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Long-term in-vitro precision of direct digital X-ray radiogrammetry.

Dhainaut A, Hoff M, Kälvesten J, Lydersen S, Forslind K, Haugeberg G - Skeletal Radiol. (2011)

Bottom Line: The in-vitro longitudinal precision for the four radiographic systems ranged from 0.22 to 0.43% expressed as coefficient of variation (CV%).The smallest detectable difference (SDD) ranged from 0.0034 to 0.0054 g/cm(2).The in vitro long-term precision for direct DXR was comparable to the previous reported short-term in-vitro precision for all tested X-ray systems.

View Article: PubMed Central - PubMed

Affiliation: INM, Rheumatology, Norwegian University of Science and Technology, MTS, 7489 Trondheim, Norway. alvilde.dhainaut@ntnu.no

ABSTRACT

Objective: Digital X-ray radiogrammetry (DXR) calculates peripheral bone mineral density (BMD) from hand radiographs. The short-term precision for direct DXR has been reported to be highly satisfactory. However, long-term precision for this method has not been examined. Thus, the aim of this study was to examine the long-term in-vitro precision for the new direct digital version of DXR.

Materials and methods: The in-vitro precision for direct DXR was tested with cadaver phantoms on four different X-ray systems at baseline, 3 months, 6 months, and in one machine also at 12 months. At each time point, 31 measurements were performed.

Results: The in-vitro longitudinal precision for the four radiographic systems ranged from 0.22 to 0.43% expressed as coefficient of variation (CV%). The smallest detectable difference (SDD) ranged from 0.0034 to 0.0054 g/cm(2).

Conclusions: The in vitro long-term precision for direct DXR was comparable to the previous reported short-term in-vitro precision for all tested X-ray systems. These data show that DXR is a stable method for detecting small changes in bone density during 6-12 months of follow-up.

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Cadaver phantom bone mineral density (BMD) values in four tested X-ray systems. Measurements at baseline, 3 months, and 6 months and for FujiXG (Kristiansand) also at 12 months (box-and-whisker plot: the marked line shows the median, and the bottom and top of the box show the lower and upper quartiles. Circles represent single observations outside the range of the whiskers
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Fig1: Cadaver phantom bone mineral density (BMD) values in four tested X-ray systems. Measurements at baseline, 3 months, and 6 months and for FujiXG (Kristiansand) also at 12 months (box-and-whisker plot: the marked line shows the median, and the bottom and top of the box show the lower and upper quartiles. Circles represent single observations outside the range of the whiskers

Mentions: The CV%long term ranged from 0.22 to 0.43%. The precision data for Fuji FCR XG1 system in Kristiansand remained stable also over the 12-month period: CV% 0.35 and SDD 0.0046 g/cm2 both after 6 months and 12 months. Among the four systems, those systems with higher resolution resulted in better long-term precision expressed as lower CV% ( Table 1 and Fig. 1).Fig. 1


Long-term in-vitro precision of direct digital X-ray radiogrammetry.

Dhainaut A, Hoff M, Kälvesten J, Lydersen S, Forslind K, Haugeberg G - Skeletal Radiol. (2011)

Cadaver phantom bone mineral density (BMD) values in four tested X-ray systems. Measurements at baseline, 3 months, and 6 months and for FujiXG (Kristiansand) also at 12 months (box-and-whisker plot: the marked line shows the median, and the bottom and top of the box show the lower and upper quartiles. Circles represent single observations outside the range of the whiskers
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3198192&req=5

Fig1: Cadaver phantom bone mineral density (BMD) values in four tested X-ray systems. Measurements at baseline, 3 months, and 6 months and for FujiXG (Kristiansand) also at 12 months (box-and-whisker plot: the marked line shows the median, and the bottom and top of the box show the lower and upper quartiles. Circles represent single observations outside the range of the whiskers
Mentions: The CV%long term ranged from 0.22 to 0.43%. The precision data for Fuji FCR XG1 system in Kristiansand remained stable also over the 12-month period: CV% 0.35 and SDD 0.0046 g/cm2 both after 6 months and 12 months. Among the four systems, those systems with higher resolution resulted in better long-term precision expressed as lower CV% ( Table 1 and Fig. 1).Fig. 1

Bottom Line: The in-vitro longitudinal precision for the four radiographic systems ranged from 0.22 to 0.43% expressed as coefficient of variation (CV%).The smallest detectable difference (SDD) ranged from 0.0034 to 0.0054 g/cm(2).The in vitro long-term precision for direct DXR was comparable to the previous reported short-term in-vitro precision for all tested X-ray systems.

View Article: PubMed Central - PubMed

Affiliation: INM, Rheumatology, Norwegian University of Science and Technology, MTS, 7489 Trondheim, Norway. alvilde.dhainaut@ntnu.no

ABSTRACT

Objective: Digital X-ray radiogrammetry (DXR) calculates peripheral bone mineral density (BMD) from hand radiographs. The short-term precision for direct DXR has been reported to be highly satisfactory. However, long-term precision for this method has not been examined. Thus, the aim of this study was to examine the long-term in-vitro precision for the new direct digital version of DXR.

Materials and methods: The in-vitro precision for direct DXR was tested with cadaver phantoms on four different X-ray systems at baseline, 3 months, 6 months, and in one machine also at 12 months. At each time point, 31 measurements were performed.

Results: The in-vitro longitudinal precision for the four radiographic systems ranged from 0.22 to 0.43% expressed as coefficient of variation (CV%). The smallest detectable difference (SDD) ranged from 0.0034 to 0.0054 g/cm(2).

Conclusions: The in vitro long-term precision for direct DXR was comparable to the previous reported short-term in-vitro precision for all tested X-ray systems. These data show that DXR is a stable method for detecting small changes in bone density during 6-12 months of follow-up.

Show MeSH