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Titolo:
REPRODUCIBILITY OF FAT AREA MEASUREMENTS IN YOUNG, NONOBESE SUBJECTS BY COMPUTERIZED ANALYSIS OF MAGNETIC-RESONANCE IMAGES
Autore:
ELBERS JMH; HAUMANN G; ASSCHEMAN H; SEIDELL JC; GOOREN LJG;
Indirizzi:
FREE UNIV AMSTERDAM HOSP,DIV ENDOCRINOL ANDROL,POB 7057 NL-1007 MB AMSTERDAM NETHERLANDS NATL INST PUBL HLTH & ENVIRONM PROTECT,DEPT CHRON DIS & ENVIRONM EPIDEMIOL NL-3720 BA BILTHOVEN NETHERLANDS
Titolo Testata:
International journal of obesity
fascicolo: 12, volume: 21, anno: 1997,
pagine: 1121 - 1129
SICI:
0307-0565(1997)21:12<1121:ROFAMI>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADIPOSE-TISSUE DISTRIBUTION; BODY-FAT; CARDIOVASCULAR-DISEASE; ABDOMINAL FAT; VISCERAL FAT; MR IMAGES; WOMEN; TOMOGRAPHY; QUANTIFICATION; RISK;
Keywords:
FAT AREA MEASUREMENTS; MAGNETIC RESONANCE IMAGING; REPRODUCIBILITY, INTEROBSERVER VARIABILITY AND INTRAOBSERVER VARIABILITY;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
J.M.H. Elbers et al., "REPRODUCIBILITY OF FAT AREA MEASUREMENTS IN YOUNG, NONOBESE SUBJECTS BY COMPUTERIZED ANALYSIS OF MAGNETIC-RESONANCE IMAGES", International journal of obesity, 21(12), 1997, pp. 1121-1129

Abstract

OBJECTIVES: To assess reproducibility, expressed as both inter-observer variability and intra-observer variability, of fat area measurements on images obtained by magnetic resonance (MR); to compare variability between fat area measurements, calculated from a single image per body region and from the average fat area of three images, and to determine reproducibility of image acquisition at the abdominal level. SUBJECTS: Thirty young, non-obese subjects (reproducibility of image analysis) and nine young, non-obese subjects (reproducibility of image acquisition). METHODS: Three MK images at the level of the abdomen (in 30 subjects) and at the level of the hip and thigh (in 14 of them). Quantification of subcutaneous fat depots (abdomen, hip and thigh) and visceral fat depots using an image-analyzing computer program. Assessment of variability of image analysis for fat area measurements between two observers and within observers. Assessment of reproducibility of imageacquisition at the abdominal level (in nine subjects). RESULTS: Subcutaneous fat areas in all body regions were quantified with coefficients of variation (CV) ranging from only 2.1%-4.9%. By contrast, visceralfat area measurements showed markedly higher CVs (range: 9.4%-17.6%). Moreover, relative variability was much larger in small visceral fat areas (CVs up to 25.6%). The majority of CVs, calculated for intra-observer variability and calculated from the average fat area measurements of three images, was lower than calculated for inter-observer variability and for one single image, respectively. In particular, for the visceral fat depot, this reduction in variability had practical consequences for the number of subjects required for a study. Variation of repeated image acquisition was in the same range as variation of repeated measurements on the same image. CONCLUSION: One image per body site is sufficient to obtain a reliable estimate of subcutaneous fat depots. For estimations of the visceral fat depot, the average area measurements of three images reduces variability and increases statistical power. The availability of one single experienced observer during a studyadds to accuracy.

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Documento generato il 04/12/20 alle ore 22:15:21