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Pitfalls in urinary stone identification using CT attenuation values: are we getting the same information on

Romain Grosjean¹, Michel Daudon, Mario F Chammas

¹IADI Laboratory, INSERM-U947, Nancy-University, Allée du Morvan, 54500 Vandoeuvre-les-Nancy, France. r.grosjean@chu-nancy.fr

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|April 23, 2013

Summary

Computed Tomography (CT) scanners show significant variability in determining urinary stone composition using CT attenuation values. This study found CT analysis provides insufficient information to reliably identify renal stone types across different scanner models.

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Area of Science:

Radiology
Urology
Medical Imaging

Background:

Urinary stone composition analysis is crucial for effective treatment.
Computed Tomography (CT) is a common imaging modality for urinary stones.
CT attenuation values are used to infer stone composition.

Purpose of the Study:

To evaluate the capability of different CT scanners in determining urinary stone composition.
To assess potential differences in CT attenuation values between various scanner models.

Main Methods:

241 human urinary stones with determined biochemical composition were analyzed.
Four CT scanner brands (Siemens, Philips, GEMS, Toshiba) were evaluated.
Mean CT attenuation values and standard deviations were recorded and compared using a t-paired test.

Main Results:

Large overlaps in CT attenuation values were observed between different stone types across all scanners.
Most stone types could not be reliably identified based on CT attenuation.
Significant differences in mean CT attenuation values were found between scanner models for certain stone types and kV settings.

Conclusions:

There is considerable variability in CT scanner performance for urinary stone composition analysis.
CT scan analysis and Hounsfield Unit (HU) evaluation provide insufficient information for accurate renal stone characterization.
Further research is needed to improve CT-based stone composition identification.