In Vivo Evaluation of The Chemical Composition of Urinary Stones Using Non-Contrast Helical Computerized Tomography

Year 2023, , 38 - 45, 31.05.2023

Osman Raif Karabacak , Fatih Sandıkçı , Hakan Saltaş , Alper Dilli , Kürşad Zengin , Fatih Yalçınkaya , Ümit Yaşar Ayaz

https://doi.org/10.54233/endouroloji.20231502-1224856

Abstract

Objective: To determine the density and chemical structure of renal stones by using in vivo low dose helical
computerized tomography (CT).

Material and Methods: 79 patients with urinary stones such as renal or uretheral stones were included in
our study who were going to have extracorporeal shock wave lithotripsy (ESWL) or planned to go through
urinary stone surgery due to renal stones. All stone densities were measured in Hounsfield Unit by low dose
abdominal non-contrast helical computed tomography examination. Marconi MX 8000 CT system with 4
detectors was used for the CT examination. X-Ray diffractometry was used in the analyses of all stones.

Results: The stone type was found to be pure type in 52 patients, and mixed stone in 27 patients. The largest
group among the mixed stones included whewellite stone with 17 patients. Uric acid stones had the
smallest, whewellite stones had the highest density. The difference between the density values of uric acid
and cystine stones and the other stone types were statistically significant.

Conclusion: Non-contrast helical computed tomography used in the diagnosis can also be used in the in
vivo determination of the stone composition. It can be very helpful to define stone compositions by imaging
studies to provide suitable therapeutic alternatives.

Keywords

Stone, density, tomography, dual, hounsfield unit

İdrar Taşlarının Kimyasal Bileşiminin Kontrastsız Helikal Bilgisayarlı Tomografi ile In Vivo Değerlendirilmesi

Abstract

Amaç: Düşük doz helikal bilgisayarlı tomografi kullanılarak böbrek taşlarının yoğunluğunun ve kimyasal
yapısının belirlenmesi.
Gereç ve Yöntemler: Çalışmamıza; böbrek taşı nedeniyle ekstrakorporeal şok dalga litotripsisi (ESWL) yapılacak
veya üriner sistem taş cerrahisi geçirmesi planlanan, böbrek veya üreter taşı olan 79 hasta dahil
edildi. Tüm taş yoğunlukları, Hounsfield Ünite olarak düşük doz abdominal kontrastsız helikal bilgisayarlı
tomografi incelemesi ile ölçüldü. Bilgisayarlı tomografi incelemesi için 4 dedektörlü Marconi MX 8000 sistemi
kullanıldı. Tüm taşların analizlerinde X-Ray difraktometri kullanıldı.
Bulgular: Taş tipi 52 hastada tek tip ve 27 hastada mikst taş olarak bulundu. Karışık taşlar içinde en büyük
grubu, 17 hasta ile kalsiyum oksalat monohidrat-dihidrat taşları oluşturdu. Ürik asit taşları en düşük, kalsiyum
oksalat monohidrat taşları en yüksek yoğunluğa sahip olarak bulundu. Ürik asit ve sistin taşlarının
dansite değerleri ile diğer taş çeşitleri arasındaki fark istatistiksel olarak anlamlıydı.
Sonuç: Teşhiste kullanılan kontrastsız helikal bilgisayarlı tomografi, taş kompozisyonunun in vivo tayininde
de kullanılabilir. Uygun terapötik alternatifler sağlamak için görüntüleme çalışmaları ile taş kompozisyonlarını
tanımlamak çok yardımcı olabilir.

Keywords

Stone, density, tomography, dual, hounsfield unit

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