Sind mit der Mehrschicht-Computertomografie Dichtemessungen auch bei geringer Schichtdicke und niedrigem Röhrenstrom verlässlich? Ergebnisse einer Phantomstudie

Kirchhof, Klaus; Welzel, Thomas; Wagner, Thomas H.; Behr, W; Bohndorf, Klaus

doi:10.1055/s-2007-963566

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Dies war jedoch bewusst nicht Gegenstand unserer Studie. In einer von Kirchhoff et al publizierten Phantomstudie konnte nachgewiesen werden, dass die Schichtdicke und der Röhrenstrom nur einen geringen Einfluss auf die Dichtemessung hat[13]. In der Studie von Gor et al wurde zusätzlich zur CT die Nachweismöglichkeit intraorbitaler Glassplitter durch Ultraschall und MRT untersucht.…”

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Nachweismöglichkeit intraorbitaler Fremdkörper durch MDCT

Hoffstetter

Friedrich²,

Framme³

et al. 2011

Fortschr Röntgenstr

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Due to its high density of at least 2000 HU, glass is usually easily recognizable as an orbital foreign body. The detection threshold depends on the object's density and size and can be as low as 0.01 mm (3) in the case of glass with strong refraction and thus high density. The detection of glass as an orbital foreign body seems to be secure for slivers with a volume of at least 0.2 mm (3) for all types of glass.

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Nachweismöglichkeit intraorbitaler Fremdkörper durch MDCT

Hoffstetter

Friedrich²,

Framme³

et al. 2011

Fortschr Röntgenstr

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Thrombus Density in Acute Basilar Artery Occlusion Depends on Slice Thickness and the Method of Manual Thrombus Delineation

Shen

Meyne

Jansen

et al. 2022

Life

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Introduction: High thrombus attenuation on CT has been suggested as a predictor of successful recanalization. It is as well speculated that thrombi of different density may be susceptible to different methods of mechanical thrombectomy. In this study we sought to determine the effect of different methods of manual thrombus delineation and reconstructed slice thickness on thrombus density. Material and Methods: Fifty-six patients with acute occlusion of the basilar artery treated with endovascular therapy were retrospectively included. Clinical, demographic, radiological and outcome parameters were collected. Two raters measured absolute and relative thrombus density employing three different methods (one region of interest, three regions of interest, whole thrombus delineation) and using three different reconstructed slice thicknesses (0.625, 2.5 and 5 mm) of the original admission CT. Results: Thirty-nine patients were successfully recanalized (thrombolysis in cerebral infarction score ≥ 2b). Good clinical outcome (modified Rankin scale ≤ 2) occurred significantly more often in the recanalized group (36 vs. 6%, p = 0.023, Fisher’s exact test), in the non-recanalized group symptomatic intracranial hemorrhage occurred more often (9 vs. 29%, p = 0.001, Fisher’s exact test). Absolute and relative thrombus density were largely different between methods and slice thicknesses. Multiple regression showed a decrease of thrombus density with increasing slice thickness (β = −3.98, p < 0.001) and logistic regression showed a statistically significant but very small relation between density and recanalization (β = 0.006, odds ratio (95% confidence interval) = 1.006 (1.003–1.01), p < 0.001). Conclusions: The methods for manual thrombus delineation and reconstructed slice thickness had a significant influence on absolute and relative thrombus density. Density alone may be of limited value as a predictive marker for recanalization success in acute occlusion of the basilar artery. Standards for density measurements must be defined when comparing different studies and when evaluating different methods of mechanical thrombectomy.

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Sind mit der Mehrschicht-Computertomografie Dichtemessungen auch bei geringer Schichtdicke und niedrigem Röhrenstrom verlässlich? Ergebnisse einer Phantomstudie

Abstract: The accuracy of attenuation values as determined by CT with low slice thickness and low tube current with a maximal difference of 4.3 HU suffices for the purposes of clinical routine. A reduction of slice thickness from 1.25 mm to 0.625 mm yields the greatest differences in CT values.

Cited by 2 publications

References 3 publications

Nachweismöglichkeit intraorbitaler Fremdkörper durch MDCT

Nachweismöglichkeit intraorbitaler Fremdkörper durch MDCT

Thrombus Density in Acute Basilar Artery Occlusion Depends on Slice Thickness and the Method of Manual Thrombus Delineation

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