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Qdr 4500a fan beam x ray bone densitometer

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The QDR 4500A is a fan beam x-ray bone densitometer manufactured by Hologic. It is designed to measure bone mineral density and content.

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Lab products found in correlation

Discovery software, by Hologic (2 mentions) Discovery software version 12, by Hologic (1 mentions)

Spelling variants of this product

QDR 4500A (311 citations) QDR-4500A fan-beam densitometer (22 citations) QDR-4500A densitometer (12 citations) Hologic densitometers (9 citations) Bone densitometers (3 citations) QDR-4500A fan- (2 citations) Fan-beam densitometer (2 citations)

5 protocols using qdr 4500a fan beam x ray bone densitometer

1

Spinal Bone Density Measurement

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Bone mineral density (BMD) of the spine (L1-L4) was measured using dual-energy X-ray absorptiometry (Hologic QDR 4500A Fan Beam X-ray Bone Densitometer, Hologic, Bedford, MA, USA). BMD results are presented in z-scores, which were calculated according to age and birth-registered sex appropriate for this device.
Karakılıç Özturan E., Öztürk A.P., Baş F., Erdoğdu A.B., Kaptan S., Kardelen Al A.D., Poyrazoğlu Ş., Yıldız M., Direk N., Yüksel Ş, & Darendeliler F. (2023). Endocrinological Approach to Adolescents with Gender Dysphoria: Experience of a Pediatric Endocrinology Department in a Tertiary Center in Turkey. Journal of Clinical Research in Pediatric Endocrinology, 15(3), 276-284.
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2

Whole-Body DXA Scan Protocol

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Whole-body DXA were performed at the Mobile Examination Center using a Hologic QDR 4500 A fan beam X-ray bone densitometer (Hologic Inc.). Participants were excluded if they had radiographic contrast material tests in the past 72 h or a nuclear medicine test in the past 3 d or if they exceeded selfreported weight over 300 pounds or height over 6'•5''. All DXA scans were reviewed for quality control and analysed using Hologic Discovery software, version 12.1, to derive total and regional body composition including lean body mass, fat mass, percent fat and bone mineral content. Invalid DXA scans were coded as missing in the data files and missing DXA values were imputed using a multiple imputation method. For this study, we used the data for total lean body mass, excluding bone density mineral, total fat mass and total percent fat.
Lee D.H., Keum N., Hu F.B., Orav E.J., Rimm E.B., Sun Q., Willett W.C, & Giovannucci E.L. (2017). Development and validation of anthropometric prediction equations for lean body mass, fat mass and percent fat in adults using the National Health and Nutrition Examination Survey (NHANES) 1999-2006. The British journal of nutrition, 118(10).
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3

Comparison of Waist Circumference Measurement Methods

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WC in the U.S. NHANES was assessed by measuring the uppermost lateral border of the ilium using a flexible tape measure. Whole-body DXA examinations were conducted with a Hologic QDR 4500 A fan beam X-ray bone densitometer (Hologic Inc., Marlborough, MA, USA); furthermore, total and regional body compositions were analyzed with DXA scans. Additional details regarding the sample collection and examination method can be found in the NHANES Laboratory Procedures Manual [24 ].
WC in the KNHANES was assessed by measuring the midpoint of the lowest border of the rib cage and the upper lateral border of the iliac crest at the end of normal expiration. Whole-body DXA examinations were conducted using a QDR Discovery fan beam densitometer (Hologic, Inc., Bedford, MA, USA), and total and regional body compositions were analyzed with DXA scans. Additional details regarding the sample collection and examination method can be found in the guidelines of the KNHANES [25 , 26 ].
Moon S., Kim Y.J., Yu J.M., Kang J.G, & Chung H.S. (2020). Z-score of the log-transformed A Body Shape Index predicts low muscle mass in population with abdominal obesity: The U.S. and Korea National Health and Nutrition Examination Survey. PLoS ONE, 15(11), e0242557.
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4

Bone Densitometry and Body Composition

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Hologic QDR 4500A fan beam x-ray bone densitometer was used (Hologic, Inc., Bedford, Massachusetts) for DXA scans (22 ). Hologic Discovery software (version 12.1, Hologic, Inc.) was used to analyze original scan results and to derive fat mass and lean mass. Body regions, including head, arm, trunk, and leg, were delineated manually using tools provided by the software (see Supplemental Material, Definition of body regions). Missing readings for DXA data were imputed five times using sequential regression multivariate imputation in the SAS-callable software package IVEware (23 ). All five datasets were provided, allowing analysts to incorporate the extra variability due to imputation into analyses (23 ). In the current study, 263 participants had 1 or more missing DXA measurements imputed (with <5% of all data points imputed). Body fat mass percentage (FM%) for the whole body and each region (trunk and legs) was calculated as fat mass divided by total mass times 100.
Zong G., Grandjean P., Wu H, & Sun Q. (2015). Circulating Persistent Organic Pollutants and Body Fat Distribution, Evidence from NHANES 1999-2004. Obesity (Silver Spring, Md.), 23(9), 1903-1910.
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5

Bone Densitometry and Body Composition

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Hologic QDR 4500A fan beam x-ray bone densitometer was used (Hologic, Inc., Bedford, Massachusetts) for DXA scans (22 ). Hologic Discovery software (version 12.1, Hologic, Inc.) was used to analyze original scan results and to derive fat mass and lean mass. Body regions, including head, arm, trunk, and leg, were delineated manually using tools provided by the software (see Supplemental Material, Definition of body regions). Missing readings for DXA data were imputed five times using sequential regression multivariate imputation in the SAS-callable software package IVEware (23 ). All five datasets were provided, allowing analysts to incorporate the extra variability due to imputation into analyses (23 ). In the current study, 263 participants had 1 or more missing DXA measurements imputed (with <5% of all data points imputed). Body fat mass percentage (FM%) for the whole body and each region (trunk and legs) was calculated as fat mass divided by total mass times 100.
Zong G., Grandjean P., Wu H, & Sun Q. (2015). Circulating Persistent Organic Pollutants and Body Fat Distribution, Evidence from NHANES 1999-2004. Obesity (Silver Spring, Md.), 23(9), 1903-1910.
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