Journals / Türk Üroloji Dergisi/Turkish Journal of Urology / 2006 / Cilt: 32 - Sayı: 1

The diagnostic value of the acoustic shadow of the renal stones: Multidedector CT as a reference standard

Böbrek taşlarında akustik gölgenin tanısal değeri: Çok dedektörlü BT referans alınarak değerlendirme

Pages
84–89
DOI
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Conclusion: This study found a strong correlation between presence of acoustic shadow on US examination and, size and density of renal stones on non-contrast CT examination.

📌 3 Key Takeaways

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Objective & Hypothesis:Introduction: In this study, we aimed to investigate the relationships between sonographic acoustic shadow and density and, size of renal calculi with multidetector CT as the reference standard.
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Key Findings & Data:Cohen’s Kappa test was used to assess interobserver variability.
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Conclusion & Impact:Conclusion: This study found a strong correlation between presence of acoustic shadow on US examination and, size and density of renal stones on non-contrast CT examination.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Tanı · Tomografi · x-ışınlı bilgisayarlı

Abstract

Introduction: In this study, we aimed to investigate the relationships between sonographic acoustic shadow and density and, size of renal calculi with multidetector CT as the reference standard. Materials and Methods: Fifty patients with suspected renal stone disease were prospectively examined. Two staff radiologists performed real time sonography and were blinded to each other and two other radiologists evaluated the CT images. For both imaging modality diagnosis of nephrolithiasis were made by certain criteria. Cohen&#8217;s Kappa test was used to assess interobserver variability. Spearman&#8217;s rho analysis and chi-square tests were used to assess the relationship between the density and size of the renal stones on noncontrast CT and acoustic shadow on US examination. Results: Eighty seven renal stones were identified in 36 (72%) of all patients on non-contrast CT. Of the 87 stones, the first radiologist diagnosed only 36 stones (41.3%), whereas the second radiologist diagnosed 41 (47.1) stones on US. Strong correlation was found between the density and size of the renal stones on noncontrast CT images (p<0.001). Stones larger than 3 mm in diameter and denser than 300 HU on non-contrast CT had acoustic shadows on US examination. Conclusion: This study found a strong correlation between presence of acoustic shadow on US examination and, size and density of renal stones on non-contrast CT examination.

Özet

Ultrasonda görünen böbrek taşlarına ait akustik gölgelerin, taşların boyut ve yoğunluğu ile ilgisinin olup olmadığı araştırılmıştır. Referans tetkik olarak kontrastsız BT kullanılmıştır. İleriye dönük olarak yapılan çalışmamızda, böbrek taşı şüphesi bulunan 50 hastamızın her iki böbreği, birbirinden habersiz iki radyoloji uzmanı tarafından US ile değerlendirilmiştir. Her iki radyolog arasındaki uyumu belirlemek için Kappa testi uygulanmıştır. Taşların US’deki akustik gölgesi ile BT’deki boyut ve yoğunluğu arasındaki ilişki ise, Spearman korelasyon analizi ve ki-kare istatistik testleri ile araştırılmıştır. Çalışmamıza dahil olan 50 hastanın 36’sında (%72), kontrastsız BT’de 87 adet taş bulunmuş olup US’de bunların 36’si (%41) birinci, 41’i (%47) ise ikinci radyoloji uzmanı tarafından doğru değerlendirilmiştir. Kontrastsız BT’de ölçülen 3 mm’den büyük ve 300 HU’den yoğun taşların US’ de akustik gölge oluşturduğu gözlenmiştir. Taşın kontrastsız BT’deki yoğunluğunun, boyutu ile doğru orantılı olarak arttığı saptanmıştır (p<0,001). Her iki radyoloji uzmanının bulgularının birbirleri ile uyumlu olduğu gözlenmiştir (sağ böbrek için κ:0.590, sol böbrek için κ:0.624). Ultrasonda akustik gölgenin görülüp görülmemesi ile taşın kontrastsız BT’deki boyut ve yoğunluğu arasında güçlü istatistiksel ilişki saptanmıştır (p<0,001).

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Cite This Article

ULUSAN, Ş., KOÇ, Z., HÜCRAN, C., TERCAN, F., GÜVEL, S. (2006). The diagnostic value of the acoustic shadow of the renal stones: Multidedector CT as a reference standard. Türk Üroloji Dergisi/Turkish Journal of Urology, Cilt: 32 - Sayı: 1, 84–89. https://ajindex.com/articles/72121

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