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The comparative survey of Hounsfield units of stone composition in urolithiasis patients.

Shahnani PS, Karami M, Astane B, Janghorbani M - J Res Med Sci (2014)

Bottom Line: Primitive statistical findings showed an effect of size on the HU.To avoid confounding bias, Hounsfield Density (HD: HU/largest transverse diameter) was calculated.No non-calcium stone had HU more than 448 and HD greater than 50 HU/mm.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Isfahan University of Medical Sciences, Isfahan, Iran.

ABSTRACT

Background: Non-contrast computed tomography (NCCT) is the diagnostic choice for renal stone disease. Knowing the composition of a stone before passage can help to choose a better management. We sought to determine whether the Hounsfield unit (HU) measured by NCCT can predict the composition.

Materials and methods: 180 urinary stones from patients seen at Shariati, Kashani and Alzahra CT centers, were submitted to stone analysis, 2012. All scans had been interpreted for HU. Primitive statistical findings showed an effect of size on the HU. To avoid confounding bias, Hounsfield Density (HD: HU/largest transverse diameter) was calculated. Statistical comparisons were performed between composition with HU and HD.

Results: Calcium stones had specific ranges for HD and HU. No non-calcium stone had HU more than 448 and HD greater than 50 HU/mm.

Conclusion: NCCT can differentiate just Calcium from non-calcium stones.

No MeSH data available.


Related in: MedlinePlus

Receiver operating characteristic curve for Hounsfield density of calcium oxalate. Vertical axis is sensitivity and horizontal axis is (1-specifisity). Source of the curve: Reference line is dot-line
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Figure 1: Receiver operating characteristic curve for Hounsfield density of calcium oxalate. Vertical axis is sensitivity and horizontal axis is (1-specifisity). Source of the curve: Reference line is dot-line

Mentions: Of the 180 “pure” and “near pure” stones, 127 were calcium oxalate, 20 were calcium phosphate, 15 were uric acid, 12 were struvite and 6 were cystine. Results of data processing are summarized as the following Table 1 and Figures 1–5. After analysis with SPSS (ANOVA, and ROC curves) we obtained these findings:


The comparative survey of Hounsfield units of stone composition in urolithiasis patients.

Shahnani PS, Karami M, Astane B, Janghorbani M - J Res Med Sci (2014)

Receiver operating characteristic curve for Hounsfield density of calcium oxalate. Vertical axis is sensitivity and horizontal axis is (1-specifisity). Source of the curve: Reference line is dot-line
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4214025&req=5

Figure 1: Receiver operating characteristic curve for Hounsfield density of calcium oxalate. Vertical axis is sensitivity and horizontal axis is (1-specifisity). Source of the curve: Reference line is dot-line
Mentions: Of the 180 “pure” and “near pure” stones, 127 were calcium oxalate, 20 were calcium phosphate, 15 were uric acid, 12 were struvite and 6 were cystine. Results of data processing are summarized as the following Table 1 and Figures 1–5. After analysis with SPSS (ANOVA, and ROC curves) we obtained these findings:

Bottom Line: Primitive statistical findings showed an effect of size on the HU.To avoid confounding bias, Hounsfield Density (HD: HU/largest transverse diameter) was calculated.No non-calcium stone had HU more than 448 and HD greater than 50 HU/mm.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiology, Isfahan University of Medical Sciences, Isfahan, Iran.

ABSTRACT

Background: Non-contrast computed tomography (NCCT) is the diagnostic choice for renal stone disease. Knowing the composition of a stone before passage can help to choose a better management. We sought to determine whether the Hounsfield unit (HU) measured by NCCT can predict the composition.

Materials and methods: 180 urinary stones from patients seen at Shariati, Kashani and Alzahra CT centers, were submitted to stone analysis, 2012. All scans had been interpreted for HU. Primitive statistical findings showed an effect of size on the HU. To avoid confounding bias, Hounsfield Density (HD: HU/largest transverse diameter) was calculated. Statistical comparisons were performed between composition with HU and HD.

Results: Calcium stones had specific ranges for HD and HU. No non-calcium stone had HU more than 448 and HD greater than 50 HU/mm.

Conclusion: NCCT can differentiate just Calcium from non-calcium stones.

No MeSH data available.


Related in: MedlinePlus