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Title of Journal: Radiol med

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Abbravation: La radiologia medica

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Springer Milan

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DOI

10.1016/0039-6028(72)90278-6

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1826-6983

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Intraobserver and interobserver variability in the

Authors: G Petralia L Bonello P Summers L Preda A Malasevschi S Raimondi R Di Filippi M Locatelli G Curigliano G Renne M Bellomi
Publish Date: 2011/01/12
Volume: 116, Issue: 3, Pages: 466-476
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Abstract

Twentyeight patients with solid breast lesions 10 mm underwent conventional contrastenhanced magnetic resonance imaging MRI and diffusionweighted MRI DWMRI Two observers expert and trainee segmented the lesion from the surrounding breast tissue on DW images with high bvalue 1000 s/mm2 This analysis was repeated by the expert reader after 6 months Volumes were analysed to obtain mean median and standard deviation SD of the ADC values Interobserver and intraobserver variation was analysed using the BlandAltman graphAll lesions were breast carcinomas with a mean ADC value of 107 × 10−3 mm2/s The mean of the differences was 0012 × 10−3 mm2/s corresponding to an intraobserver variability of 11 limits of agreement −5/+8 The mean interobserver difference was 0022 × 10−3 mm2/s corresponding to an interobserver variability of 2 limits of agreement −9/+14Ventotto pazienti con lesioni mammarie solide 10 mm sono state sottoposte a risonanza magnetica RM convenzionale con mezzo di contrasto e a RM pesata in diffusione RMDW Due osservatori hanno isolato la lesione dal tessuto mammario circostante nelle sequenze con elevata pesatura in diffusione bvalue=1000 s/mm2 tale analisi è stata ripetuta da un osservatore dopo 6 mesi Per i volumi ottenuti sono state calcolate media mediana e deviazione standard dell’ADC La variabilità intraosservatore e la variabilità interosservatore sono state valutate tramite il metodo di Bland e AltmanTutte le lesioni sono risultate CM con un valore medio di ADC di 107×10−3 mm2/s è stata calcolata una media delle differenze di 0012×10−3 mm2/s corrispondente ad una variabilità intraosservatore di 11 limiti di accordo −5/+8 È stata calcolata una media delle differenze di 0022×10−3 mm2/s corrispondente ad una variabilità interosservatore di 2 limiti di accordo di −9/+14


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