden. A couple of small Swedi...
journal_title：Journal of digital imaging
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abstract：:Remote teleconsultation by specialists is important for timely, correct, and specialized emergency surgical and medical decision making. In this paper, we designed a new personal digital assistant (PDA)-phone-based emergency teleradiology system by combining cellular communication with Bluetooth-interfaced local wirel...
journal_title：Journal of digital imaging
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abstract：:Workflow is a widely used term to describe the sequence of steps to accomplish a task. The use of workflow technology in medicine and medical imaging in particular is limited. In this article, we describe the application of a workflow engine to improve workflow in a radiology department. We implemented a DICOM-enabled...
journal_title：Journal of digital imaging
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journal_title：Journal of digital imaging
pub_type： 杂志文章,评审
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journal_title：Journal of digital imaging
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doi：10.1007/s10278-003-1728-x
更新日期：2004-03-01 00:00:00
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journal_title：Journal of digital imaging
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更新日期：2019-04-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章,评审
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journal_title：Journal of digital imaging
pub_type： 杂志文章
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更新日期：2010-02-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章
doi：10.1007/BF03167642
更新日期：2000-05-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章
doi：10.1007/BF03167602
更新日期：1990-08-01 00:00:00
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journal_title：Journal of digital imaging
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更新日期：2014-06-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章
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更新日期：2020-02-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章
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更新日期：2000-05-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章
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更新日期：2001-03-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章
doi：10.1007/BF03168293
更新日期：1998-08-01 00:00:00
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journal_title：Journal of digital imaging
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更新日期：2009-12-01 00:00:00
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journal_title：Journal of digital imaging
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journal_title：Journal of digital imaging
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journal_title：Journal of digital imaging
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journal_title：Journal of digital imaging
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更新日期：2007-12-01 00:00:00
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journal_title：Journal of digital imaging
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更新日期：2012-02-01 00:00:00
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journal_title：Journal of digital imaging
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journal_title：Journal of digital imaging
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更新日期：1999-05-01 00:00:00
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journal_title：Journal of digital imaging
pub_type： 杂志文章,评审
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journal_title：Journal of digital imaging
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