Journals / Kocatepe Veteriner Dergisi / 2026 / Cilt: 19 Sayı: 2

Projection-Dependent Variability of Intestinal Diameter Measurements Between Right Lateral and Ventrodorsal Abdominal Radiographs in Dogs

Köpeklerde Sağ Lateral ve Ventrodorsal Abdominal Radyografilerde İntestinal Çap Ölçümlerinin Pozisyona Bağlı Farklılıkları

Yalçın Alper Özturan(AYDIN ADNAN MENDERES ÜNİVERSİTESİ, VETERİNER FAKÜLTESİ)0000-0003-0589-5686
İbrahim Akın(AYDIN ADNAN MENDERES ÜNİVERSİTESİ)0000-0002-4387-7115
Pages
126–135
Publication Date
2026-06-15
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

These findings indicate that small intestinal diameter measurements are interchangeable between projections, whereas large intestinal measurements are influenced by patient positioning.

📌 3 Key Takeaways

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Objective & Hypothesis:Abdominal radiography is widely used for evaluating gastrointestinal disease in dogs, and intestinal diameter measurements play a key role in differentiating ileus, obstruction, and colonic distension.
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Key Findings & Data:No significant differences were identified between RL and VD projections for small intestinal diameters (p > .05), and agreement analyses demonstrated minimal bias with narrow limits of agreement, indicating projection independence.
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Conclusion & Impact:These findings indicate that small intestinal diameter measurements are interchangeable between projections, whereas large intestinal measurements are influenced by patient positioning.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Abdominal Radyografi · Gastrointestinal Sistem · Görüntü Yorumlama

Abstract

Abdominal radiography is widely used for evaluating gastrointestinal disease in dogs, and intestinal diameter measurements play a key role in differentiating ileus, obstruction, and colonic distension. This study aimed to determine whether small and large intestinal diameter measurements differ between right lateral (RL) and ventrodorsal (VD) abdominal radiographs in dogs. Thirty-four client-owned dogs presenting with gastrointestinal signs underwent orthogonal abdominal radiography. Minimum, mean, and maximum diameters of the small and large intestines were measured on both projections. Wilcoxon signed-rank test, Bland–Altman analysis and Passing–Bablok regression were used to evaluate differences and agreement between projections. No significant differences were identified between RL and VD projections for small intestinal diameters (p > .05), and agreement analyses demonstrated minimal bias with narrow limits of agreement, indicating projection independence. In contrast, large intestinal diameters were significantly greater on VD projections (p < .05) and showed consistent negative bias on RL views, reflecting predictable projection-dependent variation. Despite this positional effect, linear relationships between projections remained preserved. These findings indicate that small intestinal diameter measurements are interchangeable between projections, whereas large intestinal measurements are influenced by patient positioning. Awareness of projection-related variability may improve interpretation and standardization of abdominal radiographic assessment in dogs with gastrointestinal disease

Özet

Abdominal radyografi, köpeklerde gastrointestinal hastalıkların değerlendirilmesinde yaygın olarak kullanılmakta olup, intestinal çap ölçümleri ileus, obstrüksiyon ve kolon dilatasyonunun ayırt edilmesinde temel bir rol oynamaktadır. Bu çalışmanın amacı, aynı köpeklerden elde edilen sağ lateral (RL) ve ventrodorsal (VD) abdominal radyografiler arasında ince ve kalın bağırsak çap ölçümlerinin farklılık gösterip göstermediğini belirlemektir. Gastrointestinal belirtilerle başvuran 34 sahipli köpeğe ortogonal abdominal radyografiler alındı. İnce ve kalın bağırsakların minimum, ortalama ve maksimum çapları her iki radyografik pozisyonda ölçüldü. Radyografik pozisyonlar arasındaki fark ve uyumu değerlendirmek amacıyla Wilcoxon işaretli sıralama testi, Bland–Altman analizi ve Passing–Bablok regresyonu kullanıldı. İnce bağırsak çapları açısından RL ve VD radyografik pozisyonlar arasında anlamlı fark saptanmadı (p > ,05) ve uyum analizleri, pozisyondan bağımsızlığı gösteren minimal yanlılık ve dar uyum sınırları bulundu. Buna karşılık, kalın bağırsak çapları VD radyografik pozisyonda anlamlı derecede daha yüksek bulundu (p < ,05) ve RL görüntülerde tutarlı negatif yanlılık gösterdi; bu durum öngörülebilir pozisyona bağlı varyasyonu yansıtmaktadır. Bu pozisyonel etkiye rağmen, radyografik pozisyonlar arasındaki doğrusal ilişkiler korunmuştur. Bu bulgular, ince bağırsak çap ölçümlerinin radyografik pozisyonlar arasında birbirinin yerine kullanılabilir olduğunu, ancak kalın bağırsak ölçümlerinin hasta pozisyonundan etkilendiğini göstermektedir. Radyografik pozisyona bağlı değişkenliğin farkında olunması, gastrointestinal hastalığı bulunan köpeklerde abdominal radyografik değerlendirmelerin yorumlanmasını ve standardizasyonunu iyileştirebilir.

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Cite This Article

Özturan, Y. A., Akın, İ. (2026). Projection-Dependent Variability of Intestinal Diameter Measurements Between Right Lateral and Ventrodorsal Abdominal Radiographs in Dogs. Kocatepe Veteriner Dergisi, Cilt: 19 Sayı: 2, 126–135. https://doi.org/10.30607/kvj.1898417

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