Sensitivity and value of digital CT scout radiography for detecting ureteral stones in patients with ureterolithiasis diagnosed on unenhanced CT
| Autor: | K Anderson, L Scout, Robert C. Smith, Arthur T. Rosenfield, G Chu |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Adult
Male medicine.medical_specialty Ureteral Calculi Radiography Sensitivity and Specificity Imaging phantom Ureter Humans Medicine Radiology Nuclear Medicine and imaging In patient Ureterolithiasis Aged Retrospective Studies Phantoms Imaging business.industry Scout view General Medicine Middle Aged medicine.disease Abdominal Pain Radiographic Image Enhancement medicine.anatomical_structure Female Kidney stones Tomography Radiology Tomography X-Ray Computed business |
| Zdroj: | American Journal of Roentgenology. 173:417-423 |
| ISSN: | 1546-3141 0361-803X |
| DOI: | 10.2214/ajr.173.2.10430147 |
| Popis: | When unenhanced CT reveals ureterolithiasis, some patients will require baseline or follow-up conventional radiography to help guide clinical management. We sought to determine the sensitivity of routinely obtained scout radiographs for revealing stones to determine if the scout view can be used in place of baseline conventional radiography.We retrospectively reviewed the CT scout radiographs in conjunction with axial CT images in a series of 215 consecutive patients in whom CT revealed a single ureteral stone. On the scout radiographs, stones were classified as definitely visible, definitely not visible, or indeterminate. In addition, a phantom was constructed using fragments of kidney stones to evaluate the effect of the digital scout kilovoltage settings on stone visualization.Forty-nine percent of stones were definitely visible on scout radiography, 47% were definitely not visible, and 4% were indeterminate. Four stones larger than 10 mm that were not visible on scout radiography were composed of uric acid (n = 2) or xanthine (n = 2). Scout radiographs of the phantom determined an optimal kilovoltage setting of 80-100 kVp to visualize stones less than 3 mm, whereas stones greater than or equal to 3 mm were visible at all kilovoltage settings.In our series, 49% of ureteral stones were visible on the often-overlooked routine CT scout radiograph. Imaging of phantoms showed that stone visualization can be optimized by using the lowest kilovoltage settings. Therefore, the CT scout view can be used as a baseline study in patients requiring follow-up radiography and for planning treatment of patients requiring lithotripsy or other intervention. Finally, large stones not visible on scout radiographs are likely composed of uric acid or xanthine. |
| Databáze: | OpenAIRE |
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