Diagnostic value of colour Doppler twinkling artefact in sites negative for stones on B mode renal sonography |
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Authors: | Alberto Turrin Paolo Minola Fortunato Costa Luciana Cerati Simeone Andrulli Alberto Trinchieri |
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Institution: | (1) Departments of Radiology, Laboratory, Nephrology and Urology, Lecco Hospital, Lecco, Italy;(2) Department of Radiology, Ospedale Umberto I, via Carlo Alberto 25, Bellano (Lecco), 23800, Italy;(3) Department of Radiology, Ospedale A. Manzoni, via dell’Eremo 9/11, Lecco, 23800, Italy;(4) Department of Laboratory, Ospedale A. Manzoni, via dell’Eremo 9/11, Lecco, 23800, Italy;(5) Department of Nephrology, Ospedale A. Manzoni, via dell’Eremo 9/11, Lecco, 23800, Italy;(6) Department of Urology, Ospedale A. Manzoni, via dell’Eremo 9/11, Lecco, 23800, Italy |
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Abstract: | The aim of the study was to investigate the diagnostic value of the colour Doppler twinkling artefact (TA) in renal stone
disease. To enhance the evidence of TA, a preliminary in vitro study was performed to optimise the setting of colour Doppler
sonography. In the in vitro study, an oxen kidney was examined using an high-frequency (12.5 MHz) linear array probe in a
water bath before and after the inoculation of an aliquot of powder obtained by fragmentation of a calcium oxalate stone.
In the clinical study, 67 patients with diagnosis of urinary stone based on B-mode sonography and 67 matched control subjects
were examined with colour Doppler sonography using a low-frequency (2.5 MHz) curvilinear phased array probe. In vitro, the
injection of calcium oxalate powder in a bovine kidney sample induced the appearance of spots without any back shadowing appearance
on B mode but with a large number of TA on colour Doppler. In vivo, TA was much more frequent in patients with stone disease
(95.5%) compared to controls (9.0%) (P < 0.001). TA was highly associated to renal stone disease and was also present in renal areas where a stone was undetected
with B mode approach suggesting its diagnostic role although further studies are needed to confirm its accuracy. The type
of instrumentation and its setting is crucial to obtain reproducible results. |
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Keywords: | Twinkling artifact Urinary calculi B mode Colour Doppler Sonography |
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