Subtle gastric abnormalities in a canine model: detection with low-dose imaging with storage phosphors and its equivalence to conventional radiography
| Autor: | G Cardenosa, H E Mrose, J H Shin, J R Rubens, E Pile-Spellman, Reginald Greene, J. W. Oestmann, K A McCarthy, Deborah A. Hall |
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| Rok vydání: | 1989 |
| Předmět: |
medicine.medical_specialty
Pixel Receiver operating characteristic business.industry Digital imaging Stomach Diseases Edge enhancement In Vitro Techniques Standard deviation Barium meal Radiographic Image Enhancement Digital image Dogs ROC Curve Stomach Neoplasms Medicine Animals Radiology Nuclear Medicine and imaging Radiology Stomach Ulcer business Nuclear medicine Digital radiography |
| Zdroj: | Radiology. 172(2) |
| ISSN: | 0033-8419 |
| Popis: | The authors compared low-dose (32% of standard exposure) storage phosphor digital imaging (system resolution: 0.2-mm pixels, 10 bits) with isovoltage 75-kVp conventional radiography (standard exposure) in the detection of subtle simulated gastric abnormalities by using air contrast barium studies. Subtle simulated abnormalities (3-7-mm polyps, 4-15-mm ulcer craters, 4-11-mm-diameter edema, and 11-12-mm linear ulcers) were produced in resected canine stomachs. Receiver operating characteristic analysis of 1,800 observations by six readers indicated that the digital images with and without high-frequency edge enhancement were equivalent to conventional radiographs (mean receiver operating characteristic areas [+/- standard deviation]: 0.76 +/- 0.06, 0.78 +/- 0.04, and 0.77 +/- 0.04, respectively). The accuracy of the diagnosis was equivalent for all three modalities. The following mean accuracies of negative and positive responses, respectively, for unenhanced digital, edge-enhanced digital, and conventional images were determined: 0.71 +/- 0.05 and 0.41 +/- 0.07, 0.71 +/- 0.04 and 0.51 +/- 0.09, and 0.68 +/- 0.04 and 0.43 +/- 0.05. It was concluded that low-dose storage phosphor air-contrast barium studies were equivalent to conventional radiography in the detection of subtle gastric abnormalities. |
| Databáze: | OpenAIRE |
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