Produção Nacional
Revisado por pares
Computed tomography window affects kidney stones measurements
2019; Sociedade Brasileira de Urologia; Volume: 45; Issue: 5 Linguagem: Inglês
10.1590/s1677-5538.ibju.2018.0819
ISSN1677-6119
AutoresAlexandre Danilovic, Bruno Aragão Rocha, Giovanni Scala Marchini, Olivier Traxer, Carlos Batagello, Fábio C. Vicentini, Fábio César Miranda Torricelli, Miguel Srougi, William Carlos Nahas, Eduardo Mazzucchi,
Tópico(s)Radiation Dose and Imaging
ResumoObjectives Measurements of stone features may vary according to the non-contrast computed tomography (NCCT) technique. Using magnified bone window is the most accurate method to measure urinary stones. Possible differences between stone measurements in different NCCT windows have not been evaluated in stones located in the kidney. The aim of this study is to compare measurements of kidney stone features between NCCT bone and soft tissue windows in patients submitted to retrograde intrarenal surgery (RIRS). Materials and Methods Preoperative and 90th postoperative day NCCT were performed in 92 consecutive symptomatic adult patients (115 renal units) with kidney stones between 5 mm to 20 mm (< 15 mm in the lower calyx) treated by RIRS. NCCT were evaluated in the magnified bone window and soft tissue window in three axes in a different time by a single radiologist blinded for the measurements of the NCCT other method. Results Stone largest size (7.92±3.81 vs. 9.13±4.08; mm), volume (435.5±472.7 vs. 683.1±665.0; mm3) and density (989.4±330.2 vs. 893.0±324.6; HU) differed between bone and soft-tissue windows, respectively (p 2 mm on soft tissue window to 0-2 mm on bone window. Conclusion Kidney stone measurements vary according to NCCT window. Measurements in soft tissue window NCCT of stone diameter and volume are larger and stone density is lesser than in bone window. These differences may have impact on clinical decisions.
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