Abstract:
RATIONALE AND OBJECTIVES:The impact of varying image acquisition parameters on the precision of measurements using quantitative computed tomography is currently based on studies performed before the advent of helical image acquisition and multidetector-row scanners. The aim of this study was to evaluate helical multidetector-row quantitative computed tomography to determine the factors contributing to the overall precision of measurements on quantitative computed tomography conducted using current vintage computed tomographic (CT) scanners. MATERIALS AND METHODS:The effects of CT protocol parameters (x-ray tube voltage and current, pitch, gantry rotation speed, detector configuration, table height, and reconstruction algorithm) and short-term scanner variation were examined on two commercially available quantitative CT (QCT) systems (ie, a combination of reference phantoms and analysis software) using seven multidetector-row CT scanners (available from a single vendor) operated in helical mode. Combined with simulated patient repositioning using three ex vivo spine specimens, precision (coefficient of variation) estimates were made on the basis of three scenarios: "best case," "routine case," and "worst case." RESULTS:The overall best-case QCT precision was 1.4%, provided that no changes were permitted to the bone mineral density (BMD) scan protocol. Routine-case examination (with a BMD reference phantom in place) that permitted some variation in the x-ray tube current and table speed produced a precision of 1.8%. Without any constraints on the clinical QCT examinations, the worst-case precision was estimated at 3.6%. CONCLUSIONS:Although small in appearance, these errors are for single time points and may increase substantially when monitoring changes through QCT measurements over several time points. This calls for increased caution and attention to detail whenever using helical multidetector-row quantitative computed tomography for the assessment of BMD change.
journal_name
Acad Radioljournal_title
Academic radiologyauthors
Bligh M,Bidaut L,White RA,Murphy WA Jr,Stevens DM,Cody DDdoi
10.1016/j.acra.2008.08.007subject
Has Abstractpub_date
2009-02-01 00:00:00pages
150-9issue
2eissn
1076-6332issn
1878-4046pii
S1076-6332(08)00499-6journal_volume
16pub_type
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journal_title:Academic radiology
pub_type: 杂志文章
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更新日期:1995-01-01 00:00:00
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journal_title:Academic radiology
pub_type: 杂志文章,评审
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pub_type: 杂志文章
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journal_title:Academic radiology
pub_type: 杂志文章
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journal_title:Academic radiology
pub_type: 杂志文章,评审
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pub_type: 临床试验,杂志文章
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journal_title:Academic radiology
pub_type: 杂志文章
doi:10.1016/j.acra.2011.02.018
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journal_title:Academic radiology
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doi:10.1016/j.acra.2013.03.011
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journal_title:Academic radiology
pub_type: 杂志文章
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journal_title:Academic radiology
pub_type: 杂志文章,评审
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journal_title:Academic radiology
pub_type: 杂志文章
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更新日期:1996-05-01 00:00:00
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pub_type: 杂志文章
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