title: In vivo comparison of 3D ultrasonography and magnetic resonance imaging in volume estimation of human kidneys.
abstract: The objective of this study was to evaluate the accuracy of a three-dimensional ultrasound system (3D-US) compared with Magnetic Resonance Imaging (MRI) in volume estimation of human kidneys in vivo. Twenty healthy volunteers were scanned fasting in supine position with MRI and with a 3D-US. An ultrasound sector scanner with a mechanical transducer coupled to a tilting motor provided images of multiple sections of kidneys. A 3.25-MHz transducer was tilted through 88 degrees yielding 81 frames, and volume estimation was performed on a Unix workstation after manual contour indication. Data acquisition with MRI was performed by using a 1-T magnet. Eighteen included kidneys [mean +/- standard deviation (SD)] measured 155.7 +/- 26.4 mL (range 110.0-205.0 mL) by 3D ultrasound and 171.8 +/- 24.6 mL (range 127.5-211.0 mL) by MRI, yielding a good correlation (r = 0.82, p < 0.001) between the two methods. The mean difference was -16.1 +/- 15.6 mL (SD) and the limits of agreement were -49.0 mL. We conclude that this 3D-US is accurate in volume estimation of human kidneys in vivo.
authors.affiliation: Medical Department A, Haukeland Hospital, University of Bergen, Norway.
authors.forename: O H
authors.initials: OH
authors.lastname: Gilja
authors.forename: A I
authors.initials: AI
authors.lastname: Smievoll
authors.forename: N
authors.initials: N
authors.lastname: Thune
authors.forename: K
authors.initials: K
authors.lastname: Matre
authors.forename: T
authors.initials: T
authors.lastname: Hausken
authors.forename: S
authors.initials: S
authors.lastname: Odegaard
authors.forename: A
authors.initials: A
authors.lastname: Berstad
mesh_terms: D000328:Adult; D003626:Data Display; D005215:Fasting; D005260:Female; D006801:Humans; D007668:Kidney / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000706:statistics & numerical data; D008297:Male; D012044:Regression Analysis; D012815:Signal Processing, Computer-Assisted; D016683:Supine Position; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation / Q000706:statistics & numerical data